裂缝性油藏广义Vogel方程的建立及压敏效应分析
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摘要
针对列宾逊函数仅考虑单相渗流,且现有研究只适用于欠饱和油藏及稳态渗流情形的缺陷,拓展了列宾逊函数的定义,并利用流度函数的推广式推导了裂缝性油藏在溶解气驱状态下的广义Vogel方程,其基本形式与Wiggins解析式类似。采用广义流入动态关系研究了不同变形系数下污染程度及油藏压力的压敏变化规律。结果表明,超完善井及高油藏压力状态下的完善井压力敏感性最强,控制合理的压力水平是防止溶解气驱阶段产能急剧下降的关键。
With respect to the deficiency that Lbinson function is only fit for single phase flow and the research existed is only suitable for time invariant seepage in undersaturated reservoir,the definition of Lbinson function was widened,and a universal Vogel Equation was deduced for dissolved gas drive in the fractured reservoir by using extension of mobility function.The form of the universal IPR is similar to Wiggins's analyses. Sensitivity of formation pressure and damage degree was researched by universal IPR when stress of formation was changed.Results show that the improved wells and wells in high formation pressure are most sensitive to stress change.It is very important that controlling a reasonable pressure level to avoid reducing production greatly when depletion drives.
With respect to the deficiency that Lbinson function is only fit for single phase flow and the research existed is only suitable for time invariant seepage in undersaturated reservoir,the definition of Lbinson function was widened,and a universal Vogel Equation was deduced for dissolved gas drive in the fractured reservoir by using extension of mobility function.The form of the universal IPR is similar to Wiggins's analyses. Sensitivity of formation pressure and damage degree was researched by universal IPR when stress of formation was changed.Results show that the improved wells and wells in high formation pressure are most sensitive to stress change.It is very important that controlling a reasonable pressure level to avoid reducing production greatly when depletion drives.
引文
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[3]陈胜男,赵东伟,张琪,等.裂缝性油藏流入动态模型研究[J].石油大学学报:自然科学版,2004,28(2):52-54.
[4]Guo B,Schechter D S.An integrated study of imbibition waterflooding in the naturally fractured Spraberry trend area reservoirs [C].SPE Permian Basin Oil and Gas Recovery Conference,1998.
[5]郝明强,刘先贵,胡永乐.微裂缝性特低渗透油藏单相流体渗流特征[J].油气地质与采收率,2007,14(6):79-81.
[6]黄冬梅,杨正明,郝明强,等.微裂缝性特低渗透油藏产量递减方程及其应用[J].油气地质与采收率,2008,15(1):90-91.
[7]王建华,李迎九,陈栗,等.微地震波监测技术在水驱前缘与裂缝研究中的应用[J].油气地质与采收率,2008,15(3):56- 58.
[8]付美龙,罗跃,何建华,等.聚丙烯酰胺凝胶在裂缝孔隙双重介质中的封堵性能[J].油气地质与采收率,2008,15(3):70- 72.
[9]刘北羿.压裂防砂技术进展及存在问题[J].油气地质与采收率,2008,15(4):105-107.
[10]柏松章,唐飞.裂缝性潜山基岩油藏开发模式[M].北京:石油工业出版社,1997.
[11]高文君,尹永光,胡仁权.油井流入动态方程理论研究及应用[J].新疆石油地质,2005,26(1):87-89.
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