| 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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| 04/26/1988 | US4739655 Method of automatically determining drilling fluid lag time while drilling a well |
| 04/26/1988 | US4739654 Method and apparatus for downhole chromatography |
| 04/21/1988 | WO1988002807A1 Improved bundle carrier |
| 04/12/1988 | US4737636 Simultaneous neutron lifetime and oxygen activation and fluid sampling methods and apparatus to locate fluid flow in a cased well borehole |
| 04/12/1988 | US4736798 Rapid cycle annulus pressure responsive tester valve |
| 04/12/1988 | US4736792 Pretreatment with a gas before steam injection |
| 04/12/1988 | US4736627 Steam profile liquid/vapor separator |
| 04/05/1988 | US4735269 Core monitoring device with pressurized inner barrel |
| 03/29/1988 | US4733725 Single well test for evaluating CO2 injection |
| 03/29/1988 | US4733568 Borehole dilatometer intensifier |
| 03/29/1988 | US4733567 Method and apparatus for measuring in situ earthen stresses and properties using a borehole probe |
| 03/24/1988 | WO1988002109A1 System for sensing ions in aqueous solution |
| 03/23/1988 | EP0260902A2 Sequential hydraulic fracturing |
| 03/23/1988 | CN86105449A Method and instrument of adjacent spherical focussed log |
| 03/09/1988 | CN86102973A Reversely-fitted circlip type self-controlling on and off long cylinder engineering geological soft soil-grit sampler |
| 03/01/1988 | US4727939 Tool for closing a production column in a well |
| 03/01/1988 | US4727936 Recovery and control system for leachate collection |
| 02/23/1988 | US4727489 Apparatus for analyzing the annulus effluent of a well |
| 02/17/1988 | EP0255976A2 Formation fluid sampler |
| 02/16/1988 | US4724905 Sequential hydraulic fracturing |
| 02/16/1988 | CA1232835A1 Well test apparatus and methods |
| 02/09/1988 | CA1232535A1 Borehole dilatometer intensifier |
| 01/26/1988 | US4721158 Fluid injection control system |
| 01/26/1988 | US4721157 Fluid sampling apparatus |
| 01/26/1988 | US4720996 For providing current power signals to an electric powered hydraulic system |
| 01/19/1988 | US4719803 Borehole extensometer for monitoring relative mass displacements |
| 01/12/1988 | US4718289 Drill cuttings sample collector |
| 01/05/1988 | US4717473 Apparatus for time-averaged or composite sampling of chemicals in ground water |
| 12/30/1987 | CN87205846U Impact hammer device for bottom of hole |
| 12/29/1987 | US4715443 Baffle system for conducting well treating operations |
| 12/29/1987 | CA1230824A1 Well tool with selective bypass functions |
| 12/23/1987 | EP0250279A2 Method and apparatus for measuring the permeability of a land area |
| 12/23/1987 | EP0250144A2 Tubing tester valve |
| 12/23/1987 | EP0250059A2 Method for determining fracture toughness of rock by core boring |
| 12/22/1987 | US4714119 Apparatus for hard rock sidewall coring a borehole |
| 12/17/1987 | WO1987007585A1 Transportation bottle for fluid/gas samples |
| 12/08/1987 | US4711305 Multi-mode testing tool and method of testing |
| 12/08/1987 | US4711123 Bundle type downhole gauge carrier |
| 12/01/1987 | US4710906 Method and system for monitoring the stability of boreholes |
| 12/01/1987 | CA1229906A1 Method for gathering and processng by a computer seismic data obtained at an exploration well |
| 11/24/1987 | US4708213 Hydraulic core cutting motor |
| 11/24/1987 | US4708212 Method and apparatus for optimizing determination of the originating depth of borehole cuttings |
| 11/24/1987 | CA1229505A1 Method and device for measuring steam quality |
| 11/19/1987 | EP0246024A2 Rapid cycle annulus pressure responsive tester valve |
| 11/17/1987 | CA1229242A1 Drill stem testing apparatus with multiple pressure sensing ports |
| 11/10/1987 | US4706225 Process for obtaining and processing seismic data measured at an exploratory well |
| 11/10/1987 | CA1229081A1 Method for optimizing rock drilling |
| 11/10/1987 | CA1229041A2 Multi-mode testing tool for use in a well bore |
| 11/10/1987 | CA1229040A2 Displacement valve for use in displacing fluid in a downhole tool |
| 11/10/1987 | CA1229039A2 Indexing assembly for a downhole tool |
