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| Number | Title | Issue Date |
| 5653287 | Cryogenic well stimulation method Hydrocarbon fluid recovery from wells extending into subterranean formations is stimulated by treatment of the near-wellbore formations with cryogenic liquid.... | 08/05/1997 |
| 5636693 | Gas well tubing flow rate control Gas in association with liquids is produced from a wellbore by disposing a first tubing string having a first fluid communication path into the wellbore to near or below the bottom of a producing zone, disposing within the annulus between the first tubing... | 06/10/1997 |
| 5632348 | Fluid activated detonating system A fluid actuated detonating device is shown being used to activate explosive devices in a borehole. The detonating device has an explosive detonation charge arranged in a housing wherein a rupture disc in the wall of the housing separates the explosive ch... | 05/27/1997 |
| 5474601 | Integrated floating platform vertical annular separation and pumping system for production of hydrocarbons A VASPS (vertical annular separation and pumping system) is integral with a floating production vessel such as a TLP. The head section of the VASPS is located at the deck level of the vessel. The tail section is located at or near the bottom of the body o... | 12/12/1995 |
| 5464061 | Cryogenic coal bed gas well stimulation method Methane gas recovery from wells extending into subterranean coal seams is stimulated by treatment of near-wellbore coal seam with cryogenic liquid.... | 11/07/1995 |
| 5411104 | Coalbed methane drilling A system for drilling low rate coalbed formations wherein the formation has anisotropic fracture characteristics which create low permeability (high volatile B bituminous rank or lower). Typically these coalbeds have vitrinite reflectance less than 0.78 R... | 05/02/1995 |
| 5379838 | Apparatus for centralizing pipe in a wellbore A system for centralizing casing pipe in a wellbore includes lateral pistons in the side wall of the casing string which are movable by force applied to their inner end, from a retracted position within the maximum exterior profile of the casing pipe stri... | 01/10/1995 |
| 5348096 | Anisotropic composite tubular emplacement An anisotropically tailored tubular (fabricated of a composite having an unsymmetrical bias of the reinforcing components of the composite and an elasticity of the matrix thereof such that at least one of compression stress along the long axis of the tubu... | 09/20/1994 |
| 5346016 | Apparatus and method for centralizing pipe in a wellbore A system for centralizing casing pipe in a wellbore includes lateral pistons in the side wall of the casing string which are movable by forces applied to their inner end, from a retracted position within the maximum exterior profile of the casing pipe str... | 09/13/1994 |
| 5285204 | Coil tubing string and downhole generator A borehole system for operating a downhole generator suspended on a composite coiled tubing string. The coiled tubing has at least two separate longitudinal chambers to provide separate flow paths. A fluid is pumped from the surface through one flowpath t... | 02/08/1994 |
| 5234058 | Composite rod-stiffened spoolable cable with conductors Well tools are run into a well, usually a deviated well, using a composite wireline cable made up of a bundle of parallel slidable composite rods and electrical or optical conductors covered with a flexible protective sheath. The cable is stored on a spoo... | 08/10/1993 |
| 5201848 | Deep well electrical submersible pump with uplift generating impeller means An electrical downhole centrifugal pump for pumping fluids from a deep well includes a relatively small diameter pump housing which is suspended from a tubing string and including a series of impellers and diffusers. The impellers are mounted on a vertica... | 04/13/1993 |
| 5195587 | Vapor recovery system In an oilfield production system, a water driven jet pump is used to evacuate vapors from storage tanks to thereby recover the vapors and prevent emissions from passing to the atmosphere. The jet pump entrains the vapors in process water which is passed t... | 03/23/1993 |
| 5172765 | Method using spoolable composite tubular member with energy conductors An electrical cable in which composite rods and electrical conductors disposed between a flexible, elongated, membrane which can be pressurized and a flexible outer protective sheath surrounding but separate from the membrane, provide a pressure stiffened... | 12/22/1992 |
| 5165478 | Downhole activated process and apparatus for providing cathodic protection for a pipe in a wellbore This invention relates to a downhole activated device for providing cathodic protection for pipes in a wellbore for the production of hydrocarbons. The downhole activated devices are carried within either the pipe casing or the collars or both and remain ... | 11/24/1992 |
| 5129468 | Method and apparatus for separating drilling and production fluids In a drilling system where production fluids are produced during the drilling operation, a brine solution is used to prevent development of a filter cake on the formation and thereby in the absence of such filter cake, allow production to occur. A separat... | 07/14/1992 |
| 5110471 | High efficiency liquid/liquid hydrocyclone A high efficiency small diameter hydrocyclone for separating liquid/liquid constituents of a mixture. An effective separation portion Le of the hydrocyclone separation chamber begins at a small diameter throat DT where acceleration a... | 05/05/1992 |
| 5108608 | Cyclone separator with multiple outlets and recycling line means A hydrocyclone separator for separating oil and water components of a fluid mixture to provide a more dense water component that is substantially free of oil, having three outlets at the end of the hydrocyclone opposite the inlet end. One of the outlets r... | 04/28/1992 |
| 5100552 | Cyclone separator with enlarged underflow section A cyclone separator with an inlet and two outlets for separating oil and water from an oil-water mixture wherein the separation chamber has a large diameter inlet end and a smaller diameter underflow outlet end, and is generally comprised of first, second... | 03/31/1992 |
