| 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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| 04/09/1991 | US5005643 Method of determining fracture parameters for heterogenous formations |
| 04/09/1991 | US5005406 Monitoring drilling mud composition using flowing liquid junction electrodes |
| 04/02/1991 | CA1282498C Determination of point of entry of fluid into a cased borehole |
| 03/28/1991 | DE3931293A1 Air sample extractor for measuring harmful material concn. in earth - has measuring arrangement connected to suction tube inside hollow conical probe of steel with air openings |
| 03/27/1991 | EP0419309A1 Apparatus for sampling a well fluid |
| 03/27/1991 | EP0418994A1 Well fluid and test method |
| 03/27/1991 | EP0418356A1 Process and device for taking samples at a ground water measurement site. |
| 03/26/1991 | US5002137 Moling system |
| 03/21/1991 | WO1991004500A1 Pore pressure prediction method |
| 03/21/1991 | CA2066760A1 Pore pressure prediction method |
| 03/20/1991 | EP0417936A2 Water-cut monitoring means and method |
| 03/20/1991 | EP0417885A2 Apparatus and method for analyzing well fluid sag |
| 03/20/1991 | EP0417369A1 Method and apparatus for logging a well below a downhole pump |
| 03/19/1991 | US5000051 Lysimeter probe which may be inserted into the ground |
| 03/13/1991 | CN1049915A Analyzing hydrocarbon reservoir by determining response of that reservoir to tidal forces |
| 03/13/1991 | CN1011994B Heatproof wall core explosive in well |
| 03/13/1991 | CA2020529A1 Water-cut monitoring means and method |
| 03/12/1991 | CA1281278C Sequential hydraulic fracturing |
| 03/07/1991 | WO1991002948A1 Combined separator and sampler |
| 03/05/1991 | CA1281118C Axial borehole televiewer |
| 03/01/1991 | CA2024039A1 Method for taking a sample representative of the fluid, in particular of the gas, from a well and a sampling device for practising this method |
| 03/01/1991 | CA2013238A1 Well fluid and test method |
| 02/27/1991 | CN2072151U High-temp high-pressure sampler |
| 02/26/1991 | CA1280740C Chip sampler |
| 02/24/1991 | CA2019505A1 Process for rapidly determining the solids content in drilling fluids |
| 02/20/1991 | EP0413628A1 Well testing apparatus |
| 02/19/1991 | US4994671 Apparatus and method for analyzing the composition of formation fluids |
| 02/19/1991 | US4993874 Method and apparatus for the collection of reduced gases |
| 02/19/1991 | US4993500 Automatic drive hammer system and method for use thereof |
| 02/19/1991 | CA1280292C Water sampling system |
| 02/14/1991 | DE3926133A1 Test line for rock permeability testing - has measurement bells and packers on tube sections with connecting lines to earth's surface |
| 02/08/1991 | CA2022680A1 Device for measuring properties of underground water and method therefor |
| 02/05/1991 | US4990773 Solvating, measuring emission fluorescence |
| 02/05/1991 | CA1279864C Method for determining the amount of oil in a sponge core |
| 01/29/1991 | US4987960 Well fluid and test method |
| 01/24/1991 | WO1991000951A1 Test method for boring |
| 01/23/1991 | EP0409304A1 Method of monitoring the drilling of a borehole |
| 01/23/1991 | CN1011347B Device for engendering acoustic waves by means of strike of falling mass on target anchored in well |
| 01/22/1991 | US4986120 Low-water-pressure controlled hydrologic test method |
| 01/17/1991 | DE3922379A1 Cut=off arrangement for artesian well - has shut=off valve in pipe packing which can be directly opened from sample extracting pipe above ground level |
| 01/15/1991 | US4984447 Soils percolation testing apparatus |
| 01/10/1991 | WO1991000414A1 Analyzing a hydrocarbon reservoir by determining the response of that reservoir to tidal forces |
| 01/10/1991 | DE3920709A1 Bore core investigation and evaluation esp. in stone coal mines - measuring and graphically displaying elastic parameter and point load axial resistance against bore depth |
| 01/02/1991 | CA1278510C Method for hydraulic fracture propagation in hydrocarbon bearingformations |
| 01/01/1991 | US4981037 Method for determining pore pressure and horizontal effective stress from overburden and effective vertical stresses |
| 01/01/1991 | US4981036 Rotating drill bit |
| 12/27/1990 | EP0403699A1 Method and apparatus for measurement of in-situ horizontal stress of non-coherent soil |
| 12/27/1990 | EP0403603A1 Membrane-sample container. |
| 12/25/1990 | US4980642 Detection of influx of fluids invading a borehole |
| 12/25/1990 | US4979576 Percussion core gun construction and cable arrangement |
