| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/16/1989 | US4830107 Well test tool |
| 05/16/1989 | US4830104 Actuation indicator for downhole tools |
| 05/16/1989 | US4829817 Soil-percolation testing method and apparatus |
| 05/16/1989 | US4829816 Method and apparatus for testing spotting fluids for releasing stuck drill pipe |
| 05/09/1989 | US4829488 Drive mechanism for borehole televiewer |
| 05/09/1989 | US4829486 Transmitting multiple borehole parameters in sonic logging |
| 05/09/1989 | US4828051 Method and apparatus for data transmission in a well using a flexible line with stiffener |
| 05/09/1989 | US4828050 Single pass drilling apparatus and method for forming underground arcuate boreholes |
| 05/09/1989 | US4828027 Apparatus for monitoring a parameter in a well |
| 05/09/1989 | US4827765 Motor driven spinner flow meter |
| 05/09/1989 | CA1253954A1 Transducer system for use with borehole televiewer logging tool |
| 05/03/1989 | EP0314654A1 Method and apparatus for transmitting data to the surface from an oil well |
| 05/03/1989 | EP0314475A1 Bore hole scanner |
| 05/03/1989 | EP0314249A2 Pump off/gas lock motor controller for electrical submersible pumps |
| 05/02/1989 | US4827457 Method and apparatus for acoustically measuring the transverse dimensions of a borehole |
| 05/02/1989 | US4825947 Apparatus for use in cementing a casing string within a well bore |
| 05/02/1989 | US4825946 Apparatus for monitoring a parameter in a well |
| 04/25/1989 | US4825421 Signal pressure pulse generator |
| 04/25/1989 | US4825073 Method for determining depth of penetration of radioactive tracers in formation fractures |
| 04/25/1989 | US4825072 Method and apparatus for determining well fluid flow velocity using a nonradioactive tracer |
| 04/25/1989 | US4823888 Apparatus for making a subterranean tunnel |
| 04/18/1989 | US4823125 Method and apparatus for stabilizing a communication sensor in a borehole |
| 04/18/1989 | US4821564 Method and system for determining fluid pressures in wellbores and tubular conduits |
| 04/18/1989 | US4821563 Apparatus for measuring weight, torque and side force on a drill bit |
| 04/12/1989 | CN1032380A Automatic multiparameter recorder for geology of well drilling |
| 04/12/1989 | CN1032379A Well logging apparatus using natural current and circular natural potential |
| 04/11/1989 | US4821035 Method and apparatus using a well casing for transmitting data up a well |
| 04/11/1989 | US4819726 Method for indicating the position of a cement wiper plug prior to its bottomhole arrival |
| 04/11/1989 | US4819336 Method of determining the orientation of a surveying instrument in a borehole |
| 04/06/1989 | WO1989002972A1 Methods for monitoring temperature-vs-depth characteristics in a borehole |
| 04/05/1989 | CN2035381U Magnetic positioning ring for petroleum sleeve |
| 04/04/1989 | USH614 Method to connect drill holes utilizing signalling devices |
| 04/04/1989 | US4817724 Diverter system test tool and method |
| 04/04/1989 | US4817716 Pipe connector and method of applying same |
| 04/04/1989 | US4817713 Steam injection profiling |
| 04/04/1989 | US4817711 System for recovery of petroleum from petroleum impregnated media |
| 04/04/1989 | US4817710 Apparatus for absorbing shock |
| 04/04/1989 | US4817437 Pressure communicating, fluid isolating interface |
| 03/29/1989 | EP0309030A1 Sinusoidal pressure pulse generator for measurement while drilling tool |
| 03/29/1989 | EP0203978B1 Process and system for monitoring wheel-type boring machines |
| 03/28/1989 | CA1251866A1 Method and apparatus for digitizing the maximum amplitude and time occurrence of an acoustic signal |
| 03/28/1989 | CA1251634A1 Magnetic single shot inclinometer |
| 03/23/1989 | WO1989002579A1 Method and system for controlling a mechanical pump to monitor and optimize both reservoir and equipment performance |
| 03/23/1989 | WO1989002512A1 Pressure sensor system |
| 03/22/1989 | CN2034682U Graduating installation of neutron well logging instrument |
| 03/21/1989 | US4814609 Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole |
| 03/21/1989 | US4813274 Method for measurement of azimuth of a borehole while drilling |
| 03/14/1989 | US4812977 Borehole survey system utilizing strapdown inertial navigation |
| 03/14/1989 | US4812812 Apparatus and method for determining the position and orientation of a remote object |
