Well test imaging

Details Well test imaging Well test imaging

1996-08-13

1998-07-28

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

364422, 175 50, 166113, 166250, G01V 140, F21B 4900

Patent

active

057870500

ABSTRACT:
An improved method is provided for establishing the location and orientation of the boundaries surrounding a reservoir and creating an image thereof. A conventional well test is performed on a well, establishing measures of the well's pressure response as a function of the rate of pressure change in the reservoir over time. Conventional techniques may be used to determine measures of the radius of investigation. A plurality of radii of investigation are determined as a function of time. A calculated response for an infinite and radially extending well are the measured response are compared as a ratio. Variation of the ratio from unity is indicative of the presence of a boundary at that radius of investigation and the magnitude of its effect related to an angle-of-view. Each radius of investigation is deemed analogous to a ring. Reservoir encompassed by this ring is in communication with the well. This ring is interrupted along its circumference by an encounter with a boundary or boundaries, the arc length of such an interruption being equal to the angle-of-view. The remaining arc of the ring is rotated so that at least one of the arc's end-points coincides, or is fitted, with a known geologic feature. Should the same ring arc intersect another feature, the ring arc is cut to form a new arc end-point. The remaining arc is rotated so that its new end-point again coincides with a geologic feature. Once all the ring arcs for each radius of investigation are fitted, their collective end-points form an image of the periphery of the reservoir.

REFERENCES:
patent: 4607524 (1986-08-01), Grengaster
patent: 4799157 (1989-01-01), Kueuli et al.
patent: 5431227 (1995-07-01), Montgomery
Ehhg-Economides, J. Petrol. Tech., vol. 40, #10, pp. 1280-1282, Oct. 1988.
Earlougher. Robert C., Jr. "Advances in Well Test Analysis", Soc. of Pet. Eng. of AIME, 1977, Dallas, Ch. 2, pp. 4-8, Ch. 3, pp. 22-23 Ch. 6, pp. 45-49 Appendix E. pp. 242-245.
Larsen, L., Seal Oil Gas Reservoir Sem., Dec. 2, 1985, pp. 257-268.
Larsen. L., 58th Ann. SPE of AIME, Oct. 5, 1983, Abstract only.

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