| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 05/07/1985 | CA1186677A1 Method and means for drilling in rocks |
| 05/07/1985 | CA1186527A1 Test system |
| 04/24/1985 | EP0138271A1 Method and means for determining the subsurface position of a blowing well with respect to a relief well |
| 04/23/1985 | US4513403 Data encoding and synchronization for pulse telemetry |
| 04/23/1985 | US4512629 Optical fiber with hermetic seal and method for making same |
| 04/23/1985 | US4512186 Drill rate and gas monitoring system |
| 04/17/1985 | EP0137724A2 Simultaneous digitizing apparatus for an acoustic tool |
| 04/16/1985 | US4510797 Full-bore drill stem testing apparatus with surface pressure readout |
| 04/16/1985 | US4510696 Surveying of boreholes using shortened non-magnetic collars |
| 04/11/1985 | WO1985001586A1 Noise subtraction filter |
| 04/11/1985 | WO1985001585A1 Data encoding and synchronization for pulse telemetry |
| 04/09/1985 | US4509901 Method and apparatus for detecting problems in sucker-rod well pumps |
| 04/09/1985 | US4509552 Gas gun for determining the liquid level of a well |
| 04/09/1985 | US4509365 Detecting and analyzing faults in downhole equipment |
| 04/09/1985 | CA1185351A1 Borehole televiewer system using multiple transducer subsystems |
| 04/09/1985 | CA1185350A1 Method and apparatus for obtaining a display of a characteristic of the periphery of a borehole |
| 04/09/1985 | CA1185170A1 Determination of fracture closure pressure |
| 04/02/1985 | US4508182 Method and apparatus for controlling azimuthal drift of a drill bit |
| 04/02/1985 | US4508174 Downhole tool and method of using the same |
| 04/02/1985 | US4507958 Surveying of a borehole for position determination |
| 03/26/1985 | US4507552 Well logging apparatus |
| 03/26/1985 | US4507055 System for automatically controlling intermittent pumping of a well |
| 03/26/1985 | US4506745 Method and means for drilling in rocks |
| 03/26/1985 | US4506731 Apparatus for placement and retrieval of downhole gauges |
| 03/20/1985 | EP0134734A1 Oil well logging method and apparatus |
| 03/20/1985 | EP0134626A1 Determination of casing thickness using a gain stabilized gamma ray spectroscopy technique |
| 03/20/1985 | EP0134467A2 Target-directed drilling rod for rotating boring tools with flushing duct for underground mining |
| 03/19/1985 | US4506263 Data transmission system for logging tools |
| 03/19/1985 | US4506219 Borehole tool outrigger arm displacement control mechanism |
| 03/19/1985 | US4505155 Borehole pressure measuring system |
| 03/19/1985 | US4505048 Borehole survey instrument |
| 03/12/1985 | US4504736 Gamma ray spectral tool for borehole use |
| 03/05/1985 | US4502536 Submersible pump |
| 03/05/1985 | CA1183516A1 Method of preventing buckling in a drill string |
| 02/26/1985 | US4501325 Method for predicting workovers and shut-ins from analyzing the annulus effluent of a well |
| 02/26/1985 | US4501324 Tagging with halohydrocarbon |
| 02/26/1985 | US4501323 Method and apparatus for monitoring the corrosive effects of well fluids |
| 02/19/1985 | US4499959 Tooth configuration for an earth boring bit |
| 02/19/1985 | US4499956 Locking means for facilitating measurements while coring |
| 02/19/1985 | US4499955 Battery powered means and method for facilitating measurements while coring |
| 02/19/1985 | CA1182740A1 Well completion and testing system |
| 02/14/1985 | WO1985000635A1 Exploring for subsurface hydrocarbons by sea floor temperature gradients preferably using a multiplexed thermistor probe |
| 02/13/1985 | EP0132742A1 Method and apparatus for controlling azimuthal drift of a drill bit |
| 02/12/1985 | US4499563 Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device |
| 02/12/1985 | CA1182442A1 Method and apparatus for setting and orienting a whipstock in a well conduit |
| 01/30/1985 | EP0132423A1 Borehole logging and work-over method and apparatus |
| 01/29/1985 | US4496203 Drill pipe sections |
| 01/29/1985 | US4496174 Insulated drill collar gap sub assembly for a toroidal coupled telemetry system |
| 01/29/1985 | US4495808 Parachute profiler |
| 01/29/1985 | US4495805 In-situ permeability determining method |
| 01/29/1985 | US4495804 Method of and apparatus for mining analysis |
| 01/29/1985 | US4495803 Method of monitoring the growth of cuttings beds in angled well bores |
| 01/23/1985 | EP0131628A1 Method and apparatus for leak testing of pipe. |
