| Patent Number |
Title Of Patent |
Date Issued |
| RE32755 |
Accelerated downhole pressure testing |
September 27, 1988 |
| The present invention provides a method and apparatus for completing a well by means of a perforating gun attached to the downhole end of a string of production tubing, producing the well until it is clean, shutting-in the well at a point relatively near the perforating gun, and measurin |
| RE32302 |
Fracturing method for stimulation of wells utilizing carbon dioxide based fluids |
December 9, 1986 |
| A method of fracturing a subterranean formation with a stabilized foamed fracturing fluid comprising from about 50 percent to in excess of about 96 percent by volume of carbon dioxide with the remainder comprising an aqueous liquid and a selected surfactant. The foam is formed in situ by |
| RE31190 |
Oil well cementing process |
March 29, 1983 |
| Oil well cementing compositions and processes are produced using a high efficiency sulfoalkylated lignin retarder composition and modifications thereof to produce cement compositions without gelation problems, having high early strength and with precisely controllable setting time. |
| RE31127 |
Oil well cementing process |
January 18, 1983 |
| Oil well cementing compositions and processes are produced using a high efficiency sulfoalkylated lignin retarder composition and modifications thereof to produce cement compositions without gelation problems, having high early strength and with precisely controllable setting time. |
| RE30484 |
Zonal fracture treatment of well formations |
January 20, 1981 |
| Methods are provided for treating an underground well formation whereby the treatment is confined to a desired zone within the formation. The methods comprise introducing one or more preflush fluids into one or more fractures in the formation followed by the introduction of a treating |
| RE29562 |
Method and apparatus for testing wells |
March 7, 1978 |
| A method and apparatus for testing offshore wells where variations in well annulus pressure are utilized to control the valving operation of a testing tool and entrap a formation sample.A confined body of pressurized fluid positoned in a testing string is utilized to predetermine the ann |
| RE29471 |
Oil well testing apparatus |
November 15, 1977 |
| A ball valve type, full opening bore, oil well formation tester utilizes a J-slot mechanism and vertical tool string manipulations to open and close a substantially unrestricted axial bore through the testing tool to allow formation fluid flow through the tool at the command of the tool |
| H1675 |
Hybrid capsule charge |
September 2, 1997 |
| An improved capsule-type charge for use in perforating high temperature production zones in oil or gas wells is disclosed. The improvement consists of using a secondary initiating compound as an initiator, such as 1,3,5-Trinitro-2,4,6-Tripicrylbenzene or 2,2',2",4,4',4",6,6',6",-Nona |
| D274227 |
Hydraulic filter press for pressing liquid from a drilling mud or the like |
June 12, 1984 |
|
| D271570 |
High temperature, high pressure filter press for testing drilling fluids or similar apparatus |
November 29, 1983 |
|
| D270718 |
Field hand pump for use in the measuring of properties of drilling mud, or the like |
September 27, 1983 |
|
| D268820 |
Pressurized density measuring apparatus |
May 3, 1983 |
|
| D260739 |
Viscometer |
September 15, 1981 |
|
| 5871577 |
Methods of retarding cementitious compositions |
February 16, 1999 |
| The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanolamine salt produced by the reacti |
| 5851960 |
Method of performing well drilling operations with a foamable drilling fluid |
December 22, 1998 |
| A foamable drilling fluid for use in well operations such as deep water offshore drilling where risers are not employed in returning the fluid to the surface mud pit. A preferred foamable drilling fluid comprises a prehydrated clay such as bentonite, sea water, a surfactant selected from |
| 5845711 |
Coiled tubing apparatus |
December 8, 1998 |
| The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. A packer member is releasably connected to the connector member. The packer member includes a pack-off element and slips for |
| 5832998 |
Coiled tubing deployed inflatable stimulation tool |
November 10, 1998 |
| A resettable well stimulation tool is lowerable into a well bore on a length of tubing through which pressurized fluid may be forced into the tool to inflate a packer portion carried by the tool and then discharge a stimulation fluid into a portion of the well bore sealed off by the pack |
| 5823273 |
Well stabilization tools and methods |
October 20, 1998 |
| The present invention relates to tools and methods for stabilizing incompetent or otherwise unstable subterranean zones or formations penetrated by a well bore during drilling. The methods basically comprise drilling the well bore through an enlarged portion of an unstable subterrane |
| 5803168 |
Tubing injector apparatus with tubing guide strips |
September 8, 1998 |
| A tubing injector apparatus for guiding coiled tubing and inserting the tubing into a well. The apparatus includes a tubing guide portion which has a curvilinear first frame and a curvilinear second frame spaced from the first frame. An elongated first guide track is attached to the firs |
| 5799731 |
Tubing guide with optimized profile and offset |
September 1, 1998 |
