Patents Represented by Attorney George W. Hager, Jr.

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  • Microwave electromagnetic borehole dipmeter
    Patent number: 4581584
    Abstract: A borehole logging tool includes three microwave antennas positioned from the longitudinal axis of the tool and spaced approximately equally around the axis. Microwave energy from a pulsed source is applied to the antennas during a plurality of microwave transmission periods. During a plurality of microwave reception periods, the amplitudes and the phases of the microwave energies received by the three antennas are measured for use in the determination of the dip of the formations surrounding the borehole.
    Type: Grant
    Filed: February 3, 1984
    Date of Patent: April 8, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Willett F. Baldwin
  • Method and system for gain selection
    Patent number: 4581725
    Abstract: An amplifier system repeatedly samples the voltage level of an analog signal and selects the gain to be applied to successive samplings of such signal in response to the voltage level of the sampled signals to thereby raise the amplitude of each sampled signal to a desired level.
    Type: Grant
    Filed: July 21, 1982
    Date of Patent: April 8, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Andrew J. Pilarcik, Jr.
  • Method for determining source and receiver statics in marine seismic exploration
    Patent number: 4581724
    Abstract: A method of determining source and receiver statics in a marine exploration area overlying a near surface low velocity layer employing a marine vessel for towing a seismic energy source and a marine detector cable, and an on-bottom seismic energy source and seismic detector located at an offset from the marine seismic line of exploration. The towed seismic energy source generates a seismic reflection signal for detection by the towed marine detector cable and a seismic refraction signal to be detected by the on-bottom seismic detector. The on-bottom seismic energy source generates a seismic refraction signal for detection by the towed marine detector cable.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: April 8, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Robert G. Zachariadis
  • Directional epithermal neutron detector
    Patent number: 4581532
    Abstract: A directional epithermal neutron detector for use in well logging employs a plurality of neutron counters and a neutron moderating material. A first thermal neutron shield provides a cylindrical housing for the counters and moderating material. The counters are clustered to one side of the housing and the moderating material fills the remaining portion of the housing. A second thermal neutron shield separates the counters from the moderating material.
    Type: Grant
    Filed: July 6, 1984
    Date of Patent: April 8, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Wyatt W. Givens, William R. Mills, Jr.
  • System for measuring the natural gamma radiation of surface and subsurface formations
    Patent number: 4580048
    Abstract: A natural gamma radiation measuring system includes a gamma ray detector and a multichannel analyzer for recording a full gamma-ray energy spectrum. An artificial source of gamma radiation that is temperature insensitive provides a known level of gamma radiation which is utilized by the multichannel analyzer to provide gain stabilization for the full energy spectrum output of the gamma ray detector.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: April 1, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Eric P. Dion
  • Method and system for displacing drilling fluid from a drill string in a well drilling system
    Patent number: 4577700
    Abstract: A rotary well drilling system employs a drill string with a drill bit affixed at its lower end for the drilling of a borehole. Drilling fluid is circulated through the drill string to remove drill cuttings. To break out a section of drill pipe from the drill string, the drill string is raised to a point where the drill string joint to be broken is above the drilling rig floor. Compressed gas is injected into the drill string to displace the column of drilling fluid to a level below such drill string joint. The compressed gas is vented and the drill pipe is broken out of the drill string.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: March 25, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Thomas B. Dellinger, William G. Boston, James H. Sexton, Robert T. Strong
  • Borehole logging tool utilizing electromagnetic energy in the determination of dip of subsurface formations surrounding a borehole
    Patent number: 4578645
    Abstract: An electromagnetic borehole logging tool has at least two antenna arrays positioned at spaced-apart locations along the longitudinal axis of the borehole tool. Each antenna array has at least three sub arrays spaced approximately equally around the longitudinal axis of the tool. Each sub array has at least one antenna for transmitting and receiving electromagnetic energy. The three sub arrays of the first of the two antenna arrays are respectively located at approximately the same circumferential positions around the longitudinal axis of the tool as the three sub arrays of the second of the two antenna arrays. Each of the sub arrays transmits electromagnetic energy into the formations surrounding the borehole and receives electromagnetic energy upon its return to the borehole from such formations.
