| 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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| 02/07/1989 | CA1249772A1 Drill stem testing system |
| 02/01/1989 | EP0301734A2 Downhole circulation valve |
| 01/31/1989 | US4802144 Hydraulic fracture analysis method |
| 01/31/1989 | US4802143 Alarm system for measurement while drilling oil wells |
| 01/31/1989 | US4800753 Geomechanical probe for a drilling well |
| 01/26/1989 | DE3722653A1 Method of constructing a ground-water measuring point and device for carrying out the method |
| 01/24/1989 | US4799389 Tandem sampler actuation device |
| 01/17/1989 | US4799157 Method for uniquely estimating permeability and skin factor for at least two layers of a reservoir |
| 01/17/1989 | US4798244 Tool and process for stimulating a subterranean formation |
| 01/10/1989 | US4797821 Method of analyzing naturally fractured reservoirs |
| 01/10/1989 | CA1248441A1 Pressure operated test valve |
| 01/03/1989 | CA1248213A1 Geomechanical probe for oil or gas wells |
| 12/28/1988 | CN88211420U Piston type soil sampling device with thin wall |
| 12/27/1988 | US4793413 Method for determining formation parting pressure |
| 12/21/1988 | EP0295923A2 Well fluid sampling apparatus |
| 12/21/1988 | EP0295922A2 Downhole tool and method for perforating and sampling |
| 12/20/1988 | US4791822 Cell assembly for determining conductivity and permeability |
| 12/20/1988 | US4791797 Density neutron self-consistent caliper |
| 12/20/1988 | CA1246997A1 Determining steam distribution |
| 12/20/1988 | CA1246987A2 Multi-mode testing tool and method of testing |
| 12/15/1988 | WO1988009863A1 A device for geotechnical or geological sampling |
| 12/13/1988 | US4790933 Dynamic filtration unit and process of use |
| 12/13/1988 | US4790380 For monitoring well fluid characteristics |
| 12/13/1988 | US4790378 Well testing apparatus |
| 12/13/1988 | US4790180 Method for determining fluid characteristics of subterranean formations |
| 12/13/1988 | CA1246731A1 Method for estimating formation characteristics of exposed bottomhole formation |
| 12/07/1988 | EP0293767A2 Computer-controlled model for determining internal friction angle, porosity, and fracture probability |
| 12/06/1988 | CA1245978A1 Producing sour natural gas |
| 11/29/1988 | US4787983 Extraction with cycloalkanes, ethers, or freons" |
| 11/29/1988 | US4787447 Well fluid modular sampling apparatus |
| 11/29/1988 | US4787446 Inflatable packer and fluid flow control apparatus for wellbore operations |
| 11/22/1988 | US4785882 From a subterranean reservoir |
| 11/15/1988 | US4783995 Logging tool |
| 11/15/1988 | CA1244755A1 Borehole dilatometer with intensifier |
| 11/09/1988 | EP0289520A1 Remote underwater excavator and sampler. |
| 11/09/1988 | CN87212439U Angle measurer for rock core reset |
| 11/08/1988 | US4782899 Measuring oil saturation with gaseous oil tracers |
| 11/08/1988 | US4782898 Injecting solution of carbonate salt, an acid generating and a radioactive material; displacing solution; chromatographic separation |
| 11/08/1988 | US4782897 Multiple indexing J-slot for model E SRO valve |
| 11/08/1988 | US4782695 Method and apparatus for measuring the bubble point of oil in an underground formation |
| 11/02/1988 | CN87214736U Holding device for influent experiment of three-section rock core |
| 11/01/1988 | US4781062 Conjugate fracture systems and formation stresses in subterranean formations |
| 10/26/1988 | EP0288239A2 Perforating gun firing tool |
| 10/26/1988 | CN87102685A Directional earth-filling method and apparatus for the deep-hole installation of a sensor |
| 10/18/1988 | US4779200 Method for estimating porosity and/or permeability |
| 10/12/1988 | EP0286152A1 Matrix treatment process for oil extraction applications |
| 10/11/1988 | US4776210 Multiphase fluid flow measurement systems and methods |
| 09/27/1988 | US4773263 Method of analyzing vibrations from a drilling bit in a borehole |
| 09/27/1988 | CA1242388A1 Method for obtaining a dimensionless representation of well pressure data without the use of type-curves |
