| 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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| 07/30/1987 | WO1987004488A1 Method for hydraulic fracture propagation in hydrocarbon-bearing formations |
| 07/22/1987 | EP0229706A2 Hydrostatic referenced safety-circulating valve |
| 07/21/1987 | US4681854 Physical and chemical effects of subterranean fluids on a mineral substrate |
| 07/21/1987 | CA1224407A1 Sidewall core gun |
| 07/08/1987 | EP0228134A2 Axial borehole televiewer |
| 07/08/1987 | CN86202275U Pedal soil sampler |
| 07/07/1987 | US4678035 Methods and apparatus for subsurface testing of well bore fluids |
| 07/07/1987 | US4677849 Hydrocarbon well test method |
| 07/01/1987 | EP0227353A2 Annulus pressure responsive downhole tester valve |
| 07/01/1987 | EP0227192A2 Method for determining the amount of oil in a sponge core |
| 07/01/1987 | EP0227191A2 Steam profile liquid/vapour separator |
| 06/30/1987 | US4676313 For extracting a mineral from an earth formation |
| 06/30/1987 | US4676096 Downhole resettable formation sampling tool |
| 06/23/1987 | US4674328 Method and apparatus for determining subsurface conditions using a tubing packoff tool |
| 06/16/1987 | EP0225754A2 Downhole gauge carrier |
| 06/09/1987 | US4671366 Method for optimizing rock drilling |
| 06/09/1987 | US4671322 Sequential formation tester having three way normally closed valve |
| 06/03/1987 | EP0224408A2 Apparatus and method for hard rock sidewall coring in a borehole |
| 06/02/1987 | US4669554 Ground water monitoring device and method |
| 06/02/1987 | US4669537 Well test tool and system |
| 06/02/1987 | US4669536 Groundwater monitoring system |
| 06/02/1987 | CA1222444A1 Method of firing perforating gun and simultaneously recording downhole pressure |
| 05/27/1987 | EP0223553A2 Pressure operated downhole tool with releasable safety device |
| 05/27/1987 | EP0223552A2 Downhole circulation valve and method for operating the same |
| 05/27/1987 | CN86205547U Triplex pipe soil sampler with flap door |
| 05/26/1987 | US4667753 Core retainer for sidewall core tools |
| 05/26/1987 | US4667743 Low pressure responsive tester valve with ratchet |
| 05/20/1987 | EP0222620A2 Assembly for reducing the force applied to a slot and lug guide |
| 05/19/1987 | US4665991 Downhole tool with gas energized compressible liquid spring |
| 05/19/1987 | US4665984 Method of measuring crustal stress by hydraulic fracture based on analysis of crack growth in rock |
| 05/19/1987 | US4665983 Full bore sampler valve with time delay |
| 05/19/1987 | CA1222053A1 Method and device for obtaining the peak value of a signal and application to a method and a device to determine soil hardness |
| 05/19/1987 | CA1221907A1 Method for operating a production well in an oxygen driven in-situ combustion oil recovery process |
| 05/19/1987 | CA1221905A1 Fluid sampling apparatus |
| 05/19/1987 | CA1221857A1 Method for determining true fracture pressure |
| 05/19/1987 | CA1221847A1 Testing for the presence of native hydrocarbons down a borehole |
| 05/13/1987 | EP0221713A2 Downhole tool with compressible liquid spring chamber |
| 05/12/1987 | US4664196 Downhole tool with compressible liquid spring chamber |
| 05/12/1987 | US4664189 Method and device for carrying out measurements and operations in a well |
| 05/05/1987 | US4663711 Method of analyzing fluid saturation using computerized axial tomography |
| 04/28/1987 | US4661459 Measurement of steam-gas ratios in geothermal well streams |
| 04/28/1987 | US4660415 Method for determining at least one magnitude characteristic of a geological formation |
| 04/21/1987 | US4659676 Fluorescent tracers for hydrophobic fluids |
| 04/21/1987 | US4658914 Controlling sulfide scavenger content of drilling fluid |
| 04/15/1987 | EP0218328A2 Methods of analyzing vibrations from a drilling bit in a borehole |
| 04/14/1987 | US4658208 Downhole steam quality measurement |
| 04/14/1987 | US4657083 Pressure operated circulating valve with releasable safety and method for operating the same |
| 04/14/1987 | US4657082 Circulation valve and method for operating the same |
| 04/09/1987 | WO1987002095A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 04/08/1987 | EP0217684A1 Process for measuring flow and determining the parameters of multilayer hydrocarbon-producing formations |
