A method for calculating ground stress based on full-process formation drain test of directional well

By conducting a full-process formation leakage test on directional wells, recording and analyzing the test data, and calculating the in-situ stress, the problem of large errors in in-situ stress calculation in traditional methods was solved, and more accurate in-situ stress calculation was achieved.

CN117709043BActive Publication Date: 2026-05-08SINOPEK PETROLEUM IZHINIRING TECH SERVIS KO LTD +1
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Patent Information

Application Number
CN202211085949.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-06
Publication Date
2026-05-08
Estimated Expiration
2042-09-06

AI Technical Summary

Technical Problem

Traditional methods for calculating geostress are based on geophysical well logging interpretations, which have significant errors, especially in the calculation of intermediate geostress. Existing methods generally have large errors.

Method used

By conducting a full-process formation leakage test on the target directional well, recording test data, and calculating leakage pressure, formation fracturing pressure, fracture extension pressure, and fracture closure pressure, and by analyzing the wellbore stress distribution and rock mechanical characteristic parameters, a geostress query chart is drawn to accurately calculate the minimum horizontal geostress, the maximum horizontal geostress, and the geostress of the overlying strata.

Benefits of technology

It improves the accuracy of geostress calculation, can truly reflect the condition of the formation rock, and is more direct and reliable than well logging data interpretation.

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Abstract

The application provides a method for calculating the ground stress based on the whole process formation leak-off test of a directional well, comprising the following steps: performing the whole process formation leak-off test on the target directional well and recording the test data; calculating the horizontal minimum ground stress and the overburden pressure according to the test data of the whole process formation leak-off test and the rock mechanics characteristic parameters of the target directional well; calculating the fracture pressure value under all possible arrangement combinations of the horizontal maximum ground stress and the horizontal minimum ground stress at the well deviation azimuth of the target directional well according to the stress distribution around the well section of the formation leak-off test well and the tensile failure criterion; drawing the contour map of the fracture pressure to establish the ground stress query chart of the target directional well; and querying the horizontal maximum ground stress corresponding to the calculated horizontal minimum ground stress in the ground stress query chart. The application calculates the ground stress based on the test data of the whole process formation leak-off test of the target directional well, and effectively improves the accuracy of the calculation result of the ground stress size.
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