| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 08/11/1987 | CA1225433A1 Surveying of boreholes using shortened non-magnetic collars |
| 08/04/1987 | US4685092 Method and apparatus for the acoustic inspection of a borehole fitted with casing |
| 08/04/1987 | US4684947 Simultaneous digitizing apparatus for an acoustic tool |
| 08/04/1987 | US4684946 Device for transmitting to the surface the signal from a transmitter located at a great depth |
| 08/04/1987 | US4683947 Process and apparatus for monitoring and controlling the flammability of gas from an in-situ combustion oil recovery project |
| 08/04/1987 | CA1225016A1 Annular electrical contact apparatus for use in drill stem testing |
| 08/04/1987 | CA1224937A1 Well plug quality testing |
| 07/29/1987 | CN87100310A Process and device for installing seismic sensors inside petroleum production well |
| 07/29/1987 | CN86208794U Digital air-gauge |
| 07/28/1987 | USRE32463 Method of and apparatus for telemetering information from a point in a well borehole to the earth's surface |
| 07/28/1987 | US4682421 Method for determining the azimuth of a borehole |
| 07/28/1987 | CA1224874A1 Borehole inertial guidance system |
| 07/21/1987 | US4681160 Apparatus for securing a measurement-while-drilling (MWD) instrument within a pipe |
| 07/14/1987 | US4679669 Shock absorber |
| 07/08/1987 | EP0228134A2 Axial borehole televiewer |
| 07/07/1987 | US4678035 Methods and apparatus for subsurface testing of well bore fluids |
| 07/07/1987 | CA1223808A1 Method for operating an injection well in an in-situ combustion oil recovery process using oxygen |
| 07/07/1987 | CA1223807A1 Method and apparatus for determining formation pressure |
| 07/02/1987 | WO1987004028A1 Magnetic transmission |
| 07/02/1987 | WO1987003924A1 Soil displacement hammer |
| 07/01/1987 | EP0227456A2 Earth well drilling apparatus |
| 07/01/1987 | EP0227191A2 Steam profile liquid/vapour separator |
| 07/01/1987 | CN86105110A System and method for data processing |
| 06/30/1987 | US4676724 Mud pump |
| 06/30/1987 | US4676664 Exploring for subsurface hydrocarbons by sea floor temperature gradients preferably using a multiplexed thermistor probe |
| 06/30/1987 | US4676310 Apparatus for transporting measuring and/or logging equipment in a borehole |
| 06/30/1987 | CA1223675A1 Probe for insertion into drill holes for the purpose of locating mineral deposits |
| 06/30/1987 | CA1223521A1 Linear shear valve |
| 06/24/1987 | CN85108986A Method for temp. measuring of small-sized well |
| 06/23/1987 | US4675852 Apparatus for signalling within a borehole while drilling |
| 06/23/1987 | US4674579 Method and apparatus for installment of underground utilities |
| 06/23/1987 | US4674328 Method and apparatus for determining subsurface conditions using a tubing packoff tool |
| 06/16/1987 | US4673890 Well bore measurement tool |
| 06/16/1987 | US4673652 Method of testing and reconditioning insulating tubular conduits |
| 06/16/1987 | US4673312 Method and apparatus for the underground installation of pipelines |
| 06/16/1987 | US4672845 Polish rod temperature sensing system and rod stroking control |
| 06/16/1987 | US4672752 Method of determining the difference in borehole azimuth at successive points |
| 06/16/1987 | EP0225754A2 Downhole gauge carrier |
| 06/16/1987 | CA1222882A1 Mud turbine tachometer |
| 06/03/1987 | CN85109114A Parameter telemetering from bottom of deep borehole |
| 06/02/1987 | US4670862 Apparatus for producing geophysical measurements in a borehole |
| 06/02/1987 | US4669537 Well test tool and system |
| 06/02/1987 | CA1222505A1 Targetable drill with pressure telemetering of drill parameters |
| 06/02/1987 | CA1222444A1 Method of firing perforating gun and simultaneously recording downhole pressure |
| 05/27/1987 | EP0223550A2 Downhole clock spring |
| 05/26/1987 | US4669068 Power transmission apparatus for enclosed fluid systems |
| 05/26/1987 | US4667739 Thermal drainage process for recovering hot water-swollen oil from a thick tar sand |
| 05/19/1987 | US4666375 Pumping system |
| 05/19/1987 | US4665995 Wedging assembly for borehole steering or branching |
| 05/19/1987 | US4665984 Method of measuring crustal stress by hydraulic fracture based on analysis of crack growth in rock |
| 05/19/1987 | US4665981 Method and apparatus for inhibiting corrosion of well tubing |
