| Patents for E21B 49 - Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells (11,875) |
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| 10/02/1984 | US4474242 Annulus pressure controlled reversing valve |
| 09/25/1984 | US4473117 In an underground reservoir |
| 09/25/1984 | US4473116 Hydrocarbon-surfactant-cosurfactant system |
| 09/11/1984 | US4470456 Borehole sampling tool |
| 09/11/1984 | CA1174073A1 Methods and apparatus for well investigation and development |
| 08/28/1984 | US4467867 Subterranean well safety valve with reference pressure chamber |
| 08/28/1984 | US4467642 Method for identifying complex lithologies in a subsurface formation |
| 08/21/1984 | US4466495 Pressure core barrel for the sidewall coring tool |
| 08/14/1984 | US4465139 Valve and sensing device for well conduits |
| 08/07/1984 | US4463804 Vented non-pressurized, uncontaminated well fluid sampler |
| 08/07/1984 | US4463599 Free water volume analyzer |
| 07/31/1984 | CA1171769A1 Method for making and using measurements of the chemical swelling effect of a fluid on a shale |
| 07/24/1984 | US4461360 Bit extension guide for sidewall corer |
| 07/24/1984 | US4461172 Well monitoring, controlling and data reducing system |
| 07/24/1984 | US4461171 Method and apparatus for determining the in situ deformability of rock masses |
| 07/24/1984 | CA1171352A1 Full-bore well tester with hydrostatic bias |
| 07/17/1984 | US4460218 Characterization of in situ oil shale retorts prior to ignition |
| 07/17/1984 | US4460038 Installation for testing a well and a process for use thereof |
| 07/10/1984 | US4458762 For use in a testing string in a well bore |
| 07/10/1984 | US4458752 Downhole tool inflatable packer assembly |
| 07/10/1984 | US4458528 For the comparative measurement of tendency of drilling fluid |
| 07/10/1984 | US4458525 For determining soil compressibility |
| 07/03/1984 | US4458245 Method and apparatus for exploring earth and rocky formations |
| 07/03/1984 | US4457374 Transient response process for detecting in situ retorting conditions |
| 07/03/1984 | US4457367 Downhole pump and testing apparatus |
| 06/19/1984 | US4454773 Time interval automatic well multi-phase fluid sampler |
| 06/19/1984 | US4454772 Method for sampling a fluid from a well |
| 06/12/1984 | US4453599 Method and apparatus for controlling a well |
| 06/12/1984 | US4453595 Method of measuring fracture pressure in underground formations |
| 06/05/1984 | US4452313 Circulation valve |
| 06/05/1984 | CA1168471A1 Method and apparatus for obtaining saturation data from subterranean formations |
| 05/29/1984 | US4450717 Downhole sampling apparatus |
| 05/22/1984 | US4449593 Guide for sidewall coring bit assembly |
| 05/15/1984 | US4448254 Tester valve with silicone liquid spring |
| 05/15/1984 | CA1167372A1 Method for monitoring flood front movement during water flooding of subsurface formations |
| 05/08/1984 | US4447340 Using acetate ions |
| 05/08/1984 | CA1166871A1 Penetrometer |
| 05/01/1984 | US4445571 Circulation valve |
| 04/25/1984 | EP0106058A1 Method and apparatus for determining characteristics of clay-bearing formations |
| 04/24/1984 | US4444268 Tester valve with silicone liquid spring |
| 04/24/1984 | US4444044 Method and apparatus for determining the foaming characteristics of a crude oil stream at the wellhead |
| 04/24/1984 | CA1166075A1 Fluid-powered submersible sampling pump |
| 04/17/1984 | US4442710 Method of determining optimum cost-effective free flowing or gas lift well production |
| 04/04/1984 | EP0104993A2 Full-bore drill stem testing apparatus with surface pressure readout |
| 04/03/1984 | US4440230 Full-bore well tester with hydrostatic bias |
| 04/03/1984 | US4440032 Sampler incorporating a purge system |
| 04/03/1984 | US4440020 Well log depth zoning |
| 04/03/1984 | CA1164789A1 In situ measurement of gas content in formation fluid |
| 03/27/1984 | US4438654 Device for taking ground water samples in soil and rock |
| 03/27/1984 | CA1164268A1 Submersible pump for use in toxic and hazardous waste sampling |