| 5093006 | Liquid separator Liquid separator and method of separating oil and water components of a liquid mixture wherein the oil component is made up of droplets of a less dense phase in a more dense water phase, using a hydrocyclone for separating the components. A less dense com... | 03/03/1992 |
| 5071556 | Hydrocyclone having a high efficiency area to volume ratio A high efficiency hydrocyclone for separating a dispersed liquid phase from a continuous liquid phase in a mixture includes a separation chamber having an effective separation portion Le that begins where the slope or curve of the portion is le... | 12/10/1991 |
| 5071557 | Liquid/liquid hydrocyclone A high efficiency hydrocyclone for separating liquid constituents of a mixture wherein one constituent is a dispersed phase in another continuous phase constituent. The separation chamber of the hydrocyclone is configured such that a first steep tapered o... | 12/10/1991 |
| 5055202 | Method and apparatus for maintaining predetermined cyclone separation efficiency For separating an oil and water mixture, the mixture is applied to the inlet of a cyclone separator so that the oil emerges from an overflow outlet and the water from an underflow outlet. Sensors measure the purity of the separated water and oil component... | 10/08/1991 |
| 5049277 | Cyclone separator Cyclone separator for separating liquid components from a liquid mixture, having an axially extending separating chamber (12) with an underflow outlet (22) for outlet of more dense components at one end thereof and an overflow outlet (18) for outlet of le... | 09/17/1991 |
| 5037558 | Liquid separator Liquid separator including a liquid-liquid hydrocyclone (10) and a method for enhancing the operation of the liquid-liquid hydrocyclone in which the mixture to be separated is first passed through a mixing and/or residence vessel (90), such as a cross pla... | 08/06/1991 |
| 5032275 | Cyclone separator A cyclone separator comprising at least a primary portion having generally the form of a volume of revolution and having a first end and a second end, the diameter at said second end being less than at said first end, at least one inlet, the or each said ... | 07/16/1991 |
| 5021165 | Oil and water separating system with hydrocyclone and floatation device A separation system for separating oil and water components of a liquid mixture wherein the oil component is comprised of droplets of a less dense phase in a more dense water phase. The mixture is fed to separation devices including a hydrocyclone for gen... | 06/04/1991 |
| 5017288 | Cyclone separator A cyclone separator (10) of the dewatering type which comprises an elongated separating chamber (12) having an axis of symmetry between opposite first and second ends, the separating chamber being of greater cross-sectional dimension at the first end than... | 05/21/1991 |
| 5009785 | System and apparatus for the separation of multi-phase mixture Apparatus for separating multi-phase liquid mixtures or at least partially separating a more dense liquid component of the mixture from a less dense liquid component thereof. An outer casing has a cavity therein, an intake port through which the mixture i... | 04/23/1991 |
| 5009784 | Cyclone separator with oppositely directed separating chambers A cyclone separator for separating components of a liquid mixture including oil and water phases has oppositely disposed separating chambers with a common intermediate portion positioned between the separating chambers which provides a common inlet and in... | 04/23/1991 |
| 4995989 | Separating liquids Apparatus (100) for separating components of a liquid mixture such as oil from water. The apparatus comprises a cyclonic device (110) and a separating device (150). The cyclonic device has a tangential inlet (112) for inlet of the mixture, an elongate cha... | 02/26/1991 |
| 4983283 | Cyclone separator A cyclone separator comprising an elongated separating chamber having a longitudinal axis of symmetry between opposite first and second ends, the separator including at least one feed inlet (3) adjacent the first end and at least two outlets (4), (5), the... | 01/08/1991 |
| 4980064 | Cyclone separator with enlarged underflow section A cyclone separator with an inlet and two outlets for separating oil and water from an oil-water mixture wherein the separation chamber has a large diameter inlet end and a smaller diameter underflow outlet end. The overflow is arranged as an axial outlet... | 12/25/1990 |
| 4976872 | Cyclone separator A cyclone separator for separating a denser liquid component from a less dense liquid component of a multi-phase liquid mixture wherein one phase is in the form of drops dispersed in the other phase, the separator having an elongated, unobstructed separat... | 12/11/1990 |
| 4953956 | Liquid prism device An optical device including a fluid filled prism that has flexible side wall portions to provide a variable lens system in conjunction with the prism. The device has translucent side walls formed in a trough shape with an open top side for conveniently ch... | 09/04/1990 |
| 4933094 | Method and apparatus for separating liquid components from a liquid mixture Method and apparatus for separating oil-water mixtures in which the oil is present as droplets so as to comprise the disperse phase, the mean droplet size being greater than 56.7 micron, using a cyclone separator having a swirl coefficient, S, in the rang... | 06/12/1990 |
| 4932810 | Corrosion protection system for a pipeline crossing In a pipeline crossing, a carrier pipeline is annularly surrounded by a casing with the ends of the casing vented to the surface and sealed with the periphery of the pipeline to minimize corrosion of the pipeline wall. Access and pressure relief valves ar... | 06/12/1990 |
| 4840618 | Medical safety device The particular embodiment described herein as illustrative of one form of the invention incorporates a round elongated handle sized for holding in the fisted grip of a person. A shield is positioned on top of the handle and extends radially outwardly ther... | 06/20/1989 |
| 3935642 | Directional drilling of bore holes For the directional drilling of boreholes, the orientation or roll angle of the drill head or mud-motor in the borehole has to be ascertained for steering purposes. The roll angle is determined, during drilling, by sensing at the location of the drilling ... | 02/03/1976 |
