Title:
Method and equipment for pumping oil
United States Patent 2046769


Abstract:
My invention relates to apparatus for pumping oil from wells in which a fluid operated pump is employed. It is an object of my invention to provide a a pumping apparatus which will operate with maximum economy for any given lift and which will operate with a minimum of wear In the moving pump...



Inventors:
Coberly, Clarence J.
Application Number:
US65443033A
Publication Date:
07/07/1936
Filing Date:
01/31/1933
Assignee:
KOBE INC
Primary Class:
Other Classes:
166/64, 166/68.5, 166/369
International Classes:
F04F5/02
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Description:

My invention relates to apparatus for pumping oil from wells in which a fluid operated pump is employed.

It is an object of my invention to provide a a pumping apparatus which will operate with maximum economy for any given lift and which will operate with a minimum of wear In the moving pump parts. It is recognized that the long used system of pumping wells by use of reciprocating pumps operated by strings of sucker rods is very uneconomical due to the elongation and contraction of the sucker rod string during the up and down strokes thereof. In my present invention I employ a fluid operated deep well pump of the character disclosed in the patent to Ira B. Humphreys, No. 1,577,971, Issued March 23, 1926, thereby avoiding the use of sucker rods and in this way materially reducing the power required for the pumping operation. In fluid operated pumps of this character the pumping piston or plunger is operated by a fluid actuated motor, such as a reciprocating member having a piston therein which is moved by the pressure of fluid delivered to the fluid operated pump from the top of the well through an individual pipe or conduit.

My present invention has for its object to provide a pumping equipment of the above general character having a simple and economical means whereby the production of a well is conducted to a suitable storage tank or other means of disposal, and a portion of this oil pumped from the well is diverted through a simple, automatically operating filter means to a pressure pump which feeds the filtered oil to the fluid operated pump in the well. In my present invention the filtered oil for operation of the fluid operated pump is obtained with a minimum expenditure of power, and the quantity of oil filtered is automatically controlled in accordance with requirements of the pumping operation. In my present invention the use of filtered oil as a motivating medium for the fluid operated pump maintains the wear on the moving parts of the pump at a minimum and also minimizes the wear on the cylinder and piston of the pressure pump for forcing the filtered oil down the well to the fluid actuated pump.

It is accordingly an object of my invention to provide an apparatus and method for pumping a well in which a portion of the oil issuing from the production pipe leading upwardly from the pump is diverted at the top of the well and is employed for motivation of the fluid operated pump. It is a feature of the invention that the diverted portion of the oil, which contains sand or other abrasive material, is cleaned or filtered so that the wear on the parts of the fluid operated pump engaged by the motivating oil will be maintained at a minimum. The invention is of particular value where it employs a liquid operated pump such as disclosed in the copending application of Clarence J. Coberly, Serial No. 623,171, filed July 18, 1932, in which the motivating oil washes the moving parts of the motor element and also the piston and cylinder of the pumping element embodied in such liquid operated pump. The invention accordingly requires no outside supply of clean oil for the operation of the pump in the well, but makes use of a portion of the oil issuing from the production pipe of the well, this portion of oil, however, being cleaned and being employed to wash the principal moving parts of the pump so that the wear thereon will be maintained at a minimum.

In addition to the foregoing, it is to be noted that the required supply of clean oil for motivating and washing purposes is obtained at substantially no cost due to the automatic and selfcontrolled operation of the filtering device forming part of the invention.

Further objects and advantages of the invention will be made evident throughout the following part of the specification.

Referring to the drawings, which are for illustrative purposes only, Fig. 1 is a vertically sectioned schematic view showing a combination of parts whereby my invention may be practiced.

Fig. 2 is a cross section on a plane represented by the line 2-2 of Fig. 1.

Fig. 3 is a cross section on a plane represented by the line 3-3 of Fig. 1.

Fig. 4 is a cross section on a plane represented by the line 4-4 of Fig. 1.

In the form of the invention disclosed in the drawings, a fluid operated pump II is employed in an oil well 12, such pump being actuated by fluid under pressure delivered through a vertical pipe 13 called the "macaroni", which extends downwardly from a head 14 placed at the top of the well 12 and is preferably situated within a production pipe or oil tube 15. The macaroni 13 is connected to a pressure pump 16 by surface piping 17 which may have a valve 18 therein. The production pipe 15 has its upper end secured to a fitting 20 of the casinghead 21 with which the well 12 is equipped, this fitting having an outlet 22 from which piping 23 extends to an oil receptacle 24 forming a part of a filtering device 25.

