| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 09/27/1988 | USRE32755 Accelerated downhole pressure testing |
| 09/27/1988 | US4774694 Well information telemetry by variation of mud flow rate |
| 09/27/1988 | US4774573 Method and apparatus for generating a video display from signals produced by borehole scanning |
| 09/21/1988 | CN88101914A Methods and apparatus for safely meaasuring downhole conditions and formation characteristics while drilling borehole |
| 09/20/1988 | US4771830 Apparatus for positioning well tools in deviated well bores |
| 09/20/1988 | US4771635 Fluid injector for tracer element well borehole injection |
| 09/20/1988 | CA1242244A1 Method and apparatus for communicating with downhole measurement-while-drilling equipment when said equipment is on the surface |
| 09/14/1988 | EP0282402A2 Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 09/14/1988 | EP0282232A2 Monitoring drilling mud circulation |
| 09/14/1988 | EP0281946A2 Tube wave attentuation method, system and apparatus for use in liquid-containing wells |
| 09/14/1988 | EP0281582A1 System for sensing ions in aqueous solution. |
| 09/13/1988 | US4771408 Universal mud pulse telemetry system |
| 09/13/1988 | US4770243 Device for regulating the rate of flow of water which is separated from its mixture with hydrocarbons and reinjected into the bottom of the well |
| 09/13/1988 | US4770034 Method and apparatus for data transmission in a well bore containing a conductive fluid |
| 09/07/1988 | EP0281481A1 A device for placing a radioactive source in a formation through which a borehole passes |
| 09/07/1988 | EP0281362A2 Pressure communicating apparatus |
| 09/07/1988 | EP0114865B1 Apparatus for determining borehole or cavity configuration through inert gas interface |
| 08/31/1988 | EP0280294A2 Test drill string for deep wells |
| 08/31/1988 | CN87215192U Device for measuring gas pressure of coal bed by drilling hole |
| 08/30/1988 | US4768152 Oil well bore hole surveying by kinematic navigation |
| 08/30/1988 | US4767280 Computerized controller with service display panel for an oil well pumping motor |
| 08/30/1988 | US4766764 Magnetic freepoint sensor utilizing spaced hall effect devices |
| 08/25/1988 | DE3708441C1 Method for the line-bound transmission of measurement data obtained in boreholes by means of a probe |
| 08/25/1988 | DE3703244A1 Device for data transmission in drill holes |
| 08/23/1988 | US4766577 Axial borehole televiewer |
| 08/23/1988 | US4766442 Antenna structure for use with a transmitter located at a great depth |
| 08/23/1988 | US4765435 Mobile well-logging laboratory |
| 08/23/1988 | US4765184 High temperature switch |
| 08/23/1988 | US4765183 Apparatus and method for taking measurements while drilling |
| 08/23/1988 | CA1241055A1 Method and apparatus for data transmission in a well bore containing a conductive fluid |
| 08/16/1988 | US4763734 Earth drilling method and apparatus using multiple hydraulic forces |
| 08/16/1988 | US4763520 Method and means for obtaining data representing a parameter of fluid flowing through a down hole side of an oil or gas well bore |
| 08/16/1988 | US4763519 Pressure actuator switch |
| 08/16/1988 | CA1240499A1 Method for the detection and correction of magnetic interference in the surveying of boreholes |
| 08/10/1988 | EP0277169A1 Rotary signal coupler |
| 08/09/1988 | US4763259 Method for programming an internal microprocessor |
| 08/09/1988 | US4763258 Method and apparatus for trelemetry while drilling by changing drill string rotation angle or speed |
| 08/09/1988 | US4762991 Probe for optically monitoring progress of in-situ vitrification of soil |
| 08/09/1988 | US4762473 Pumping unit drive system |
| 08/09/1988 | US4761889 Method for the detection and correction of magnetic interference in the surveying of boreholes |
| 08/03/1988 | CN87108005A Steam injection profiling |
| 08/02/1988 | US4760880 Combination anchor |
| 08/02/1988 | CA1239777A1 High temperature pressure sensing instrument and method |
| 07/26/1988 | US4759601 Fiber optic connector assembly |
| 07/26/1988 | US4759214 Method for determining fracture toughness of rock by core boring |
| 07/20/1988 | CN87211142U Ground simulator for measuring pressure and speed using charge |
| 07/19/1988 | US4757859 Apparatus for monitoring a parameter in a well |
| 07/19/1988 | US4757709 Flowmeter for use in a hydrocarbon well |
