| 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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| 06/19/1996 | CN2229512Y Borehole internal spring detent type locator for rock and soil |
| 05/28/1996 | US5520248 Method and apparatus for determining the hydraulic conductivity of earthen material |
| 05/28/1996 | US5520046 Process for the chemical logging of a liquid and chemical logging installation for performing said process |
| 05/22/1996 | CN2227736Y Special pliers for geotome |
| 05/21/1996 | US5519214 Method for analysis of drilling fluids |
| 05/21/1996 | US5518073 Mechanical lockout for pressure responsive downhole tool |
| 05/21/1996 | US5517854 Methods and apparatus for borehole measurement of formation stress |
| 05/14/1996 | US5515932 Apparatus and method for environmental surveying for contaminants in alluvial materials and bedrock formations |
| 05/08/1996 | EP0710319A1 Method and device for detecting and/or measuring at least one geophysical parameter on a core sample |
| 04/30/1996 | US5511615 Method and apparatus for in-situ borehole stress determination |
| 04/30/1996 | US5511429 Method and system for measuring three-dimensional displacement |
| 04/25/1996 | WO1996012088A1 Well fluid sampling tool and well fluid sampling method |
| 04/16/1996 | US5507357 Pilot bit for use in auger bit assembly |
| 04/11/1996 | WO1996010683A1 A method for determining the reservoir properties of a solid carbonaceous subterranean formation |
| 04/10/1996 | EP0705941A1 Membrane apparatus with inclined piezometer |
| 04/03/1996 | EP0704598A2 Tool for use in a wellbore testing string |
| 04/02/1996 | US5503226 Process for recovering hydrocarbons by thermally assisted gravity segregation |
| 04/02/1996 | US5503031 Ground water sampling device |
| 04/02/1996 | US5503014 Method and apparatus for testing wells using dual coiled tubing |
| 03/31/1996 | CA2156129A1 Multi-mode well tool with hydraulic bypass assembly |
| 03/26/1996 | US5501273 Method for determining the reservoir properties of a solid carbonaceous subterranean formation |
| 03/26/1996 | US5501272 Multi-sensor relief valve well test system |
| 03/13/1996 | CN1118403A Non-focus electric current lateral well logging instrument |
| 03/12/1996 | US5497658 Method for fracturing a formation to control sand production |
| 03/06/1996 | EP0699819A2 Method and apparatus for well testing or servicing |
| 02/29/1996 | DE4430074A1 Stress measurement method for stone, rock or brickwork, esp. for constructing tunnel or other underground structure |
| 02/28/1996 | EP0698722A2 Method for testing low permeability formations |
| 02/21/1996 | EP0697502A1 Downhole tool for determination of formation properties |
| 02/21/1996 | EP0697501A2 Integrated well drilling and formation evaluation system |
| 02/21/1996 | EP0697500A2 Method and apparatus for the evaluation of formation pressure |
| 02/20/1996 | US5493226 Method and apparatus for measuring properties of core samples including heating and pressurizing the core sample and measuring the dynamic and static capillary pressure of water in the core sample |
| 02/15/1996 | WO1996004459A1 Locking a sample tube in a downhole hammer |
| 02/15/1996 | CA2180724A1 Locking a sample tube in a downhole hammer |
| 02/13/1996 | US5490561 Purge water management system |
| 02/07/1996 | CN1030936C Emergency rebound device for pushing device of stratigraphic measurer |
| 02/01/1996 | WO1996002734A1 Method for detecting pressure measurement discontinuities caused by fluid boundary changes |
| 01/30/1996 | US5487433 Core separator assembly |
| 01/30/1996 | US5487431 Subterranean fluid sampling systems and methods |
| 01/23/1996 | US5486695 Standoff compensation for nuclear logging while drilling systems |
| 01/23/1996 | US5485881 System for accessing liquid in a borehole |
| 01/18/1996 | WO1996001360A1 Soil sampler |
| 01/18/1996 | CA2194368A1 Soil sampler |
| 01/16/1996 | CA2062542C Method and apparatus for measuring three dimensional stress in rock surrounding a borehole |
| 01/11/1996 | WO1996000837A1 Use of a sampling apparatus for calibrating electronic mass flow/fraction meters, in a pipeline |
| 01/09/1996 | US5482122 Oriented-radial-cores retrieval for measurements of directional properties |
| 01/09/1996 | US5482119 Multi-mode well tool with hydraulic bypass assembly |
| 01/09/1996 | US5482116 Wellbore guided hydraulic fracturing |
| 12/26/1995 | US5477922 Method of evaluating the damage to the structure of rock surrounding a well |
