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)
11/1982
11/09/1982US4357992 Fluid pressurization apparatus and technique
11/02/1982US4357660 Formation dip and azimuth processing technique
11/02/1982US4356629 Method of making well logging apparatus
11/02/1982CA1134680A1 Piping leakage detection method and apparatus
10/1982
10/26/1982CA1134257A1 System for measuring downhole drilling forces
10/26/1982CA1134175A1 Device for determining the pore water pressure in a soil
10/19/1982US4355378 Logging system depth recorder
10/19/1982US4355310 Well logging communication system
10/19/1982US4355307 Safety stress shutdown switch
10/19/1982US4354553 Corrosion control downhole in a borehole
10/12/1982US4353249 Method and apparatus for in situ determination of permeability and porosity
10/12/1982US4353244 Method of determining the azimuth and length of a deep vertical fracture in the earth
10/05/1982US4352376 Controller for well installations
10/05/1982CA1132970A2 Measuring while drilling tool
10/05/1982CA1132782A1 Tracer fluids for enhanced oil recovery
09/1982
09/30/1982WO1982003277A1 Point gap assembly for a toroidal coupled telemetry system
09/28/1982US4351186 Apparatus for conduit free-point detection in boreholes
09/28/1982US4351116 Apparatus for making multiple orientation measurements in a drill string
09/28/1982CA1132723A1 Push drill guidance apparatus
09/21/1982US4351037 Systems, apparatus and methods for measuring while drilling
09/21/1982US4351027 Adaptive riser angle position reference system
09/14/1982US4349072 Method and apparatus for conducting logging or perforating operations in a borehole
09/14/1982US4348897 Method and device for determining the transmissibility of a fluid-conducting borehole layer
09/14/1982CA1131463A1 Method of fracturation detection
09/07/1982US4348748 Dipmeter displacement processing technique
09/07/1982US4348672 Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
09/07/1982US4348671 Dual spectra well logging system
09/07/1982US4347736 Continuous borehole-logging method
09/07/1982US4347733 Blowout preventor test system
09/07/1982CA1131208A1 Pressure pulse detection apparatus
08/1982
08/31/1982US4346594 Method for locating the depth of a drill string washout or lost circulation zone
08/31/1982US4346591 Sensing impending sealed bearing and gage failure
08/24/1982US4346462 Seismic prospecting method providing for the determination of the flank dip of subterranean layers and device for carrying out the same
08/24/1982US4345657 Electronic depth indicator for hydraulic drilling machines
08/24/1982US4345647 Apparatus to increase oil well flow
08/24/1982US4345480 Rotary flow meter
08/24/1982US4345454 Compensating well instrument
08/24/1982CA1130271A1 Mounting and shock absorber assembly for borehole telemetry apparatus
08/24/1982CA1130195A1 Combined piezo-meter and inclinometer casing
08/19/1982WO1982002777A1 Toroidal coupled telemetry apparatus
08/19/1982WO1982002754A1 Insulated drill collar gap sub assembly for a toroidal coupled telemetry system
08/17/1982US4344484 Determining the locus of a processing zone in an in situ oil shale retort through a well in the formation adjacent the retort
08/10/1982US4343181 Method for determining thermal conductivity and thermal capacity per unit volume of earth in situ
08/10/1982CA1129305A1 Low well yield control system and method
08/05/1982WO1982002573A1 Methods and apparatus for well investigation and development
08/04/1982EP0056872A1 Method and apparatus for surveying ground
08/03/1982US4342222 Method for the determination of depth of a fluid-saturated stratum and fluid type
08/03/1982CA1129066A1 Method and apparatus for acoustically investigating a casing and casing cement bond in borehole penetrating an earth formation
08/03/1982CA1128927A1 Drilling stabilizer
08/03/1982CA1128924A1 Pressure pulse detection apparatus incorporating noise reduction feature
08/03/1982CA1128923A1 Measuring while drilling tool
