| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 01/31/1989 | CA1249665A1 Method of sampling environmental conditions with a self-contained downhole gauge system |
| 01/31/1989 | CA1249662A1 Power conserving self-contained downhole gauge system |
| 01/25/1989 | EP0300627A1 Method and apparatus for stabilizing a communication sensor in a borehole |
| 01/25/1989 | CN2031440U Telecontrol tungsten alloy weighing rod |
| 01/24/1989 | US4800537 Method and apparatus for determining cement conditions |
| 01/24/1989 | US4800385 Well data transmission system using a magnetic drill string for transmitting data as a magnetic flux signal |
| 01/24/1989 | US4800104 Oil and gas well pipes, electrooptics |
| 01/24/1989 | US4799552 Method and apparatus for injecting radioactive tagged sand into oil and gas wells |
| 01/24/1989 | US4799391 Method for surveying fluid transmission pipelines |
| 01/18/1989 | EP0299863A2 Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
| 01/10/1989 | US4797822 Apparatus and method for determining the position of a tool in a borehole |
| 01/10/1989 | US4796708 Electrically actuated safety valve for a subterranean well |
| 01/10/1989 | US4796699 Well tool control system and method |
| 01/04/1989 | EP0297962A1 Flow restricting logging tool and method |
| 01/04/1989 | EP0297128A1 Apparatus and method for determining the position of a tool in a borehole |
| 01/04/1989 | CN2030255U Computerized oil well level detector |
| 01/03/1989 | US4794989 Well completion method and apparatus |
| 01/03/1989 | US4794791 Method and device for making measurements characterizing geological formations, in a horizontal borehole formed from an underground way |
| 01/03/1989 | CA1248249A1 Portable display and control terminal for wells |
| 01/03/1989 | CA1248213A1 Geomechanical probe for oil or gas wells |
| 12/28/1988 | EP0296788A2 Electrical conductor arrangements for pipe system |
| 12/28/1988 | EP0296204A1 Borehole survey system utilizing strapdown inertial navigation |
| 12/28/1988 | EP0167610B1 Multiple piezometer and application of such a piezometer |
| 12/28/1988 | CA1247719A Well production control system |
| 12/27/1988 | US4794322 Method, system, and tool for investigating borehole casings |
| 12/27/1988 | US4793414 Steam injection profiling |
| 12/27/1988 | US4793178 Method and apparatus for generating data and analyzing the same to determine fluid depth in a well |
| 12/21/1988 | EP0295923A2 Well fluid sampling apparatus |
| 12/21/1988 | EP0295922A2 Downhole tool and method for perforating and sampling |
| 12/21/1988 | EP0295297A1 Apparatus and method for gravity correction in borehole survey systems |
| 12/21/1988 | EP0295291A1 System for moving a set of instruments and measurements and/or interventions method in a well. |
| 12/21/1988 | CN88101897A Method for taking oilwell wall image directly and its tv pickup system |
| 12/20/1988 | US4792802 Telemetry system for borehole drilling |
| 12/20/1988 | US4792756 Method and apparatus for measuring axially extending defects in ferromagnetic elements |
| 12/20/1988 | US4791797 Density neutron self-consistent caliper |
| 12/20/1988 | CA1247196A1 Borehole televiewer dipmeter |
| 12/20/1988 | CA1246987A2 Multi-mode testing tool and method of testing |
| 12/14/1988 | EP0295178A2 System and method for communicating signals in a cased borehole having tubing |
| 12/14/1988 | EP0294811A2 High speed well surveying and land navigation |
| 12/14/1988 | EP0294440A1 Probe and its multidirectional anchoring device in a well. |
| 12/14/1988 | CN88103466A System for acquiring and recording signals delivered by set of sensors disposed in well probes |
| 12/13/1988 | US4791618 Well logging method and system for detecting structural and stratigraphic geological make-up of subsurface formations |
| 12/13/1988 | US4790394 Hydraulic drilling apparatus and method |
| 12/13/1988 | US4790393 Valve for drilling fluid telemetry systems |
| 12/13/1988 | US4790381 Centralizing devices for use in bore-holes |
| 12/13/1988 | US4790380 For monitoring well fluid characteristics |
| 12/13/1988 | US4790378 Well testing apparatus |
| 12/13/1988 | CA1246731A1 Method for estimating formation characteristics of exposed bottomhole formation |
