| 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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| 03/07/1978 | USRE29562 Method and apparatus for testing wells |
| 02/28/1978 | US4076085 Drill sampling diversion unit |
| 02/28/1978 | US4076077 Weight and pressure operated well testing apparatus and its method of operation |
| 02/28/1978 | US4075885 Rock borehole shear tester |
| 01/24/1978 | US4069865 Bottom hole fluid pressure communicating probe and locking mandrel |
| 01/03/1978 | US4066139 Sampling drill |
| 01/03/1978 | US4066138 Earth boring apparatus employing high powered laser |
| 12/27/1977 | US4064937 Annulus pressure operated closure valve with reverse circulation valve |
| 12/27/1977 | US4064749 Method and system for determining formation porosity |
| 12/20/1977 | US4063593 Full-opening annulus pressure operated sampler valve with reverse circulation valve |
| 11/22/1977 | US4059153 Weight and pressure operated well testing apparatus and its method of operation |
| 11/15/1977 | US4058165 Wellbore circulating valve |
| 10/11/1977 | US4052893 Measuring reservoir oil saturation |
| 10/11/1977 | US4052885 Portable device and method for determining permeability characteristics of earth formations |
| 10/04/1977 | US4051897 Well testing tool |
| 09/27/1977 | US4050512 Stroke actuated well testing tool |
| 09/27/1977 | US4050315 Remotely actuated sampling apparatus |
| 09/13/1977 | US4047564 Weight and pressure operated well testing apparatus and its method of operation |
| 09/13/1977 | US4047430 Method and apparatus for logging earth boreholes using self-contained logging instrument |
| 08/30/1977 | US4044829 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 08/23/1977 | US4043407 Drilling sampling/testing equipment |
| 08/23/1977 | US4043192 Apparatus for providing directional permeability measurements in subterranean earth formations |
| 06/28/1977 | US4031973 Placer mining tool |
| 06/28/1977 | US4031957 Method and apparatus for testing and treating well formations |
| 06/21/1977 | US4030345 Borehole pressure cell |
| 05/31/1977 | US4026355 Method for testing and monitoring for producing landfill gas |
| 05/10/1977 | US4022349 Mud heater and pump therefor |
| 05/10/1977 | US4022276 Method of selecting oil recovery fluids using nuclear magnetic resonance measurements |
| 04/26/1977 | US4019380 Underwater sampler |
| 03/29/1977 | US4015194 Oil well logging device having plural well fluid parameter measuring devices and a single conductor for accommodating both measurement and power signals |
| 03/01/1977 | US4009609 Method and apparatus for testing a subsurface formation for fluid retention potential |
| 02/08/1977 | US4007366 Radioactive tracer profiling system and apparatus |
| 02/08/1977 | US4006777 Free floating carrier for deep well instruments |
| 02/08/1977 | US4006630 Well testing apparatus |
| 01/18/1977 | US4003441 Method of opening carbon-bearing beds with production wells for underground gasification |
| 01/11/1977 | US4002063 Well logging pad devices having differential pressure relief |
| 12/14/1976 | US3996678 Free-fall grab |
| 11/23/1976 | US3993131 Tracing flow of petroleum in underground reservoirs |
| 11/23/1976 | US3992927 Soil movement detection apparatus |
| 11/16/1976 | US3992095 Optics module for borehole stress measuring instrument |
| 11/16/1976 | US3991838 Drill sampling diversion unit |
| 11/09/1976 | US3990298 Method of determining the relation between fractional flow and saturation of oil |
| 11/09/1976 | US3990297 Process and device for the determination of the characteristics of the geological formations traversed by a borehole |
| 10/26/1976 | US3987850 Well completion method for controlling sand production |
| 10/19/1976 | US3986554 Pressure controlled reversing valve |
| 10/19/1976 | US3986553 Fluid sampling vessel |
| 09/28/1976 | US3982432 Well monitoring and analyzing system |
| 09/21/1976 | US3981189 Methods and steam samplers with inertial latch |
| 09/21/1976 | US3981188 Method and apparatus for testing wells |
| 09/14/1976 | USRE28963 Determination of residual oil in a formation |
| 08/31/1976 | US3977479 Geological exploration method and apparatus |
| 08/24/1976 | US3976136 Pressure operated isolation valve for use in a well testing apparatus and its method of operation |
| 07/20/1976 | US3970147 Method and apparatus for annulus pressure responsive circulation and tester valve manipulation |
| 07/20/1976 | US3969937 Method and apparatus for testing wells |
| 07/20/1976 | US3969929 Drill module for borehole stress measuring instrument |
| 07/13/1976 | US3968845 Apparatus and method for geological drilling and coring |
| 07/13/1976 | US3968844 Determining the extent of entry of fluids into a borehole during drilling |
| 06/22/1976 | US3964544 Pressure operated isolation valve for use in a well testing and treating apparatus, and its method of operation |
| 06/22/1976 | US3964305 Apparatus for testing oil wells |
| 06/15/1976 | US3962915 Method of positioning apparatuses for measuring soil conditions |
| 06/08/1976 | US3961524 Method and apparatus for determining rock stress in situ |
| 06/01/1976 | US3960448 Holographic instrument for measuring stress in a borehole wall |
| 05/25/1976 | US3959648 Dual spectra well logging system and method |
| 05/18/1976 | US3957117 Method and apparatus for bottom hole testing in wells |
| 04/27/1976 | US3952588 Apparatus for testing earth formations |
| 04/13/1976 | US3949497 Releasable latching apparatus for a benthic grab |
| 03/30/1976 | US3946604 Methods and apparatus for determining characteristics of subsurface earth formations |
| 03/23/1976 | US3945247 Percolation gauge |
| 03/09/1976 | US3942374 Apparatus for the determination of the quantity of oil |
| 02/24/1976 | US3940610 Natural gamma radiation borehole logging system |
| 02/10/1976 | US3937060 Mud gas content sampling device |
| 01/27/1976 | US3934469 Method and steam samplers |
| 01/27/1976 | US3934468 Formation-testing apparatus |
| 01/06/1976 | US3930754 Portable water sampling apparatus |
| 01/06/1976 | US3930540 Wellbore circulating valve |