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)
08/1983
08/09/1983CA1151533A1 Drill pipe tester and safety valve
08/09/1983CA1151476A1 Rapid release erosion probe
08/02/1983US4396838 Logging type subsidence detector
08/02/1983US4396071 Mud by-pass regulator apparatus for measurement while drilling system
07/1983
07/26/1983CA1150856A1 Measurement of flowing water salinity within or behind wellbore casing
07/26/1983CA1150716A2 Systems, apparatus and methods for measuring while drilling
07/19/1983US4393598 Borehole tool
07/13/1983EP0083366A1 Moving mass pump jack and method of operation
07/12/1983US4393485 Apparatus for compiling and monitoring subterranean well-test data
07/12/1983US4392782 Liquid level controller
07/12/1983US4392529 Method of cleaning a well and apparatus thereof
07/12/1983US4392377 Early gas detection system for a drill stem test
07/12/1983US4392376 Method and apparatus for monitoring borehole conditions
07/06/1983EP0083279A1 Method and apparatus for acoustically measuring the transverse dimensions of a borehole
07/05/1983US4391336 Acoustic system to guide a coal seam auger
07/05/1983US4391329 Use of marker fluid in cementing offshore wells
07/05/1983US4391135 Automatic liquid level monitor
06/1983
06/29/1983EP0082772A1 Device for measuring the internal dimensions of a tube, particularly in a well
06/28/1983US4390975 Data transmission in a drill string
06/28/1983US4390973 Method for determining the extent of subsurface reaction involving acoustic signals
06/28/1983US4390878 Two receiver noise loggers
06/28/1983US4390321 Control apparatus and method for an oil-well pump assembly
06/28/1983US4389885 Signal generator for a penetration rate measuring apparatus
06/28/1983US4389880 Rapidly erodible sonde
06/07/1983US4387372 Point gap assembly for a toroidal coupled telemetry system
06/07/1983US4386664 Method for guiding rotary drill
06/07/1983US4386531 Method and apparatus for determining the injection pressure during injection operations during construction work
06/07/1983CA1147841A1 Method and device for in situ detection of a mineral deposit fluid within a borehole
06/07/1983CA1147840A2 Method and apparatus for demodulating signals in a logging while drilling system
06/01/1983EP0080224A2 Means for generating electric energy in a borehole during drilling thereof
06/01/1983EP0080218A2 Method and means for transmitting data through a drill string in a borehole
05/1983
05/31/1983US4386422 Servo valve for well-logging telemetry
05/31/1983US4385449 Method and apparatus for measuring tilt and relative bearing
05/24/1983US4384483 Preventing buckling in drill string
05/18/1983EP0078907A2 Pump noise filtering apparatus for a borehole measurement while drilling system utilizing drilling fluid pressure sensing
05/18/1983EP0078906A2 Pump noise filtering apparatus for a borehole measurement while drilling system utilizing drilling fluid pressure sensing and drilling fluid velocity sensing
05/17/1983US4383436 Pipe tester
05/10/1983US4382381 Determining stresses and length changes in well production tubing
05/10/1983US4382335 Head assembly for multiposition borehole extensometer
05/03/1983US4382290 Apparatus for acoustically investigating a borehole
05/03/1983US4381667 Measurement of borehole temperature
05/03/1983US4381610 Self-contained downhole compass
05/03/1983CA1145585A1 Tracing flow of fluids
05/03/1983CA1145538A1 System and method for monitoring drill string characteristics during drilling
04/1983
04/26/1983USRE31222 Microprocessor computerized pressure/temperature/time .[.down-hole.]. recorder
04/26/1983CA1145447A1 Riser angle positioning system and process
04/26/1983CA1145446A1 Electrical connector for borehole telemetry apparatus
04/19/1983US4380264 Survey tool string
04/14/1983WO1983001336A1 Well logging apparatus and method for making same