| 12/07/1988 | EP0294284A1 System for acquiring and recording signals from a group of sensors situated in sounding wells |
| 12/07/1988 | EP0294225A2 Apparatus for measuring the formation resistivity in earth strata |
| 12/06/1988 | US4789032 Orienting and circulating sub |
| 12/06/1988 | US4788848 Chemical tracer determination of steam quality |
| 12/01/1988 | WO1988009560A1 Probe for optically monitoring progress of in-situ vitrification of soil |
| 11/30/1988 | CN88100168A Eccentric wellhead with two rotary systems |
| 11/29/1988 | US4788545 Parameter telemetering from the bottom of a deep borehole |
| 11/29/1988 | US4788544 Well bore data transmission system |
| 11/29/1988 | US4787465 Hydraulic drilling apparatus and method |
| 11/29/1988 | US4787463 Method and apparatus for installment of underground utilities |
| 11/29/1988 | US4787447 Well fluid modular sampling apparatus |
| 11/23/1988 | EP0291750A2 A method for transmitting tool face orientation data in a reduced time |
| 11/23/1988 | EP0131628B1 Method and apparatus for leak testing of pipe |
| 11/22/1988 | US4787093 Combinatorial coded telemetry |
| 11/22/1988 | US4786805 Reusable radioactive material shipping container including cartridge and injector |
| 11/17/1988 | WO1988008916A1 Restriction subs for setting cement plugs in wells |
| 11/17/1988 | EP0291005A2 Method and apparatus for logging deep wells which are curved or deviate in a horizontal direction |
| 11/17/1988 | EP0290939A2 Device for generating pressure pulses in drilling fluids |
| 11/17/1988 | EP0290938A2 Device for generating pressure pulses in a drilling fluid |
| 11/16/1988 | CN87213934U Multi-parameter recorder for drilling geology |
| 11/16/1988 | CN87210885U Rope drill winch with automatic depth measurement by wire rope line-up |
| 11/15/1988 | US4785300 Pressure pulse generator |
| 11/15/1988 | US4785247 Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements |
| 11/15/1988 | US4784229 Device, preferably for underground purposes, to transfer information out of a drilling hole |
| 11/15/1988 | US4783995 Logging tool |
| 11/08/1988 | US4783742 Apparatus and method for gravity correction in borehole survey systems |
| 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 | US4782694 Pressure communicating, fluid isolating interface |
| 11/08/1988 | CA1244551A1 Control method for a recording device |
| 11/02/1988 | EP0289103A2 Pipe connector and method of applying same |
| 11/02/1988 | CN87102992A Plate current logging device |
| 11/01/1988 | US4781062 Conjugate fracture systems and formation stresses in subterranean formations |
| 10/25/1988 | US4780862 Borehole televiewer |
| 10/25/1988 | US4780858 Borehole televiewer mudcake monitor |
| 10/25/1988 | US4780857 Method for logging the characteristics of materials forming the walls of a borehole |
| 10/25/1988 | US4780266 Irradiation with neutrons measurement of barium isotope |
| 10/25/1988 | US4779852 Vibration isolator and shock absorber device with conical disc springs |
| 10/19/1988 | CN88203346U Locator for connecting hoop |
| 10/19/1988 | CN88201543U Polar board of mini-ball focus logging equipment for small well |
| 10/19/1988 | CN88101924A Mehtod of computing formation dip and azimuth |
| 10/19/1988 | CN88101702A System for transmission of signals between reception assembly lowered into well and central and recording laboratory |
| 10/18/1988 | US4779201 Borehole scanner and sonde position locator for spectral analysis of wall |
| 10/18/1988 | US4778402 Thermos flask pressure housing |
| 10/11/1988 | CA1242878A1 Apparatus for measuring the transverse profile of a drill hole in a geologic formation |
| 10/11/1988 | CA1242876A1 High speed well surveying |
| 10/05/1988 | EP0285507A1 Signal transmission system between a receiver unit down in a borehole and a central control and receiving station |
| 10/05/1988 | EP0285473A1 Flapper pad arrangement for logging sonde |
| 10/04/1988 | US4775009 Process and device for installing seismic sensors inside a petroleum production well |
| 10/04/1988 | CA1242763A1 Parameter telemetering from the bottom of a deep borehole |
| 09/29/1988 | DE3708444A1 Method and device for the exact determination of the position of a drilling head in well-drilling |