| 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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| 04/16/1998 | WO1998015850A1 Method of obtaining improved geophysical information about earth formations |
| 04/14/1998 | US5739435 Two-stage strain-sensing device and method |
| 03/24/1998 | US5730219 Production wells having permanent downhole formation evaluation sensors |
| 03/18/1998 | EP0829699A2 Method and system for measuring three-dimensional displacement |
| 03/12/1998 | WO1998010168A1 Sampling device |
| 03/10/1998 | US5725055 For use in a borehole in the earth |
| 02/25/1998 | EP0825328A2 Apparatus for formation testing |
| 02/12/1998 | DE19717988C1 Method for determining stress, deformation, etc of loose stones or dumped waste at different depths |
| 02/11/1998 | CN2274253Y 孔定位器 Hole Locator |
| 02/10/1998 | US5716164 Process for the local treatment of soil in particular for examination and cleaning of contaminated soil |
| 02/05/1998 | WO1998004804A1 Apparatus and method for milling a hole in casing |
| 02/04/1998 | CN2273770Y Bearing type slide-ring used for well survery hoist |
| 02/04/1998 | CN1172257A Method for fluoroscent logging of detritus |
| 01/29/1998 | WO1998003768A1 Soil sampling tool with unique vent-and-seal feature |
| 01/28/1998 | EP0710319B1 Method and device for detecting and/or measuring at least one geophysical parameter on a core sample |
| 01/27/1998 | US5711373 Method for recovering a hydrocarbon liquid from a subterranean formation |
| 01/22/1998 | WO1998002638A1 Apparatus and method for performing imaging and downhole operations at work site in wellbores |
| 01/21/1998 | EP0819819A1 Milling head,drilling device and method for underwater drilling |
| 01/20/1998 | US5710726 Semi-compositional simulation of hydrocarbon reservoirs |
| 01/14/1998 | CN1170135A Method for determining oil content of underground formation using wet cuttings |
| 01/13/1998 | US5708220 Liquid sampling device and method |
| 01/13/1998 | US5708204 Fluid flow rate analysis method for wireline formation testing tools |
| 01/13/1998 | US5706904 Soil sampling tool with volume-indicating feature |
| 01/13/1998 | US5706892 Downhole tools for production well control |
| 01/07/1998 | EP0815351A1 Method and apparatus for fluid and soil sampling |
| 01/07/1998 | EP0815344A1 Whipstock |
| 01/07/1998 | EP0620893A4 Formation testing and sampling method and apparatus. |
| 01/06/1998 | US5705812 Compaction monitoring instrument system |
| 01/06/1998 | US5704425 For use in a multilevel borehole monitoring system |
| 12/31/1997 | WO1997049894A1 Method and apparatus for testing, completing and/or maintaining wellbores using a sensor device |
| 12/30/1997 | US5703286 Method of formation testing |
| 12/29/1997 | EP0618994A4 Sidewall rotary coring tool. |
| 12/18/1997 | DE19623439A1 Water sampling tube for borehole to extract samples from differing levels |
| 12/10/1997 | EP0811748A1 Automatic downhole pump assembly and method for use of the same |
| 12/10/1997 | EP0811747A2 Downhole tool and method for use of the same |
| 12/10/1997 | EP0646215A4 Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations. |
| 12/05/1997 | CA2178175A1 Thermal pulse flowmeter sensor |
| 12/02/1997 | US5692565 Apparatus and method for sampling an earth formation through a cased borehole |
| 11/27/1997 | WO1997044958A1 Bored wall surface observation apparatus |
| 11/27/1997 | CA2255820A1 Bored wall surface observation apparatus |
| 11/18/1997 | US5687806 Method and apparatus for drilling with a flexible shaft while using hydraulic assistance |
| 11/18/1997 | US5687791 Method of well-testing by obtaining a non-flashing fluid sample |
| 11/11/1997 | US5686724 Method for determining oil content of an underground formation using wet cuttings |
| 11/11/1997 | US5686299 Method and apparatus for determining nutrient stimulation of biological processes |
| 11/06/1997 | WO1997032110A3 Downhole core sampling and testing apparatus |
| 11/06/1997 | DE19616703A1 Aperture forming method for underground reed used in soil sampling |
| 10/30/1997 | DE19616784A1 Ground water test device |
| 10/22/1997 | CN1162689A Apparatus and method for sampling earth formation through cased borehole |
| 10/22/1997 | CN1162686A Method and apparatus for drilling with flexible shaft while using hydraulic assistance |
| 10/16/1997 | WO1997038208A1 Method for evaluating a hydraulic fracture treatment in a wellbore |
