Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 47 - Survey of boreholes or wells
Patents for E21B 47 - Survey of boreholes or wells (31,352)
03/1982
03/16/1982US4319633 Drill pipe tester and safety valve
03/09/1982US4319240 Electrical connector for borehole telemetry apparatus
03/09/1982US4318674 Automatic liquid level controller
03/09/1982CA1119686A1 System for extracting timing information from a modulated carrier
03/09/1982CA1119580A1 Logging while raising a drill string
03/09/1982CA1119423A1 Downhole cable tension measuring apparatus
03/03/1982EP0046651A2 Method and apparatus for obtaining selected samples of formation fluids
02/1982
02/23/1982US4317174 Riser angle positioning system and process
02/23/1982US4316386 Fluid pressure measuring apparatus for incorporation into a pipeline rising from a well
02/23/1982CA1118911A1 Method for ascertaining optimum location for well stimulation and/or perforation
02/16/1982US4316250 Dip determination by statistical combination of displacements
02/16/1982US4315656 Method for reducing porosity of rubblized oil shale
02/16/1982US4315417 Borehole logging tool cryostat
02/10/1982EP0045607A2 Method and apparatus of fracturation detection
02/10/1982EP0045418A2 Apparatus for testing oil pipes
02/09/1982US4314476 Well fluid velocity measurement method and system
02/02/1982US4314365 Acoustic transmitter and method to produce essentially longitudinal, acoustic waves
02/02/1982US4313342 Method and apparatus for determining vertical heat flux of geothermal field
02/02/1982US4313317 Borehole logging tool cryostat
02/02/1982CA1117411A1 Oil recovery prediction technique
01/1982
01/26/1982US4312223 Carrier system for positioning sensors adjacent a wire rope
01/26/1982US4312192 Borehole logging tool cryostat
01/26/1982CA1117001A1 Well testing method
01/26/1982CA1117000A1 Magnetic casing depth marker
01/19/1982US4312040 Well log depth aligning
01/19/1982CA1116431A1 Oil well instrumentation system
12/1981
12/29/1981US4307780 Angular whipstock alignment means
12/29/1981CA1115428A1 Water injection profiling by nuclear logging
12/29/1981CA1115427A1 Method and apparatus for measuring underground fluid flow characteristics
12/22/1981US4306447 Y-Ram tester
12/15/1981US4305277 Hydrostatic tester for plastic lined pipe and fiberglass pipe
12/08/1981US4304451 Interconnection technique for downhole instrumentation
12/08/1981US4304299 Method for setting and orienting a whipstock in a well conduit
12/01/1981US4303994 System and method for monitoring drill string characteristics during drilling
12/01/1981US4303975 Dipmeter displacement qualifying technique
12/01/1981US4302886 Gyroscopic directional surveying instrument
12/01/1981US4302881 Calibrated conduit caliper and method
11/1981
11/26/1981WO1981003382A1 Method and device for prospecting a well during drilling
11/24/1981US4302826 Resonant acoustic transducer system for a well drilling string
11/24/1981US4302757 Bore telemetry channel of increased capacity
11/17/1981CA1112636A1 Drill machine guidance using natural occurring radiation
11/17/1981CA1112558A1 Measuring casing coupler apparatus
11/17/1981CA1112557A1 Sampler and measurement apparatus
11/10/1981US4299709 Stabilized by an aromatic hydrocarbon
11/10/1981US4299253 Pulsation dampener
11/10/1981US4299123 Sonic gas detector for rotary drilling system
11/10/1981US4299033 Calipering tool
11/04/1981EP0039278A1 Apparatus for determining the stuck point of drill pipes in a borehole
11/03/1981US4298970 Borehole acoustic telemetry system synchronous detector
11/03/1981US4297880 Downhole pressure measurements of drilling mud
11/03/1981US4297790 Survey apparatus and method employing rate-of-turn and free gyroscopes
11/03/1981CA1111958A1 Digital motor control method and apparatus for measuring-while-drilling
10/1981
10/27/1981US4297699 Radar drill guidance system
10/27/1981CA1111239A1 Photoelectric borehole surveying apparatus with a magnetic compass