The filtering device 25 is shown with a cylindrical shell 31 placed in upright position and having its upper and lower ends closed by end members 32 and 33 and being divided by an intermediate wall 34 into lower and upper chambers 35 and 36, the lower chamber 35 constituting the oil receptacle 24 in which the natural or dirty oil from the production pipe 15 of the well 12 is received, and from which receptacle such oil is transferred to other receivers or containers, as will be hereinafter described.

In the shell 31 above the dividing wall 34 an opening 37 is formed having a sealing ring 38 mounted therein to receive the leftward end 40 of a horizontal pipe 41 which is connected to the discharge end 42 of a centrifugal pump 43 having an impeller 44 therein adapted to drive fluid leftwardly through the pump passages 45.

The inlet end of the pump is connected to a supporting member 46 of cylindrical form having openings 47 therein communicating with the interior of the chamber 36. The supporting member 46 extends through an opening 48 in the wall of the shell 31 diametrally opposite the opening 37 and through a saddle fitting 50, to be welded to a cover plate 51 adapted to be bolted to the flange 52 of the fitting 50. The plate 51, the supporting member 46, the pump 43, and the pipe 41 form a simple unit which may be removed from the chamber 36 by detaching the plate 51 from the fitting 50, whereupon the leftward end 40 of the pipe 41 may be pulled from engagement with the ring 38 surrounding the opening 37. From the impeller 44 a shaft 53 extends through a packing means 54 to an electric motor 55 secured to the outer face of the plate 51 by bracket members 56.

.3 The packing means 54 is of the ordinary type in which a packing material is compressed around the shaft 53 by use of a gland 57.

A metal wall 58, bent to U-shaped cross section as shown in Fig. 2, is secured by welds 60 to the exterior of the shell 31 to provide a vertical passage 61 connecting at its upper end with the opening 37 and the end 40 of the pipe 41, and having its lower end communicating with the lower part of the primary chamber 35 through an opening 63 in the shell 31. The lower end of the wall member 58 is closed by a horizontal plate 64 preferably secured in place by welding, and the upper end of the wall member 58 is provided with a heavy metal ring 65 to which a cover plate 66 may be detachably secured by use of studs or screws 67. A short distance below the opening 37, the vertical passage 61 is intercepted by a horizontally disposed dividing wall 68 having an opening 70 therethrough smaller than the opening 71 of the ring 65 at the upper end'of the wall member 58. A ring member 72 is seated in the opening 70 and has a radial flange 73 which engages the upper face of the dividing wall 68. The ring 72 forms part of a filter element 69 which includes a perforate tube 74 extending downwardly from the ring 72, having its lower end closed by a wall 74a, and having a layer of filter cloth or equivalent material 75 secured thereon by use of a spirally overlapped wire 76. The upper part of the ring 72 is equipped with a diametrally extending bar or spider 77 adapted to be engaged by the lower end of a screw 78 which threads through the cover plate 66 and has the upwardly projecting nut end 80 thereof sealed by means of a threaded cap 81 adapted to be screwed tightly down against a gasket 82 placed around the upwardly projecting part of the screw adjacent the outer face of the cover plate 66.

The filter element is in the.form of a removable cartridge of a size to pass through the opening 71 of the ring 65 at the upper end of the passage 61. The pressure of the screw 78 serves to tightly seal the flange 73 of the filter element against the upper face of the dividing wall 68 and in such position that the interior of the tubular member 74 communicates, through the space 83 within the wall member 58 above the dividing wall member 68, with the leftward end 40 of the pipe 4 I, and the exterior of the filter member communicates through the space 84 below the dividing wall 68 with the opening 63 leading into the primary chamber 35.

Within the shell 31 an overflow or outlet pipe 86 extends from the chamber 35 through the wall 34 and through the chamber 36 to a vertical opening 87 in a fitting 88 secured preferably centrally upon the upper end wall 32, the wall 34 being sealed around the pipe 86 by simple means, such as a weld 90. The fitting 88 has a body portion 91 with a horizontal flange 92 at its upper end to which a plate 93 may be bolted.

