Method of evaluating fluid loss in subsurface fracturing operati

Details Method of evaluating fluid loss in subsurface fracturing operati Method of evaluating fluid loss in subsurface fracturing operati

1990-10-26

1993-08-31

Envall, Jr., Roy N.

Boots, shoes, and leggings

364422, 73 38, 73155, G01V 100

Patent

active

052414752

ABSTRACT:
An implementation of the present invention will typically be performed through use of two test fracturing or "mini-frac" operations to determine formation parameters. A first mini-frac operation will be performed to determine the fluid efficiency of the formation, and a second mini-frac operation will be performed to determine a late time fluid leak-off coefficient. The data thus obtained will be functionally related to simultaneously solve integral expressions to determine the total volume of fluid lost during pumping and the total volume of fluid lost during shut-in in response to an assumed spurt time. The fluid loss values will then be functionally related to the established fluid efficiency to estimate an early time fluid leak-off coefficient. The early time fluid leak-off coefficient thus determined will then be applied in a balance equation to verify the accuracy of such value in response to the assumed spurt time. The assumed spurt time may then be varied and the above fluid loss values iteratively reevaluated until the balance equation is satisfied within an acceptable range of tolerance.

REFERENCES:
patent: 3933205 (1976-01-01), Kiel
patent: 4836280 (1989-06-01), Soliman
patent: 4848461 (1989-07-01), Wellington
patent: 5050674 (1991-09-01), Soliman et al.
"Recent Advances in Hydraulic Fracturing", 1989, 2 cover pages, Chapter 4 cover page, pp. 88-89, 92-93, 227, 231, and 300, by John L. Gidley, Stephen A. Holditch, Dale E. Neirode, and Ralph W. Veatch Jr.
"Determination of Fracture Parameters from Fracturing Pressure Decline," SPE 8341, published 1979, pp. 1-16, by Kenneth G. Nolte.
"Field Application of Minifrac Analysis to Improve Fracturing Treatment Design", SPE 17463, pp. 235-256, published 1988, by H. C. Tan, J. M. Mcgowen, W. S. Lee, and M. Y. Soliman.
"Reservoir Stimulation", 1987, Chapter 7, pp. 7-1-7-17, by Michael J. Economides and Kenneth G. Nolte.

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