| 12/26/1995 | CA1337787C Hydraulic system in formation test tools having a hydraulic pad pressure priority system and high speed extension of the setting pistons |
| 12/12/1995 | US5475309 Sensor in bit for measuring formation properties while drilling including a drilling fluid ejection nozzle for ejecting a uniform layer of fluid over the sensor |
| 12/12/1995 | US5473939 Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations |
| 12/07/1995 | WO1995033123A1 Method and device for detecting and/or measuring at least one geophysical parameter on a core sample |
| 12/07/1995 | DE19525643A1 Constant pressure fluid sample probe removal system for deep water sample |
| 11/28/1995 | US5469917 Use of capillary-membrane sampling device to monitor oil-drilling muds |
| 11/15/1995 | EP0682169A2 Pressur operated apparatus for use in high pressure well |
| 11/14/1995 | US5465628 For extracting fluid samples from a desired zone underground |
| 11/14/1995 | CA2148168A1 High pressure conversion for circulating/safety valve |
| 11/08/1995 | EP0681088A2 Annulus pressure responsive downhole tool |
| 10/31/1995 | US5463549 Method and apparatus for determining permeability of subsurface formations |
| 10/31/1995 | US5463164 Waste disposal in subterranean earth formations |
| 10/26/1995 | DE4413983A1 Single bore-hole test procedure |
| 10/24/1995 | US5460224 Well purge and sample apparatus and method |
| 10/18/1995 | CN2210251Y Borehole valve testing petroleum with three pin and inner spline |
| 10/18/1995 | CN1110366A High-pressure sampling method for physical sample in water |
| 10/17/1995 | US5458192 Method for evaluating acidizing operations |
| 10/17/1995 | CA2006766C Method and apparatus for sampling the gaseous content of a liquid |
| 10/12/1995 | WO1995027222A1 Acoustic sensor |
| 10/10/1995 | CA2034444C Method and apparatus for the determination of formation fluid flow rates and reservoir deliverability |
| 10/03/1995 | US5454275 Kabis discrete groundwater sampler |
| 09/28/1995 | WO1995025875A1 Milling tool |
| 09/28/1995 | WO1995025607A1 Waste disposal in subterranean earth formations |
| 09/26/1995 | US5453693 For measuring characteristics of materials contained in a cased well |
| 09/26/1995 | US5452761 Synchronized digital stacking method and application to induction logging tools |
| 09/26/1995 | US5452759 Whipstock system |
| 09/19/1995 | US5450900 Well fluid isolation and sample apparatus and method |
| 09/12/1995 | US5449045 To be driven into the ground to form a borehole |
| 09/05/1995 | US5447201 Well completion system |
| 08/29/1995 | US5445474 Pulsing remediation method |
| 08/29/1995 | US5445228 Method and apparatus for formation sampling during the drilling of a hydrocarbon well |
| 08/23/1995 | CN2205844Y Bulldozer of sampler for sampling soil |
| 08/22/1995 | US5444619 System and method of predicting reservoir properties |
| 08/22/1995 | US5443119 Method for controlling sand production from a hydrocarbon producing reservoir |
| 08/15/1995 | US5441110 System and method for monitoring fracture growth during hydraulic fracture treatment |
| 08/08/1995 | US5439065 Rotary sidewall sponge coring apparatus |
| 08/05/1995 | CA2115004A1 Pilot bit for use in auger bit assembly |
| 07/26/1995 | EP0543944B1 A method and an apparatus for taking and analysing level determined samples of pore gas/liquid from a subterranean formation |
| 07/25/1995 | US5435399 Soil sampler |
| 07/25/1995 | US5435176 Hazardous waste characterizer and remediation method and system |
| 07/11/1995 | US5432709 Computer control system for portable self-contained ground water testing assembly |
| 07/11/1995 | US5431227 Method for real time process control of well stimulation |
| 07/06/1995 | WO1995018289A1 Drilling method for detecting soil contamination by high-density liquid materials |
| 07/04/1995 | US5429187 Milling tool and operations |
| 06/29/1995 | WO1995017581A1 A method for real time process control of well stimulation |
| 06/29/1995 | CA2179024A1 A method for real time process control of well stimulation |
| 06/21/1995 | CA2116077A1 Rotatable wellhead equipment for logging through the annulus |
| 06/20/1995 | US5425429 Method and apparatus for forming lateral boreholes |
| 06/20/1995 | US5425417 Wellbore tool setting system |
| 06/14/1995 | EP0657621A1 Method and system for measuring three-dimensional displacement |
| 06/13/1995 | US5423229 Apparatus and method for draining high pressure fluid samples without mercury |
| 06/13/1995 | CA1335877C Apparatus and method for testing a well |