| 04/07/1987 | US4655288 Lost-motion valve actuator |
| 04/01/1987 | EP0216706A1 Apparatus and process to measure the bubble point of petroleum from an underground formation |
| 04/01/1987 | EP0216554A2 Well tool valve with hydraulic latch |
| 03/31/1987 | US4653583 Optimum production rate for horizontal wells |
| 03/18/1987 | EP0214706A2 Borehole dilatometer intensifier |
| 03/17/1987 | US4650013 Chip sampler |
| 03/17/1987 | US4650001 Assembly for reducing the force applied to a slot and lug guide |
| 03/10/1987 | US4648471 Control system for borehole tools |
| 03/04/1987 | EP0212814A2 Method of operating APR valve in wellbore |
| 03/03/1987 | US4646843 For use in lifting a liquid from within a well |
| 03/03/1987 | US4646838 Low pressure responsive tester valve with spring retaining means |
| 03/03/1987 | US4646832 Chromatographically analyzing |
| 02/25/1987 | EP0211737A2 In situ determination of total carbon content and evaluation of source rock therefrom |
| 02/25/1987 | EP0211112A1 Apparatus and method for real-time measurement of drilling fluid properties |
| 02/25/1987 | CN86106827A Quantitative determination by elemental logging of subsurface formation properties |
| 02/17/1987 | CA1218013A1 Method of and system for conducting a borehole gravimetry survey |
| 02/10/1987 | US4641520 Shear wave transducer for stress measurements in boreholes |
| 02/10/1987 | CA1217659A Method and apparatus for soil mechanics measurements of filter cakes |
| 01/28/1987 | EP0210110A2 Full-bore sample-collecting apparatus |
| 01/27/1987 | US4638872 Core monitoring device |
| 01/24/1987 | CN86102593A Detector for measuring depth of coal bed |
| 01/13/1987 | US4635735 Method and apparatus for the continuous analysis of drilling mud |
| 01/13/1987 | US4635719 Method for hydraulic fracture propagation in hydrocarbon-bearing formations |
| 01/13/1987 | US4635717 Method and apparatus for obtaining selected samples of formation fluids |
| 01/07/1987 | EP0207785A2 Actuator for wellbore closure valve |
| 01/06/1987 | US4633952 Multi-mode testing tool and method of use |
| 12/30/1986 | US4631963 Method for measuring acoustic energy anisotropy through core samples |
| 12/24/1986 | CN85104778A Soil-fetching device for measuring soil unit weight |
| 12/23/1986 | US4631677 Method for determining the placement of perforations in a well casing |
| 12/17/1986 | EP0204760A1 Method for remote registration of down hole parameters |
| 12/16/1986 | US4629011 Method and apparatus for taking core samples from a subterranean well side wall |
| 12/16/1986 | US4628725 Apparatus and method for analyzing a fluid that includes a liquid phase, contained in a tubular conduit |
| 12/10/1986 | CN86202274U Rotatable continually soil-sampling bit |
| 12/09/1986 | US4628267 Measuring of electrical changes induced by in situ combustion through flow-through electrodes in a laboratory sample of core material |
| 12/09/1986 | US4627492 Well tool having latching mechanism and method of utilizing the same |
| 12/02/1986 | US4625795 Geomechanical probe for a drilling well |
| 11/25/1986 | US4624317 Well tool with improved valve support structure |
| 11/20/1986 | WO1986006830A1 Borehole stress-meter and method and apparatus for the installation thereof |
| 11/04/1986 | CA1213517A1 Tester valve with silicone liquid spring |
| 11/04/1986 | CA1213514A1 Annulus sample chamber, full bore, annulus pressure responsive sampler |
| 10/29/1986 | EP0199503A2 Formation tester tool |
| 10/28/1986 | CA1213353A1 Method and apparatus for soil mechanics measurements of filter cakes |
| 10/21/1986 | US4618000 Pump open safety valve and method of use |
| 10/21/1986 | US4617999 Downhole tool with compression chamber |
| 10/21/1986 | US4617994 Determining residual oil saturation by injecting CO2 and base generating reactant |
| 10/21/1986 | US4617825 Well logging analysis methods for use in complex lithology reservoirs |
| 10/21/1986 | CA1213080A1 Method and apparatus for determining characteristics of clay-bearing formations |
| 10/15/1986 | EP0197696A2 Core monitoring device |
| 10/14/1986 | US4617517 Determination of water saturation in earth formations independent of lithology |
| 10/14/1986 | CA1212604A1 Method for monitoring potassium chloride concentration in drilling fluid |