Title:
Packing casing bowl
United States Patent 2017451
Abstract:
This invention relates to a 'device for use in ti wells and relates more particularly to a casing fa bowl for connecting two sections of casing in a well. It is a general object of the invention to b provide a simple, practical casing bowl to be f run into a well on a string of casing, and...


Inventors:
Wickersham, Harry P.
Application Number:
US69900333A
Publication Date:
10/15/1935
Filing Date:
11/21/1933
Assignee:
BAASH ROSS TOOL COMPANY
Primary Class:
Other Classes:
166/277, 285/346, 294/86.3
International Classes:
E21B33/12
View Patent Images:
Description:

This invention relates to a 'device for use in ti wells and relates more particularly to a casing fa bowl for connecting two sections of casing in a well. It is a general object of the invention to b provide a simple, practical casing bowl to be f run into a well on a string of casing, and that a is adapted to dependably and securely connect with the portion of casing remaining in the well, P and to effectively pack and seal therewith. Well casing sometimes breaks or parts in the c well, and in other instances it becomes necessary to sever or cut the casing in the well to permit a defective part of the casing to be replaced.

When a well casing has broken or has been cut, the freed upper portion is pulled from the well and new or replacement casing is run into the well to replace it. A device commonly known as a casing bowl is usually provided on the lower end of the string of replacement casing to connect with the portion of casing remaining in the well.

It is customary to provide a casing bowl with packing for sealing or packing with the casing in the well. The longitudinal strain to which a string of well casing is normally subjected causes the packing of the typical casing bowls to be forced or flowed out of position so that it is not effective in sealing with the casing in the well.

It is an object of this invention to provide a casing bowl adapted to be attached to the lower 80 end of a string of replacement well casing that is capable of dependably connecting with a section of casing in the well, and of maintaining a tight, effective packing engagement or seal with the casing in the well.

85 It is another object of the invention to provide a casing bowl of the character mentioned in which the packing is not displaced or caused to flow out of its proper sealing position by the longitudinal strain on the casing.

It is another object of the invention to provide a packing casing bowl in which the packing is closely confined between two spaced rings arranged in the body of the bowl adapted to contract onto the well casing so that it cannot be pressed or forced out of position.

It is another object of the invention to provide a packing casing bowl embodying improved and particularly effective packing means.

It is another object of the invention to provide a packing casing bowl that it adapted to connect and pack with casing In the well of the same diameter as the replacement casing to which it is attached.

It is a further object of this invention to provide a packing casing bowl of the character menoned that is simple and inexpensive of manuLeture.

Other objects and features of the invention will e better and more fully understood from the ollowing detailed description of a typical form nd application of the invention, throughout ihich description reference is had to the accomanying drawings in which: Fig. 1 is a longitudinal detailed sectional view f the casing bowl provided by the present in'ention illustrating it attached to a casing being owered into a well, and in a positon about to pass onto a section of casing in the well. Fig. 2 s an enlarged longitudinal detailed sectional iew of the casing bowl illustrating it in positon around the casing in the well, and with its parts n the unactuated positions. Fig. 3 is a view simlar to Fig. 2 showing the parts of the casing bowl in the actuated positions. Figs. 4 and 5 are enarged transverse detailed sectional views taken as indicated by lines 4-4 and 5-5 respectively, on Fig. 3.

The casing bowl provided by this invention includes generally a body 10 adapted to be connected to the lower end of what I will term replacement casing R, and adapted to pass over the upper portion of a section of casing C in a well W, sealing or packing means 1I in the body 10 for packing with the casing C, and means 12 for gripping the casing C. The body 10 is an elongate tubular structure carrying or housing the various other parts of the device. The tubular body 10 is intended to be attached to the lower end of a string of replacement casing, and is adapted to receive or pass over the upper portion of a section of casing C in a well. In the embodiment of the invention illustrated in the drawings, the body 10 is sectional, including an upper section 13 and a lower or main section 14. The upper section 13 of the body is adapted to be threaded onto the lower end of the casing R, having a threaded socket 15 for the reception of the threaded lower end of the casing.