| 12/25/1990 | US4979393 Process for rapidly determining the solids content in drilling fluids |
| 12/18/1990 | US4977961 Method of recovering hydrocarbons from a subterranean formation |
| 12/18/1990 | CA1278081C Device for generating acoustic waves by means of percussion in a well |
| 12/13/1990 | WO1990013731A3 Well control apparatus |
| 12/12/1990 | EP0402239A1 Device for extracting a liquid from a long pipe |
| 12/11/1990 | CA1277589C Bundle type downhole guage carrier |
| 12/10/1990 | WO1990015324A1 Method and device for in-situ measurement of ground heave characteristics |
| 12/10/1990 | CA2058981A1 Method and device for in-situ measurement of ground heave characteristics |
| 12/05/1990 | EP0401119A1 Method for characterising a primary layer |
| 12/05/1990 | EP0269670B1 Transportation bottle for fluid/gas samples |
| 12/04/1990 | US4974675 Method of fracturing horizontal wells |
| 12/04/1990 | CA1277157C Process for measuring flow and determining the parameters of multilayer hydrocarbon-producing formations |
| 11/28/1990 | EP0399889A1 Earth formation sampling and testing method and apparatus with filter means, and method for manufacturing such filter |
| 11/28/1990 | EP0399426A1 Method and apparatus for taking uncontaminated water samples from a well by drilling |
| 11/27/1990 | CA1276873C Formation fluid sampler |
| 11/24/1990 | WO1990014498A1 Process and device for obtaining unadulterated samples of water when sinking a well by drilling |
| 11/24/1990 | CA2033173A1 Process and device for obtaining unadulterated samples of water when sinking a well by drilling |
| 11/22/1990 | DE3915768A1 Extracting soil specimen from covering of deposit - ramming hollow core tube through all layers of covering whilst reducing mineral refilling |
| 11/14/1990 | EP0396534A1 A device for geotechnical or geological sampling |
| 11/06/1990 | US4969130 System for monitoring the changes in fluid content of a petroleum reservoir |
| 11/06/1990 | US4969111 Oil permeameter and method of measuring hydraulic conductivity |
| 11/06/1990 | CA1276007C Deflection apparatus |
| 11/06/1990 | CA1275914C Producing asphaltic crude oil |
| 10/29/1990 | WO1990013731A2 Well control apparatus |
| 10/23/1990 | US4964461 Enhanced oil recovery using a thickener with a rapid crosslinker and a delayed one |
| 10/23/1990 | US4964460 Shut-in tool |
| 10/18/1990 | WO1990012305A1 Process and device for taking samples at a ground water measurement site |
| 10/16/1990 | US4962668 Material stress monitor |
| 10/16/1990 | US4962665 Sampling resistivity of formation fluids in a well bore |
| 10/16/1990 | CA1275303C Wireline well test apparatus and method |
| 10/09/1990 | US4961343 Method for determining permeability in hydrocarbon wells |
| 10/04/1990 | DE3908930A1 Method for the removal of liquid and gaseous samples and for measuring their characteristic parameters |
| 10/04/1990 | CA2013726A1 Hydraulic impedance test method |
| 10/04/1990 | CA2013725A1 Fracture investigation by resonance sweeping technique |
| 10/03/1990 | EP0389956A1 Automatic drive hammer apparatus |
| 10/02/1990 | US4960181 Method and device for improving the coefficient of transmission to geological formations of energy created by a well seismic source |
| 10/02/1990 | CA1274766A1 Measurement and intervention process and device in a well |
| 09/26/1990 | CN2062760U Unit for collecting physical parameters of slurry |
| 09/25/1990 | USRE33349 Controlling sulfide scavenger content of drilling fluid |
| 09/25/1990 | CA1274469A1 Well test tool and system |
| 09/20/1990 | WO1990010778A1 A device for operations under water |
| 09/19/1990 | CN1009673B Dual purpose probe for measuring squirm and displacement inside sliding body |
| 09/18/1990 | CA1274101A1 Determination of steam quality in thermal injection wells |
| 09/11/1990 | US4955237 Method and apparatus for measurement of in-situ horizontal stress by freezing of the ground in-situ |
| 09/04/1990 | US4953618 Apparatus for use on a well |
| 09/04/1990 | US4953399 Method and apparatus for determining characteristics of clay-bearing formations |
| 08/29/1990 | EP0384792A2 Method and apparatus for measuring the coefficients of adhesion and viscosity of a drilling fluid |
| 08/28/1990 | US4953137 Method for determining earth stresses in formations surrounding a cased well |
| 08/28/1990 | US4951749 Earth formation sampling and testing method and apparatus with improved filter means |
| 08/28/1990 | US4951748 Technique for electrically heating formations |