| 01/22/1985 | US4495606 Method and apparatus for combined cement bond and acoustic well logging |
| 01/22/1985 | US4495605 Method for determining the dip angle of geological formations traversed by a borehole |
| 01/16/1985 | EP0131517A2 Arm mechanism supporting a borehole logging shoe |
| 01/15/1985 | US4494072 Well logging apparatus with replaceable sensor carrying insulating sleeve disposed in rotation restrained position around a drill string |
| 01/15/1985 | US4493999 Method of energy resolved gamma-ray logging |
| 01/15/1985 | US4493218 Transducer system employing a spring with linear characteristics |
| 01/08/1985 | US4492865 Borehole influx detector and method |
| 01/02/1985 | EP0129954A1 A passive temperature control system |
| 01/02/1985 | EP0129953A2 Method and apparatus for digitizing the maximum amplitude and time occurrence of an acoustic signal |
| 01/02/1985 | CA1180426A Control apparatus and method for an oil-well pump assembly |
| 01/01/1985 | US4491796 Borehole fracture detection using magnetic powder |
| 01/01/1985 | US4491738 Means for generating electricity during drilling of a borehole |
| 01/01/1985 | US4491022 Cone-shaped coring for determining the in situ state of stress in rock masses |
| 12/27/1984 | CA1180083A Ultrasensitive apparatus and method for detecting change in fluid flow conditions in a flowline of a producing oil well, or the like |
| 12/25/1984 | US4490788 Well-logging data processing system having segmented serial processor-to-peripheral data links |
| 12/25/1984 | US4490609 Method and apparatus for analyzing well fluids by photon irradiation |
| 12/25/1984 | US4490094 Method for monitoring an oil well pumping unit |
| 12/18/1984 | US4488747 Method and fishing tool apparatus for recovering objects from wells |
| 12/11/1984 | US4487261 Well completion and testing system |
| 12/11/1984 | US4487061 Method and apparatus for detecting well pump-off |
| 12/11/1984 | CA1179319A1 Apparatus for transmitting data from a borehole to the surface of the earth during the operation of a drilling device |
| 12/04/1984 | US4485563 Borehole survey instrument |
| 11/28/1984 | EP0126219A1 Borehole logging probe for the determination of formation constituents |
| 11/27/1984 | CA1178704A1 Separable drill hole transmitting device |
| 11/27/1984 | CA1178530A1 Positioning of deflection wedges |
| 11/22/1984 | WO1984004561A1 Test tool for subsea blowout preventer stack |
| 11/20/1984 | US4483397 Method and apparatus for monitoring well tubing fluid |
| 11/20/1984 | US4483394 Hydraulic power unit for measurement while drilling apparatus |
| 11/20/1984 | US4483393 Well logging apparatus and method for making same |
| 11/20/1984 | US4483188 Method and apparatus for recording and playback of dynagraphs for sucker-rod wells |
| 11/20/1984 | US4483187 Surface readout drill stem test control apparatus |
| 11/20/1984 | CA1178266A1 Technique for measuring weight-on-bit and torque |
| 11/14/1984 | EP0124696A1 Borehole logging probe for the determination of formation constituents |
| 11/13/1984 | US4482806 Method of determining flood sweep efficiency |
| 11/13/1984 | US4481714 For measuring the length of a string of tubular members |
| 11/13/1984 | CA1177948A1 Borehole measurement while drilling systems and methods |
| 11/08/1984 | WO1984004387A1 Apparatus and method for internally testing a plurality of interconnected pipe sections |
| 11/06/1984 | US4480960 Ultrasensitive apparatus and method for detecting change in fluid flow conditions in a flowline of a producing oil well, or the like |
| 11/06/1984 | US4480701 Locating the relative trajectory of a relief well drilled to kill a blowout well |
| 11/06/1984 | US4480690 Accelerated downhole pressure testing |
| 11/06/1984 | US4480391 Borehole survey instrument control circuitry |
| 11/06/1984 | CA1177571A1 Method for determining the attitude of geological formations crossed by a borehole |
| 10/31/1984 | EP0122932A1 Well logging sleeve and method for making same. |
| 10/30/1984 | US4479564 System and method for monitoring drill string characteristics during drilling |
| 10/30/1984 | US4479383 Well logging apparatus |
| 10/30/1984 | CA1177120A1 Method for determining distance and direction from an open well to a cased well using resistivity and directional survey data |
| 10/30/1984 | CA1176972A1 Logging method and apparatus using a sonde equipped with measuring pads |