| 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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| 08/05/1994 | CA2114926A1 Downhole fluid property measurement tool |
| 07/27/1994 | EP0506737B1 Sampling tool for obtaining samples of fluids present in a well |
| 07/26/1994 | US5332035 Shut-in tools |
| 07/19/1994 | US5331155 Methods of determining subterranean formation characteristics using computed tomographic images |
| 07/19/1994 | US5329811 Downhole fluid property measurement tool |
| 07/12/1994 | US5327981 Ground water sampling device |
| 07/12/1994 | CA2009349C Method and device for in-situ determination of rheological properties of earth materials |
| 07/07/1994 | WO1994015229A1 Method and apparatus for downhole measurement of fluid conductivity and hydrocarbon volume during formation testing |
| 07/07/1994 | CA2117478A1 Method and apparatus for downhole measurement of fluid conductivity and hydrocarbon volume during formation testing |
| 07/06/1994 | EP0604428A1 Device for measuring reflectance and fluorescence of in-situ soil |
| 07/06/1994 | EP0470160B1 Well control apparatus |
| 07/05/1994 | US5325918 Optimal joule heating of the subsurface |
| 07/05/1994 | US5325709 Measurement, calibration and probe storage apparatus for measuring pH of fluids and slurries |
| 06/29/1994 | CN1088683A High-precision high moisture content aqueous ratio meter |
| 06/28/1994 | US5323800 Washer for a portable self-contained ground water testing assembly |
| 06/28/1994 | US5323648 Formation evaluation tool |
| 06/28/1994 | CA2002468C Method of determining the depth of a hydraulic fracture zone in the earth |
| 06/28/1994 | CA1330432C Drill stem test method and apparatus |
| 06/21/1994 | US5322388 Toxic waste monitoring and collection device |
| 06/21/1994 | US5322135 Open hole coring method |
| 06/21/1994 | US5322126 System and method for monitoring fracture growth during hydraulic fracture treatment |
| 06/21/1994 | US5322120 Electro hydraulic deep well sampling assembly |
| 06/14/1994 | US5319966 Determining location and composition of liquid contaminants in geologic formations |
| 06/14/1994 | US5319959 Air lubricated penetrometer rod system |
| 06/08/1994 | EP0599876A1 Multi-sensor relief valve well test system. |
| 06/07/1994 | CA2006482C Method for improving enhanced recovery of oil using surfactant-stabilized foams |
| 06/07/1994 | CA1329999C Method of underground fluid sampling |
| 05/26/1994 | WO1994011611A1 Formation testing and sampling method and apparatus |
| 05/18/1994 | CN1024581C Open-end pistong type thin shell soil sampler |
| 05/11/1994 | WO1994010423A1 Modular, multi-level groundwater sampler |
| 05/11/1994 | WO1994010421A1 Sidewall rotary coring tool |
| 05/11/1994 | EP0596165A1 Well based sensor for detecting the presence of liquid hydrocarbons on groundwater |
| 05/11/1994 | CN2164461Y Apparatus for taking sample from well |
| 05/11/1994 | CA2126856A1 Sidewall rotary coring tool |
| 05/10/1994 | US5310013 Core marking system for a sidewall coring tool |
| 05/10/1994 | US5309761 Methods and apparatus for measuring the erodability of drilling fluid deposits |
| 05/05/1994 | DE4236692A1 Method of hydraulic tomography to identify spaced permeability in subsoil - involves forming non=stationary flow fields whose permeability is numerically reconstructed by pore water pressure and volume flow measurements |
| 05/04/1994 | CN2163870Y Man-power rotary milling soil-taking apparatus |
| 05/03/1994 | US5307884 Multi-level sampling device |
| 04/27/1994 | EP0594393A1 Downhole formation testing apparatus |
| 04/26/1994 | US5306909 Analysis of drilling fluids |
| 04/26/1994 | US5305836 System and method for controlling drill bit usage and well plan |
| 04/19/1994 | US5305211 Method for determining fluid-loss coefficient and spurt-loss |
| 04/19/1994 | US5305209 Method for characterizing subterranean reservoirs |
| 04/19/1994 | US5303775 Method and apparatus for acquiring and processing subsurface samples of connate fluid |
| 04/19/1994 | US5303582 Pressure-transient testing while drilling |
| 04/14/1994 | WO1994008127A1 Method for calculating sedimentary rock pore pressure |
| 04/12/1994 | US5301759 Method and apparatus for core-sampling subsurface rock formations |
| 04/12/1994 | US5301561 Method and apparatus for taking a fluid sample |
| 04/06/1994 | EP0590987A2 Determining orientation of a wellbore relative to formation stress fields |