| 03/14/1989 | US4811814 Measuring device for a seismic profile within a well-bore |
| 03/14/1989 | US4811598 Downhole temperature measurements |
| 03/14/1989 | US4811597 Weight-on-bit and torque measuring apparatus |
| 03/09/1989 | WO1989002066A1 Multi-phase flowmeter |
| 03/08/1989 | CN2033853U Cable arranging device for testing under the winch of steel wire testing well |
| 03/07/1989 | US4809793 Enhanced diameter clean-out tool and method |
| 03/07/1989 | CA1250943A1 Drilling method and apparatus |
| 03/07/1989 | CA1250827A1 Method and apparatus for installment of underground utilities |
| 03/01/1989 | EP0305240A1 Method and device for modifying the transmission coefficient of the energy created by a borehole's seismic source towards geological formations |
| 03/01/1989 | EP0304988A1 Method and apparatus for producing pressure variations in a drilling fluid |
| 02/28/1989 | US4809237 Method for monitoring the goodness of the cement bond to a borehole casing |
| 02/28/1989 | US4808996 Simultaneous digitizing apparatus for an acoustic tool |
| 02/28/1989 | US4808925 Three magnet casing collar locator |
| 02/28/1989 | US4807717 Method of loggging an inclined wellbore |
| 02/28/1989 | US4807709 Fluid Powered drilling jar |
| 02/28/1989 | US4807469 Monitoring drilling mud circulation |
| 02/22/1989 | CN2033054U Rubber sealing grommet for oil well gaging hole plate |
| 02/22/1989 | CN1031282A Method and device for improving coefficient of transmission to geological formations of energy created by well seismic source |
| 02/21/1989 | US4807201 Groundwater pressure measurement |
| 02/21/1989 | US4806928 Apparatus for electromagnetically coupling power and data signals between well bore apparatus and the surface |
| 02/21/1989 | US4806869 An above-ground arrangement for and method of locating a discrete in ground boring device |
| 02/21/1989 | US4806153 Method and apparatus for investigating subsurface conditions |
| 02/21/1989 | US4805450 Measuring the mass flow rate of gas in a well |
| 02/21/1989 | US4805449 Apparatus and method for measuring differential pressure while drilling |
| 02/21/1989 | US4805448 Downhole pressure and/or temperature gauges |
| 02/15/1989 | EP0303352A2 The method of optically measuring relative angular movement |
| 02/15/1989 | CN2032652U Intellectualized test recorder for underground water lever and temp. |
| 02/15/1989 | CN2032651U Servo probe of depth sensor |
| 02/15/1989 | CN2032650U Device for preventing oil pipe from winding by cable or wire |
| 02/15/1989 | CN1031123A Drill pipes and castings utilizing mult-conduit tubulars |
| 02/14/1989 | US4805156 System for acoustically determining the quality of the cement bond in a cased borehole |
| 02/14/1989 | US4804051 Method of predicting and controlling the drilling trajectory in directional wells |
| 02/14/1989 | US4804042 Bottom hole shut-in tool |
| 02/14/1989 | US4803874 Device and method for determining the orientation of fractures in a geological formation |
| 02/14/1989 | US4803873 Process for measuring flow and determining the parameters of multilayer hydrocarbon producing formations |
| 02/14/1989 | CA1250057A1 Method for logging fluid flow rate, water fraction, and/or salinity of water flowing into a well |
| 02/08/1989 | EP0302632A1 Drill pipes and casings utilizing multi-conduit tubulars |
| 02/08/1989 | EP0302558A1 Method of analysing fluid influxes in hydrocarbon wells |
| 02/08/1989 | EP0302557A1 Method of controlling fluid influxes in hydrocarbon wells |
| 02/07/1989 | US4803667 Displaying the detailed contour of a borehole |
| 02/07/1989 | US4803483 Downhole pressure and temperature monitoring system |
| 02/07/1989 | US4803479 Electrical phase measurement means and method for accurate determination of well logging cable length |
| 02/07/1989 | US4802359 Tool for measuring pressure in an oil well |
| 02/07/1989 | CA1249875A1 Directional acoustic logger apparatus and method |
| 02/07/1989 | CA1249772A1 Drill stem testing system |
| 02/01/1989 | EP0301671A2 Method of magnetizing well tubulars |
| 01/31/1989 | US4802150 Mud pressure control system with magnetic torque transfer |
| 01/31/1989 | US4802145 Method and apparatus for determining cement conditions |
| 01/31/1989 | US4802143 Alarm system for measurement while drilling oil wells |
| 01/31/1989 | US4800753 Geomechanical probe for a drilling well |
| 01/31/1989 | US4800752 Use within a well bore |