| Patents for E21B 47 - Survey of boreholes or wells (31,352) |
|---|
| 01/10/1991 | WO1991000414A1 Analyzing a hydrocarbon reservoir by determining the response of that reservoir to tidal forces |
| 01/10/1991 | WO1990014497A3 Process and device for transmitting data signals and/or control signals in a pipe train |
| 01/10/1991 | WO1990012196A3 Method and apparatus for monitoring well fluid parameters |
| 01/10/1991 | DE3922209A1 Measuring gas tightness of cased underground bore - measuring liquid level displaced by compressed gas |
| 01/08/1991 | US4984289 Apparatus for controlling underground excavator |
| 01/08/1991 | US4984221 Borehole acoustic logging system having automatic reflection signal level control |
| 01/08/1991 | CA1278747C Method of controlling permeability damage of hydrocarbon formations during steam injection using ammonium ions, bicarbonate ions, and potassium ions |
| 01/02/1991 | EP0405881A2 Inspection apparatus for tubular members |
| 01/01/1991 | US4982383 Monitoring the flow rate of fluid |
| 01/01/1991 | US4981037 Method for determining pore pressure and horizontal effective stress from overburden and effective vertical stresses |
| 12/30/1990 | CA2020055A1 Inspection apparatus for tubular members |
| 12/29/1990 | WO1991000413A1 Dynamometric measuring device for drill pipe |
| 12/27/1990 | EP0404669A1 Method and apparatus for conducting perforating operations in a well |
| 12/26/1990 | CN1048076A Method of managing prodn. well |
| 12/25/1990 | US4980682 Method of reducing noise in a borehole electromagnetic telemetry system |
| 12/25/1990 | US4980642 Detection of influx of fluids invading a borehole |
| 12/25/1990 | US4979563 Offset shock mounted recorder carrier including overpressure gauge protector and balance joint |
| 12/18/1990 | US4979151 Method and apparatus for investigating stand-off in a borehole |
| 12/18/1990 | US4979112 Method and apparatus for acoustic measurement of mud flow downhole |
| 12/15/1990 | CA2013862A1 Well unit dynamometer installation means and method |
| 12/13/1990 | WO1990015221A1 Moling system |
| 12/12/1990 | EP0402239A1 Device for extracting a liquid from a long pipe |
| 12/11/1990 | US4976143 System and method for monitoring drill bit depth |
| 12/11/1990 | US4976142 Borehole pressure and temperature measurement system |
| 12/11/1990 | CA1277589C Bundle type downhole guage carrier |
| 12/05/1990 | EP0400707A2 Method for determining dynamic flow characteristics of multiphase flows |
| 12/04/1990 | US4975979 Three phase motor control for downhole logging tools |
| 12/04/1990 | US4975645 Impedance cross correlation logging tool for two phase flow measurement |
| 12/04/1990 | US4974691 Down-hole bearing assemblies |
| 12/04/1990 | US4974682 For use on golf course greens |
| 12/04/1990 | US4974675 Method of fracturing horizontal wells |
| 12/04/1990 | US4974672 Gravel packing system for a production radial tube |
| 12/04/1990 | US4974452 Homogenizing and metering the flow of a multiphase mixture of fluids |
| 12/04/1990 | US4974446 Method and apparatus for analyzing a multi-phase flow in a hydrocarbon well |
| 12/04/1990 | CA1277411C Ultrasonic mine survey probe |
| 12/04/1990 | CA1277157C Process for measuring flow and determining the parameters of multilayer hydrocarbon-producing formations |
| 11/29/1990 | WO1990014497A2 Process and device for transmitting data signals and/or control signals in a pipe train |
| 11/28/1990 | EP0399987A1 Device and method for signal transmission in drill stems |
| 11/28/1990 | EP0399890A1 Apparatus for testing an oil well, and corresponding method |
| 11/28/1990 | CN2066487U Pressure and temp. double parameter tester for under well |
| 11/28/1990 | CN1047361A Method for determining length of empty froth section in machine-pumped oil well |
| 11/27/1990 | US4973226 Method and apparatus for controlling a well pumping unit |
| 11/27/1990 | US4972709 Pump control system, level sensor switch and switch housing |
| 11/27/1990 | US4972705 Liquid level detection |
| 11/27/1990 | US4972704 Method for troubleshooting gas-lift wells |
| 11/27/1990 | US4972703 Method of predicting the torque and drag in directional wells |
| 11/27/1990 | CA2017322A1 Method for determining dynamic flow characteristics of multiphase flows |
| 11/27/1990 | CA1277027C Antenna structure for use with a transmitter located at a great depth |
| 11/27/1990 | CA1276873C Formation fluid sampler |
| 11/22/1990 | EP0398581A2 Well logging telemetry |
| 11/20/1990 | US4972150 Plural coil induction device and method for determining in a borehole the azimuth and slope of a discontinuity layer in a homogeneous environment |