| An apparatus for guiding and directing tubing into a coiled tubing injector apparatus is disclosed. The tubing guide will direct the tubing into the coiled tubing injector apparatus for insertion or removal into the wellbore therebelow. The natural, or residual radius of the tubing is |
| 5795924 |
Resilient well cement compositions and methods |
August 18, 1998 |
| The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility and are basically comprised of ce |
| 5791380 |
Methods of forming insulated pipeline bundles |
August 11, 1998 |
| Methods of forming highly insulated pipeline bundles made up of one or more flow lines positioned within a continuous larger diameter outer sleeve are provided. The methods basically comprise the steps of filling the space between the outside of the flow lines and the inside of the outer |
| 5789352 |
Well completion spacer fluids and methods |
August 4, 1998 |
| A well completion spacer fluid is provided which is particularly suitable for separating a cement slurry from drilling fluid in primary cementing operations. The well completion spacer fluid is also useful for separating other potentially incompatible fluids in the wellbore, such as, sep |
| 5775433 |
Coiled tubing pulling tool |
July 7, 1998 |
| An improved coiled tubing pulling tool and methods of using the pulling tool for pulling a well tool from a well bore, relocating a well tool in the well bore and performing other similar operations. The pulling tool is basically comprised of an elongated inner mandrel having an axial fl |
| 5775421 |
Fluid loss device |
July 7, 1998 |
| A fluid loss device has a housing, a seal assembly, a running tool, and a plug. The housing of the fluid loss device is placed in a production string before a well bore is completed. The plug is attached to the running tool, and the running tool is attached to a wash pipe.The fluid loss |
| 5767671 |
Method of testing the lifeline of coiled tubing |
June 16, 1998 |
| To test coiled tubing, at least one test is performed on a coiled tubing that has been used, such as in an oil or gas well. Performing such test includes obtaining a specific output data event (e.g., a nondestructive evaluation test readout) for the used coiled tubing. The specific outpu |
| 5762142 |
Coiled tubing apparatus |
June 9, 1998 |
| The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. A packer member is releasably connected to the connector member. The packer member includes a pack-off element and slips for |
| 5762139 |
Subsurface release cementing plug apparatus and methods |
June 9, 1998 |
| The present invention provides an improved subsurface release cementing plug apparatus for use in a string of pipe during the cementing of the pipe in a well bore. The apparatus includes a hollow cementing plug seat member adapted to be connected in the string of pipe near the bottom |
| 5738463 |
Elastomeric grouting of subsurface conduits |
April 14, 1998 |
| The present invention provides methods of grouting a subsurface conduit whereby the hardened grout resists stress failures. The methods basically comprise the steps of forming a hardenable grout composition having elastomeric properties upon hardening, placing the hardenable grout co |
| 5738171 |
Well cementing inflation packer tools and methods |
April 14, 1998 |
| The present invention provides an improved cementing inflation packer tool and methods of using the tool. The tool includes of a tubular housing having a packer inflating port disposed therein and a packer inflating port opening sleeve slidably disposed within the housing. The opening |
| 5722491 |
Well cementing plug assemblies and methods |
March 3, 1998 |
| An improved well cementing plug assembly adapted to be connected to a string of drill pipe or a circulation tool for use in a pipe during the cementing of the pipe in a well bore is provided. The top and bottom plugs are selectively releasable by activating balls dropped into the plug |
| 5720343 |
High temperature, high pressure retrievable packer |
February 24, 1998 |
| In a retrievable packer adapted for service under high temperature and high pressure operating conditions, the packer is purpose-designed as a cut-to-release packer. That is, this retrievable packer has no built-in release mechanism. An internal cinch slip is used to retain the packer in |
| 5718292 |
Inflation packer method and apparatus |
February 17, 1998 |
| An inflation packer method and apparatus comprising at inflatable packer bladder and an inflation fluid. The packer apparatus further comprises a packer mandrel having a central flow passage therethrough and an outer packer body which includes the inflatable packer bladder. A chemical |
| 5718287 |
Apparatus for downhole injection and mixing of fluids into a cement slurry |
February 17, 1998 |
| An apparatus for downhole injection and mixing of fluids into a cement slurry. The apparatus includes embodiments which either carry a fluid to the proper injection point in a wellbore or maintain it at the proper injection point until activated. In a first embodiment, the apparatus is |
| 5716910 |
Foamable drilling fluid and methods of use in well drilling operations |
February 10, 1998 |
| A foamable drilling fluid for use in well operations such as deep water offshore drilling where risers are not employed in returning the fluid to the surface mud pit. A preferred foamable drilling fluid comprises a prehydrated clay such as bentonite, sea water, a surfactant selected from |
| 5712631 |
