| 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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| 08/02/1983 | US4396074 Drill bit extension for sidewall corer |
| 08/02/1983 | US4396062 Apparatus and method for time-domain tracking of high-speed chemical reactions |
| 07/26/1983 | US4395061 Swivel unit |
| 07/19/1983 | USRE31313 Method and system for well testing |
| 07/19/1983 | US4393933 Determination of maximum fracture pressure |
| 07/19/1983 | US4393689 Device for determining physical characteristics of a fluid, such as its liquid-vapor equilibrium pressure |
| 07/12/1983 | US4392377 Early gas detection system for a drill stem test |
| 06/28/1983 | US4390973 Method for determining the extent of subsurface reaction involving acoustic signals |
| 06/28/1983 | US4389896 Borehole gauge for in-situ measurement of stress and other physical properties |
| 06/21/1983 | US4388968 Downhole tool suction screen assembly |
| 06/07/1983 | US4386655 Downhole pump with floating seal means |
| 06/07/1983 | CA1147697A1 Method for maintaining present parameters of drilling mud |
| 05/31/1983 | US4385666 Method of maintaining preset parameters of drilling mud |
| 05/10/1983 | US4382335 Head assembly for multiposition borehole extensometer |
| 04/26/1983 | CA1145323A2 Systems, apparatus and methods for measuring while drilling |
| 04/26/1983 | CA1145250A1 Check valve assembly |
| 04/20/1983 | EP0077275A2 Pump-down stinger assembly method and apparatus |
| 04/20/1983 | EP0076912A2 Apparatus for testing earth formations |
| 04/12/1983 | CA1144475A1 Well test apparatus |
| 03/29/1983 | US4378055 Analyzing for helium in drilling muds to locate geothermal reservoirs |
| 03/22/1983 | CA1143365A1 Continuous borehole-logging method |
| 03/22/1983 | CA1143279A1 Method and system for well testing |
| 03/09/1983 | EP0073196A1 Fluid operated diaphragm pump |
| 03/01/1983 | US4375164 Formation tester |
| 03/01/1983 | CA1142080A1 Sidewall sampling apparatus |
| 02/22/1983 | CA1141656A1 Apparatus for and method of operating a well |
| 02/08/1983 | US4372387 Downhole tool with ratchet |
| 02/08/1983 | US4372382 Method and sampler for collecting a non-pressurized well fluid sample |
| 02/08/1983 | US4372380 Method for determination of fracture closure pressure |
| 02/01/1983 | US4370886 In situ measurement of gas content in formation fluid |
| 01/25/1983 | US4370146 Infrared absorption determination of sulfonate surfactants utilizing deuterated sulfonates |
| 01/25/1983 | US4369842 Analyzing oil shale retort off-gas for carbon dioxide to determine the combustion zone temperature |
| 01/25/1983 | US4369655 Method of determining the concentration of solid lubricants in drilling fluids |
| 01/25/1983 | US4369654 Selective earth formation testing through well casing |
| 01/11/1983 | CA1139369A1 Method and apparatus for measuring the resistivity of fluids in a borehole |
| 01/11/1983 | CA1139127A1 Method and means for taking a sample from a flow of fluid passing out of a well |
| 01/05/1983 | EP0068985A2 Annulus pressure controlled reversing valve |
| 01/04/1983 | US4366862 Downhole pump and testing apparatus |
| 12/28/1982 | US4365507 Method of determining the depth of occurrence of a chemically aggressive bed |
| 12/28/1982 | CA1138416A1 Method and a machine of obtaining samples from the ground to determine its composition |
| 12/21/1982 | CA1137868A1 Oil well testing string bypass valve |
| 12/21/1982 | CA1137783A1 Method and apparatus for monitoring the position and movement progress of the flame front in an underground combustion operation |
| 12/15/1982 | EP0067096A2 Deflate-equalizing valve apparatus for inflatable packer formation tester |
| 12/14/1982 | US4363366 Screened hollow stem auger for use in well drilling and testing process |
| 12/07/1982 | CA1136985A1 Unique salinity for oil recovery surfactant system |
| 11/23/1982 | US4359901 Method for making measurements of the chemical swelling effect of a fluid on a shale |
| 11/23/1982 | CA1136035A1 Well test systems and methods |
| 11/16/1982 | US4359110 Variable-length sampling device |
| 11/09/1982 | US4357992 Fluid pressurization apparatus and technique |
