Fast Pressure Decline Analysis of Fracture Calibration Tests

doi:10.11885/j.issn.1674-5086.2014.02.14.01

Abstract

Abstract:

Abstract：Due to the lack of simple and effective pressure decline analysis methods of fracture calibration tests，the pressure
decline behavior of a fracture calibration test was investigated. The numerical simulation results show that four flow regimes
of the fracturing fluid in formation and fractures，i.e. fracture extension，fracture elastic closure，after-closure linear and radial
flow，can be identified. Its differential pressure derivative plot successively shows 1/2 slope，3/2 slope，1/2 slope and 0 slope
lines on the log-log coordinate. Further，a fast method which can firstly diagnose the downhole pressure monitoring data in
log-log plot was proposed. Then the key parameters of the fracture reservoir will be gotten with the analysis of G function，
FL function and FR function，respectively，such as the initial reservoir pressure，closure pressure，formation factor，leakoff
coefficient of fracturing fluid etc. The proposed method was applied to a field case in East Sea，China. The results proved that
the method is reliable and practical in field application.

Key words: Key words：fracture calibration test, pressure decline, log-log plot, fracture closure, after-closure period

Wang Fei, Zhang Shicheng, Cai Jiujie. Fast Pressure Decline Analysis of Fracture Calibration Tests[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.02.14.01.

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