Intrinsically safe data network |
January 27, 1998 |
| An intrinsically safe data network, such as one defining a system for acquiring and transferring data from inside a hazardous zone at an oil or gas well to outside the hazardous zone, includes a fixed number of at least one data signal conductor and a fixed number of at least one int |
| 5711383 |
Cementitious well drilling fluids and methods |
January 27, 1998 |
| The present invention provides cementitious well drilling fluids and methods of drilling subterranean well bores. The drilling fluids are basically comprised of water, a water viscosity increasing material and a cementitious material which when deposited on the walls of the well bore |
| 5711375 |
Well stabilization tools and methods |
January 27, 1998 |
| The present invention relates to tools and methods for stabilizing incompetent or otherwise unstable subterranean zones or formations penetrated by a well bore during drilling. The methods basically comprise drilling the well bore through an unstable subterranean zone or formation wh |
| 5704393 |
Coiled tubing apparatus |
January 6, 1998 |
| The apparatus and method for injecting coiled tubing downhole includes a connector member disposed on the end of the coiled tubing and supporting a downhole tool. The connector member includes a dual check valve in the fluid passageway which allows fluid passage to actuate the packer mem |
| 5701959 |
Downhole tool apparatus and method of limiting packer element extrusion |
December 30, 1997 |
| An improved downhole tool apparatus and method for limiting the extrusion of packer element seals of packers and bridge plugs which utilize segmented packer retaining shoes when such tools are of larger diameters, or when used at elevated differential pressures or elevated temperatures. |
| 5701957 |
Well perforator isolation apparatus and method |
December 30, 1997 |
| Disclosed is an improved apparatus and method for performing downhole operations to a subterranean formation while isolating the formation from the remainder of the well bore. The invention utilizes a tool assembly which initially sets a packer above the formation while allowing a do |
| 5697442 |
Apparatus and methods for use in cementing a casing string within a well bore |
December 16, 1997 |
| The present invention provides an apparatus in the form of a float shoe or collar for use in cementing a casing string within a well bore. The shoe or collar has blades extending therefrom for centering the shoe or collar, as well as the lower end of the casing string, within the well bo |
| 5696059 |
Methods of preventing well cement stress failure |
December 9, 1997 |
| Improved methods of cementing in a well are provided whereby stress failures in the resulting set cement are prevented or reduced. The methods basically comprise the steps of placing a foamed cement composition in a zone in the well to be cemented which when set has sufficient elastic |
| 5688844 |
Resilient well cement compositions and methods |
November 18, 1997 |
| The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility and are basically comprised of ce |
| 5676208 |
Apparatus and methods of preventing screen collapse in gravel packing operations |
October 14, 1997 |
| A gravel packing apparatus and associated method of gravel packing a subterranean well prevents screen collapse without requiring sealing engagement of a washpipe with an external seal, without requiring reliance solely on differential pressure, and without utilizing a reciprocating |
| 5672203 |
Set retarded cementing compositions and methods |
September 30, 1997 |
| The present invention provides set retarding additives, set retarded hydraulic cement compositions and methods of using the set retarded cement compositions for cementing subterranean zones in wells. A preferred set retarding additive comprises an alkanolamine salt produced by the reacti |
| 5662341 |
Metal-to-metal seal assembly for oil and gas well production apparatus |
September 2, 1997 |
| A metal-to-metal seal assembly which provides a dynamic seal between two moving members yet does not require constant compressive loading. A hollow seal ring is provided having a "C"-shaped cross section and containing a coiled spring. The seal ring is disposed between two telescoped mem |
| 5656930 |
Method for determining the anisotropic properties of a subterranean formation consisting of a th |
August 12, 1997 |
| Formation anisotropic properties are determined using knowledge of the borehole dip angle and an induction logging instrument to obtain two formation derived resistivities. Separate shale layer anisotropic properties are further determined utilizing the logging instrument in a like m |
| 5649597 |
Differential pressure test/bypass valve and method for using the same |
July 22, 1997 |
| A well tool apparatus (40) comprising a tubular housing (56) and operating mandrel (58) each having autofill ports (74, 76) and bypass ports (128, 130) therein. The well tool apparatus (40) also comprising a normally closed ball valve (96) rotatably disposed within the operating mandrel |
| 5647434 |
Floating apparatus for well casing |
July 15, 1997 |
| Floating apparatus for well casing including a check valve disposed in a sleeve, wherein the sleeve is receivable within an outer case. In the case of a float collar, the outer case comprises coupled upper and lower casing string sections; while in the case of a float shoe, the outer cas |