    Type: Grant
    Filed: February 1, 1984
    Date of Patent: March 25, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Gustave L. Hoehn, Jr.
  • System of drilling deviated wellbores
    Patent number: 4577701
    Abstract: Directional drilling is carried out with a rotary drilling tool having a drill string, a drill bit, a drill motor for rotating the drill bit independently of the drill string, and a bent sub affixed between the lower end of the drill string and the drill motor for angularly displacing the axis of rotation of the drill bit from the axis of rotation of the drill string. Both the drill string and drill bit are rotated to provide a straight path for the wellbore, while only the drill bit is rotated during the deviation of the wellbore from a straight path.
    Type: Grant
    Filed: August 8, 1984
    Date of Patent: March 25, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Thomas B. Dellinger, Wilton Gravley
  • Method of using seismic data to monitor firefloods
    Patent number: 4577690
    Abstract: A method for identifying the location of the extent of travel of a combustion front following an in situ oil recovery operation employs a source of seismic energy and at least one seismic receiver for detecting seismic reflection signals from boundaries between subterranean formations on either side or opposite sides of such location. The properties of these seismic reflection signals are changed by the reduction in water saturation in the oil reservoir caused by the drying effect of the combustion front, and any such change is detected as an identification of the location of the extent of travel of the combustion front through the oil reservoir.
    Type: Grant
    Filed: April 18, 1984
    Date of Patent: March 25, 1986
    Assignee: Mobil Oil Corporation
    Inventor: William L. Medlin
  • Method for depth referencing hydrocarbon gas shows on mud logs
    Patent number: 4578579
    Abstract: A hydrocarbon mud log and a natural gamma-ray mud log are recorded for well drilling operations. A natural gamma-ray wireline log is run in the well following drilling operations. The natural gamma-ray mud log and natural gamma-ray wireline log are correlated to identify the correct depth interval of gas shows on the hydrocarbon mud log.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: March 25, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Eric P. Dion
  • Method for enhancing recorded marine seismic reflection signals having undulating water bottom distortions
    Patent number: 4577297
    Abstract: In marine seismic exploration, seismic energy is transmitted through a water layer into the earth and seismic reflection signals from subsurface interfaces are recorded. Any undulating water bottom distortion in the recorded reflection signals is removed by replacing the seismic energy velocity in the water layer with a velocity matching that of the earth medium below the water bottom.
    Type: Grant
    Filed: July 9, 1985
    Date of Patent: March 18, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Cynthia T. Kalkomey, Thomas J. Mason, Keh Pann
  • Method for correcting surface consistent statics in seismic traces
    Patent number: 4577298
    Abstract: Disclosed is a method for estimating and correcting source and receiver statics contained in recorded and gathered seismic traces. Measurements based on the time of arrival of reflection and refraction signal components in the recorded and gathered traces are used to produce source-receiver statics estimates, which are in turn used to correctly time shift the individual traces of the gather for subsequent common depth point (CDP) gathering and stacking.
    Type: Grant
    Filed: September 8, 1983
    Date of Patent: March 18, 1986
    Assignee: Mobil Oil Corporation
    Inventor: David Hinkley
  • Motor speed detector
    Patent number: 4575677
    Abstract: A motor speed detector employs a magnetic sensor for detecting rotational movement of rotor armature segments of the motor and for producing real tachometer pulses in response to such movement. False tachometer pulses produced by extraneous non-rotor motor components are discriminated against to produce a signal representative of actual motor rotational speed.