Adjacent the opening 87 to which the pipe 86 connects, a vertical passage 94 is formed through the body 91 of the fitting 88. A vertical pipe 96 is disposed in the upper chamber 36 in a position to connect with the lower end of the passage 94, and openings 97 and 98 are provided in the plate 93 in positions to respectively connect to the opening 87 and the passage 94. Welded to the upper face of the plate 93 is a pipe 100 of such diameter 80 that stand pipes 101 and 102 may be extended upwardly therein from the openings 97 and 98 of the plate 93. The fitting 88 is also provided with a discharge outlet 103 which communicates through an opening 104 with the interior of the 85 lower end of the pipe 100. The outlet passage 103 provided by the fitting 88 may be connected to a pipe 112 with other oil transfer pipes, or the pipe 12 may be 'directly led to a storage tank 110. The oil entering the chamber 35 from the40 production pipe 23, as indicated by the arrow 113, will form a level 114 therein above the lower end 115 of the pipe 86, trapping gas in the space 116 above the oil level 114. As the delivery of oil into the chamber 35 continues, a part of the incoming oil will pass upwardly within the pipe 86 and within the space 84 surrounding the filter element, and as the pressure in the chamber 35 increases, oil will be forced upwardly through the pipe 86 and the stand pipe 101 which connects50 with the upper end thereof, the overflow from the stand pipe 101 passing downwardly within the enclosing pipe 100 and thence outwardly through the discharge passage 103 into the pipe 112. At the same timethe difference in pressure existing between the chambers 35 and 36 will cause oil to flow through the filter element 69 and thence, as indicated by arrows 117 and 118, through the horizontal pipe 41, through the passages 45 and the impeller 44 of the pump, and through the openings 47 in the supporting member 46, into the lower part of the chamber 36 wherein the filtered oil will accumulate until the level 120 thereof reaches a plane above the lower end 121 of the pipe 96. The filtered oil may be withdrawn from the chamber 36 through an outlet 122 which may connect through piping 123 with the pressure pump 16 for feeding the fluid operated pumping mechanism in the well, buu should there be no withdrawal of oil, the filtered oil will pass upwardly through the pipe 96 and within the stand pipe 102 to the plane A-A of the outlet end 125 of the stand pipe 101. A check valve 95 is placed at or near the upper end of the pipe 102, as shown, to prevent a reverse flow therethrough, thereby preventing contamination of the clean oil in the chamber 36 from such cause.

To prevent a discharge of filtered oil from the chamber 36 through the stand pipe 102, such stand pipe 102 is purposely made slightly longer than the stand pipe 101. Should the volume of gas in the space 126 above the oil level 120 in the chamber 36 be increased sufficiently to drive the oil level 120 down below the lower end of the pipe 96, a portion of the gas will then pass outwardly through the pipe 96 and the stand pipe 102 to the enclosing pipe 100 to be discharged through the outlet passage 103 into the pipe 112. Likewise, an excess of gas accumulating in the space 116 of the lower chamber 35 may force the oil level 114 down below a small opening 119 near the lower end of the pipe 86 to permit a discharge of gas through the pipe 86 and the stand pipe 101 into the enclosing pipe 100. A withdrawal of oil from the chamber 36 through the outlet 122 will immediately result in a drop in the level 120 of the oil in the chamber 36, with a consequent reduction of pressure in the chainber 36 to a value less than the pressure in the chamber 35, whereupon a flow of oil through the filter medium 69 will start in an attempt to bring the pressures of the chambers 35 and 36 again into static balance.

Since the chambers 35 and 36 both communicate with the delivery pipe 112 through the enclosing pipe 100, the filtration pressure can never exceed the pressure produced by the static head of oil in the stand pipe 101, which may be varied in length in accordance with conditions of operation. Ordinarily the height of the ,outlet 125 of the stand pipe 101 above the pipe 23 is established at twenty feet. Accordingly the pressure in the pipe 112 may vary within wide limits without affecting the pressures controlling the operation of the filter.

