| 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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| 02/23/1982 | US4316393 Soil sampler and mounting arrangement |
| 02/23/1982 | US4316386 Fluid pressure measuring apparatus for incorporation into a pipeline rising from a well |
| 02/16/1982 | US4315656 Method for reducing porosity of rubblized oil shale |
| 02/10/1982 | EP0045607A2 Method and apparatus of fracturation detection |
| 02/02/1982 | US4313785 Method and apparatus for treating waste rock cuttings |
| 02/02/1982 | CA1117411A1 Oil recovery prediction technique |
| 01/26/1982 | US4312414 Method and apparatus for obtaining saturation data from subterranean formations |
| 01/26/1982 | CA1117001A1 Well testing method |
| 01/19/1982 | US4311197 Annulus pressure operated closure valve with improved reverse circulation valve |
| 01/12/1982 | US4310887 Verification and calibration of well logs and reconstruction of logs |
| 01/12/1982 | US4310057 Apparatus for extracting subterranean gas samples |
| 12/22/1981 | USRE30827 Process and device for the determination of the characteristics of the geological formations traversed by a borehole |
| 12/22/1981 | US4306879 Chemical logging of geothermal wells |
| 12/22/1981 | CA1114741A1 Isolating packer units in geological and geophysical measuring casings |
| 12/01/1981 | CA1113418A1 Apparatus and method for removing hydrocarbons from drill cuttings |
| 11/24/1981 | US4301679 Well flow sampling system |
| 11/17/1981 | US4300397 Device and method for determining material strength in situ |
| 11/17/1981 | CA1112559A1 Casing assembly probes |
| 11/17/1981 | CA1112558A1 Measuring casing coupler apparatus |
| 11/17/1981 | CA1112557A1 Sampler and measurement apparatus |
| 11/10/1981 | US4299709 Stabilized by an aromatic hydrocarbon |
| 11/10/1981 | US4299123 Sonic gas detector for rotary drilling system |
| 11/03/1981 | US4298572 Automatic, continuous analysis of hydrogen associated with drilling mud circulating through bore hole |
| 10/27/1981 | CA1111542A1 Method for determining the degree of change of material properties of underground strata |
| 10/20/1981 | US4295801 Fluid-powered submersible sampling pump |
| 10/20/1981 | US4295365 NMR Analysis of subterranean reservoir samples immersed in liquid halocarbons |
| 10/20/1981 | US4295361 Drill pipe tester with automatic fill-up |
| 10/13/1981 | CA1110697A1 Apparatus and method for determining subsurface formation properties |
| 10/06/1981 | US4292842 Tool for testing earth formations in boreholes |
| 09/29/1981 | US4291581 Monitoring earth/rock movements |
| 09/15/1981 | US4289201 Well test apparatus |
| 09/08/1981 | US4287946 Formation testers |
| 09/08/1981 | US4287761 Mud sampling chamber |
| 09/01/1981 | US4286661 Equalizing valve for use in a well tool string |
| 08/25/1981 | US4285398 Device for temporarily closing duct-formers in well completion apparatus |
| 08/11/1981 | US4282750 Process for measuring the formation water pressure within an oil layer in a dipping reservoir |
| 08/04/1981 | US4282587 Method for monitoring the recovery of minerals from shallow geological formations |
| 08/04/1981 | US4281715 Bypass valve |
| 08/04/1981 | US4281713 Method and apparatus for monitoring the position and movement progress of the flame front in an underground combustion |
| 08/04/1981 | US4281712 Minimizing clay and shale damage in a log-inject-log procedure |
| 07/28/1981 | US4280569 Fluid flow restrictor valve for a drill hole coring tool |
| 07/28/1981 | US4280568 Sidewall sampling apparatus |
| 07/21/1981 | US4279305 Process for stimulating a well with a saline surfactant sulfate, alkanol and acid system |
| 07/21/1981 | US4279302 Analyzing kerogen |
| 07/14/1981 | US4278130 Access valve for drill stem testing |
| 07/14/1981 | US4278128 Petroleum recovery chemical retention prediction technique |
| 07/07/1981 | US4276778 Anaerobic sampling method |
| 07/07/1981 | CA1104489A1 In situ oil shale retorting |
| 07/01/1981 | EP0030975A1 Hydraulic motor for a drill hole coring tool and method |
