Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1990-05-09
1991-09-17
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 27, 367 45, 367 57, 364421, 364422, G01V 140, G01V 128
Patent
active
050501305
ABSTRACT:
An apparatus (10) for providing while drilling information on a subterranean geologic formation (28) includes a drilling rig (12) and a rotary drill bit (18) attached to the drilling rig (12) for providing seismic waves as it drills in the earth (16). Geophones (20) are spaced from the rotary drill bit (18) in the earth (16) and receive indirect seismic wave paths (26) and seismic wave paths (30) reflected from the subterranean geologic formation (28) the seismic waves provided by the drill bit (18). A reference sensor (24) is located on the drilling rig (12). The seismic signals sensed by the reference sensor (24) and by the geophones (20) are cross-correlated to separate the drill bit generated signals from interference signals by combining the reference signals and the signals received by the geophones (20). The cross-correlated reference signals and the signals received by the geophones (20) are separated into a first group of the drill bit generated seismic signals travelling to the geophones (20) in direct paths and a second group of the drill bit generated seismic signals travelling to the geophones (20) in paths reflected from the subterranean geologic formation (28). The cross-correlation provides a domain where drill bit generated energy can be distinguished from interference. The two groups of the drill bit generated seismic signals can then be used to image the subsurface seismically so as to improve the chances of discovering hydrocarbons. The techniques is applicable to land operations and to drilling from an offshore platform over water.
REFERENCES:
patent: 3939461 (1976-02-01), Parvulescu
patent: 4207619 (1980-06-01), Klaveness
patent: 4223399 (1980-09-01), Haskett
patent: 4363112 (1982-12-01), Widrow
patent: 4706225 (1987-11-01), Raoult
patent: 4718048 (1988-01-01), Staran et al.
Widrow et al.; "Adaptive Signal Processing"; 1985, Prentice Hall, ISBNO-13-004029-0; pp. 200-211 and 337-339.
Marion Bruce
Rector James
Salehi Iraj A.
Widrow Bernard
Gas Research Institute
Moskowitz Nelson
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