| 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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| 11/04/1980 | US4231426 Method of using tracer fluids for enhanced oil recovery |
| 10/28/1980 | US4230180 Isolating packer units in geological and geophysical measuring casings |
| 10/21/1980 | US4229181 Method for determining oil-related characteristics of geological sediments from small samples thereof |
| 10/14/1980 | CA1087516A1 Determining residual oil saturation following flooding |
| 10/07/1980 | US4226288 Side hole drilling in boreholes |
| 10/02/1980 | WO1980002053A1 Method of continuous logging of borehole |
| 10/02/1980 | WO1980002052A1 Method for determining the depth of occurrence of chemically aggressive stratum |
| 10/02/1980 | WO1980002050A1 Method for determining the depth of occurrence of fluid saturated stratum and the type of fluid |
| 10/02/1980 | WO1980002040A1 Method of controlling the quality of drilling mud |
| 10/02/1980 | WO1980002038A1 Method of maintaining preset parameters of drilling mud |
| 09/30/1980 | US4224988 Device for and method of sensing conditions in a well bore |
| 09/23/1980 | US4223726 Determining the locus of a processing zone in an oil shale retort by effluent water composition |
| 09/23/1980 | US4223725 Method for reservoir fluid drift rate determination |
| 09/23/1980 | CA1086220A1 Oil well testing valve with liquid spring |
| 09/16/1980 | US4222988 Heater to vaporize, mill to shear |
| 09/16/1980 | US4222438 Reservoir fluid sampling method and apparatus |
| 09/02/1980 | US4220212 Apparatus for monitoring the operation of well bore guns |
| 08/05/1980 | CA1083132A1 Method and system for determining formation porosity |
| 07/22/1980 | US4213762 Determination of chromate ion in drilling mud filtrates |
| 07/15/1980 | CA1081606A1 Process for determining the location and/or extent of rock cavities, especially of artificially generated rock cracks |
| 07/10/1980 | WO1980001413A1 Device for taking samples of bed-rocks from bottom of deep-water reservoirs |
| 07/09/1980 | EP0013224A1 Method and apparatus for measuring the resistivity of fluids in a borehole |
| 07/01/1980 | US4210868 Method for detecting an underground flame front using resistance probes |
| 07/01/1980 | US4210867 Induction coil method for detecting underground flame fronts |
| 07/01/1980 | US4210025 Pneumatic compensator for a fluid sampling cell |
| 07/01/1980 | US4210018 Formation testers |
| 06/24/1980 | US4208906 Mud gas ratio and mud flow velocity sensor |
| 05/28/1980 | EP0011578A1 Method and apparatus for measuring the hardness of rock in a borehole |
| 05/27/1980 | US4204426 Measuring casing coupler apparatus |
| 05/20/1980 | CA1078080A1 Method and apparatus for well logging |
| 05/20/1980 | CA1077830A1 Apparatus for testing earth formations |
| 05/20/1980 | CA1077829A1 Apparatus and methods for testing earth formations |
| 05/06/1980 | CA1076955A1 Full flow bypass valve |
| 04/22/1980 | US4199026 Method for detecting underground conditions |
| 04/15/1980 | CA1075491A1 Device for taking bottom soil samples from deep water basins |
| 04/08/1980 | US4196619 Geological assessment probe |
| 03/11/1980 | US4192182 Method for performing step rate tests on injection wells |
| 03/11/1980 | US4192181 Casing assembly probes |
| 02/12/1980 | CA1071534A1 Method and apparatus for tapping groundwater |
| 01/22/1980 | US4184548 Method for determining the position and inclination of a flame front during in situ combustion of an oil shale retort |
| 01/08/1980 | CA1069584A1 Measuring reservoir oil for saturation |
| 01/01/1980 | US4181176 Oil recovery prediction technique |
| 12/04/1979 | US4176716 Method and apparatus for tapping groundwater |
| 11/20/1979 | US4174629 Detection of drilling oil filtrate invasion in a core |
| 11/14/1979 | EP0005273A1 Apparatus and method for removing hydrocarbons from drill cuttings |
| 10/30/1979 | CA1065248A1 Oil recovery fluids selected using nuclear magnetic resonance measurements |
| 10/23/1979 | US4171642 Fluid producing formation tester |
| 09/11/1979 | US4167213 Method for determining the position and inclination of a flame front during in situ combustion of a rubbled oil shale retort |