10/21/1981EP0037899A1 Method and device for measuring angles of inclination or a change of angles in a piling up or the like
10/21/1981EP0037821A1 Monitoring equipment for drilling operations
10/20/1981US4296321 Bit pressure gauge for well drilling
10/20/1981US4296318 Opto-electronic instrument for remote temperature measurement
10/20/1981US4295536 Pressure seal for pumping instruments through drill rod
10/20/1981US4295361 Drill pipe tester with automatic fill-up
10/13/1981US4294444 Pipe gripping vise
10/13/1981US4294318 Device for measuring the stresses applied in use to the downhole assembly of a drill pipe
10/06/1981US4293937 Borehole acoustic telemetry system
10/06/1981US4293936 Telemetry system
10/06/1981US4293046 Survey apparatus, method employing angular accelerometer
09/1981
09/29/1981US4292589 Determining defects in oil well casings
09/29/1981US4292588 Electromagnetic inspection tool for ferromagnetic casings
09/29/1981US4291978 Apparatus for automatically determining the position at which a beam of light impinges on a target
09/29/1981US4291581 Monitoring earth/rock movements
09/22/1981US4291395 Fluid oscillator
09/22/1981CA1109452A1 Measuring and transmitting apparatus for use in a drill string
09/22/1981CA1109292A2 Method and apparatus for logging inclined earth boreholes using the measured acceleration of the well logging instrument
09/15/1981US4289025 Sonde with rotatable pad for carrying out logging measurements in a borehole
09/15/1981US4289024 Well casing free-point indicator
09/15/1981US4289023 Percussion method and apparatus for the investigation of a casing cement in a borehole
09/15/1981CA1108892A1 Survey apparatus and method employing rate-of-turn and free gyroscopes
09/08/1981CA1108774A1 Methods and apparatus for determining dynamic flow characteristics of production fluids in a well bore
09/08/1981CA1108741A1 Determination of lateral dip in subterranean strata
09/08/1981CA1108435A1 Method and apparatus for logging inclined earth boreholes using the measured acceleration of the well logging instrument
09/03/1981WO1981002442A1 Riser angle positioning system and process
09/01/1981US4287415 By irradiation with high energy neutrons
09/01/1981US4286661 Equalizing valve for use in a well tool string
09/01/1981US4286461 Method and device for in situ detection of a mineral deposit fluid within a borehole
09/01/1981CA1107986A1 Sucker rod pump dynamometer
08/1981
08/25/1981US4286217 Device for electrode-type electrical logging tools and tool incorporating said device
08/25/1981US4285236 Rotary torque and rpm indicator for oil well drilling rigs
08/25/1981CA1107494A1 Rotating shoe probe for taking measurements in a well
08/18/1981US4284979 Coding system for simultaneously signaling selected ones of a plurality of devices
08/11/1981US4283780 Resonant acoustic transducer system for a well drilling string
08/11/1981US4282750 Process for measuring the formation water pressure within an oil layer in a dipping reservoir
08/11/1981CA1106958A1 Wellbore instrument hanger
08/05/1981EP0033192A1 A system for the acoustic propagation of data along a borehole drilling string
08/04/1981US4282588 Resonant acoustic transducer and driver system for a well drilling string communication system
08/04/1981US4282587 Method for monitoring the recovery of minerals from shallow geological formations
08/04/1981US4282523 Method and apparatus for logging inclined earth boreholes
08/04/1981US4281713 Method and apparatus for monitoring the position and movement progress of the flame front in an underground combustion
07/1981
07/28/1981US4280362 Peak reading bottom hole pressure instrument
07/28/1981CA1106050A1 Digital motor control method and apparatus for measuring-while-drilling
07/28/1981CA1106022A1 Well logging communication system
07/21/1981US4279299 Apparatus for installing condition-sensing means in subterranean earth formations
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