Abstract:
Geo mechanical data such as in-situ stresses and rock strengths are important in a wide range of applications in the oilfield including borehole stability, well stimulation and caprock strength. Stress measurements are of particular importance in designing hydraulic fracturing jobs, an application that has grown significantly in Pakistan in the last two years. Reservoir stress magnitudes are generally estimated from openhole log measurements such as sonic logs or also from core analysis. These are empirical measurements which must be improved by comparing with a more reliable, direct measurement of stress. A technique of directly measuring the in-situ rock stresses and rock tensile strengths is by using a wireline conveyed formation tester (WFT). This test, with proper planning, can be done at any time during a well life but is usually done at the initial stages of a well, in the openhole after logs have been acquired. A micro-fracturing stress test was applied in sandstone formation in the Potwar region of Pakistan. This is the first stress test to be performed in Pakistan with a WFT, and it yielded estimates of formation stress which were used to design a hydraulic fracturing job. This paper presents the application of micro-formation testing in sandstone formation in the Potwar region of Pakistan.
Page(s):
197-209
DOI:
DOI not available
Published:
Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: 0, Year: 2007