| 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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| 12/20/1991 | CA2044944A1 Dielectric measuring apparatus for determining oil and water mixtures in a well borehole |
| 12/18/1991 | EP0461963A1 Method and device for logging non-eruptive wells |
| 12/18/1991 | EP0461321A1 Apparatus and method for analyzing the composition of formation fluids |
| 12/11/1991 | CN1015071B Membrane-sample container |
| 12/10/1991 | US5070949 Method of analyzing fluid influxes in hydrocarbon wells |
| 12/10/1991 | US5070725 Water-cut monitoring means and method |
| 12/03/1991 | US5070457 Methods for design and analysis of subterranean fractures using net pressures |
| 11/27/1991 | EP0458391A1 Pipe rheometer |
| 11/27/1991 | EP0457791A1 Device for taking soil samples. |
| 11/27/1991 | CN2089525U Vacuum sampler |
| 11/27/1991 | CN2089524U Underwell jet pump sampler |
| 11/24/1991 | CA2042993A1 Pipe rheometer |
| 11/19/1991 | US5065619 Method for testing a cased hole formation |
| 11/13/1991 | EP0456581A1 Bottle for fluid sampling, for use in deep boreholes |
| 11/13/1991 | EP0456424A2 Method of determining fracture characteristics of subsurface formations |
| 11/13/1991 | EP0456339A2 Determining fracture parameters for heterogeneous formations |
| 11/12/1991 | WO1991018183A1 Underground fluid sampling system |
| 11/12/1991 | US5064348 Determination of well pumping system downtime |
| 11/12/1991 | CA2082642A1 Underground fluid sampling system |
| 11/05/1991 | US5063519 Landfill gas production testing and extraction method |
| 11/05/1991 | US5062482 Piezometer actuator device and method for its installation in a borehole |
| 10/30/1991 | CN1014537B Drill stem test method and apparatus |
| 10/24/1991 | DE4012625A1 Water sample extractor for bore - has operating unit providing bidirectional optical data transfer for programming and sensor information |
| 10/22/1991 | US5058674 Wellbore fluid sampler and method |
| 10/16/1991 | EP0289520B1 Remote underwater excavator and sampler |
| 10/15/1991 | US5058012 Method of extrapolating reservoir performance |
| 10/15/1991 | US5056595 Wireline formation test tool with jet perforator for positively establishing fluidic communication with subsurface formation to be tested |
| 10/15/1991 | CA1290669C Method for determining residual oil saturation |
| 10/15/1991 | CA1290668C Process for determining residual oil saturation |
| 10/09/1991 | EP0450749A2 Apparatus for side-wall coring in boreholes |
| 10/08/1991 | US5054557 Device for extracting a liquid out of a tube of great length |
| 10/08/1991 | US5054553 Method of underground-water exploration during well-construction by hydraulic-system drilling |
| 10/02/1991 | DE4109079A1 Dust removal plant for rock drilling - has facility for taking dust samples, and involves fan feeding drill waste in air current |
| 10/02/1991 | CN1055034A Open-end piston type thin shell soil sampler |
| 10/01/1991 | US5052219 Procedure and cell for measuring coefficients of adhesion and friction of a drilling fluid |
| 09/24/1991 | US5050690 In-situ stress measurement method and device |
| 09/24/1991 | US5050674 Method for determining fracture closure pressure and fracture volume of a subsurface formation |
| 09/24/1991 | CA1289464C Perforate, test and sample tool and method of use |
| 09/24/1991 | CA1289463C Well fluid sampling apparatus |
| 09/18/1991 | CN1013980B Directional earth-filling method and apparatus for the deep-hole installation of a sensor |
| 09/17/1991 | US5049738 Laser-enhanced oil correlation system |
| 09/17/1991 | US5048348 Fluid flow volumetric determination apparatus and method |
| 09/17/1991 | US5048344 Borehole strain monitor for soft rock |
| 09/13/1991 | CA2037035A1 Method for the estimation of pore pressure within a subterranean formation |
| 09/10/1991 | US5046568 Driven groundwater sampling device |
| 09/10/1991 | CA1288614C Method and apparatus for measuring the bubble point of oil in an underground formation |
| 09/07/1991 | CA2037547A1 Method and apparatus for locating solvent injection apparatus within a natural gas wellbore |
| 09/03/1991 | WO1991012987A1 Self propelled probe, particularly for penetrating a powdered material |
