Signal processing to enable utilization of a rig reference senso

Details Signal processing to enable utilization of a rig reference senso Signal processing to enable utilization of a rig reference senso

1991-09-13

1993-03-02

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 43, 367 57, 364421, G01V 140, G01V 128

Patent

active

051915570

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 in direct 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 techinque is applicable to land operations and to drilling from an offshore platform over water.

REFERENCES:
patent: 3939461 (1976-02-01), Parvulescu
patent: 4040003 (1977-08-01), Beynet et al.
patent: 4207619 (1980-06-01), Klaveness
patent: 4223399 (1980-09-01), Hackett
patent: 4363112 (1982-12-01), Widrow
patent: 4706225 (1987-11-01), Raoult
patent: 4718048 (1988-01-01), Staron et al.
patent: 4800541 (1989-01-01), Farmer et al.
Widrow et al.; "Adaptive Signal Processing"; 1985, Prentice Hall, ISBWO-13-004029-0; pp. 200-211 and 337-339.

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