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Influence of the earth stress on the Development of Gas Reservoirs

Petroleum Science 2004年第4期1卷 6-10,35页

作者：李治平宋艳波袁士义胡永乐中国地质大学能源学院中国北京100083 石油勘探开发研究院中国北京100083

Gas reservoirs are located kilometers deep beneath the earth's surface under great earth stresses, including the overburden stress and the horizontal stress. After a well is drilled, the stress condition around the well bore will be changed. During the development, a pressure funnel forms around the hole, with the rock stress redistributed. In this paper, the influence of the earth stress on the gas reservoir development, including the output, the period of the steady output, the recovery and ratio, is researched thoroughly with the theory of reservoir seepage dynamics and clarified with the calculation method. The research shows that the earth stress produces impacts on the development of a gas reservoir when the stress is great.

关键词： earth stress gas reservoir development

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Measurement and study of the distributing law of in-situ stresses in rock mass at great depth

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Journal of University of Science and Technology Beijing 2006年第3期13卷 207-212页

作者： Zhuoying Tan Meifeng Cai State Key Laboratory for High-Efficient Mining and Safety of Metal Mines Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

To solve the technical cruxes of the conventional system in deep rock mass, an automatic testing system for hydraulic fracturing that includes a single tube for hydraulic loop, a pressure-relief valve, central-tubeless packers, and a multichannel real-time data acquisition system was used for in-situ stresses measurement at great depths （over 1000 m） in a coalfield in Juye of Northern China. The values and orientations of horizontal principal stresses were determined by the new system. The virgin stress field and its distributing law were decided by the linear regression from the logged 37 points in seven boreholes. Besides, the typical boreholes arranged in both the adjacent zone and far away zone of the faults were analyzed, respectively. The results show that a stress concentration phenomenon and a deflection in the orientation of the maximal horizontal stress exist in the adjacent zone of the faults, which further provides theoretical basis for design and optimization of mining.

关键词： rock mass at great depth earth stress hydraulic fracturing in-situ stress distribution

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