The materials filtered from the oil which pass through the filter element, such materials being in this instance silt and sand, accumulate on the outer face thereof, or, in other words, the face thereof presented to the natural or dirty oil, and in more or less time a filter cake is formed which will retard the flow of oil through the filter element. In my device the filtered oil is periodically Lu impelled in reverse direction through the filter element, or, in other words, in a direction reverse to the arrows I7, by operation of the centrifugal pump 43, the impeller of which is so placed that when it is rotated in response to operation of 35 the motor 55, clean oil from the chamber 36 will be forced under pressure through the horizontal pipe 41 in leftward direction and will pass downwardly through the perforate tube 74 of the filter element 69, and then outwardly through the Go filter material 75, dislodging the accumulated materials or filter cake therefrom, which dislodged materials are washed by the reverse flow of oil through the opening 63 at the lower end of the space 84 into the lower part of the cham(;5 ber 35.

The pump 43 is so designed that it will deliver a relatively large flow of fluid under relatively high pressure so that a forceful cleaning action is performed on the filter element 69. The operation of the pump 43 draws the level 120 of the fluid in the chamber 36 down and reduces the pressure in the chamber 36, so that when the pump is stopped, the pressure in the chamber 35 will be materially greater than the pressure in the chamber 36, with the result that the contents of the chamber 36 will be rapidly replenished by the forcing of oil through the cleaned filter element 69.

The lower chamber 116 serves as a settling chamber for sand and water contained in the oil issuing from the pipe 23, and means are provided for removing the settlings from the bottom of the chamber automatically. It will be noted that the lower end 115 of the pipe 86 is near the bottom 83. The opening 119 for escape of gas is relatively small, with the result that the major flow of liquid into the pipe 86 from the chamber 116 is through the lower end 115 of the pipe 86. When there is a surge in the chamber 116 or a reversal of fluid through the filter means 69 dud to the operation of the pump 43, oil passes into the lower end 115 of the pipe 86 at high velocity and carries therewith sand and water which has accumulated on the bottom 24 in an area surrounding the lower end 115 of the pipe 86. By this action the chamber 116 is kept relatively free from settlings, or, in other words, the settlings are not permitted to increase above a small amount.

For controlling the operation of the pump 55, I provide, as diagrammatically shown in Fig. 1, a timing device 130 which is preferably of the electrical type including a synchronous motor 13 0 and having a switch actuating part 132 adapted to periodically close and open a. switch 133 in conductors 134 and 135 which lead from a main switch 136 to the motor 55. The synchronous motor 131 may be energized through conductors 137 and 138 which are connected to the conductors 134 and 135 at points between the switches 133 and 136. The timing device 130 is of adjustable character so that it may be set to automatically close the switch 133 for a short period of time, say for instance five or ten seconds, at selected intervals of time such as every five minutes. Observation of the operation of the filtering device will show to an observer the length of time it takes an obstructive filter cake to form on the filter unit 69, and accordingly the timing device 130 may be adjusted to close the switch 133 at intervals a little shorter than the length of time in which an obstructive filter cake is formed.

The timing device 130 will thereafter operate to automatically cause a reversal of liquid flow through the filter unit 69 at such intervals that the filter material will be maintained unobstructed to an extent permitting an ample filtration of clean oil into the chamber 36.

In the initial starting of the pumping apparatus, clean oil must be supplied to fill the macaroni 13, and if the quantity of clean oil contained in the chamber 36 of the filtering device 25 is not sufficient for this purpose, oil from an external source may be forced into the lower chamber 35, and for this purpose I have shown piping 140 leading from the storage tank I 10 to the pipe 23.

In the piping 140 a small rotary or centrifugal circulating pump 141, operated by a motor 142, may be inserted, so that by opening a valve 144 in the pipe 140, the pump 141 may be operated to first fill the production pipe 15 above the fluid operated pump II and then force oil into the chamber 35 under such pressure that this oil will rise within the stand pipe 101 and will also pass through the filter unit 69 into the chamber 36. After a sufficient quantity of filtered oil has been obtained in this manner to fill the macaroni 13 and the pipe I1 through use of a by-pass 146 having a valve 157 therein, and to fill the lower portion of the chamber 36, the pump 141 may be shut down and the valve 144 closed, whereupon the pump 16 may be operated by means of a power source such as a motor 148 to force oil through the pipe 17 and the macaroni 13 to actuate the fluid operated pump II which will then force a flow of oil upwardly through the production pipe 15 and the pipe 23 into the lower chamber 35. A portion of the oil entering the chamber 35 will rise through the stand pipe 101 and pass through the outlet 103 and the transfer pipe 112 into the reservoir or tank 110, and a portion of the oil controlled in quantity by the capacity of the pressure pump 16 will pass through the filter unit 69 into the chamber 36 of the filtering device 25.