| 11/02/1982 | CA1134955A1 Method for in situ determination cation exchange capacities of subsurface formations |
| 10/26/1982 | US4355997 Method for measuring the level of hydrogen sulfide in geothermal steam |
| 10/26/1982 | US4355685 Ball operated J-slot |
| 10/26/1982 | CA1134203A1 Down hole tool, including a screen assembly and a packer assembly |
| 10/19/1982 | US4354558 Apparatus and method for drilling into the sidewall of a drill hole |
| 10/19/1982 | US4354381 Sonic attenuating method for distinguishing between oil, water and gas |
| 10/12/1982 | US4353249 Method and apparatus for in situ determination of permeability and porosity |
| 10/12/1982 | US4353248 Well logging to determine the nature and extent of mud filtrate penetration |
| 10/12/1982 | US4353244 Method of determining the azimuth and length of a deep vertical fracture in the earth |
| 10/06/1982 | EP0062022A1 Device for taking ground water samples in soil and rock |
| 10/05/1982 | US4352674 Acetate concentration in mud |
| 10/05/1982 | US4352376 Controller for well installations |
| 09/14/1982 | US4349737 Determination of movable oil saturations |
| 09/14/1982 | US4348897 Method and device for determining the transmissibility of a fluid-conducting borehole layer |
| 09/14/1982 | CA1131463A1 Method of fracturation detection |
| 09/07/1982 | US4347736 Continuous borehole-logging method |
| 08/31/1982 | US4346600 Stress sensor particularly suitable for elastic, plastic and visco-elastic materials |
| 08/31/1982 | US4346592 Method for determining effective reservoir porosity |
| 08/24/1982 | US4345461 Apparatus for taking bedrock samples from bottom of deep-water basins |
| 08/17/1982 | US4344484 Determining the locus of a processing zone in an in situ oil shale retort through a well in the formation adjacent the retort |
| 08/10/1982 | US4343361 Method for controlling underground combustion |
| 08/10/1982 | US4343360 Method for controlling underground combustion |
| 08/10/1982 | CA1129335A1 Reservoir fluid sampling |
| 08/05/1982 | WO1982002573A1 Methods and apparatus for well investigation and development |
| 08/04/1982 | EP0056872A1 Method and apparatus for surveying ground |
| 08/03/1982 | US4342222 Method for the determination of depth of a fluid-saturated stratum and fluid type |
| 08/03/1982 | CA1128852A1 Determination of fracturing fluid loss rate from pressure decline curve |
| 07/27/1982 | US4341266 Pressure operated test tool |
| 07/20/1982 | US4339948 Well formation test-treat-test apparatus and method |
| 07/20/1982 | US4339947 Downhole sampling method and apparatus |
| 07/14/1982 | EP0055960A2 Full-bore well tester with hydrostatic bias |
| 07/13/1982 | CA1127712A1 Nmr analysis of subterranean reservoir samples immersed in liquid halocarbons |
| 07/06/1982 | CA1127073A1 Apparatus for drilling into the sidewall of a drill hole |
| 06/24/1982 | WO1982002074A1 Device for pressing geophysical devices against the wall of a bore hole |
| 06/22/1982 | CA1126153A1 Fluid flow restrictor valve for a drill hole coring tool |
| 06/01/1982 | US4332301 Method and a machine of obtaining samples from the ground to determine its composition |
| 06/01/1982 | US4332160 Penetrometer |
| 05/27/1982 | WO1982001738A1 Fluid operated diaphragm pump |
| 05/18/1982 | US4330402 Water sampling and disposal apparatus for an offshore operating site |
| 05/18/1982 | US4329883 Apparatus for collecting deep-sea sediment pore water |
| 05/11/1982 | US4328866 Check valve assembly |
| 05/11/1982 | US4328705 Method of determining characteristics of a fluid producing underground formation |
| 05/11/1982 | CA1123232A1 Geothermal well sampler apparatus |
| 05/04/1982 | CA1122814A1 Method of determining change in subsurface structure due to application of fluid pressure to the earth |
| 04/27/1982 | US4326409 Situ bore hole test probe |
| 04/13/1982 | US4324293 Circulation valve |
| 04/06/1982 | US4323121 By injection of gases |
| 04/06/1982 | US4323120 By injection of gases |
| 03/23/1982 | CA1120543A1 Apparatus and method for determining characteristics of subsurface formations |
| 03/16/1982 | US4319482 Gas sensor |
| 03/03/1982 | EP0046651A2 Method and apparatus for obtaining selected samples of formation fluids |