Method for determining fracture closure pressure and fracture vo

Details Method for determining fracture closure pressure and fracture vo Method for determining fracture closure pressure and fracture vo

1990-10-09

1991-09-24

Suchfield, George A.

Wells

Processes

With indicating, testing, measuring or locating

166308, 73155, E21B 4706, E21B 4326

Patent

active

050506749

ABSTRACT:
In one aspect of the present invention, a method is provided for determining the fracture closure pressure of a fractured formation. The method includes the steps of injecting a fracturing fluid into a subsurface formation to create a fracture, measuring the pressure response of the formation after injection has ceased, and determining the pressure at the onset of constant volume behavior as the fracture closure pressure. In another embodiment of the present invention, the fracture volume, leak-off volume and efficiency are determined by integrating the fracture closure rate over time, and then iterating with a fluid volume equation. Still another embodiment of the present invention determines the fracture volume, leak-off volume and efficiency by extrapolating the apparent system volume back to the moment when injection is stopped.

REFERENCES:
patent: 4372380 (1983-02-01), Smith et al.
patent: 4660415 (1987-04-01), Bouteca
patent: 4836280 (1989-06-01), Soliman
patent: 4848461 (1989-07-01), Lee
"Microfrac Tests Optimize Frac Jobs" Oil & Gas Journal, pp. 45-49 (Jan. 22, 1990) Kuhlman.
SPE 8341 . . . Determination of Fracture Parameters from Fracturing Pressure Decline . . . Nolte, Sep. 1979.
SPE 15370 . . . Technique for Considering Fluid Compressibility and Temperature Changes in Mini-Frac Analysis . . . Soliman, Oct. 1986.
SPE 13872 . . . Pressure Decline Analysis with the Christianovich and Zheltov and Penny-Shaped Geometry Model of Fracturing . . . Lee, May 1985.

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