| 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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| 09/17/1986 | CN85205092U Drillability-measuring instrument for rock |
| 09/17/1986 | CN85102580A Low frequency acoustic velocity instrument used for rock, soil anol concrete |
| 09/16/1986 | CA1211296A1 Method and apparatus for placement and retrieval of downhole gauges |
| 09/09/1986 | US4610308 Bottom hole sampler and safety valve and valve therefor |
| 09/09/1986 | CA1211038A1 Low pressure responsive downhole tool with cam actuated relief valve |
| 09/09/1986 | CA1211037A1 Low pressure responsive downhole tool with cam actuated relief valve |
| 09/09/1986 | CA1211036A1 Low pressure responsive downhole tool |
| 09/09/1986 | CA1211035A1 Low pressure responsive downhole tool with floating shoe retarding means |
| 09/02/1986 | US4609821 Testing for the presence of native hydrocarbons down a borehole |
| 09/02/1986 | US4609056 Sidewall core gun |
| 09/02/1986 | US4608859 Vaporization, molecular sieves, weighing |
| 08/26/1986 | US4607524 Method for obtaining a dimensionless representation of well pressure data without the use of type-curves |
| 08/26/1986 | CA1210319A1 Geotechnical cone lubrication apparatus and method |
| 08/19/1986 | US4606227 Apparatus and method for simulating diagenesis |
| 08/13/1986 | EP0190864A2 Pressure-responsive downhole well tool |
| 08/12/1986 | CA1209699A1 Method for determining the characteristics of a fluid producing underground formation |
| 07/16/1986 | EP0187690A2 Downhole tool with liquid spring |
| 07/15/1986 | US4599904 Method for determining borehole stress from MWD parameter and caliper measurements |
| 07/09/1986 | EP0187097A2 Bottom hole sampler and safety valve |
| 07/08/1986 | US4598772 Continuous injectionof nitrogen or carbon dioxide |
| 07/08/1986 | US4598771 Method and apparatus for firing a perforating gun and simultaneously recording the downhole pressure |
| 07/02/1986 | EP0185827A1 Aerated mud centrifuge |
| 07/01/1986 | US4597439 Full-bore sample-collecting apparatus |
| 07/01/1986 | US4597290 Method for determining the characteristics of a fluid-producing underground formation |
| 06/24/1986 | US4596151 Biaxial pressure sensor |
| 06/19/1986 | WO1986003545A1 Method for remote registration of down hole parameters |
| 06/17/1986 | US4595060 Downhole tool with compressible well fluid chamber |
| 06/17/1986 | US4594887 Method and apparatus for determining characteristics of clay-bearing formations |
| 06/17/1986 | US4594885 Projectile-propelling apparatus |
| 06/10/1986 | US4593771 Tubing-conveyed external gauge carriers |
| 06/10/1986 | US4593560 Push-off pistons |
| 06/04/1986 | EP0183482A2 Downhole tool |
| 06/03/1986 | CA1205378A1 Viscosity-temperature compensator for hydraulic systems |
| 05/20/1986 | US4589485 Downhole tool utilizing well fluid compression |
| 05/07/1986 | CN85202405U Geotome for measuring the unit weight of soil body |
| 05/06/1986 | US4587641 Downhole fracture analysis |
| 05/06/1986 | US4586376 Determining the effect of fluid flow through permeable media |
| 05/06/1986 | CA1204053A1 Drill stem test and perforating system |
| 05/06/1986 | CA1204052A1 Well completion method and apparatus |
| 04/29/1986 | US4585060 Fluid sampling apparatus |
| 04/29/1986 | US4584874 Method for determining porosity, clay content and mode of distribution in gas and oil bearing shaly sand reservoirs |
| 04/29/1986 | CA1203751A1 Mechanical wireline borehole packer |
| 04/29/1986 | CA1203748A1 Guide for sidewall coring bit assembly |
| 04/22/1986 | US4583595 Method and apparatus for obtaining fluid samples in a well |
| 04/22/1986 | US4583592 Well test apparatus and methods |
| 04/22/1986 | US4583397 Method of geophysical exploration in a well borehole |
| 04/22/1986 | CA1203472A1 Full bore sampler valve apparatus |
| 04/15/1986 | US4582140 Well tool with selective bypass functions |
| 04/15/1986 | US4582136 Method and apparatus for placement and retrieval of downhole gauges |
