Petroleum Science >2018,??Issue 4:??794-800 DOI:
Impact of elliptical boreholes on in situ stress estimation from leak-off test data Open?Access
文章信息
作者：Hong Xue Han, Shunde Yin and Bernt Sigve Aadnoy
作者單位：
Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA,Department of Petroleum Engineering, University of Wyoming, Laramie, WY 82071, USA and Petroleum Engineering Department, University of Stavanger, 4036 Stavanger, Norway
投稿時間：2018-01-05
引用方式：
文章摘要
We developed an inversion technique to determine in situ stresses for elliptical boreholes of arbitrary trajectory. In this approach, borehole geometry, drilling-induced fracture information, and other available leak-off test data were used to construct a mathematical model, which was in turn applied to finding the inverse of an overdetermined system of equations. The method has been demonstrated by a case study in the Appalachian Basin, USA. The calculated horizontal stresses are in reasonable agreement with the reported regional stress study of the area, although there are no field measurement data of the studied well for direct calibration. The results also indicate that 2% of axis difference in the elliptical borehole geometry can cause a 5% difference in minimum horizontal stress calculation and a 10% difference in maximum horizontal stress calculation.
關鍵詞
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Inversion, Leak-off test data, Elliptical borehole, In situ stress