| Patents for E21B 43 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells (64,186) |
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| 09/11/1991 | CN2084511U Phase adjustable balace device for slide beam oil pump |
| 09/10/1991 | US5046892 Apertured pipe segment |
| 09/10/1991 | US5046567 Adiabatically induced ignition of combustible materials |
| 09/10/1991 | US5046561 Application of multiphase generation process in a CO2 flood for high temperature reservoirs |
| 09/10/1991 | US5046560 Oil recovery process using arkyl aryl polyalkoxyol sulfonate surfactants as mobility control agents |
| 09/10/1991 | US5046559 Method and apparatus for producing hydrocarbon bearing deposits in formations having shale layers |
| 09/05/1991 | WO1991013237A1 Drag analysis method |
| 09/05/1991 | WO1991013236A1 Method and system for underground gasification of coal or browncoal |
| 09/05/1991 | WO1991013233A1 Releasable hydraulic and/or electric connection for subsea equipment |
| 09/05/1991 | WO1991012893A1 Improvements relating to hydrocyclone systems |
| 09/04/1991 | EP0444974A1 Method and device for the replacement of underground pipelines |
| 09/04/1991 | EP0444760A1 Enhanced methane production from coal seams by dewatering |
| 09/04/1991 | EP0444170A1 Process for making general use of the earth's heat and obtaining minerals in the zone of weakness (at depths of 13-30 km). |
| 09/04/1991 | CN1054287A Method for determining transit time for radioactive tracer |
| 09/04/1991 | CN1013784B Fully hydraulic oil pump |
| 09/04/1991 | CN1013782B Sucker rods of gear or rack form underground extended-range device |
| 09/04/1991 | CN1013781B Well penetration apparatus and method |
| 09/03/1991 | US5045220 Adding a polymer such as polysiloxane or polyvinyl ether and a cosolvent, enhanced oil recovery |
| 09/03/1991 | US5044672 Metal-to-metal sealing pipe swivel joint |
| 09/03/1991 | US5044441 Pack-off well apparatus and method |
| 09/03/1991 | US5044440 Underwater station for pumping a well flow |
| 09/03/1991 | US5044437 Method and device for performing perforating operations in a well |
| 09/03/1991 | US5044436 Steam injection profiling with unstable radioactive isotopes |
| 09/03/1991 | US5044435 Enhanced oil recovery using denitrifying microorganisms |
| 09/03/1991 | US5044433 Pack-off well apparatus with straight shear release |
| 09/03/1991 | US5044388 Perforating gun pressure bleed device |
| 09/03/1991 | CA1288372C Amphiphilic phase behavior separation of carboxylic acids/hydrocarbon mixtures in recovery of oil from tar sands or the like |
| 09/02/1991 | CA2037454A1 Method of enhancing methane production from coal seams by dewatering |
| 08/29/1991 | DE4005574A1 Ground water extraction well - has suction pipe ending below level raised by vacuum generated in shaft |
| 08/28/1991 | CN2083628U Energy-storage type hydraulic pulse vibrator |
| 08/28/1991 | CN2083625U 连续冲砂装置 Continuous sand washing equipment |
| 08/27/1991 | US5043149 Slurrying tailing with sodium (bi)carbonate; settling; removing liquids |
| 08/27/1991 | US5042594 Apparatus for arming, testing, and sequentially firing a plurality of perforation apparatus |
| 08/27/1991 | US5042593 Hydraulically damped detonator for use in perforating oil well tubing |
| 08/27/1991 | US5042584 Injecting liquids |
| 08/27/1991 | US5042583 Injecting additional amount of water into wells to generate a foam and increase pressure |
| 08/27/1991 | US5042582 Horizontal heater/treater and/or vapor tight oil battery |
| 08/27/1991 | US5042581 Method for improving steam stimulation in heavy oil reservoirs |
| 08/27/1991 | US5042580 Oil recovery process for use in fractured reservoirs |
| 08/27/1991 | US5042579 Method and apparatus for producing tar sand deposits containing conductive layers |
| 08/27/1991 | US5042297 Well-logging process and device in a non-flowing production well |
| 08/27/1991 | CA1288043C Conductively heating a subterranean oil shale to create permeabilityand subsequently produce oil |
| 08/22/1991 | WO1991012410A1 Pipework for constructing a ground water measuring point |
| 08/22/1991 | WO1991012409A1 Process and device for removing incrustation deposit in fountains |
| 08/21/1991 | EP0442814A2 Safe arm system for a perforating apparatus having a transport mode, an electric contact mode and an armed mode |
| 08/21/1991 | EP0442767A1 Method and apparatus for treating a natural gas |
| 08/21/1991 | EP0442454A1 Method and apparatus for removing wastes from sub-soil formations in the ground |