04/12/1983US4379493 Method and apparatus for preventing wireline kinking in a directional drilling system
04/12/1983CA1144619A1 Push drill guidance indication apparatus
04/06/1983EP0075997A2 Well logging device
03/1983
03/31/1983WO1983001087A1 Apparatus for well logging while drilling
03/29/1983US4378051 Driving device for displacing an element in a conduit filled with liquid
03/29/1983CA1143823A1 Drilling orientation tool
03/29/1983CA1143790A1 Digital mineral logging system
03/22/1983CA1143399A1 Pressure seal for pumping instruments through drill rod
03/22/1983CA1143365A1 Continuous borehole-logging method
03/16/1983EP0074317A2 Logging method and apparatus using a probe equipped with measuring pads
03/15/1983CA1142749A1 Calipering tool
03/09/1983EP0073335A1 Method and apparatus for combined cement bond and acoustic well logging
03/03/1983WO1983000743A1 Method and apparatus for measuring injection or production flow profiles for viscous fluids
03/01/1983US4375239 Acoustic subsea test tree and method
03/01/1983US4375164 Formation tester
03/01/1983CA1141948A1 Apparatus for making multiple orientation measurements in a drill string
02/1983
02/22/1983CA1141533A1 Calipering tool
02/15/1983USRE31148 Sub-sea equipment test and isolation tool
02/15/1983US4373583 Test-system
02/15/1983US4373380 Test tool for sub-sea well head housings and method of testing
02/08/1983US4372398 Method of determining the location of a deep-well casing by magnetic field sensing
02/08/1983US4372380 Method for determination of fracture closure pressure
02/01/1983US4371958 Drilling orientation tool
02/01/1983US4370886 In situ measurement of gas content in formation fluid
02/01/1983US4370814 Well tool for detecting well bore deviation in drill string
01/1983
01/25/1983US4369842 Analyzing oil shale retort off-gas for carbon dioxide to determine the combustion zone temperature
01/20/1983WO1983000203A1 Moving mass pump jack and method of operation
01/12/1983EP0069530A2 Mud by-pass regulator apparatus for measurement while drilling system
01/11/1983USRE31122 Method for ascertaining optimum location for well stimulation and/or perforation
01/11/1983US4367651 Pressure transducer body
01/04/1983US4366714 Pressure/temperature probe
12/1982
12/28/1982US4365507 Method of determining the depth of occurrence of a chemically aggressive bed
12/28/1982US4365506 Remotely operated downhole test disconnect switching apparatus
12/21/1982US4365197 Identification of pipe material in wells
12/21/1982CA1138129A1 Borehole logging tool cryostat
12/21/1982CA1138128A1 Borehole logging tool cryostat
12/21/1982CA1138127A1 Borehole logging tool cryostat
12/21/1982CA1137783A1 Method and apparatus for monitoring the position and movement progress of the flame front in an underground combustion operation
12/21/1982CA1137745A1 Measuring instrument for the profile of piled charge of a blast furnace
12/14/1982US4363605 Apparatus for generating an electrical signal which is proportional to the tension in a bridle
12/14/1982US4363173 Bolt hole locating and marking tool
12/14/1982CA1137299A1 Drill hole survey instrument
12/07/1982US4362054 Method and apparatus for determining direction parameters of a continuously explored borehole
12/07/1982US4361961 Device for measuring the angular orientation of horizontal bores
11/1982
11/30/1982US4361192 Borehole survey method and apparatus for drilling substantially horizontal boreholes
11/24/1982EP0064978A1 An acoustic system to guide a coal seam auger
11/23/1982US4359900 Apparatus for mounting a sensing device in a well logging instrument
11/23/1982US4359899 Weight on drill bit measuring apparatus
11/23/1982US4359898 Weight-on-bit and torque measuring apparatus
11/23/1982CA1136035A1 Well test systems and methods
11/09/1982USRE31074 Well surveying instrument and method
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