| 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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| 08/23/1990 | WO1990009508A1 Device for taking soil samples |
| 08/22/1990 | EP0383585A1 Fluid flow volumetric determination apparatus and method |
| 08/21/1990 | US4950844 Method and apparatus for obtaining a core sample at ambient pressure |
| 08/21/1990 | US4949582 Liquid sampler |
| 08/21/1990 | US4949575 For investigating properties of subsurface formations |
| 08/16/1990 | DE3904105A1 Method and device for taking soil samples |
| 08/14/1990 | CA2009939A1 Fluid flow volumetric determination apparatus and method |
| 08/09/1990 | CA2009606A1 Drilling fluid adhesion and friction coefficients measuring apparatus and cell |
| 07/26/1990 | DE3906227C1 Device for taking samples from boreholes |
| 07/25/1990 | CN1044147A Process for simulating obtaining hydrocarbon by pilot test in deposit |
| 07/24/1990 | CA1271956A1 Rapid cycle annulus pressure responsive tester valve |
| 07/17/1990 | US4941350 Method and apparatus for formation testing |
| 07/17/1990 | CA1271647A1 Borehole strain monitor for soft rock |
| 07/11/1990 | EP0377333A2 Delayed opening fluid sampler |
| 07/10/1990 | US4940088 Sonde for taking fluid samples, in particular from inside an oil well |
| 07/10/1990 | CA1271409A1 Assembly for reducing the force applied to a slot and lug guide |
| 07/04/1990 | EP0376930A1 Well tool with a removable sleeve valve |
| 07/03/1990 | CA1271132A1 Pressure operated circulating valve with releasable safety and method for operating the same |
| 07/03/1990 | CA1271131A1 Downhole tool with compressible liquid spring chamber |
| 06/27/1990 | EP0374986A1 Monitoring drilling mud composition using flowing liquid junction electrodes |
| 06/27/1990 | EP0374985A1 Monitoring drilling mud composition using ion selective electrodes |
| 06/26/1990 | US4936139 Down hole method for determination of formation properties |
| 06/26/1990 | CA1270753A1 Full bore sample valve with time delay |
| 06/26/1990 | CA1270752A1 Hydrostatic referenced safety-circulating valve |
| 06/21/1990 | CA2002451A1 Monitoring drilling mud composition using flowing liquid junction electrodes |
| 06/21/1990 | CA2002450A1 Monitoring drilling mud composition using ion selective electrodes |
| 06/20/1990 | EP0373695A1 Monitoring drilling mud |
| 06/20/1990 | CN1043185A Method of determining depth of hydraulic fracuture zone in earth |
| 06/20/1990 | CN1008462B Reversely-fitted circlip type self-controlling on and off long cyclinder engineering geological soft soil-grit sampler |
| 06/19/1990 | US4934450 Device for collecting oil samples |
| 06/15/1990 | CA2005195A1 Monitoring drilling mud |
| 06/13/1990 | CN2058208U Soil sample collection device |
| 06/12/1990 | US4932144 Remote underwater excavator and sampler |
| 06/12/1990 | CA1270189A1 Lost motion valve actuator |
| 06/12/1990 | CA1270186A1 Downhole steam sampler |
| 06/12/1990 | CA1270113A1 Method for determining formation dip |
| 06/06/1990 | CN1042769A Membrane-sample container |
| 06/05/1990 | CA1269924A1 Well tool having latching mechanism and method of utilizing the same |
| 06/05/1990 | CA1269865A1 Ground water well dimensioning procedure |
| 05/30/1990 | EP0370652A2 Downhole well tool valve |
| 05/30/1990 | EP0370606A2 Downhole well fluid sampling tool |
| 05/30/1990 | EP0370548A1 Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud |
| 05/29/1990 | US4928765 Method and apparatus for shale gas recovery |
| 05/29/1990 | US4928541 Groundwater sampling apparatus |
| 05/23/1990 | EP0369809A2 Fluid sampler |
| 05/23/1990 | DE3839003A1 Device for the removal of soil samples with a soil auger from three soil depths for soil investigations |
| 05/23/1990 | CN1042396A Method of exploration for hydrocarbons |
| 05/22/1990 | US4926942 Method for reducing sand production in submersible-pump wells |
| 05/16/1990 | EP0368437A2 Downhole tester valve and probe |
| 05/16/1990 | CN2057212U Ground recording unit for repeating stratigraphic survey |
| 05/15/1990 | US4924950 Method of drilling a well by utilizing AE/MA measurement |
| 05/15/1990 | CA1269151A1 Fluid injection control system |