| 06/30/1981 | US4275787 Method for monitoring subsurface combustion and gasification processes in coal seams |
| 06/30/1981 | CA1103952A1 Pneumatic equalizer for fluid sampling cell |
| 06/23/1981 | US4274486 Apparatus for and method of operating a well |
| 06/23/1981 | US4274485 Method and system for well testing |
| 06/23/1981 | US4274283 Apparatus and method for measuring fluid gel strength |
| 06/16/1981 | US4273187 Injection-soak-production cycle |
| 06/16/1981 | US4272994 Constant pressure apparatus and method |
| 06/09/1981 | US4271904 Method for controlling underground combustion |
| 06/09/1981 | US4271696 Method of determining change in subsurface structure due to application of fluid pressure to the earth |
| 06/09/1981 | CA1102875A1 Method and apparatus for the exploration of boreholes |
| 06/02/1981 | US4270610 Annulus pressure operated closure valve with improved power mandrel |
| 06/02/1981 | US4270385 Tool for testing earth formations in boreholes |
| 05/27/1981 | EP0029353A2 Apparatus for and method of testing and completing wells |
| 05/19/1981 | US4267726 Well pressure testing method |
| 05/15/1981 | EP0030975A4 Hydraulic motor for a drill hole coring tool and method. |
| 05/12/1981 | US4266608 Method for detecting underground conditions |
| 05/05/1981 | US4265309 Evaluation and production of attic oil |
| 05/05/1981 | US4265308 Oil recovery method using unique salinity for oil recovery surfactant system |
| 04/28/1981 | US4263970 Introducing an oxidizing gas |
| 04/28/1981 | US4263969 Flame front control in underground combustion |
| 04/21/1981 | US4263509 Gamma ray logging |
| 04/01/1981 | EP0026105A2 A valve for use in well testing and a method of utilising said valve |
| 03/31/1981 | US4258793 Oil well testing string bypass valve |
| 03/31/1981 | US4258788 CPI Casing |
| 03/24/1981 | US4257266 Sample extractor |
| 03/24/1981 | CA1098109A1 Method of and apparatus for recovery of cores from soft and unconsolidated earth materials |
| 03/10/1981 | US4254832 Sampler and measurement apparatus |
| 03/10/1981 | US4254830 Geothermal well sampler apparatus |
| 02/25/1981 | EP0024214A2 A by-pass valve for a well testing apparatus |
| 02/24/1981 | US4252374 Determining the locus of a processing zone in an oil shale retort by shale oil composition |
| 02/24/1981 | US4252200 Sampling device |
| 02/24/1981 | US4252195 Well test systems and methods |
| 02/17/1981 | US4251773 Method and apparatus for exploration of geological formation tilt in boreholes |
| 02/10/1981 | US4250142 Volatile hydrocarbon detector apparatus |
| 02/10/1981 | US4249603 Doping a retort with radioactive nuclides to determine the locus of a processing zone |
| 02/04/1981 | EP0023399A2 Method and apparatus for testing petroleum wells |
| 02/03/1981 | US4248300 Method of and apparatus for positioning retrievable landing nipple in a well bore string |
| 02/03/1981 | US4248081 Tool for testing earth formations in boreholes |
| 02/03/1981 | CA1094948A1 Self-adjusting liquid spring operating apparatus and method for use in an oil well valve |
| 02/03/1981 | CA1094943A1 Reclosable circulating valve for use in oil well testing |
| 01/27/1981 | US4246964 Down hole pump and testing apparatus |
| 01/27/1981 | US4246782 Tool for testing earth formations in boreholes |
| 01/08/1981 | WO1981000018A1 Hydraulic motor for a drill hole coring tool and method |
| 01/08/1981 | WO1981000017A1 Apparatus and method for drilling into the sidewall of a drill hole |
| 01/08/1981 | WO1981000016A1 Fluid flow restrictor valve for a drill hole coring tool and method |
| 01/06/1981 | US4242915 Extensometer anchor |
| 12/30/1980 | CA1092389A1 Soil sample core extraction tool |
| 12/16/1980 | CA1091471A1 Method and apparatus for logging earth boreholes using self-contained logging instrument |
| 12/11/1980 | WO1980002718A1 Method of drilling productive stratum |
| 11/18/1980 | US4233840 Method for evaluation of the response of different cores to a recovery process and apparatus therefor |
| 11/18/1980 | US4233839 Apparatus and method for determining characteristics of subsurface formations |