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3957115 Method and apparatus for treating wells  
A method of incrementally treating a section of an earth formation around a well to improve fluid flow into the well. The method includes the steps of installing a well casing provided with spaced...
3939927 Combined gravel packing and perforating method and apparatus for use in well bores  
A well tool apparatus having a perforating section at its lower end has an upper section comprised of a reservoir containing a compatible perforating fluid and a pump for pumping such fluid down...
3918522 Well completion method and system  
A well completion method is provided wherein an inflatable packer is positioned in an open borehole of a well opposite a formation from which or into which a fluid is to flow. Cement is then...
3912013 High temperature perforating method  
A high temperature well completion method is carried out by releasably suspending a perforating gun uphole in a relative low temperature region of the borehole. A wireline actuated releasable...
3903974 Drilling assembly, deviation sub therewith, and method of using same  
A drilling assembly, deviation sub therewith, and method of using same, wherein the deviation sub is for directional drilling of a well bore, and has an elongate deviation sub body adapted to be...
3860076 COMBINATION JAR AND RELEASING TOOL  
A combination hydraulic jar and releasing tool for wire line operation. The releasing tool has a dog positioned with a "J", with part of the "J" forming a spline which is received within the...
3856094 APPARATUS FOR UTILIZING COMPATIBLE PERFORATING FLUID IN WELL BORES  
A well tool apparatus having a perforating section at its lower end has an upper section comprised of a reservoir containing a compatible perforating fluid and a pump for pumping such fluid down...
3844352 METHOD FOR MODIFYING A WELL TO PROVIDE GAS LIFT PRODUCTION  
In the method, a perforating device equipped with perforation forming means is lowered through a conventional tubing string and locked with a collar recess at a predetermined subsurface location....
3830303 METHOD OF WELL COMPLETION IN PERMAFROST  
A method and apparatus for drilling, completing, and/or producing a well through a permafrost zone wherein a liquid such as water is either introduced into a thawed region of the permafrost to...
3830299 SHALLOW PLUGGING SELECTIVE RE-ENTRY WELL TREATMENT  
The pattern of fluid flow between a well and one or more subterranean reservoirs having different characteristics and/or fluid content is adjusted by determining the flow pattern, plugging all of...
3820604 SELECTIVELY PERFORATING AND TREATING A CASED WELL  
3789923 METHOD AND APPARATUS FOR MODIFYING A WELL TO PROVIDE GAS LIFT PRODUCTION  
In the method, a perforating device equipped with perforation forming means is lowered through a conventional tubing string and locked with a collar recess at a predetermined subsurface location....
3771601 WELL BORE BLOCKING METHOD  
A blow-out preventer comprising a relatively large body means which is placed in a well bore. The body means is provided with a bore through which drill pipe and the like can extend. Traversing...
3754599 USE OF MICELLAR SOLUTIONS TO IMPROVE PERFORATING PROCESS  
A process of perforating an oil-bearing subterranean formation wherein the perforations in the reservoir are caused by a hole-producing apparatus, the improvement comprising perforating the...
3750748 LINER SEPARATION APPARATUS  
Apparatus for separating an upper portion of a metallic liner from the inside wall of oil well production tubing to prepare said liner for removal therefrom. The apparatus includes a plurality of...
3730282 MECHANICALLY ORIENTED PERFORATING SYSTEM  
There is disclosed an apparatus for mechanically orienting a through-tubing perforating gun in a multiple completion wall for perforating an upper formation without damage to other tubing strings...
3727690 METHOD OF FRACTURING A NATURAL GAS BEARING EARTH FORMATION  
A method of fracturing a natural gas bearing earth formation penetrated by a well bore by introducing a charge of oxygen into the well bore and into the producing formation in such volume as to...
3727692 LINER REMOVAL APPARATUS  
A method and apparatus for removing a metallic liner from the inside wall of production tubing downhole in an oil well which includes a longitudinal spear member eccentrically attached to a...
3727685 METHOD FOR THERMALLY CUTTING TUBING  
A method for thermally cutting tubing, such as below an internal restriction in a tubing string located in a well bore, which comprises placing in the tubing at the desired location a mixture of...
3724550 METHODS FOR RECOMPLETING WELLS  
As a preferred mode of the new and improved methods disclosed herein for recompleting a production well without removing an existing production string, an intermediate length of the production...
3712376 CONDUIT LINER FOR WELLBORE AND METHOD AND APPARATUS FOR SETTING SAME  
A method of emplacing a liner in a conduit in a well penetrating subterranean formations characterized by positioning with a wire line a cylindrical annular liner at a given depth in the well, the...
3712379 MULTIPLE FRACTURING PROCESS  
A process for fracturing an earth formation includes perforating well casing along a first substantially vertical plane, and along a second substantially vertical plane located in the same...
3708013 METHOD AND APPARATUS FOR OBTAINING AN IMPROVED GRAVEL PACK  
This specification discloses a process for providing a gravel pack adjacent a subsurface formation in a well having a string of casing therein. In carrying out this process, first perforations are...