| 05/08/1990 | US4922763 Method and an apparatus for taking soil samples |
| 05/08/1990 | US4922758 Cell assembly for determining conductivity and permeability |
| 05/02/1990 | CN2056696U Multi-point displacement metre for drilling hole |
| 05/01/1990 | US4921576 Method for improving sweep efficiency in CO2 oil recovery |
| 04/25/1990 | CN2056446U 原煤取样机 Coal sampling machine |
| 04/24/1990 | US4919206 Method for preventing bitumen backflow in injection wells when steam injection is interrupted |
| 04/24/1990 | US4919065 Submarine vehicle intended to measure data at the deep ocean sea-bottom |
| 04/18/1990 | EP0364362A1 Method and device for logging non-eruptive wells |
| 04/18/1990 | CN1041419A Down hole tool for determination of formation properties |
| 04/17/1990 | CA1267967A1 Hydraulic fracture analysis method |
| 04/10/1990 | US4916616 Self-consistent log interpretation method |
| 04/10/1990 | US4915171 Above packer perforate test and sample tool and method of use |
| 04/10/1990 | US4915170 Enhanced oil recovery method using crosslinked polymeric gels for profile control |
| 04/10/1990 | US4915169 Method for controlling the pH of steam fluids using heterocyclic, multifunctional, nitrogen-containing compounds |
| 04/05/1990 | WO1990003493A1 Membrane-sample container |
| 04/04/1990 | EP0362010A2 Downhole tool and method for determination of formation properties |
| 04/03/1990 | US4912971 System for recovery of petroleum from petroleum impregnated media |
| 03/28/1990 | CN2055183U Open-piston type thin wall geotome |
| 03/21/1990 | CN1040650A Test technology for thermally cyclic parallel-pipe oil extraction |
| 03/15/1990 | DE3921914A1 Controlling or regulating fluid sample extractor - using diaphragm in conjunction with collection container and intermediate valve |
| 03/14/1990 | CN2054484U Remote control bailing machine |
| 03/07/1990 | EP0357314A2 Device for controlling the position of a self-propelled drilling tool |
| 03/06/1990 | US4905774 Process and device for guiding a drilling tool through geological formations |
| 03/06/1990 | US4905510 Method of isolating an oilfield flowline sample for analysis without shearing the sample |
| 02/27/1990 | US4904603 Monitoring drilling mud |
| 02/27/1990 | US4903765 Delayed opening fluid sampler |
| 02/20/1990 | US4903207 Method for determining reservoir bulk volume of hydrocarbons from reservoir porosity and distance to oil-water contact level |
| 02/14/1990 | CN2052813U Self drill hydraulic piston thin wall earth sampler |
| 02/07/1990 | EP0353275A1 Shut-in tool. |
| 02/06/1990 | US4899320 Downhole tool for determining in-situ formation stress orientation |
| 02/06/1990 | US4898236 Drill stem testing system |
| 01/31/1990 | EP0352979A2 Variable amplitude drill |
| 01/24/1990 | EP0351902A1 Method of determining the porosity of an underground formation being drilled |
| 01/23/1990 | CA1264656A1 Full-bore sample-collecting apparatus |
| 01/18/1990 | DE3823495A1 Hydraulische gesteinzerklueftende bohrlochsonde und verfahren zu ihrer anwendung Hydraulic gesteinzerklueftende borehole probe and method for their application |
| 01/17/1990 | EP0350978A1 Method for determining drilling conditions while drilling |
| 01/16/1990 | US4893505 Subsurface formation testing apparatus |
| 01/04/1990 | DE3821823A1 Method for determining the air permeability of water-conducting soils, and a system and devices for carrying it out |
| 01/02/1990 | US4890672 Method of controlling the flow of landfill gas from sanitary landfills and apparatus for performing the method |
| 01/02/1990 | US4890487 Method for determining horizontal and/or vertical permeability of a subsurface earth formation |
| 01/02/1990 | CA1264146A1 Borehole sampling |
| 12/20/1989 | EP0347050A2 Tubing conveyed downhole sampler |
| 12/19/1989 | US4887464 Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud |
| 12/19/1989 | US4887413 Bulk sampler tool |
| 12/14/1989 | WO1989012159A1 Fluid handling apparatus |
| 12/13/1989 | EP0346099A2 Low-water-pressure controlled hydrologic test method |
| 12/13/1989 | EP0345256A1 Process for making a well. |
| 12/12/1989 | US4886129 Test procedure |