| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
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| 04/20/1988 | EP0263833A1 Magnetic transmission |
| 04/20/1988 | CN87205901U Digital work indicator for displaying pumping status of oil well |
| 04/19/1988 | US4739325 Apparatus and method for down-hole EM telemetry while drilling |
| 04/19/1988 | US4738812 Method of forming an electrode structure |
| 04/19/1988 | CA1235530A1 Behind casing water flow |
| 04/19/1988 | CA1235471A1 Method and means for determining the subsurface position of a blowing well with respect to a relief well |
| 04/19/1988 | CA1235372A1 Self-contained bore hole flow measurement system and method therefor |
| 04/19/1988 | CA1235313A1 Device for remote transmission of information |
| 04/13/1988 | EP0263772A2 Pump differential pressure monitor system |
| 04/13/1988 | CN87106795A Boring apparatus |
| 04/12/1988 | US4737636 Simultaneous neutron lifetime and oxygen activation and fluid sampling methods and apparatus to locate fluid flow in a cased well borehole |
| 04/12/1988 | US4736627 Steam profile liquid/vapor separator |
| 04/12/1988 | CA1235179A1 Drill stem logging system with electomagnetic waves using electrostatically shielded transmitter and receiver elements |
| 04/07/1988 | WO1988002435A1 Boring apparatus |
| 04/06/1988 | EP0263028A2 Method for cementation evaluation using acoustical coupling and attenuation |
| 04/06/1988 | EP0262882A2 Homing system for an in-ground boring device |
| 04/06/1988 | CN87105363A Auto anti-bounce system for micro-computer sound velocity logging |
| 04/05/1988 | US4736298 Method of detecting collars using computerized pattern recognition |
| 04/05/1988 | US4736204 Method and apparatus for communicating with downhole measurement-while-drilling equipment when said equipment is on the surface |
| 04/05/1988 | US4735264 High pressure gauge carrier |
| 04/05/1988 | CA1234870A1 Method for preventing the drilling of a new well into one of a plurality of production wells |
| 03/30/1988 | EP0261825A2 Method and apparatus for acoustic logging of boreholes |
| 03/30/1988 | EP0261291A1 Apparatus for shock protection in boreholes |
| 03/30/1988 | CN86106245A Pressure measuring device for submerged electric oil pump well |
| 03/30/1988 | CN86106244A Down-hole localized releasing apparatus for isotope carrier |
| 03/29/1988 | US4734893 Apparatus and method for transmitting downhole conditions to the surface |
| 03/29/1988 | US4734892 Method and tool for logging-while-drilling |
| 03/29/1988 | US4734860 Simplified bore hole surveying system by kinematic navigation without gyros |
| 03/29/1988 | US4733733 Method of controlling the direction of a drill bit in a borehole |
| 03/24/1988 | WO1988002109A1 System for sensing ions in aqueous solution |
| 03/23/1988 | EP0260902A2 Sequential hydraulic fracturing |
| 03/23/1988 | CN86105449A Method and instrument of adjacent spherical focussed log |
| 03/22/1988 | US4733380 Apparatus and method for acoustically investigating a casing set in a borehole |
| 03/22/1988 | US4733233 Method and apparatus for borehole fluid influx detection |
| 03/22/1988 | US4733232 Method and apparatus for borehole fluid influx detection |
| 03/22/1988 | US4732225 Deep-borehole drilling device with magnetic coupling |
| 03/15/1988 | US4731531 Method of logging a well using a non-radioactive material irradiated into an isotope exhibiting a detectable characteristic |
| 03/15/1988 | CA1233979A1 Bore-insertable apparatus for stationary measurement of bore-width changes in geological formations |
| 03/08/1988 | US4729429 Hydraulic pressure propelled device for making measurements and interventions during injection or production in a deflected well |
| 03/08/1988 | CA1233877A1 Borehole sensing tool with optical rotation sensor |
| 03/08/1988 | CA1233876A1 Well logging instrument including shock isolation system |
| 03/08/1988 | CA1233662A1 Method of and apparatus for the investigation of inaccessible subterranean spaces such as boreholes |
| 03/02/1988 | EP0257744A2 Drilling system |
| 03/02/1988 | EP0257155A1 Gun initiation and data recording downhole |
| 03/02/1988 | CN87205026U Probe of daul-purpose sliding nilometer |
| 03/01/1988 | US4727939 Tool for closing a production column in a well |
| 03/01/1988 | US4727749 Method and apparatus for leak testing of pipe |
| 03/01/1988 | CA1233317A1 Inclinometer |
| 02/24/1988 | EP0256796A2 Method and apparatus for controlled directional drilling of boreholes |
| 02/23/1988 | US4727489 Apparatus for analyzing the annulus effluent of a well |