| 05/19/1987 | CA1222052A1 Device for the determination of a mobile component's position, and drilling apparatus making use of said device |
| 05/13/1987 | EP0221756A2 Dynamically adjustable linear data discriminator |
| 05/12/1987 | US4665511 System for acoustic caliper measurements |
| 05/12/1987 | US4665398 Method of sampling and recording information pertaining to a physical condition detected in a well bore |
| 05/12/1987 | US4664531 Downhole clock spring |
| 05/12/1987 | US4664189 Method and device for carrying out measurements and operations in a well |
| 05/12/1987 | CA1221629A1 Fluorocarbon tracers and tracing method |
| 05/05/1987 | US4663628 Method of sampling environmental conditions with a self-contained downhole gauge system |
| 05/05/1987 | US4662458 Method and apparatus for bottom hole measurement |
| 05/05/1987 | US4662442 Process and device for casing a borehole for the measurement of the interstitial pressure of a porous medium |
| 05/05/1987 | US4662218 Well logging device and method |
| 05/05/1987 | US4662209 Course length measurement |
| 05/05/1987 | CA1221476A1 Probe for insertion into drill holes for the purpose of locating mineral deposits |
| 04/29/1987 | EP0220047A2 Borehole logging equipment |
| 04/29/1987 | CN85108732A Method and apparatus for communicating between spaced locations in a borehole |
| 04/28/1987 | US4661933 Method and apparatus for acoustically measuring the transverse dimensions of a borehole |
| 04/28/1987 | US4660928 High tensile strength optical fiber |
| 04/28/1987 | US4660656 Method and apparatus for controlling the rotational torque of a drill bit |
| 04/28/1987 | US4660638 Downhole recorder for use in wells |
| 04/28/1987 | CA1221025A1 Apparatus for signalling within a borehole while drilling |
| 04/23/1987 | DE3537673A1 Method for detecting, storing and saving measurement data which are obtained in well holes with high ambient temperature |
| 04/22/1987 | CN86106539A Improvements in or relating to logging equipment |
| 04/21/1987 | US4659925 High pressure well radioisotope injection system |
| 04/21/1987 | US4659530 Pressurized molding, depressurizing, collapse and retrieval of mold and tool |
| 04/14/1987 | US4657387 Method of and apparatus for the investigation of inaccessible subterranean spaces such as boreholes |
| 04/14/1987 | US4657078 Method and device for testing a well bore packer |
| 04/09/1987 | WO1987002095A1 Gauge carrier for incorporation into tubing for flow-testing of oil and gas exploration wells |
| 04/09/1987 | DE3534661A1 Drilling head, in particular for a horizontal drilling appliance |
| 04/08/1987 | EP0217684A1 Process for measuring flow and determining the parameters of multilayer hydrocarbon-producing formations |
| 04/08/1987 | EP0216805A1 Method and means for obtaining data representing a parameter of fluid flowing through a down hole side of an oil or gas well bore |
| 04/07/1987 | US4655289 Remote control selector valve |
| 04/07/1987 | CA1220176A1 High pressure well radioisotope injection system |
| 04/01/1987 | EP0216554A2 Well tool valve with hydraulic latch |
| 04/01/1987 | EP0215880A1 Hydraulic power supply for use during well drilling operations |
| 03/24/1987 | US4652876 Remote switch position determination using constant current signaling |
| 03/18/1987 | EP0214554A2 Down-hole device for transmitting information from a well |
| 03/17/1987 | US4651101 Induction logging sonde with metallic support |
| 03/17/1987 | US4649993 Combination electrically operated solenoid safety valve and measuring sensor |
| 03/11/1987 | EP0214037A2 System and method for data processing |
| 03/11/1987 | EP0213806A2 Perforation flow identification tool |
| 03/10/1987 | US4649550 Telemetry scheme with slope modulated signal |
| 03/10/1987 | US4649349 Device for automatically compensating the magnetism of drill string members |
| 03/10/1987 | US4649344 Test circuit for detector used in well bore |
| 03/10/1987 | US4648444 Tensile ring cable head assembly |
| 03/10/1987 | CA1219078A1 Exploring for subsurface hydrocarbons by sea floor temperature gradients preferably using a multiplexed thermistor probe |
| 03/04/1987 | EP0211935A1 Method and apparatus for data transmission in a well bore containing a conductive fluid |
| 03/03/1987 | US4647853 Mud turbine tachometer |
| 03/03/1987 | US4646832 Chromatographically analyzing |
| 03/03/1987 | US4646831 Precision connector for well instrumentation |