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《Journal of Oil and Gas Technology》 2007-01
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Method for Determining Static Pressure for Horizontal Well Short-time Shut In

WANG Tao, WANG Shuang-cai (Tarim Oilfield Company, PetroChina, Korla 841000)QIAO Shu-xiao (West Branch of Sinopetroleum Technology Inc., Korla 841000)YU Zhi-nan, ZHU Yuan-qing, ZHANG Bo, BAI Qiu-yan, NIE Li-zhen, JIANG Shi-yu (Tarim Oilfield Company, PetroChina, Korla 841000)  
In consideration of the situation of no buildup test for horizontal wells because of condition restriction, it is proposed that the method of using unbalanced pressure to correct calculated formation pressure (static) during short-time shutin of maintenance. The method is theoretically reliable of easy operation, by which the bigger error induced when measured bottomhole pressure used instead of static formation pressure is avoided. It is used for data correction of horizontal wells of 2 unsaturated sandstone reservoirs in Tarim Oilfield, the accuracy of static pressure valve is obviously improved after the correction, by which reliable formation pressure data are provided for dynamic analysis of reservoirs and practical for horizontal well testing.
【CateGory Index】: TE353
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