| 07/19/1988 | CA1239441A1 Method and apparatus for data transmission in a well using a flexible line with stiffener |
| 07/14/1988 | WO1988005114A1 Borehole survey system utilizing strapdown inertial navigation |
| 07/14/1988 | WO1988005113A1 Apparatus and method for gravity correction in borehole survey systems |
| 07/14/1988 | WO1988005112A1 Apparatus and method for determining the position of a tool in a borehole |
| 07/14/1988 | WO1988005108A1 Probe and its multidirectional anchoring device in a well |
| 07/13/1988 | EP0274457A2 Method and system for well bore data transmission |
| 07/13/1988 | EP0274207A1 Method for monitoring the operations of the rotary drilling of a well |
| 07/12/1988 | US4757479 Method and apparatus for cement bond logging |
| 07/12/1988 | US4756188 Method and apparatus for compensating for drilling line stretch in determining equipment depth in a well and for measurement of hookload on the traveling block of a drilling rig |
| 07/12/1988 | US4756088 Instruments for monitoring the direction of a borehole |
| 07/06/1988 | EP0273662A2 Natural tracer for secondary recovery water injection process |
| 07/06/1988 | EP0273379A2 Well data transmission system using a magnetic drill string |
| 07/06/1988 | CN86108843A Actual surveying of characteristic curve of enclosing rock and probe thereof |
| 07/05/1988 | US4755805 Current sensing alarm arrangement for monitoring the presence of high voltage |
| 07/05/1988 | US4755469 Oil tracing method |
| 07/05/1988 | US4754839 Well borehole salinity measurement using acoustic velocity |
| 07/05/1988 | US4754642 High temperature fluid flow speed detection apparatus |
| 07/05/1988 | CA1238849A1 Method and device enabling the taking of measurements and/or the undertaking of operations within a well |
| 06/29/1988 | EP0272320A1 Homogeneous fluoroassay methods employing fluorescent background rejection. |
| 06/22/1988 | EP0272073A2 System for surveying fluid transmission pipelines and the like |
| 06/21/1988 | CA1238389A1 Spinner transducer |
| 06/14/1988 | US4750561 Gravel packing system for a production radial tube |
| 06/08/1988 | CN87211360U Tri-defensible logging coupler |
| 05/31/1988 | US4747451 Level sensor |
| 05/31/1988 | US4747317 System for surveying fluid transmission pipelines and the like |
| 05/31/1988 | US4747304 Bundle carrier |
| 05/31/1988 | US4747303 Method determining formation dip |
| 05/24/1988 | US4745801 Groundwater sampling system |
| 05/17/1988 | US4744416 Directional acoustic logger apparatus and method |
| 05/17/1988 | US4744245 Acoustic measurements in rock formations for determining fracture orientation |
| 05/11/1988 | EP0267096A1 Tool for the measurement of the pressure in an oil well |
| 05/11/1988 | CN87211166U Double directional movable eccentric means of an oil well |
| 05/10/1988 | US4744030 Method and apparatus for measuring internal casing wear |
| 05/10/1988 | US4743761 Determining and comparing ratios of strontium isotopes in formation water and injected water; enhanced oil recovery |
| 05/10/1988 | US4742873 Subterranean flood tracer process |
| 05/03/1988 | US4742498 Pilot operated mud pulse valve and method of operating the same |
| 05/03/1988 | US4741397 Jet pump and technique for controlling pumping of a well |
| 05/03/1988 | US4741208 Pump differential pressure monitor system |
| 05/03/1988 | CA1236206A1 Borehole monitoring device and method |
| 04/27/1988 | EP0264511A1 Video camera for borehole inspection |
| 04/27/1988 | EP0160678B1 Improved drilling method and apparatus |
| 04/27/1988 | CN87203970U Turnable elastic pin |
| 04/27/1988 | CN87107613A Testing instrument for measuring water content of oil layer in oil wells |
| 04/26/1988 | US4740930 Surface processing and display of borehole televiewer signals |
| 04/26/1988 | US4740897 Memory operated well tools |
| 04/26/1988 | US4739841 Methods and apparatus for controlled directional drilling of boreholes |
| 04/26/1988 | US4739830 Acoustic Emission/Microseismic Activity |
| 04/26/1988 | US4739655 Method of automatically determining drilling fluid lag time while drilling a well |
| 04/26/1988 | US4739653 For measuring pressures in an oil well |
| 04/26/1988 | US4739652 Method of, and tubing and support apparatus for, arranging a tubing assembly for measuring purposes |
| 04/21/1988 | WO1988002807A1 Improved bundle carrier |
| 04/20/1988 | EP0264248A2 Method and apparatus for determining the profile of a subterranean passage |