In my invention I havd accordingly provided a pumping system in which the oil flowing from the production pipe of the well is conducted through prescribed channels, and a quantity of this oil, controlled by the operation or needs of the pressure pump 16, is diverted through a filter and subsequently used in cleaned condition to operate the fluid actuated pump in the well. The necessity for an outside source of clean oil or a large storage tank therefore is entirely avoided, and no more of the oil issuing from the well is filtered than is actually required for the operation of the pump in the well.

Although I have herein shown and described RA my invention in simple and practical form, it is recognized that certain parts or elements thereof are representative of other parts, elements, or mechanisms which may be used in substantially the same manner to accomplish substantially the 15 same results; therefore, it. is to be understood that the invention is not to be limited to the details disclosed herein but -is to be accorded the full scope of the following claims.

I claim as my invention: 1. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressuie from said force pump to said fluid operated pump; prcduc icn piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter having its inlet connected to an intermediate part of said production piping so as to receive a portion of the pumped fluid from said production piping; and means connecting the outlet of said filter to the intake of said force pump.

2. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid cperated pump for conveying fluid under prcssure from said fcrce pump to said fluid operated pump; production piping extending from raid fluid operated pump for conducting the pumped fluid therefrom; and a filter connected between an inte:mediate part of said production piping and the intake of said force pump to divert and filter a portion of the flow of the pumped fluid from said production piping and convey said portion to said intake of said force pump.

3. Pumping equipment of the character described, including: a fluid "operated pump discosed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid oper75' ated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter connected between said production piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake of said force pump; and means for producing a substantially constant pressure in said production piping to positively force a portion of the pumped fluid through said filter.

4. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter connected between said production piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake of said force p1ump, there being a stand pipe in said production piping to produce a atatic head in the pumped fluid at the inlet of said filter; and pipe means extending from the cutlet part of said filter to a point in said production piping beyond the upper end of said stand p'pe.

5. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; product:on piping extending from said S5 flu'd cpe ated pump for conducting the pumped fluid therefrom; a filter connected between said prcduction piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake 405 cf said force pump, there being a stand pipe in said production piping to produce a static head in the pumped fluid at the inlet of said filter; and a second stand pipe extending upwardly from the cutlet part of said filter to a point at 4; least as high as the outlet of said first-named stand pipe.

6. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; M0 means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped .5 fluid therefrom; a filter connected between said production piping and the intake of said force pump to permit a filered flow of the pumped fluid from said production piping to said intake of said force pump, there being a stand pipe in CO said production piping to produce a static head in the pumped fluid" at the inlet of said filter; and a second stand pipe extending upwardly from the outlet part of said filter to a point at least as high as the outlet of said first-named stand pipe, the outlet of said second stand pipe being connected to said production piping.

7. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said gorce pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter connected between said production piping and the intake of said force pump -to permit a filtered flow of the pumped fluid from said production piping to said inStake of said force pump, there being a stand pipe in said production piping to produce a static head in the pumped fluid at the inlet of said filter; a second stand pipe extending upwardly from the outlet part of said filter to a point at least as high as the outlet of said first-named stand pipe, the outlet of said second stand pipe being connected to said pr9duction piping and means automatically operating to reverse the fluid flow through said filter from the outlet thereof to the inlet thereof to remove the filter cake.

8. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped. fluid therefrom; a filter connected between said' production piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said prodthction piping to said intake of said force pump; and means automatically 3 operating to reverse the fluid flow through said filter from the outlet pipe thereof to the inlet thereof to remove the filter cake.

S. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said production piping including a stand pipe for producing a static head in the pumped fluid; walls forming a primary chamber connected to said production piping ahead of said stand pipe; walls forming a secondary chamber connected to said primary chamber; a filter between said chambers; means connecting said econdary chamber with the intake of said force pump; and a second stand pipe extending from said secondary chamber to a point above the outlet of said first-named stand pipe.

10. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said production piping including a stand pipe for producing a static head in the' pumped fluid; walls forming a primary chamber connected to said production piping ahead of said stand pipe; walls forming a secondary chamber connected to said primary chamber; a filter between said chambers; means connecting said secondary chamber with the intake of said force pump; and a second stand pipe extending from said secondary chamber to a point above the outlet of said first-named stand pipe, the outlet of said second stand pipe being connected to said production piping at a point beyond the outlet of said first-named stand pipe.

11. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said production piping including a stand pipe for producing a static head in the pumped, fluid; walls forming a primary chamber connected to said production piping ahead of said stand pipe; walls forming a secondary chamber connected to said primary chamber; a filter between said chambers; means connecting said secondary chamber with the intake of said force pump; a second stand pipe extending from said secondary chamber to a point above the outlet of said first-named stand pipe, the outlet of said second stand pipe being connected to said production piping at a point beyond the outlet of said first-named stand pipe; and means automatically operating to reverse the flow of fluid through said filter from said secondary chamber to said primary chamber at intervals to clean the same.

12. Pumping, equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said production piping including a stand pipe for producing a static head in thepumped fluid; walls forming a primary chamber connected to said production piping ahead of said stand pipe; walls forming a secondary chamber connected to said primary chamber; a filter between said chambers; means connecting said secondary chamber with the intake of said force pump; a second stand pipe extending from said secondary chamber to a point above the outlet of said first-named stand pipe; and means for forcing fluid fitm a source other than said well through said filter into said secondary chamber to supply a quantity of filtered fluid for the starting of said pumping equipment.

13. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a 60 production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: creating a positive pressure in said production flow of fluid at a selected point in said production pipe; diverting a portion of said production flow of fluid and filtering the same; and pumping the filtered fluid to said fluid operated pump to actuate the same.

14. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: passing said production flow of fluid through an upright path so as to statically produce a positive pressure in said production flow of fluid at a selected point in said production pipe; diverting a portion of said production flow of fluid through a separate path and filtering the same as it passes through said separate path; and pumping the filtered fluid to said fluid operated pump to actuate the same.

15. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: forming two upright paths of flow for said production flow of fluid, said paths being connected at their lower and upper ends; filtering the portion of the production flow of fluid which passes into the second of said paths, at a point near the lower end of said second path; and drawing filtered fluid from said second path and delivering such filtered fluid under pressure to said fluid operated pump to actuate the same.

16. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: forming two upright paths of flow for said production flow of fluid, said paths being connected at their lower and upper ends, the second of said paths having its upper end above the upper end of the first of said pathr; filtering the portion of the production flow of fluid which passes into the second of said paths, at a point near the lower end of said second path; and drawing filtered fluid from said second path and delivering such filtered fluid under pressure to said fluid operated pump to actuate the same.

17. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: creating a positive pressure in said production flow of fluid at a selected point in said production pipe; diverting a portion of said production flow of fluid and filtering the same; pumping the filtered fluid to said fluid operated pump to actuate the same; and periodically reversing the flow of fluid through said filter to clean the same.

18. Pumping equipment of the character desoribed, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said prbductidn piping including a stand pipe for producing a static head in the pumped fluid; walls forming a primary chamber connected to said production piping ahead of said stand pipe; walls forming a secondary chamber connected to said primary chamber; a filter between said chambers; and means connecting said secondary chamber with the intake of said force pump.

19. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under prgssure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom, said production piping including a stand pipe for producing a static head in the pumped fluid; a filter having its inlet connected to the lower end of said stand pipe so as to receive fluid under pressure therefrom; and means connecting the outlet of said filter with the intake of said force pump.

20. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting'said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; 6 production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter having its inlet connected to an intermediate part of said production piping so as to receive a portion of the pumped fluid from said production piping; a gas outlet means connected to the outlet of said filter; and means connecting the outlet of said filter to the intake of said force pump.

21. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter having its inlet connected to an intermediate part of said production piping so as to receive a portion of the pumped fluid from said production piping; a gas outlet means connected to the outlet of said filter;, flow controlling means for said gas outlet means; and means connecting the outlet of said filter to the intake of said force pump. 22. Pumping equipment of the character described, including: a fluid operated pump dis- posed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operatedpump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter connected between said production piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake of said force pump, there being a stand pipe in said production piping to produce a static head in the pumped fluid at the inlet of said filter; a gas outlet connected to the outlet part of said filter; and flow controlling means for said gas outlet.

23. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; a filter connected between said production piping and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake of said force pump, there being a stand pipe in said production piping to produce a static head in the pumped fluid at the inlet of said filter; a gas outlet connected to the outlet part of said filter, said gas outlet having its outer end connected to said stand pipe; and flow controlling means for said gas outlet. 24. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; and a filter connected between said production pip'ng and the intake of said force pump to permit a filtered flow of the pumped fluid from said production piping to said intake of said force pump, there being a stand pipe in said production piping to produce a static head in the pumped fluid at the inlet of said filter.

25. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said'force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; walls forming a primary chamber connected to said production piping so as to receive a flow of fluid therefrom; walls forming a secondary chamber; a filter connecting said chambers, there being means for producing a gas receiving space in each of said'chambers; means for reversing the flow of fluid through said filter from said secondary chamber to said primary chamber; and means connecting said secondary chamber with said force pump.

26. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid' under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; walls forming a primary chamber connected to said production piping so as to receive a flow of fluid therefrom; walls forming a secondary chamber; a filter connecting said chambers, there being means for producing a gas receiving space in each of said chambers; means for reversing the flow of fluid through said filter from said secondary chamber to said primary chamber; means connecting said secondary chamber with said force pump; and means discharging excess gas from said secondary chamber.

27. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom;- and treating means connected between an interiediate portion of said production piping and the intake of. said force pump, said treating means diverting a portion of saidfluid and delivering to said force pump treated fluid. to be delivered by said force pump to said fluid operated pump, said treating means being adapted to remove an undesirable substance from said fluid delivered to said force pump. 28. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump for conveying fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting the pumped fluid therefrom; means for diverting a part of the pumped flow of fluid from an intermediate part of said production piping to said force pump; and means formiig a part of said diverting means for treating said diverted flow of fluid, said means being adapted to remove an undesirable substance from said diverted flow of fluid.

29. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe to a suitable means of disposal and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: diverting a portion of said production flow from said production pipe; treating said diverted portion of said production flow of fluid, after it is diverted, to remove foreign substances therefrom; and pumping the treated fluid to said fluid operated pump to actuate the same.

30. A method of pumping a well by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: passing said production flow of fluid 'hrough an upright path so as to statically produce a positive pressure in said production flow of fluid at a selected point in said production pipe; diverting a portion of said production flow of fluid and then treating the same to remove foreign substances therefrom; and pumping the treated fluid to said fluid operated pump to actuate the same.

31. A method of pumping a well by use of a fluid operated pump in the well, which pump dis- 3O charges a production flow of fluid through a production pipe and is connected through a pressure pipe with a force pump situated at the top of the well, comprising: passing said production flow of fluid through an upright path so as .to statically produce a positive pressure in said production flow of fluid at a selected point in said production pipe; diverting a portion of said production flow of fluid under pressure of said static head and then treating the same; finally pumping the treated fluid to said fluid operated pump to actuate the same.

32. Pumping equipment of the character described, including: a fluid operated pump disposed to pump a natural fluid; a force pump; means connecting said force pump to said fluid operated pump to convey fluid under pressure from said force pump to said fluid operated pump; production piping extending from said fluid operated pump for conducting'the pumped fluid therefrom to a point of disposal; means forming a passage from an intermediate portion of said production piping to the intake of said force pump, for diverting a portion of the flow of pumped fluid from said production piping; and means disposed in said passage operative to remove unwanted substances from said diverted flow of pumped fluid.

33. A method of pumping a well. by use of a fluid operated pump in the well, which pump discharges a production flow of fluid through a production pipe and is connected through a pressure pipe with.a force pump situated at the top of the well, comprising: diverting a portion of said production flow of fluid; filtering said portion of said production flow of fluid so as to remove an undesirable substance therefrom; and delivering at least a part of said filtered portion of said flow of fluid to the inlet of said force pump so that said force pump may deliver said filtered fluid to said fluid operated pump.

CLARENCE J. COBERLY.