| 09/03/1991 | US5045692 Simultaneous fluid flow and fluid density measurements using rotameter and nuclear technology |
| 09/03/1991 | CA2055461A1 Self-propelled probe, particularly for penetrating pulverulent materials |
| 08/27/1991 | US5042595 Method and device for in-situ determination of rheological properties of earth materials |
| 08/27/1991 | US5042297 Well-logging process and device in a non-flowing production well |
| 08/22/1991 | WO1991012411A1 Well fluid sampling tool and well fluid sampling method |
| 08/21/1991 | CN1053941A Self-drilling hydraulic piston type thin wall sail sampler |
| 08/20/1991 | US5040414 Analyzing a hydrocarbon reservoir by determining the response of that reservoir to tidal forces |
| 08/13/1991 | CA1287567C Circulation valve and method for operating the same |
| 08/12/1991 | CA2009782A1 In-situ tuned microwave oil extraction process |
| 08/09/1991 | CA2035932A1 Percussion core gun construction and cable arrangement |
| 08/07/1991 | CN1053656A Sampling tool for obtaining samples of fluids present in well |
| 08/06/1991 | US5036916 Method and apparatus for locating wet cement plugs in open bore holes |
| 08/06/1991 | US5036915 Controlling ph |
| 07/30/1991 | US5035149 Soil solution sampler |
| 07/24/1991 | EP0438307A2 Method of acoustic well logging |
| 07/23/1991 | US5033546 Production simulation process by pilot test in a hydrocarbon deposit |
| 07/16/1991 | US5031536 High temperature and pressure igniter for downhole percussion coring guns |
| 07/10/1991 | EP0436242A1 Method of analysing and controlling a fluid influx during the drilling of a borehole |
| 07/10/1991 | EP0436017A1 Analyzing a hydrocarbon reservoir by determining the response of that reservoir to tidal forces |
| 07/03/1991 | EP0435856A2 Multi-mode testing tool |
| 07/03/1991 | EP0435713A1 Apparatus to study the ageing of a circulating fluid under controlled conditions |
| 07/02/1991 | US5027897 Supplying solvent and hydrophilizing solution into well |
| 07/02/1991 | CA1285471C Well testing apparatus and methods |
| 06/26/1991 | CN1052530A Pore pressure prediction method |
| 06/25/1991 | CA1285213C Steam quality apparatus |
| 06/23/1991 | WO1991010132A1 A gas detection system |
| 06/23/1991 | CA2071988A1 Gas detection system |
| 06/21/1991 | WO1991009207A1 Sampling tool for obtaining samples of fluids present in a well |
| 06/21/1991 | CA2071953A1 Sampling tool for obtaining samples of fluids present in a well |
| 06/21/1991 | CA2032855A1 Device for analyzing aging of a flowing fluid, under imposed special conditions |
| 06/18/1991 | US5024110 Cell for sampling and storing fluid deposits |
| 06/05/1991 | EP0430317A2 Sampling of drilling mud |
| 05/29/1991 | EP0429078A1 Method and apparatus for measuring ground permeability |
| 05/28/1991 | US5018396 Cell assembly for determining conductivity and permeability |
| 05/28/1991 | US5018389 Rock-stress measuring method |
| 05/28/1991 | CA2029463A1 Sampling of drilling mud |
| 05/23/1991 | DE4000677A1 Geraet zur entnahme von bodenproben Geraet to earth sample |
| 05/21/1991 | US5016712 Method and apparatus for locating solvent injection apparatus within a natural gas wellbore |
| 05/16/1991 | DE4035585A1 Pump system for extracting liq. specimens - has small dia. pumps in series of acid-resistant material with acid-resistant connections |
| 05/08/1991 | EP0426232A2 Method of quantitative analysis of drilling fluid products |
| 05/08/1991 | EP0426231A2 Analysis of drilling solids samples |
| 05/07/1991 | US5012674 Method of exploration for hydrocarbons |
| 05/04/1991 | CA2029238A1 Programmed gelation of polymers using melamine resins |
| 04/29/1991 | CA2028053A1 Analysis of drilling solids samples |
| 04/29/1991 | CA2027496A1 Method of quantitative analysis of drilling fluid products |
| 04/23/1991 | US5010527 Method for determining the depth of a hydraulic fracture zone in the earth |
| 04/23/1991 | US5009100 Down hole reservoir fluid sampler |
| 04/18/1991 | WO1991005135A1 Phase fraction meter |
| 04/16/1991 | US5007488 Drilling nipple gas trap |
| 04/16/1991 | US5007277 Method for forming precision liquid/vapor separated bristle assembly |
| 04/16/1991 | CA1283041C Viscous oil recovery method |
| 04/10/1991 | CN1050618A Directly taking well wall picture method by sychronous slit scanning photography and its apparatus |