| 09/14/1988 | EP0282232A2 Monitoring drilling mud circulation |
| 09/14/1988 | EP0282231A2 Monitoring drilling mud |
| 09/14/1988 | EP0281582A1 System for sensing ions in aqueous solution. |
| 09/14/1988 | CN87101660A Heatproof wall sampling explosive |
| 09/13/1988 | US4770268 Device for generating acoustic waves by means of a falling mass striking a target element anchored in a well |
| 09/07/1988 | WO1988006739A1 Process and device for establishing the cohesion curve of an ocean floor at great depth |
| 09/06/1988 | US4768591 Steam quality apparatus |
| 08/31/1988 | EP0280294A2 Test drill string for deep wells |
| 08/30/1988 | US4766955 Wellbore fluid sampling apparatus |
| 08/25/1988 | WO1988004352A3 Process for making a well |
| 08/24/1988 | CN86210263U Ignition-delay emitter for borehole wall core tool |
| 08/23/1988 | US4766577 Axial borehole televiewer |
| 08/23/1988 | US4765415 For increasing the drilling rate and drilling kife of a drill bit |
| 08/23/1988 | US4765182 For determining a direct quantitative measure of hydrocarbon reserves |
| 08/17/1988 | EP0278616A2 Method of determining a safe value of density for a drilling fluid |
| 08/09/1988 | US4761997 Ground water well dimensioning procedure |
| 08/03/1988 | EP0276228A1 Two stage pump sampler |
| 08/02/1988 | US4760881 Downhole steam sampler |
| 08/02/1988 | US4760741 Borehole dilatometer with intensifier |
| 08/02/1988 | CA1239869A1 Groundwater monitoring system |
| 07/26/1988 | US4759214 Method for determining fracture toughness of rock by core boring |
| 07/26/1988 | CA1239547A1 Method for the determination of at least one value caracterizing a geological formation, to wit the hardness of said formation |
| 07/20/1988 | CN87211142U Ground simulator for measuring pressure and speed using charge |
| 07/19/1988 | US4757709 Flowmeter for use in a hydrocarbon well |
| 07/12/1988 | US4756189 Method and apparatus for determining characteristics of clay-bearing formations |
| 07/12/1988 | CA1239088A1 Method for controlling water coning in oil wells |
| 06/28/1988 | US4753292 Method of well testing |
| 06/22/1988 | CN87215061U Hollow screw type soil taking driller |
| 06/22/1988 | CN86107959A Dual purpose probe for measuring squirm and displacement inside sliding body |
| 06/21/1988 | US4752882 Method for determining the effective water saturation in a low-resistivity hydrocarbon-bearing rock formation based upon rock matrix conductance |
| 06/16/1988 | WO1988004352A2 Process for making a well |
| 06/14/1988 | US4751646 Method for determining original saturations in a produced field |
| 06/14/1988 | US4750570 Formation sampling bullet and cables therefor |
| 06/08/1988 | EP0269670A1 Transportation bottle for fluid/gas samples. |
| 06/07/1988 | US4749038 Method of designing a fracturing treatment for a well |
| 06/07/1988 | US4748849 Apparatus for dynamically measuring fluid loss characteristics |
| 05/31/1988 | US4747304 Bundle carrier |
| 05/31/1988 | US4747303 Method determining formation dip |
| 05/24/1988 | US4745975 Water well completion apparatus and method of use |
| 05/24/1988 | US4745802 Formation testing tool and method of obtaining post-test drawdown and pressure readings |
| 05/24/1988 | US4745801 Groundwater sampling system |
| 05/24/1988 | CA1237068A1 Well tool with improved valve support structure |
| 05/17/1988 | US4744245 Acoustic measurements in rock formations for determining fracture orientation |
| 05/17/1988 | CA1236910A1 Downhole fracture analysis |
| 05/17/1988 | CA1236769A1 Downhole tool with compressible well fluid chamber |
| 05/17/1988 | CA1236768A1 Downhole tool with compression chamber |
| 05/11/1988 | EP0267096A1 Tool for the measurement of the pressure in an oil well |
| 05/03/1988 | US4742496 Method of evaluating gravel packs |
| 05/03/1988 | US4742459 Method and apparatus for determining hydraulic properties of formations surrounding a borehole |
| 05/03/1988 | CA1236002A1 Bottom hole sampler and safety valve and valve therefor |
| 04/26/1988 | US4739830 Acoustic Emission/Microseismic Activity |