| 11/10/1987 | CA1229038A2 Operating assembly for a downhole tool |
| 11/10/1987 | CA1229037A2 Ratchet assembly for transmitting movement in a downhole tool |
| 11/03/1987 | CA1228802A2 Operating assembly for a downhole tool |
| 11/03/1987 | CA1228801A2 Method of operating a multi-mode downhole tool |
| 11/03/1987 | CA1228800A1 Tool for use in a testing string disposed in a well bore |
| 11/03/1987 | CA1228751A1 Soil sample taker and vehicle mounting arrangement |
| 11/03/1987 | CA1228746A1 Gas detection in subterranean wells |
| 10/27/1987 | US4702327 Core sample taking bullet construction |
| 10/27/1987 | US4702168 Sidewall core gun |
| 10/27/1987 | CA1228532A2 Method of operating a multi-mode downhole tool |
| 10/21/1987 | EP0242262A1 Device for generating acoustic waves by percussion of a mass falling onto a target anchored in a borehole |
| 10/21/1987 | EP0242239A1 Tool for closing a well's production column |
| 10/21/1987 | CN87102757A Device for engendering acoustic waves by means of strike of falling mass on target anchored in well |
| 10/20/1987 | US4701107 Two stage pump sampler |
| 10/14/1987 | EP0241196A2 Annulus pressure responsive sampler valve |
| 10/14/1987 | CN87200554U Hydraulic probe for measuring characteristic curve of enclosing rock |
| 10/13/1987 | US4700140 Determination of water or residual oil saturation in earth formations independent of lithology |
| 10/13/1987 | US4699002 Process and apparatus for analyzing cuttings from oil and gas wells |
| 10/08/1987 | WO1987005974A1 Two stage pump sampler |
| 10/06/1987 | US4697650 Method for estimating formation characteristics of the exposed bottomhole formation |
| 09/30/1987 | EP0238601A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 09/30/1987 | CN86206707U Lifting basket free-valve type soft soil sampler |
| 09/29/1987 | US4696903 Method and apparatus for examining earth formations |
| 09/29/1987 | CA1227538A2 Electrode structure to measure borehole resistivity |
| 09/29/1987 | CA1227418A1 Formation sampling apparatus |
| 09/29/1987 | CA1227417A1 Method and apparatus for oil well measurements |
| 09/23/1987 | EP0237662A1 Downhole tool |
| 09/22/1987 | US4694903 Flapper type annulus pressure responsive tubing tester valve |
| 09/08/1987 | US4691779 Hydrostatic referenced safety-circulating valve |
| 09/08/1987 | US4691772 Process for obtaining permeability logs using radioactive drilling mud additives |
| 09/08/1987 | US4691558 Pressure pulse gelation test apparatus and method |
| 09/02/1987 | EP0235032A2 Fluid meter, especially for hydrocarbon wells |
| 09/01/1987 | US4690460 Power unit |
| 09/01/1987 | US4690216 Formation fluid sampler |
| 09/01/1987 | CA1226208A1 Jacquard fluid controller for a fluid sampler and tester |
| 08/25/1987 | CA1225850A1 Sampler for obtaining a sample representative of the fluid present in a well, and corresponding method |
| 08/19/1987 | EP0232576A1 Well tool for testing or treating a well |
| 08/19/1987 | EP0232248A1 Borehole stress-meter and method and apparatus for the installation thereof |
| 08/18/1987 | US4687057 Determining steam distribution |
| 08/18/1987 | US4687055 Wire-line controlled down-hole shut-in tool for wells |
| 08/18/1987 | US4686849 Method for determining mine roof competency |
| 08/13/1987 | WO1987004743A1 Remote underwater excavator and sampler |
| 08/12/1987 | EP0231685A1 Apparatus and method to evaluate the risk of a bore hole or well, which traverses a porous reservoir, in particular a geological formation, caving in |
| 08/12/1987 | EP0231571A2 Apparatus for testing rock characteristics |
| 08/11/1987 | US4686364 In situ determination of total carbon and evaluation of source rock therefrom |
| 08/11/1987 | US4685339 Soil sample taker and vehicle mounting arrangement |
| 08/11/1987 | US4685329 Assessment of drilling conditions |
| 08/11/1987 | US4685294 Viscosity-temperature compensator for hydraulic systems |
| 08/04/1987 | US4683947 Process and apparatus for monitoring and controlling the flammability of gas from an in-situ combustion oil recovery project |
| 08/04/1987 | CA1225016A1 Annular electrical contact apparatus for use in drill stem testing |