A downwardly facing annular shoulder 16 is provided on the interior of the upper body section 13. The opening 17 in the body section 13 is sufficiently large in diameter to freely receive the upper portion of the casing C, and the shoulder 16 may come into engagement with the upper end of the casing to limit the downward movement of the device on the casing. The lower or main section 14 of the body is threadedly connected with the upper section 13 at 18. The lower end of the section 13 forms downwardly facing shoulders 19 in the body. The lower end part of the section 14 is shaped to effectively pass over or onto casing C, having a rounded lower end and i wardly and inwardly converging inner walls An upwardly facing annular shoulder 21 is p vided on the inner wall of the lower body secti 14 at the upper end of the converging wall The shoulder 21 is inclined downwardly and wardly. The lower body section 14 is pref ably comparatively long, a illustrated throughc the drawings, and the major portion of its openi 22 extending from the shoulder 19 to the slho der 21 is larger in diameter than the casing so that it is adapted to carry the packing mea I and the gripping means 12. It is to be not that the body 10 and the other parts of the devi are proportioned so that the device is adapted connect two lengths or sections of casing of tl same diameter.

The packing means I is provided to pack b tween the casing C in the well and the body I The packing means II includes a multiplicity packing rings 23 arranged in the body opening above the shoulder 21. The packing rings 23 ai superimposed -or arranged one on the other, an their abutting ends 24 are inclined. In the pai ticular case illustrated the cooperating or abut ting ends 24 of the packing rings 23 are incline downwardly and inwardly. The outer ends of th uppermost and lowermost packing rings 23 ar flat and normal to the longitudinal axis of th tool. The packing rings 23 are of the same re spective internal and external diameters, and th opening formed by the multiplicity of packin rings 23 is initially sufficiently large in diamete to pass the casing C with suitable clearance, a illustrated in Fig. 2 of the drawings. In accord ance with the invention, the packing rings 23 ar formed of lead or its substitutes. In being former of lead, or the like, the packing rings 23 are capa. ble of making a very tight and effective seal between the casing C and the inner wall of the bod3 10, and are not as soft and subject to undesirable distortion and flowing as rubber or rubber compositions.

It is a feature of the invention that rings 26 of steel, or the like, are arranged in the body opening 22 at the opposite ends of the assembly of packing rings 23. The rings 26 act as packing glands as they operate to retain or hold the packing in place. The rings 26 at the opposite endsof the assembly of packing rings 23 prevent the material of which the packing rings are formed from being pressed or forced out from between them. The rings 26 are split and have lapped parts 27 at their cuts or splits. The lapped parts 27 are related so that the rings 26 are capable of substantial expansion and contraction. The ends or end faces of the rings 26 engaging the exposed ends of the uppermost and lowermost packing rings 23 are preferably flat and normal. The upper end 28 of the upper ring 26 is inclined downwardly and outwardly for cooperating with an element of the gripping means 12 as will be subsequently described. The lower end 29 of the 65. lower ring 26 is inclined downwardly and inwardly to cooperate with the correspondingly inclined body shoulder 21. The gland rings 26 are initially of substantially the same internal and external diameters as the packing rings 23. The rings 26 are adapted to be contracted onto the casing C to grip the casing and prevent the packing 23 from being forced or flowed longitudinally of the casing.

The gripping means 12 is adapted to grip the casing C and to provide for the compression or actuation of the packing means Il when an upthe strain is taken and maintained on the casing.

Ip- The gripping means 12 includes a sleeve or tubular 20. spider 30, and a slip or gripping member 31 in ro- the spider. The spider 30 is shiftable or slidable ion longitudinally in the body opening 22 and nor- a 20. mally or initially has limited longitudinal moven- ment in the body between the shoulder 16 and the r- upper ring 26. The lower end 32 of the spider 30 >ut is adapted to cooperate with the upper end 28 ng of the upper ring, being of the same pitch or inl- clination as the face 28. The spider 30 is preferC ably comparatively long, and the walls of its openns ing 35 are downwardly and inwardly convergent, ed as illustrated throughout the drawings. ce The slip or gripping member 31 is a tubular to element arranged within the spider 30. The ie gripping member 31 is operated or contracted upon upward movement of the spider 30 to e- tightly grip the casing C. The exterior or pe0. riphery of the gripping member 31 is tapered or of inclined downwardly and inwardly to have slid22 ing cooperation with the interior of the spider re 30. A plurality of circumferential ridges or Ld teeth 38 is provided on the interior of the gripS ing member 31 to bite into or grip the casing. SIn accordance with the invention, the gripping d member 31 is longitudinally split to be contractLe ible upon upward movement of the spider 30 e relative to the gripping member. Meshing or e overlapping parts 40 are provided at the longi- tudial split in the gripping member 31 to pree vent the longitudinal distortion of the gripping g member. The gripping member 31 is adapted to r pass downwardly around the casing C when the s tool is run onto the casing, and its upward move- 3l - ment with respect to the body 10 is limited by e the downwardly facing shoulder 19.

