Method and apparatus for acquiring seismic signals in a borehole

Details Method and apparatus for acquiring seismic signals in a borehole Method and apparatus for acquiring seismic signals in a borehole

1983-07-08

1986-01-07

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181104, 181105, 324367, G01V 140, G01V 318

Patent

active

045637571

ABSTRACT:
The present invention relates to the acquisition of seismic signals at different levels in a borehole, in response to the generation of seismic waves by a source placed on the surface or in the vicinity of the surface. The acquisition is carried out by means of a sonde suspended in the borehole from a cable and equipped with an anchoring pad. At each acquisition level, the pad is anchored in the borehole wall to couple the sonde to the formation, and then the pad is released from the wall once the acquisition is over. The signals acquired are then sent to the surface by means of the cable. The force with which the pad is anchored in the wall is controlled by means of a feedback arrangement which includes a sensor arranged in the pad itself. During the sonde movements from one level to another, the pad is kept in contact with the wall.

REFERENCES:
patent: 2846662 (1958-08-01), Sparks
patent: 3356146 (1967-12-01), Anderson
patent: 3423671 (1969-01-01), Vezin
patent: 3426865 (1969-02-01), Henry
patent: 3566682 (1971-03-01), Winkler, Jr.
patent: 4117394 (1978-09-01), Souhaite 325374
Lang, "Technique Expands Borehole Data," 7/9/79, Oil And Gas Journal, vol. 77 #28, pp. 139-143.

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