| 03/20/1984 | CA1163917A1 Device for temporarily closing duct-formers in well completion apparatus |
| 03/13/1984 | US4435977 Method for locating low resistivity pay sands using well logs |
| 03/06/1984 | US4434653 Apparatus for testing earth formations |
| 03/06/1984 | CA1163324A1 Well logging to determine the nature and extent of mud filtrate penetration |
| 02/28/1984 | US4433737 Water jet sediment probe |
| 02/22/1984 | EP0101158A2 Method and apparatus for monitoring and controlling well drilling parameters |
| 02/14/1984 | US4430889 Dynamic fluid testing apparatus and method |
| 02/07/1984 | US4429748 For use in a well testing string |
| 01/24/1984 | US4426882 For sensing pressure in a well |
| 01/24/1984 | CA1160950A1 Method of determining the depth of occurrence of a chemically reactive bed |
| 01/10/1984 | US4424860 Deflate-equalizing valve apparatus for inflatable packer formation tester |
| 01/03/1984 | US4423625 Pressure transient method of rapidly determining permeability, thickness and skin effect in producing wells |
| 01/03/1984 | CA1159673A1 Formation tester |
| 12/27/1983 | US4422506 Low pressure responsive APR tester valve |
| 12/27/1983 | CA1159364A1 Pressure operated test tool |
| 12/20/1983 | US4420975 System and method for determining the relative permeability of an earth formation surrounding a wellbore |
| 12/13/1983 | US4419887 Distinguishing true basement from dikes and sills encountered in drilling of a borehole through the earth |
| 12/07/1983 | EP0095837A2 Well testing apparatus and method |
| 11/29/1983 | US4417622 Well sampling method and apparatus |
| 11/22/1983 | US4416152 Formation fluid testing and sampling apparatus |
| 11/22/1983 | US4416151 Method and apparatus for determining in situ hydrocarbon characteristics including hydrogen density |
| 11/22/1983 | CA1157459A1 Swivel unit |
| 11/08/1983 | US4413678 Alarm means for use with apparatus protecting a device situated in a borehole |
| 11/08/1983 | US4413511 System for measuring cuttings and mud carryover during the drilling of a subterranean well |
| 11/08/1983 | CA1156543A1 Method of tracing drilling mud through determination of the concentration of a soluble ion |
| 11/02/1983 | EP0092975A1 Sample receiving and mixing device |
| 11/01/1983 | US4412584 Downhole tool intake port assembly |
| 10/26/1983 | EP0092354A2 Circulation valve |
| 10/26/1983 | EP0092341A2 Recloseable auxiliary valve and a method of actuating it |
| 10/25/1983 | CA1155759A1 Well tools |
| 10/18/1983 | US4410052 Method of drilling a productive bed |
| 10/18/1983 | US4410041 Process for gas-lifting liquid from a well by injecting liquid into the well |
| 10/18/1983 | US4409825 Down hole steam quality measurement |
| 09/28/1983 | EP0089740A2 Annulus pressure responsive tester valve |
| 09/14/1983 | EP0088550A2 Tester valve with liquid spring |
| 09/14/1983 | EP0088531A2 Downhole tester valve |
| 09/06/1983 | US4402910 Continuous analysis of geothermal steam for hydrogen sulfide |
| 09/06/1983 | CA1153288A1 Method and apparatus for obtaining selected samples of formation fluids |
| 08/30/1983 | US4401169 System for lagtime measurement during drilling |
| 08/24/1983 | EP0086544A2 Bottom sampler |
| 08/23/1983 | US4399693 Applications of borehole gravimetric techniques to determine residual oil saturation |
| 08/23/1983 | CA1152628A1 Method for determining the extent of subsurface reaction involving acoustic signals |
| 08/16/1983 | US4399359 Method for monitoring flood front movement during water flooding of subsurface formations |
| 08/16/1983 | US4398416 Determination of fracturing fluid loss rate from pressure decline curve |
| 08/16/1983 | CA1151997A1 Process for stimulating a well with a saline surfactant sulfate, alkanol and acid system |
| 08/16/1983 | CA1151996A1 Determination of maximum fracture pressure |
| 08/10/1983 | EP0085665A2 Method and device for taking soil samples |
| 08/09/1983 | US4397181 Method for determining fluid saturation in a subsurface formation |
| 08/09/1983 | CA1151535A1 Circulation valve |
| 08/02/1983 | US4396838 Logging type subsidence detector |