d The upper end portion of the casing C remain- ing in the well is preferably cleaned off or Ssmoothed off by suitable tools prior to the run- 4b ning of the new or replacement casing into the well. This treatment of the casing C prepares Sit for reception in the casing bowl. The casing bowl of the invention is adapted to be attached to the lower end of the new or replacement casing R, and is adapted to be run into the well with its parts in the positions illustrated in Fig. 1 of the drawings. Upon the device reaching the upper end of the casing C, the guiding lower portion of the body 10 guides the body onto the casing C. The packing rings 23 and the gland or retaining -rings 26 may pass over the casing C with suitable clearance, while the gripping member may yieldingly contact with the casing C so that it is held up against the shoulder 19 as the device passes downwardly over the casing C. When the new or replacement casing R has been lowered Until the shoulder 16 engages the upper end of the casing C, an up pull or strain may be put on the casing R to actuate the cas- O0 ing bowl. The upward mdvement of the body 10 on the lower end of the casing R, of course, results in corresponding upward movement of the spider 30, which is supported on the body shoulder 21 through the packing means I . The 05 cooperating inclined surfaces of the spider 30 and gripping member 31 cause the gripping member to be tightly contracted into gripping and holding engagement with the casing C as the spider 30 moves upwardly relative to the gripping member. The suitable upstrain or tensile strain applied to and maintained on the casing R is transmitted from the body 10 to the casing C through the packing means II, the spider 30 and the gripping member 31. As just 75described, this up pull or tensile strain contracts pa the gripping member 31 onto the casing C and wi maintains it in tight cooperation with the cas- si ing C. The force or strain transmitted through gi the packing means l causes the packing rings fo 23 to be compressed tightly against the exterior m of the casing C and the wall of the body open- gi ing 22. The inclined body shoulder 21 in acting tl upwardly against the inclined lower end of the er lower ring 26 causes contraction of the ring 26 so that it tightly grips and seals with the cas- i ing C. The cooperation of the inclined upper cn end 28 of the upper ring 26 with the lower end ir of the spider 30 results' in similar contraction tc of the upper ring 26 so that it too tightly grips cp the casing C. The contraction of the rings 26 p onto the casing C prevents the packing rings 23 s] from being flowed or forced upwardly or down- e wardly around the casing. It will be apparent p how the rings 26 act to retain the packing rings p 23 in their proper positions and proper sealing g condition so that an effective seal may be maintained between the casing C and the body 10 for t an indefinite period. The material of which the ( packing rings 23 are formed cannot be forced or squeezed out from around the casing C as the contracted rings 26 completely close off the space between the body 10 and casing C at the upper and lower ends of the assembly of packing rings. It is to be noted that the present invention provides a packing casing bowl that is positive and dependable in operation, and that is capable of maintaining an effective seal or packing cooperation with the casing in the well indefnitely. Having described only typical forms and applications of the invention I do not wish to be limited or restricted to the specific forms or applications herein set forth, but wish to reserve to myself any modifications or variations that may appear to those skilled in the art or fall within the scope of the following claims: Having described my-invention, I claim: 1. In a casing bowl, a tubular body adapted to be passed over a casing, ductile packing in the body for packing between the body and the casing, and contractible members at the opposite ends of the packing initially freely passing the casing and adapted to contract under pressure onto the casing to prevent the packing from escaping along the casing.

2. In a casing bowl, a tubular body adapted to be passed over a casing, packing in the body for packing between the body and the casing, and flexible split rings engaging the opposite ends of the packing initially receiving the casing with clearance and adapted to contract onto the casing to prevent the packipg from escaping along the casing.

3. In a casing bowl, a tubular body to be passed over a casing, an assembly of ductile metallic packing rings in the body operable under compression eto seal between the body and casing, contractible members at the ends of the assembly contractible onto the casing to tightly embrace the same when the assembly is put under compression to prevent the packing from flowing longitudinally of the casing, and means for putting the assembly and the members under compression.

