Matches 351 - 396 out of 396 < 1 2 3 4 5 6 7 8


Match Document Document Title
4047568 Method and apparatus for cutting and retrieving casing from a well bore  
An apparatus for cutting and recovering casing from a well which includes a well string having a swivel mounted thereon, a gripping assembly, a lower drive cone, and a cutter mounted on the lower...
4009753 Subsea master valve apparatus  
A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a ball valve element provided with the...
4003433 Method for cutting pipe  
Method of cutting pipe using a pipe cutter including annular, axially aligned, gear, grip and cutter sections and a central shaft within the sections. The shaft is geared to the gear section for...
3920070 Pipe cutter  
Disclosed is a pipe cutter including annular, axially aligned, gear, grip and cutter sections and a central shaft within the sections. The shaft is geared to the gear section for rotation in...
3908759 Sidetracking tool  
A new apparatus and method are described for side-tracking a hole drilled in the earth and lined with casing. A modified bridge plug having a latch-up device on top is set using an electric cable...
3871456 METHODS OF TREATING WELLS  
A method of and apparatus for treating wells to provide surface controlled subsurface safety systems in the wells, whether previously completed wells or newly completed wells. A method and...
3738424 METHOD FOR CONTROLLING OFFSHORE PETROLEUM WELLS DURING BLOWOUT CONDITIONS  
Method for controlling petroleum wells, particularly those offshore, during blowout conditions, wherein special drill-through valves are externally mounted on a well casing at longitudinally...
3720262 METHOD AND APPARATUS FOR SUB-SURFACE DEFORMATION OF WELL PIPE  
Laterally directed deformation force is applied to structure at a selected location in a longitudinal bore hole, through use of a tool that comprises a pressure responsive actuator having a...
3690380 WELL APPARATUS AND METHOD OF PLACING APERTURED INSERTS IN WELL PIPE  
A projection containing through porting is displaced endwise and relatively through a well casing wall to cause the projection to penetrate the surrounding formation. The displacement is completed...
3637020 TENSILE-STRESS FRACTURING  
In fracturing a subsurface earth formation, an oriented tensile stress that is focused in a plane that is perpendicular to the axis of a borehole is utilized to initiate a horizontal fracture. The...
3631928 APPARATUS FOR AND METHOD OF CUTTING OFF FLOW FROM WILD GAS AND OIL WELLS  
Two hollow hemispheres diametrically drilled to fit around a pipe casing, and exteriorly flanged for bolting together to isolate a section of said casing intermediate its ends, said hemispheres...
3534816 METHOD AND APPARATUS FOR COMPLETING A WELL IN VERTICALLY SPACED POROUS STRATA  
RE05092 Title is not available  
3605889 ETCHED OIL SHALE FRACTURING  
3426851 METHOD AND APPARATUS FOR OPERATING IN WELLS  
3393736 Well completion method  
3378072 Method and apparatus for severing well casing in a submarine environment  
3373816 Method for injector tubing gas lift  
3347053 Partially salvageable jacket-pile connection  
3338305 Method and apparatus for cutting casing in underwater installations  
3330339 Method of removing a wellhead assembly from the ocean floor  
3316963 Repair of wells  
3313348 Process of forming vertical well bore fractures by use of circumferential notching  
3301337 Apparatus for completing a well  
3299951 Method and apparatus for hanging well pipe  
3299954 Method and apparatus for hanging a well casing in a well bore  
3280913 Vertical fracturing process and apparatus for wells  
3277964 Method for controlling the discharge of combustible fluid from oil wells and the like  
3270816 Method of establishing communication between wells  
3266571 Casing slotting  
3242985 Method for re-entry of damaged well pipe  
3225828 Downhole vertical slotting tool  
3223164 Method of actuating fluid pressure operated mechanism of underwater well installation  
3220495 Method for positively determining the location of a drill string  
3211221 Process for fracturing an underground formation  
3193012 Method of cutting a notch in an underground formation penetrated by a well  
3175613 Well perforating with abrasive fluids  
3170517 Fracturing formation and stimulation of wells  
3130786 Perforating apparatus  
3110257 Well perforating method and apparatus  
3083765 Method and apparatus for conditioning bore holes  
3066736 Hydraulic perforating gun  
2942092 Internal tube cutter  
2934147 Apparatus for severing subsurface well devices  
2919111 Shearing device and method for use in well drilling  
2840166 Apparatus for closing wild wells through a pressure chamber  

Matches 351 - 396 out of 396 < 1 2 3 4 5 6 7 8