08/03/1982CA1128769A1 Stress measuring device on the coupling of a working drill string
07/1982
07/27/1982CA1128655A1 Method and apparatus for automatically inscribing magnetic marks on a wireline
07/27/1982CA1128623A1 Transmitting well logging data
07/20/1982US4339946 Hydraulic depth indicator for hydraulic drilling machines
07/20/1982CA1128187A1 Method and apparatus for demodulating signals in logging while drilling system
07/20/1982CA1127833A1 Wide angle inclinometer
07/13/1982CA1127532A1 Injectivity profile logging for two phase flow
07/13/1982CA1127531A1 Injectivity profile logging for two phase flow
07/13/1982CA1127419A1 Methods and apparatus for sensing wellhead pressure
07/13/1982CA1127414A1 Meter proving method
07/07/1982EP0055675A1 Method and apparatus for determining the stuck point of drill pipes in a borehole
07/07/1982EP0055634A1 Method of recording a physical characteristic of a borehole casing
06/1982
06/30/1982EP0055169A2 Device for the measurement of the liquid flow in a borehole
06/29/1982CA1126849A1 Method and apparatus for demodulating signals in a logging while drilling system
06/29/1982CA1126848A1 Method and apparatus for demodulating signals in a logging while drilling system
06/24/1982WO1982002074A1 Device for pressing geophysical devices against the wall of a bore hole
06/23/1982EP0054475A1 Apparatus for measuring weight-on-bit and torque
06/22/1982US4336564 Solenoid control circuit
06/22/1982US4335602 Method and apparatus for protecting subsurface electronic assemblies from shock and vibration damage
06/22/1982US4335520 Survey spar system for precision offshore seafloor surveys
06/10/1982WO1982001908A1 An acoustic system to guide a coal seam auger
06/08/1982US4334271 Well logging method and system
06/08/1982CA1125005A1 Tfl caliper
06/01/1982US4332172 Device for determining the pore water pressure in a soil
06/01/1982CA1124508A1 Borehole surveying instrument
05/1982
05/26/1982EP0052145A1 Method and device for prospecting a well during drilling
05/25/1982CA1124228A1 Systems, apparatus and methods for measuring while drilling
05/18/1982US4330153 Identification of fluid flow under in-situ mining conditions
05/11/1982US4329647 Method for determining distance and direction from an open well to a cased well using resistivity and directional survey data
05/11/1982US4328704 Apparatus for measuring the deformation and stress condition of the string of casing of drilled oil wells
05/11/1982CA1123237A1 Mapping apparatus employing two input axis gyroscopic means
05/04/1982CA1123075A1 Packoff leak detector
05/04/1982CA1123051A1 Pipe section for use in a borehole
05/04/1982CA1122814A1 Method of determining change in subsurface structure due to application of fluid pressure to the earth
04/1982
04/27/1982US4326411 Method and apparatus for monitoring fluid flow
04/20/1982CA1122114A1 Method of producing self-propping fluid-conductive fractures in rock
04/15/1982WO1982001257A1 Servo valve for well-logging telemetry
04/14/1982EP0049668A2 Method and apparatus for conducting logging or perforating operations in a borehole
04/13/1982US4324297 Steering drill string
04/06/1982US4323991 Fluidic mud pulser
04/06/1982US4322969 Gas pressure relieving hydrostatic tester
04/06/1982CA1121330A1 Shock limiting apparatus
03/1982
03/31/1982EP0048342A2 Process and apparatus to supply a pressure fluid which is pumped with a variable pressure
03/30/1982CA1121020A1 Device for the precise measurement of movements or deformations
03/24/1982EP0047878A2 Process and apparatus for measuring foundation injection pressure
03/23/1982US4320579 Calipering tool
03/16/1982US4320473 Borehole acoustic telemetry clock synchronization system
03/16/1982US4320340 Apparatus for measuring magnetic flux density resulting from galvanic current flow in subsurface casing using a plurality of flux gates
03/16/1982US4319634 Drill pipe tester valve
1 ... 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314