4. A casing bowl including a tubular body to be passed over a casing, means supported in the body for packing with the casing, said means including packing expansible inwardly under compression to seal with the body and casing, and contractible rings at the opposite ends of the cking adapted to initially receive the casing .th clearance and contractible under comprcson to tightly embrace the casing to prevent lontudinal spreading of the packing, and means r gripping the casing supported by the packing eans through one of said rings whereby a lontudinal strain on the device is transmitted irough the packing to contract the rings and xpand the packing.

5. A device of the character described includig, a tubular body adapted to be passed over a asing in a well, there being an inclined shoulder the body, packing in the body for sealing beween the body and the casing when subjected to ompression, a flexible split ring at an end of the acking having an inclined surface seated on said houlder whereby the ring contracts into close ngagement with the casing when under comression, the ring having a normal surface suporting one end of the packing, and means for ripping the casing and supported by the packng whereby the packing and ring are subjected o compression when a longitudinal strain is put n the body.

6. A well tool including, a tubular body adapted ;o be passed over a casing in a well, packing supported in the body to move therewith and expansible under compression to seal between the body and the casing, a split ring on the upper end of the packing contractible to tightly embrace the SO casing when under compression and having an inclined face, a member in the body having an inclined end resting on said face, and means carried by the member for gripping the casing to be held against upward movement whereby the packing is compressed and the ring contracted when an upward strain is put on the body.

7. A device of the character described including, a tubularEbody adapted to be passed over a casing in a well, there being an inclined shoulder in the body, packing in the body for sealing between the body and the casing when subjected to compression, a-split ring at the lower end of the packing having an inclined face seated on said shoulder to support the packing in the body, a split ring on the upper end of the packing having an inclined upper end, the rings initially freely receiving the casing and contractible to tightly embrace the casing, a member having an inclined surface seated on said inclined end of the last mentioned ring, and a casing gripping element actuated by the member into stationary gripping engagement with the casing when an upward strain is put on the body whereby the packing and rings are put under compression by the strain.

8. In a casing bowl, a tubular body adapted to pass over a casing in a well, and a packing assembly supported in the body for sealing between the inner wall of the body and the casing, saidassem- 00 bly including a plurality of superimposed rings whose abutting ends are inclined downwardly and inwardly.

9. In a casing bowl, a tubular body adapted to pass over a casing in a well, a packing assembly 6O supported in the body, said assembly including a plurality of superimposed lead rings having their abutting ends inclined downwardly and inwardly, and means for maintaining the assembly under compression to expand it into packing engagement with the inner wall of the body and the casing.

10. A well tool including, a tubular body adapted to be passed over a casing, packing supported in the body and expansible under compression T5 to seal between the body and the casing, a tubular spider in the body supported by the packing, the interior of the spider being downwardly convergent, and a tubular longitudinally split slip .o5 operable through cooperation with the interior of the spider when an upward strain is put on the body to hold the spider against movement whereby the strain compresses the packing to grip the casing, the slip having lapped parts at its split.

11. In a casing bowl, a tubular body adapted to pass over a casing in a well, a tubular packing assembly in the body compressible into packing Y3operation with the body and casing, and split 13. rings at the ends of the packing contractible onto the casing when under compression to prevent the packing from flowing longitudinally, the rings having lapped parts at their splits to prevent the flow of packing therethrough.

12. A casing bowl including a tubular body to be run into a well on the lower end of a well casing to pass over the upper portion of a casing in the well, the longitudinal opening in the body having an upper portion as large in diameter as the openings in the said casings to form a continuation thereof and having a lower portion of enlarged diameter, an upwardly facing shoulder in the lower portion of the body, a flexible split a ring on the shoulder contractible onto the second mentioned casing when under compression, a packing assembly resting on said ring contractible under compression to seal between the body and second mentioned casing, a flexible split ring on I$ the upper end of the packing assembly contractible onto the second mentioned casing under compression, a tubular member resting on the last mentioned ring having an inclined internal surface, and a gripping slip in the tubular member 1I actuated into substantially stationary gripping engagement with the second mentioned casing when an upward pull is put on the first mentioned casing to hold the tubular member relatively stationary whereby the packing assembly 23 and the rings are compressed between the sh9ulder and the tubular member by the upward pull.

HARRY P. WICKERSHAM.