| 09/11/1979 | US4167111 Borehole geological assessment |
| 09/04/1979 | US4166721 Monitoring concentration of component at selected locations |
| 09/04/1979 | CA1061707A1 Stroke actuated well testing tool |
| 07/10/1979 | US4160622 Portable water sampling apparatus |
| 06/26/1979 | US4158963 Process for determining the location and/or extent of rock cavities |
| 06/26/1979 | US4158957 Method for determining the fluid saturation of an immobile phase in a reservoir |
| 06/12/1979 | US4158165 Apparatus and method for determining subsurface formation properties |
| 06/12/1979 | CA1056454A1 Tracing flow of petroleum in underground reservoirs |
| 06/12/1979 | CA1056303A1 Method of underground gasification of a coal bed |
| 06/05/1979 | US4157283 Sulfide monitoring system and method |
| 05/22/1979 | US4155403 Analyzing fluid flux in formation |
| 05/22/1979 | CA1054911A1 Method for determining gas saturation in reservoirs |
| 05/22/1979 | CA1054910A1 Method of determining the relation between fractional flow and saturation of oil |
| 05/15/1979 | US4154660 Ion selective electrodes, measuring electrochemical potentials |
| 05/15/1979 | US4154659 Ionic selective electrodes to ionic concentration, determining ion ratio |
| 05/08/1979 | US4153415 Pyrolysis |
| 04/17/1979 | US4149805 Method and apparatus for measuring kerogen content of oil shale |
| 04/17/1979 | US4149804 Method and apparatus for measuring chemical content of core samples |
| 04/17/1979 | US4149409 Borehole stress property measuring system |
| 04/10/1979 | CA1052262A1 Weight and pressure operated well testing apparatus and its method of operation |
| 03/27/1979 | CA1051416A1 Core and cuttings automatic recovery system |
| 03/20/1979 | US4144937 Valve closing method and apparatus for use with an oil well valve |
| 02/13/1979 | CA1048403A1 Well logging pad devices having differential pressure relief |
| 12/19/1978 | US4130010 Bubble detector |
| 12/19/1978 | CA1044596A1 Method and apparatus for a pressure controlled reversing valve |
| 11/21/1978 | CA1042785A1 Pressure operated isolation valve for use in a well testing apparatus and its method of operation |
| 11/14/1978 | US4125165 Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means |
| 11/07/1978 | US4124800 Method for determining residual oil saturation of a formation |
| 11/07/1978 | US4124475 Hydrogen sulfide monitoring system |
| 11/07/1978 | US4123937 Methods of determining well characteristics |
| 09/12/1978 | US4113018 Oil well testing safety valve |
| 09/12/1978 | US4113012 Reclosable circulation valve for use in oil well testing |
| 09/12/1978 | CA1038285A2 Method and apparatus for testing wells |
| 09/12/1978 | CA1038284A2 Method and apparatus for testing wells |
| 09/12/1978 | CA1038283A2 Method and apparatus for testing wells |
| 09/12/1978 | CA1038282A2 Method and apparatus for testing wells |
| 08/29/1978 | US4109725 Self adjusting liquid spring operating apparatus and method for use in an oil well valve |
| 08/29/1978 | US4109724 Oil well testing valve with liquid spring |
| 08/22/1978 | US4108243 Apparatus for testing earth formations |
| 08/22/1978 | US4107981 Method of estimating ground pressure |
| 08/22/1978 | CA1036927A1 Method and apparatus for testing wells |
| 08/15/1978 | CA1036489A1 Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| 08/15/1978 | CA1036488A1 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 08/08/1978 | US4105075 Test valve having automatic bypass for formation pressure |
| 07/25/1978 | US4102396 Determining residual oil saturation following flooding |
| 07/04/1978 | US4098698 Compressed air, decompression |
| 05/23/1978 | USRE29638 Pressure controlled test valve system for offshore wells |
| 05/23/1978 | US4090398 Method for determining fluid saturations in reservoirs |
| 05/09/1978 | US4088187 Well steam sampler apparatus and method of forming and using a well steam sampler |
| 04/11/1978 | US4083409 Full flow bypass valve |
| 04/11/1978 | US4083402 Method of underground gasification of a coal bed |
| 04/11/1978 | US4083401 Apparatus and methods for testing earth formations |