3706340 METHODS FOR PERFORATING AN EARTH FORMATION  
As a preferred mode for practicing the invention disclosed herein, one or more sets of selectively-fired perforating devices are positioned in a well bore and the first of two adjacent devices is...
3706344 TUBING CONVEYED PERMANENT COMPLETION METHOD AND DEVICE  
Method and apparatus for effecting a dual completed well wherein the lower zone is packed off or isolated from the upper zone prior to perforating either zone; the upper zone is then completed,...
3704749 METHOD AND APPARATUS FOR TOOL ORIENTATION IN A BORE HOLE  
An orienting device for a gun or jet perforator or the like to permit setting at a selected angle to a ferrous element such as an adjacent casing string, comprising an exciter coil producing an...
3693717 REPRODUCIBLE SHOT HOLE  
A reproducible shot hole for geophysical use wherein a deformable metal liner, such as aluminum, of predetermined diameter, wall thickness, and alloy is selected, and the annulus between the liner...
3684008 WELL BORE BLOCKING MEANS AND METHOD  
A blow-out preventer comprising a relatively large body means which is placed in a well bore. The body means is provided with a bore through which drill pipe and the like can extend. Traversing...
3684042 WELL JAR WITH EXTERNALLY OPERABLE TRIP RELEASE  
A well jar having telescoping members movable between extended and retracted positions, a tripping mechanism for releasably retaining said members in retracted position, and means operable at the...
3675718 CONDUCTING OPERATIONS IN A WELL THROUGH A NORMALLY CLOSED VALVE  
An operation is conducted in a well below a normally closed valve therein having a full open bore therethrough which involves running a tubular member having a passageway therethrough into the...
3675719 TUBING HANGER ASSEMBLY AND METHOD OF USING SAME  
A tubing hanger assembly and method of using same, wherein a continuous tubing having a smooth external surface which is to be left in a well after insertion is supported by the hanger assembly so...
3664423 TIE-BACK SYSTEM FOR UNDERWATER COMPLETION  
The tie-back collar of an inner casing is provided with a protector sleeve which is sealed in place and supported against rotation. To temporarily abandon the well after the annulus between the...
3647000 METHOD FOR CONTROLLING WELL BLOWOUTS  
Uncontrolled flow of oil and gas from petroleum wells located in a body of water, is stopped by a procedure performed below the water surface at a location which is free from wave action and is...
3642070 SAFETY VALVE SYSTEM FOR GAS LIGHT WELLS  
A safety valve system for wells including a valve connected in a tubing string for shutting off flow to the surface in the tubing. The valve is biased to an open position by fluid pressure in the...
3630282 METHODS AND APPARATUS FOR PERFORATING EARTH FORMATIONS  
This application discloses new and improved methods for perforating earth formations and then cleaning debris and the like from such perforations. To practice the present invention, a new and...
3621916 SPARK-TYPE CASING PERFORATOR  
An electrical spark jet for perforating well casings and formations wherein a shaped spark discharge is used to form a jet of fluid. The electrodes for the shaped spark discharge comprise a center...
3612189 WELL PERFORATING AND TREATING APPARATUS  
A well completion apparatus for perforating and injecting a fluid into a formation surrounding a cased wellbore. The apparatus includes a body unit defining an enclosed chamber, a perforator...
3601196 REMOTE PERFORATING IN DUAL COMPLETION WELLS  
Method for perforating in a dual, parallel pipe string tubingless well. A crossover passage or port connects these pipe strings. Each pipe string is provided with a landing nipple at about the...
3599719 METHOD AND APPARATUS FOR PROVIDING CLEAN PERFORATIONS IN A WELL BORE  
A method is provided for perforating the casing of a well and for sealing an isolated flow path from the formation adjacent the casing through the casing wall and into the perforating tool. The...
3572438 PROCESS OF PLUGGING PERFORATIONS IN A WELL CASING  
Wells may be recompleted at different formations either above or below existing perforations by a process which may include pumping a slug of cement down through the tubing, the well having either...
3542132 METHOD OF SQUEEZE CEMENTING A WELL  
3527302 APPARATUS AND METHOD FOR WORKING A WELL WITH PLURAL LEVELS OF PERFORATIONS  
3517745 WELL PERFORATING METHOD  
3483926 CONSOLIDATION OF OIL-BEARING FORMATIONS  
3482633 METHOD OF FRACTURING FORMATIONS IN A WELL  
3478825 METHOD OF INCREASING THE VOLUME OF A PERMEABLE ZONE WITHIN AN OIL SHALE FORMATION  
3461964 WELL PERFORATING APPARATUS AND METHOD  
3454093 ROTATING GAS LIFT MANDREL FOR WELL PIPE STRINGS  
3447607 METHOD FOR SAND CONTROL IN WELLS  
3443639 METHOD FOR CONSOLIDATING AN UNCONSOLIDATED SAND WITH A PLASMA JET STREAM