| 08/21/1991 | EP0442408A2 Device for sealing a steam injection pipe in an oil layer |
| 08/21/1991 | CN1053940A Sealing apparatus of steam tube through to oil bearing stratum in borehole |
| 08/21/1991 | CA2076008A1 Releasable hydraulic and/or electric connection for subsea equipment |
| 08/20/1991 | US5040619 Wireline supported perforating gun enabling oriented perforations |
| 08/20/1991 | US5040608 Anchorable pack-off assembly and method of seating the same |
| 08/20/1991 | US5040607 Production system for subsea oil wells |
| 08/20/1991 | US5040601 Horizontal well bore system |
| 08/20/1991 | US5040599 Using coke and sodium bentonite as backfill material impervious to water |
| 08/20/1991 | US5040597 Well apparatus including a pump and a firing head adapted to be inserted into a tubing which includes a perforating gun |
| 08/20/1991 | US5040558 Low thermal stress steam distribution manifold |
| 08/20/1991 | US5040283 Method for placing a body of shape memory metal within a tube |
| 08/20/1991 | CA1287773C Screw pump drive |
| 08/16/1991 | CA2036364A1 Method and apparatus for the decontamination of formations below ground level |
| 08/15/1991 | CA2036116A1 Acoustic flow stimulation method and apparatus |
| 08/14/1991 | EP0441464A2 In situ soil decontamination method and apparatus |
| 08/14/1991 | CN2082760U Well head fine filter filtering element of water injection well |
| 08/14/1991 | CN2082759U Preset type hydraulic loose beam oil pump |
| 08/14/1991 | CN2082758U Single-flow production sharing device of oil producing pipe column |
| 08/14/1991 | CN2082757U Roller type long stroke hydraulic oil pumping unit |
| 08/14/1991 | CN1053824A Multipurpose well head device for low temp. ground heat |
| 08/14/1991 | CN1013506B Method for placing body of shape memory metal within tubing |
| 08/13/1991 | US5039432 Copolymers of (meth) acrylic acid esters as flow improvers in oils |
| 08/13/1991 | US5038860 Hydraulically actuated liner hanger |
| 08/13/1991 | CA2036077A1 Assembly for introducing steam into an oil-bearing stratum |
| 08/13/1991 | CA1287568C Flexible riser system |
| 08/13/1991 | CA1287565C Gravel pack method and device for horizontal wellbores |
| 08/12/1991 | CA2009782A1 In-situ tuned microwave oil extraction process |
| 08/09/1991 | CA2009764A1 Method and apparatus for shale gas recovery |
| 08/08/1991 | WO1991011736A1 Apparatus for inductively coupling signals between a downhole sensor and the surface |
| 08/07/1991 | EP0440487A2 Plug apparatus and method for cementing a liner in a well bore |
| 08/07/1991 | EP0440320A1 Pumping system |
| 08/06/1991 | US5037240 In-situ soil treatment process |
| 08/06/1991 | US5036920 Gravel pack well completion with auger-screen |
| 08/06/1991 | US5036919 Fracturing with multiple fluids to improve fracture conductivity |
| 08/06/1991 | US5036918 Method for improving sustained solids-free production from heavy oil reservoirs |
| 08/06/1991 | US5036917 Method for providing solids-free production from heavy oil reservoirs |
| 08/06/1991 | US5036915 Controlling ph |
| 08/06/1991 | CA1287315C Process for the preparation of an aqueous solution of a heteropolysaccharide |
| 08/03/1991 | CA2033932A1 Perforating gun assembly and universal perforating charge clip apparatus |
| 08/02/1991 | CA2034852A1 Process and device for replacing an underground pipe |
| 08/01/1991 | CA2035289A1 Plug apparatus and method for cementing a liner in a well bore |
| 08/01/1991 | CA2009144A1 Process and system for recovering oil from oil bearing soil such as shale and tar sands and oil produced by such process |
| 07/31/1991 | EP0438455A1 Arrangement for protecting components in subsea systems. |
| 07/31/1991 | CN2081882U Wholle-soaked oil extracting unit of single-screw-arbor submersible oil pump |
| 07/31/1991 | CN1053469A Oil-well electrothermic band |
| 07/30/1991 | WO1991011587A1 Method and apparatus for sealing pipe perforations |
| 07/30/1991 | US5036099 Anhydrous, crystalline sodium salt of 5-chloro-3-(2-thenoyl)-2-oxindole-1-carboxamide |
| 07/30/1991 | US5035922 Covering pipe with slippery coating or surface comprising a hydrophilic polymer which is reacted with a polyol |
| 07/30/1991 | US5035285 Electrically conductive |
| 07/30/1991 | US5035149 Soil solution sampler |
| 07/30/1991 | US5035146 Method and apparatus for determining steam quality and/or flow rate from impact force and flow restriction data |
| 07/30/1991 | CA2049974A1 Method and apparatus for sealing pipe perforations |
| 07/30/1991 | CA1287043C Screen placement method and apparatus |