    Type: Grant
    Filed: May 25, 1984
    Date of Patent: March 11, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Charles L. Dennis
  • Method for distinguishing between total formation permeability and fracture permeability
    Patent number: 4575828
    Abstract: A borehole logging tool traverses a subsurface formation known to contain naturally occurring fractures. Acoustic wave energy through the naturally fractured formations is measured by a pair of spaced-apart receivers in the logging tool. The ratio of the tube wave amplitudes measured by the pair of receivers identifies total formation permeability. The differences in the tube wave travel times measured by the pair of receivers identifies matrix permeability. The difference between total formation permeability and matrix permeability is attributable to the naturally occurring fractures in the formation.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: March 11, 1986
    Assignee: Mobil Oil Corporation
    Inventor: D. Michael Williams
  • Method for drilling deviated wellbores
    Patent number: 4573540
    Abstract: Directional drilling of a high-angle wellbore is carried out by the drilling of a vertical first portion to a kick-off point at which a high-angle, deviated second portion is initiated. The wellbore is cased to at least below the kick-off point. A casing liner is lowered through the wellbore so that it extends coextensively with the casing. The liner is spaced from the casing by a casing hanger positioned above the kick-off point. The liner is sealed in the casing and prevented from rotating during drilling by a packer bore receptacle positioned between the lower end of the liner and the casing. During the drilling of the deviated second portion of the wellbore, the casing liner protects the casing from wear due to the rotation of the drill string as it lies on the lower side of the high-angle wellbore.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: March 4, 1986
    Assignee: Mobil Oil Corporation
    Inventors: Thomas B. Dellinger, Eugene A. Hoppe, Charles E. Jones
  • Method for monitoring ore grade of an uranium bearing mixture
    Patent number: 4568511
    Abstract: A method for monitoring the ore grade of an uranium bearing fluid mixture. A sample of the fluid mixture is irradiated with neutrons. Delayed fission neutrons resulting from the fission of uranium present in the sample are counted as an indication of uranium ore grade.
    Type: Grant
    Filed: March 11, 1983
    Date of Patent: February 4, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Wyatt W. Givens
  • Method and system for uranium exploration
    Patent number: 4568510
    Abstract: A portable uranium analyzer employs a neutron source and a neutron detector for carrying out an uranium assay along the surface of the earth and a gamma ray detector for carrying out a natural gamma radiation assay along the surface of the earth. The neutron source irradiates the underlying earth formation along an exploration line in either a continuous scan mode or in a plurality of fixed assay points. Prompt or delayed neutrons resulting from neutron fission of any uranium present in the formation are detected and recorded during assaying. The uranium assay and the natural gamma radiation assay are correlated to identify formations suspected of containing uranium.
    Type: Grant
    Filed: April 12, 1983
    Date of Patent: February 4, 1986
    Assignee: Mobil Oil Corporation
    Inventor: Richard L. Caldwell
  • Borehole gamma ray logging detector
    Patent number: 4568830
    Abstract: A gamma ray detector for borehole logging includes a bismuth germanate crystal having a sensitivity to gamma rays and giving off light energy proportional to the energy of detected gamma rays. The bismuth germanate crystal is mounted in a housing which allows the operating temperature of the crystal to be maintained under increasing borehole temperature with depth.
    Type: Grant
    Filed: June 22, 1983
    Date of Patent: February 4, 1986
    Assignee: Mobil Oil Corporation
    Inventors: David C. Stromswold, Wyatt W. Givens
  • Epithermal neutron lifetime logging
    Patent number: 4556793
    Abstract: A radioactive borehole logging tool employs an epithermal neutron detector having a neutron counter surrounded by an inner thermal neutron filter and an outer thermal neutron filter. Located between the inner and outer thermal neutron filters is a neutron moderating material for extending the lifetime of epithermal neutrons to enhance the counting rate of such epithermal neutrons by the neutron counter.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: December 3, 1985
    Assignee: Mobil Oil Corporation
    Inventors: Linus S. Allen, William R. Mills
  • Method for measuring seismic phase shift of compressional waveforms
    Patent number: 4554647
    Abstract: Seismic pulse waveforms are generated for travel through subsurface formations. Both normally-reflected and obliquely-reflected waveforms from subsurface interfaces are recorded. The differential phase change between the normally-reflected and obliquely-reflected waveforms are determined for each interface. The fluid characteristics of the porous subsurface layers are identified as gas-saturated or water-saturated in response to the relative amounts of phase change, a gas-saturated layer providing a larger phase change than a water-saturated phase change.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: November 19, 1985
    Assignee: Mobil Oil Corporation
    Inventor: Bijan J. Rafipour