| 11/20/1990 | US4971160 Perforating and testing apparatus including a microprocessor implemented control system responsive to an output from an inductive coupler or other input stimulus |
| 11/20/1990 | US4971153 Method of performing wireline perforating and pressure measurement using a pressure measurement assembly disconnected from a perforator |
| 11/20/1990 | CA1276452C Device and method for the determination of fracture orientation in geological strata |
| 11/14/1990 | CN1010422B Drill pipes and castings utilizing mult-conduit tubulars |
| 11/13/1990 | US4970695 In situ calibration of a sensor |
| 11/13/1990 | US4970644 Reconfigurable well logging system |
| 11/06/1990 | US4968934 Magnetic marking apparatus for magnetically measuring displacement of a moveable element in a well |
| 11/06/1990 | US4967853 Wireline retrievable gauge system |
| 11/02/1990 | CA2012785A1 Rod mounted load cell |
| 10/31/1990 | EP0395499A2 Method and apparatus for the acoustic investigation of a casing cemented in a borehole |
| 10/31/1990 | EP0394617A1 Measuring system for determining the pressure of concrete |
| 10/30/1990 | US4966234 Method for determining the free point of a stuck drillstring |
| 10/30/1990 | US4966233 Tracer deployment tools |
| 10/30/1990 | CA1275696C Dipmeter processing technique |
| 10/29/1990 | CA2015420A1 Down-hole decelerators |
| 10/24/1990 | EP0394085A1 Method and device for measurement of multiphase flow, especially in oilwells |
| 10/24/1990 | CN2064411U Instrument for measuring x-y well diameter of oil elivery pipe |
| 10/24/1990 | CN2064410U Applience for winding-proof |
| 10/23/1990 | US4965774 Method and system for vertical seismic profiling by measuring drilling vibrations |
| 10/23/1990 | US4964462 Tubing collar position sensing apparatus, and associated methods, for use with a snubbing unit |
| 10/23/1990 | US4964460 Shut-in tool |
| 10/23/1990 | CA1275490C Method and apparatus for determining the profile of a subterranean passage |
| 10/18/1990 | WO1990012196A2 Method and apparatus for monitoring well fluid parameters |
| 10/17/1990 | EP0392237A2 Self-propelled boring ram |
| 10/17/1990 | EP0391899A1 Device for steering the direction of drilling |
| 10/17/1990 | CA2013586A1 Method and apparatus for measuring multi-phase flows, in particular in hydrocarbon wells |
| 10/16/1990 | US4964085 Non-contact borehole caliber measurement |
| 10/16/1990 | US4962665 Sampling resistivity of formation fluids in a well bore |
| 10/16/1990 | CA1275303C Wireline well test apparatus and method |
| 10/16/1990 | CA1275181C Fluid means for data transmission |
| 10/10/1990 | EP0390835A1 A method for recording multi-phase flows through a transport system. |
| 10/09/1990 | US4962490 Acoustic logging method for determining the dip angle and dip direction of a subsurface formation fracture |
| 10/02/1990 | US4960181 Method and device for improving the coefficient of transmission to geological formations of energy created by a well seismic source |
| 10/02/1990 | CA1274817A1 Steering and control system for percussion boring tools |
| 10/02/1990 | CA1274766A1 Measurement and intervention process and device in a well |
| 10/01/1990 | WO1990012195A1 Control device and process for drilling by vibration analysis |
| 09/27/1990 | DE4007907A1 Lenkvorrichtung fuer eine bohrerspitze in einem bohrloch Steering device for a drill tip in a borehole |
| 09/26/1990 | EP0389362A1 Method and apparatus for production logging in eruptive wells |
| 09/26/1990 | EP0388438A1 Measurement of corrosion with curved ultrasonic transducer; rule-based processing of full echo waveforms; preprocessing and transmitting echo waveform information |
| 09/26/1990 | CN2062760U Unit for collecting physical parameters of slurry |
| 09/25/1990 | US4958684 Steam injection profiling |
| 09/25/1990 | US4958517 Apparatus for measuring weight, torque and side force on a drill bit |
| 09/25/1990 | CA1274617A1 Device for receiving acoustic waves in a well |
| 09/25/1990 | CA1274469A1 Well test tool and system |
| 09/20/1990 | WO1990010781A1 Method of locating oil and gas horizons using a wellbore heat flow log |
| 09/19/1990 | EP0388316A2 A sonic well tool transmitter and receiver array including an attenuation and delay apparatus |
| 09/19/1990 | EP0388315A1 Process and device for logging using a sensor making a circumferential sweep of the wall of the borehole, in particular to calibrate this sensor |
| 09/19/1990 | EP0388265A1 Method and tool for gravel pack evaluation |
| 09/19/1990 | EP0387991A2 Surveying of boreholes |