Patents Assigned to Halliburton Geophysical Services
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Patent number: 4953657Abstract: In seismic exploration, a survey may be conducted using multiple seismic energy sources activated substantially simultaneously. A series of shots is made at each shot point, with a determinable time delay between the activation of each source for each shot. There must be at least two different determinable time delays in each series of shots. The seismic signals are recorded. A method of processing the signals to separate signals from each source is provided. For each signal receiver, the amplitudes of the signals from each shot in the series is summed. The signals are then time shifted, so that the signals from the second source to be activated are received at the same time, and the amplitudes for the series are summed. This step is repeated for each subsequently activated source. Time domain operators are derived, the operators and the summations Fourier transformed to the frequency domain, in which the signals received from each source are readily calculated.Type: GrantFiled: February 14, 1989Date of Patent: September 4, 1990Assignee: Halliburton Geophysical Services, Inc.Inventor: Bruce L. Edington
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Patent number: 4937793Abstract: A processing method is disclosed for marine seismic surveying which utilizes two vertically spaced marine streamers each having a plurality of seismic detectors contained therein. A seismic energy source positioned at or near the surface of a body of water is utilized to generate seismic waves which propagate into earth formations below the water and reflect back up to be detected at each streamer. Seismic waves also reflect from the water/air interface back down toward the streamers and must be separated from the upgoing seismic waves to enhance the accuracy of the resultant trace. The seismic waves detected at two selected vertically displaced seismic detectors are combined to form a sum signal which is then combined with a scaled time integral of a difference signal to form a resultant signal which preserves either the upgoing or downgoing seismic waves.Type: GrantFiled: May 30, 1989Date of Patent: June 26, 1990Assignee: Halliburton Geophysical Services, Inc.Inventors: Edward L. Shuck, Joe I. Sanders, David Monk
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Patent number: 4935903Abstract: A marine seismic reflection prospecting system attenuates coherent noise through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a seismic energy source, a detector, a wavefield separator, a time-shift element, and an element for generating an output signal representative of an additive linear combination of time-aligned primary and ghost signal components. The system's output is suitable for further pre-stack processing, e.g., NMO correction.Type: GrantFiled: August 25, 1989Date of Patent: June 19, 1990Assignee: Halliburton Geophysical Services, Inc.Inventors: Joe I. Sanders, Edward L. Shuck
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Patent number: 4930113Abstract: Air wave noise caused by a vibrating baseplate on a seismic vibrator is reduced or eliminated through active cancellation of sound. In active cancellation, the detection of acceleration of the baseplate is used to form a counterpart wave which is equal in amplitude but opposite in phase; a speaker produces an opposite air wave to cancel the baseplate air wave.Type: GrantFiled: March 30, 1989Date of Patent: May 29, 1990Assignee: Halliburton Geophysical Services, Inc.Inventor: John J. Sallas
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Patent number: 4928785Abstract: The disclosure relates to a solenoid valve for an air gun which substantially increases the rate at which maximum air flow is achieved. The new valve structure includes a coil actuated plunger, which is preferably solid and formed of a magnetically permeable material and closes an annular 360 degree port opening between the valve inlet and valve outlet when in the unactuated state. This plunger position is maintained by a biasing spring which forces the forward annular sharp plunger edge against a face seal in the nose of the valve, thereby sealing the valve input port from its output port. Upon actuation of the solenoid valve coil, the plunger is moved against the bias of the spring very rapidly, thereby speedily uncovering the channel between inlet and outlet and permitting rapid 360 degree communication between the inlet and outlet to permit maximum air flow therebetween and out of the outlet port.Type: GrantFiled: December 22, 1988Date of Patent: May 29, 1990Assignee: Halliburton Geophysical Services, Inc.Inventor: Earnest R. Harrison
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Patent number: 4922473Abstract: Air wave noise caused by a vibrating baseplate on a seismic vibrator is reduced or eliminated through passive absorption of sound. In passive absorption, reduction of air wave noise is achieved by building a rigid, light-weight enclosure for the baseplate which remains isolated from the induced ground vibrations and nonresonant.Type: GrantFiled: April 4, 1989Date of Patent: May 1, 1990Assignee: Halliburton Geophysical Services, Inc.Inventors: John J. Sallas, Richard H. Luce, Michael A. Corrigan
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Patent number: 4918668Abstract: A method of reducing horizontally propagating pressure waves in marine seismic exploration improves the signal-to-noise ratio at associated receivers and reduces interference at unassociated receivers. Marine vibrators are arranged into an array with a given separation between each vibrator, so that horizontally propagating pressure waves from the vibrators which generally traverse the array are out-of-phase at most frequencies of vibration. The amplitude output from each vibrator varies with the output frequency of each vibrator to maximize the cancellation of out-of-phase pressure waves along the array. A receiver, which usually includes a plurality of hydrophones disposed in a streamer, is spaced from the marine vibrators at a distance sufficient to establish the receiver as being in the far-field. The output of each of the marine vibrators is locked in phase and frequency with a known pilot signal so that downwardly propagating pressure waves are substantially unaffected.Type: GrantFiled: January 30, 1989Date of Patent: April 17, 1990Assignee: Halliburton Geophysical Services, Inc.Inventor: John J. Sallas
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Patent number: 4858205Abstract: The present invention comprises a multi-barrel seismic source air gun module for use in a marine environment, preferably comprising a plurality of air gun barrels symmetrically disposed in a single plane about and rigidly secured to a control head containing means for actuating said barrels.Type: GrantFiled: August 24, 1988Date of Patent: August 15, 1989Assignee: Halliburton Geophysical Services, Inc.Inventor: Earnest R. Harrison
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Patent number: 4855967Abstract: The disclosure relates to a seismic vibrator having an airbag isolator, a transducer for monitoring the instantaneous air pressure within the airbags, a summer to add the pressures within each air bag and a calibrated weighting network to convert the composite pressure for display as holdown weight on a meter and for comparing the measured holdown against a preset threshold that is used to enable or disable sweep generation or operation of an inducer. The system also includes structure for comparing the measured holdown against a preset threshold that is used as a feedback signal to the lift system and for providing a signal proportional to holdown weight to the sweep generator for use as a feedback signal to modify the amplitude of the force generated by the actuator.Type: GrantFiled: December 22, 1988Date of Patent: August 8, 1989Assignee: Halliburton Geophysical Services, Inc.Inventors: John J. Sallas, Richard M. Weber, David S. Lamance
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Patent number: 4825973Abstract: The disclosure relates to a solenoid valve for an air gun which substantially increases the rate at which maximum air flow is achieved. The new valve structure includes a coil actuated plunger, which is preferably solid and formed of a magnetically permeable material and closes an annular 360 degree port opening between the valve inlet and valve outlet when in the unactuated state. This plunger position is maintained by a biasing spring which forces the forward annular sharp plunger edge against a face seal in the nose of the valve, thereby sealing the valve input port from its output port. Upon actuation of the solenoid valve coil, the plunger is moved against the bias of the spring very rapidly, thereby speedily uncovering the channel between inlet and outlet and permitting rapid 360 degree communication between the inlet and outlet to permit maximum air flow therebetween and out of the outlet port.Type: GrantFiled: August 18, 1987Date of Patent: May 2, 1989Assignee: Halliburton Geophysical Services Inc.Inventor: Earnest R. Harrison