| 03/30/1994 | EP0589591A1 Downhole fracture test and analysis |
| 03/29/1994 | US5297629 Drill stem testing with tubing conveyed perforation |
| 03/22/1994 | US5295393 Fracturing method and apparatus |
| 03/15/1994 | US5293934 Ground water sampling unit having a fluid-operated seal |
| 03/15/1994 | US5293931 Modular, multi-level groundwater sampler |
| 03/09/1994 | EP0586223A2 Method of testing a production well and of perforating a new zone |
| 03/08/1994 | US5291796 Apparatus and method for draining high pressure fluid samples without mercury |
| 03/02/1994 | EP0584475A1 Drilling device provided with an acceleration nozzle |
| 03/01/1994 | US5289875 Apparatus for obtaining subterranean fluid samples |
| 02/23/1994 | EP0583977A2 Cementing systems for oil wells |
| 02/23/1994 | CN2157307Y Percussion sampler |
| 02/23/1994 | CN2157306Y Expanding and cleaning drill tool |
| 02/22/1994 | US5287741 Methods of perforating and testing wells using coiled tubing |
| 02/15/1994 | US5285692 Methods for measuring physical parameters of a low permeability rock formation in situ |
| 02/15/1994 | US5285683 Method and apparatus for determining orientation of a wellbore relative to formation stress fields |
| 02/09/1994 | EP0581976A1 Soil Gas Sampling Probe |
| 02/08/1994 | US5284051 Saturating porous residual rock with first fluid containing dyed styrene monomer, injecting second fluid containing second monomer of different color, monitoring flow with ultraviolet light |
| 02/08/1994 | CA2011911C Single-well internally calibrated method for determining residual oil saturation |
| 02/01/1994 | US5282384 Method for calculating sedimentary rock pore pressure |
| 02/01/1994 | CA2100137A1 Drilling apparatus |
| 01/30/1994 | CA2074845A1 Method for detecting petroleum and mineral deposits within the arctic shelf |
| 01/26/1994 | EP0403603B1 Membrane-sample container |
| 01/26/1994 | CN2154348Y Consistency determining instrument for drilling liquid polymer |
| 01/19/1994 | CN2153633Y Geological sampler |
| 01/18/1994 | US5279363 Actuator apparatus for a downhole tool |
| 01/18/1994 | US5279153 Apparatus for determining horizontal and/or vertical permeability of an earth formation |
| 01/11/1994 | US5277263 Method for measuring formation fluids in drilling fluid |
| 01/11/1994 | US5277252 Sampling tool for obtaining samples of fluids present in a well |
| 01/06/1994 | WO1994000671A1 Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations |
| 01/06/1994 | WO1994000669A1 Method and apparatus for inspecting subsurface environments |
| 01/06/1994 | CA2138013A1 Method and apparatus for inspecting subsurface environments |
| 01/04/1994 | US5275198 Portable self-contained ground water testing assembly |
| 01/04/1994 | US5275041 Equilibrium fracture test and analysis |
| 01/04/1994 | US5275040 Method of and apparatus for detecting an influx into a well while drilling |
| 12/27/1993 | CA2072467A1 Vapor probe for soil gas vapor sampler |
| 12/22/1993 | CN2150333Y Combined sampler with screw in tube |
| 12/21/1993 | US5271469 Borehole stressed packer inflation system |
| 12/21/1993 | CA1325379C Down hole reservoir fluid sampler |
| 12/14/1993 | US5269180 Borehole tool, procedures, and interpretation for making permeability measurements of subsurface formations |
| 12/14/1993 | CA1325278C Method of analysing fluid influxes in hydrocarbon wells |
| 12/09/1993 | DE4318788A1 Sample lifter extracting liquid specimens from deep regions - has open tube with end closure device and trigger mechanism attached to cable |
| 12/02/1993 | DE4217263A1 Drawing off of ground pore gas samples using probe inserted in ground - sucking gas and transferring to sample vessel only when stable equilibrium exists between components of gas |
| 12/01/1993 | EP0475986B1 Method and device for in-situ measurement of ground heave characteristics |
| 11/30/1993 | US5265466 Rod insertion method and friction reducing device |
| 11/25/1993 | WO1993023741A1 Device for measuring reflectance and fluorescence of in-situ soil |
| 11/23/1993 | US5265015 Determining horizontal and/or vertical permeability of an earth formation |
| 11/18/1993 | EP0569685A2 Portable self-contained ground water testing assembly |
| 11/17/1993 | CN1078534A Emergent withdrawing device for push close-set unit of formation tester |
| 11/16/1993 | US5261348 Flow-through cell with diverter circuit |
| 11/16/1993 | CA2091519A1 Portable self-contained ground water testing assembly |