| 02/23/1988 | US4726219 Method and system for determining fluid pressures in wellbores and tubular conduits |
| 02/17/1988 | EP0255976A2 Formation fluid sampler |
| 02/16/1988 | US4725837 Toroidal coupled telemetry apparatus |
| 02/16/1988 | US4725197 Devices for imparting rotary motion |
| 02/16/1988 | US4724905 Sequential hydraulic fracturing |
| 02/16/1988 | CA1232835A1 Well test apparatus and methods |
| 02/11/1988 | WO1988001096A1 Rotary signal coupler |
| 02/11/1988 | WO1988001012A1 Control unit for underground excavators |
| 02/10/1988 | EP0255513A1 Method and apparatus for data transmission in a well using a flexible line with stiffener |
| 02/09/1988 | US4724434 Method and apparatus using casing for combined transmission of data up a well and fluid flow in a geological formation in the well |
| 02/03/1988 | EP0122932B1 Well logging sleeve and method for making same |
| 02/02/1988 | US4722603 Interferometric means and method for accurate determination of fiber-optic well logging cable length |
| 02/02/1988 | US4722394 Determining residual oil saturation by radioactively analyzing injected CO2 and base-generating tracer-providing solution |
| 02/02/1988 | CA1232374A1 Solid plug of radioactive tracer material |
| 02/02/1988 | CA1232321A1 Method and apparatus for monitoring well tubing fluid |
| 01/26/1988 | US4721355 Optical cable connector assembly including breakable link and process using same |
| 01/20/1988 | EP0253477A1 Arrangement for the detection of high voltages |
| 01/20/1988 | CN87206291U Isotope underwell releasing instrument |
| 01/19/1988 | US4719803 Borehole extensometer for monitoring relative mass displacements |
| 01/19/1988 | CA1231642A1 Casing centralizer/stabilizer |
| 01/13/1988 | EP0252528A2 Improved drilling method and apparatus |
| 01/13/1988 | CN87204979U Seperatable laser direction finder |
| 01/12/1988 | US4718824 Usable device, in particular for the pumping of an extremely viscous fluid and/or containing a sizeable proportion of gas, particularly for petrol production |
| 01/12/1988 | US4718496 For isolating a damaged section of casing, isolating a formation |
| 01/12/1988 | US4718168 Cable length measurement correction system |
| 01/12/1988 | CA1231428A1 Simultaneous digitizing of all receivers in acoustic tool |
| 01/07/1988 | EP0251671A2 Method and apparatus for determining changes in length of a well logging cable |
| 01/07/1988 | EP0250526A1 Soil displacement hammer. |
| 01/05/1988 | US4718047 Analysis of cement bonding utilizing temperature profiles |
| 01/05/1988 | US4718027 Dynamically adjustable linear data discriminator |
| 01/05/1988 | US4718011 Well logging data acquisition, telemetry and control method and system |
| 01/05/1988 | US4717875 Method and system for determining curvature in fluid transmission pipelines |
| 01/05/1988 | CA1231134A1 Apparatus and method to communicate bidirectional information in a borehole |
| 01/05/1988 | CA1231044A1 Apparatus for monitoring a parameter in a well |
| 12/30/1987 | WO1987007955A1 Homogeneous fluoroassay methods employing fluorescent background rejection and water-soluble rare earth metal chelate fluorophores |
| 12/29/1987 | US4715451 Measuring drillstem loading and behavior |
| 12/29/1987 | US4715446 Device and method for the temporary protection of a working tool or measuring instrument fixed to the end of a drill string |
| 12/29/1987 | US4715443 Baffle system for conducting well treating operations |
| 12/29/1987 | US4715128 Curvature probe and method |
| 12/23/1987 | EP0250279A2 Method and apparatus for measuring the permeability of a land area |
| 12/23/1987 | EP0250144A2 Tubing tester valve |
| 12/23/1987 | EP0250107A2 Well bore measurement tool |
| 12/23/1987 | EP0250059A2 Method for determining fracture toughness of rock by core boring |
| 12/22/1987 | US4715022 Transmitting signals from within a well bore to the surface |
| 12/22/1987 | US4715002 System for recording a variable value, notably in a well, and for compressing stored measurement interval data |
| 12/22/1987 | US4714118 Technique for steering and monitoring the orientation of a powered underground boring device |
| 12/15/1987 | CA1230377A1 System for determining the free point of pipe stuck in a borehole |
| 12/08/1987 | US4712006 Steam quality measurement apparatus and method |
| 12/08/1987 | US4711305 Multi-mode testing tool and method of testing |
| 12/08/1987 | US4711303 Method and means for determining the subsurface position of a blowing well with respect to a relief well |