Well test imaging

Details Well test imaging Well test imaging

1993-09-17

1996-08-20

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

364422, 175 50, 16625001, G01V 140, E21B 4900

Patent

active

055485634

ABSTRACT:
A method is provided for establishing the location and orientation of the boundaries surrounding a subterranean reservoir and creating an image thereof. A conventional pressure test is performed on a well, establishing measures of the well's pressure response as defined by the rate of pressure change in the reservoir over time. Conventional techniques are used to determine measures of the radius of investigation. A calculated response for an infinite and radially extending well and the measured response are compared as a ratio. Variation of the ratio from unity is indicative of the presence of a boundary and its magnitude is related to an angle-of-view. The angle-of-view is related to the orientation of the boundary to the well. By combining the angle-of-view and the radius of investigation, one can define vectors which extend from the well to locations on the boundary, thereby defining an image of the boundary. In an alternate embodiment, the angle-of-view and radius of investigation can be applied in a converse manner to predict the pressure response of a well from a known set of boundaries.

REFERENCES:
patent: 4607524 (1986-08-01), Gringarten
patent: 4799157 (1989-01-01), Kueuk et al.
patent: 5431227 (1995-07-01), Montgomery et al.
Advances in Well Test Analysis, Robert C. Earlougher, Jr., Society of Petroleum Engineers of AIME, New York 1977 Dallas, Chapter 2, pp. 4-8 and 18-20; Chapter 3, pp. 22-23; Chapter 6, pp. 45-49; Appendix E, pp. 242-245.
Larsen, L. , Norwegian Inst. Technol. et al N Sea Oil & Gas Reservoirs Seminar, Dec. 2, 1985, pp. 257-268. Abst. only.
Ehlig-Economides, C., J. Pefr. Technol., vol. 40, #10, pp. 1280-1282, Oct. 1988; abst. only herewith.
Larsen, L., 58th Anmu. SPB of AIMB Tech Conf. Oct. 5, 1983, SPE-12135, 15 PP; abst. only herewith.

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