| 10/14/1997 | US5677631 Coaxial two port waveguide flowline sensor |
| 10/09/1997 | WO1997037103A1 Method and system for monitoring a characteristic of an earth formation in a well |
| 10/08/1997 | EP0599876B1 Multi-sensor relief valve well test system |
| 10/07/1997 | US5675088 Method and apparatus for automatic monitoring of tectonic stresses and quantitative forecast of shallow earthquakes |
| 10/07/1997 | US5673762 Expendable protective sleeve and method of use for soil and groundwater sampling |
| 10/02/1997 | WO1997036091A1 Method of assaying compressive strength of rock |
| 10/02/1997 | WO1997036084A1 Method of assaying downhole occurrences and conditions |
| 09/30/1997 | US5672819 Formation evaluation using phase shift periodic pressure pulse testing |
| 09/30/1997 | CA2128024C Method and apparatus for acquiring and processing subsurface samples of connate fluid |
| 09/25/1997 | WO1997035093A1 Method and apparatus using coiled-in-coiled tubing |
| 09/25/1997 | DE19606630C1 Soil sample extraction device |
| 09/23/1997 | US5670711 Portable rock strength evaluation device |
| 09/23/1997 | US5669454 To be driven into the ground to form a borehole |
| 09/16/1997 | US5667025 Of an earth formation from a borehole |
| 09/10/1997 | EP0794433A1 API estimate using multiple fluorescence measurements |
| 09/10/1997 | EP0794432A1 Method for determining oil content of an underground formation using cuttings |
| 09/07/1997 | CA2171155A1 Underground fluid sampling apparatus |
| 09/05/1997 | CA2199115A1 Api estimate using multiple fluorescence measurements |
| 09/05/1997 | CA2199091A1 Method for determining oil content of an underground formation using wetcuttings |
| 09/04/1997 | WO1997032110A2 Downhole core sampling and testing apparatus |
| 09/02/1997 | US5663559 Microscopy imaging of earth formations |
| 09/02/1997 | US5662166 Apparatus for maintaining at least bottom hole pressure of a fluid sample upon retrieval from an earth bore |
| 09/02/1997 | US5662165 Production wells having permanent downhole formation evaluation sensors |
| 09/02/1997 | CA2134366C Method and apparatus for acquiring and identifying sidewall core samples |
| 08/28/1997 | WO1997031175A1 Moling apparatus and a ground sensing system therefor |
| 08/28/1997 | CA2251688A1 Moling apparatus and a ground sensing system therefor |
| 08/27/1997 | EP0791723A1 Apparatus and method for sampling an earth formation through a cased borehole |
| 08/27/1997 | EP0791722A1 Apparatus and method for drilling with a flexible shaft from within a borehole |
| 08/27/1997 | EP0791721A1 Apparatus and method for drilling with a flexible shaft |
| 08/13/1997 | EP0757746A4 Method for measuring formation fluids in drilling fluid |
| 08/13/1997 | EP0644979A4 Method and apparatus for inspecting subsurface environments. |
| 08/13/1997 | CN2259486Y Portable sounding device |
| 07/30/1997 | CN1155614A Method for discription of single or plural well logging information using uniformed formation |
| 07/18/1997 | CA2194527A1 Method and apparatus for analyzing physical properties of materials |
| 07/15/1997 | US5648603 Method and apparatus for stabilizing a quantitative measurement gas trap used in a drilling operation |
| 07/08/1997 | US5646337 Method and device for measuring parameters of plastic ground |
| 07/02/1997 | EP0781894A2 Method and apparatus for well servicing |
| 07/02/1997 | EP0781893A2 Apparatus and method for early evaluation and servicing of a well |
| 07/01/1997 | US5644076 For determining characteristics of a subterranean earth formation |
| 06/27/1997 | CA2193270A1 Method of well testing by obtaining a non-flashing fluid sample |
| 06/26/1997 | WO1997022781A1 Improved measurement port coupler and probe interface |
| 06/24/1997 | US5641020 Treatment of contaminated water in clays and the like |
| 06/24/1997 | CA2108914C Formation testing apparatus and method |
| 06/17/1997 | US5638904 Within wells |
| 06/12/1997 | DE19542091C1 Bore sample extraction device |
| 06/11/1997 | EP0777813A1 Formation isolation and testing apparatus and method |
| 06/03/1997 | US5635712 Method for monitoring the hydraulic fracturing of a subterranean formation |
| 06/03/1997 | US5635653 Ground water sampling device |
| 06/03/1997 | US5635636 Method of determining inflow rates from underbalanced wells |
| 06/03/1997 | US5635631 Determining fluid properties from pressure, volume and temperature measurements made by electric wireline formation testing tools |