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《Natural Gas Industry》 2006-04
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PHASE BEHAVIORS AND PERCOLATION CHARACTERISTICS OF LEAN CONDENSATE GAS SYSTEM WITH WATER VAPOR

Xiong Yu1, Zhang Liehui1, Shi Yunqing2, Chen Qingdong3 (1 State Key Laboratory of Reservoir Geology and Development Engineering, Southwest Petroleum Institute; 2 Zhongyuan Oilfield Company, Sinopec; 3 PetroChina Changqing Oil Branch Company)  
The influences of water vapor are commonly neglected in conventional phase analysis of condensate gas system, but the impacts of water vapor on production of condensate gas well actually are not negligible. Phase behaviors of lean condensate gas systems with and without water vapor are compared through experiments. It is found that the existence of water vapor can greatly change the phase behaviors and that the condensate drop-out interval doesn't coincide with the result of conventional phase behaviors analysis and there is a big discrepancy. Water membrane theory is proposed for analyzing the influences of condensate water on percolation of oil and gas during development of low-permeability condensate gas reservoirs and a mathematical model is built. A case study of the influences of condensate gas on relative permeability curves shows that the drop-out of condensate water can change the percolation characteristics of condensate oil and gas, result in migration of relative permeability curves and speed up accumulation of condensate oil saturation in near-wellbore area. It is concluded that the occurrence of water vapor in condensate gas can speed up condensation of heavy hydrocarbons and alter the retrograde condensation interval of condensate gas, and that the condensate water resulted from water vapor in the process of percolation can speed up accumulation of condensate oil saturation in near-wellbore area and greatly reduce the deliverability of low-permeability condensate gas well.
【Fund】: 高等学校优秀青年教师教学科研奖励计划;; 四川省学术和技术带头人基金;; 西南石油大学基金(y99-160)资助。
【CateGory Index】: TE312
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