| 04/15/1986 | US4581926 Determination of steam quality in thermal injection wells |
| 04/15/1986 | US4581922 Method of and device for obtaining the peak value of a signal and application to a method of and device for determining the hardness of a soil |
| 04/08/1986 | US4580632 Well tool for testing or treating a well |
| 04/08/1986 | CA1202879A1 Downhole tool and method using the same |
| 04/02/1986 | EP0176410A1 Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir |
| 04/01/1986 | US4579174 Well tool with hydraulic time delay |
| 03/26/1986 | EP0175553A2 Well tool with selective bypass functions |
| 03/26/1986 | EP0175536A2 Retrieval device |
| 03/25/1986 | US4577692 Pressure operated test valve |
| 03/25/1986 | US4577690 Method of using seismic data to monitor firefloods |
| 03/25/1986 | US4577689 Method for determining true fracture pressure |
| 03/19/1986 | EP0174890A1 Method for hydrocarbon well testing |
| 03/19/1986 | EP0174869A2 Jacquard fluid controller |
| 03/19/1986 | EP0174857A2 Well tool with improved valve support structure |
| 03/18/1986 | US4576234 Full bore sampler valve |
| 03/18/1986 | CA1201906A1 Bore-hole hydraulics simulator |
| 03/11/1986 | CA1201708A1 Full-bore drill stem testing apparatus with surface pressure readout |
| 03/11/1986 | CA1201652A1 Apparatus for testing earth formations |
| 03/04/1986 | US4573535 Valve for use in a well testing string located in a wellbore |
| 03/04/1986 | US4573532 Jacquard fluid controller for a fluid sampler and tester |
| 02/25/1986 | CA1201057A1 Tubing-conveyed external gauge carriers |
| 02/19/1986 | EP0171933A1 Method for estimating porosity and/or permeability |
| 02/18/1986 | US4570711 Process for optimizing the noncondensible gas content of an oil-displacing steam-foam-forming mixture |
| 02/18/1986 | US4570710 Method for preventing wellbore damage due to fines migration |
| 02/18/1986 | US4570481 Instrument locking and port bundle carrier |
| 02/11/1986 | US4569403 Formation sampling bullet |
| 01/29/1986 | CN85200204U Directreading measurment instrument for friction coefficient of drilling fluid |
| 01/28/1986 | US4566535 Dual packer apparatus and method |
| 01/28/1986 | CA1199864A1 Method and apparatus for monitoring the corrosive effects of well fluids |
| 01/21/1986 | US4565086 Method and apparatus for detecting entrained gases in fluids |
| 01/14/1986 | CA1199264A1 Process and system for detecting a native reservoir fluid in a well bore |
| 01/07/1986 | CA1198983A1 Pressure core barrel for the sidewall coring tool |
| 12/24/1985 | US4560002 Two dimensional microwave chemical flood testing means and method |
| 12/24/1985 | US4559818 Thermal well-test method |
| 12/10/1985 | US4557333 Low pressure responsive downhole tool with cam actuated relief valve |
| 12/10/1985 | US4557142 Apparatus and method for real-time measurement of drilling fluid properties |
| 12/04/1985 | EP0163426A1 Assessment of drilling conditions |
| 11/19/1985 | US4553598 Full bore sampler valve apparatus |
| 11/19/1985 | US4553428 Drill stem testing apparatus with multiple pressure sensing ports |
| 10/22/1985 | US4548080 Simulating down-hole conditions in a drilled well |
| 10/22/1985 | US4548071 Determination of oil shale yield from well log data |
| 10/22/1985 | CA1195532A1 Soil sampler |
| 10/16/1985 | EP0158465A2 Multi-mode testing tool |
| 10/15/1985 | US4547078 For recovering oil by introducing steam |
| 10/15/1985 | US4546640 Positive air gas detector |
| 10/15/1985 | CA1195238A1 Low pressure responsive apr tester valve |
| 10/15/1985 | CA1195237A1 Low pressure responsive apr tester valve |
| 10/15/1985 | CA1195236A1 Circulation valve |
| 10/08/1985 | US4546252 Method for monitoring potassium chloride concentration in drilling fluids |
| 10/08/1985 | US4545702 Boring-injection device, method for improving ground by means of the device and method for investigating ground state by means of the device |
| 10/08/1985 | CA1194781A1 Pump-down stinger assembly method and apparatus |