致密油藏压裂水平缝不稳态压力分析
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摘要
基于有限导流水平裂缝及势叠加理论,在水平裂缝壁面上进行耦合,得到不稳态压力分析模型。研究了流压变化规律,并将流动阶段划分为:裂缝内径向流动、油藏内线性流动、油藏内早期拟径向流动和油藏内晚期径向流动4个阶段;研究了不同因素对压力传播的影响,研究表明:随着油层厚度增加,油藏内垂向线性流动阶段持续时间延长,油藏内早期拟径向流动阶段出现推迟且时间延长;随着裂缝导流能力增加,裂缝内径向流动阶段时间缩短,油藏内垂向线性流动阶段持续时间延长;随着水垂比增加,油藏内垂向线性流动阶段和油藏内早期拟径向流动阶段持续时间都缩短,流动更快地进入晚期径向流动阶段。
Based on the finite conductivity horizontal crack and potential superposition theory,the coupled model is obtained on the wall surface of the horizontal crack.Flow pressure is studied,and the mobile phase is divided into four stages:Cracks in radial flow,linear flow in reservoir,reservoir in early pseudo radial flow and reservoir in the late radial flow.The effects of different factors on the pressure propagation are studied,which shows that with the increase of the thickness of oil reservoir,vertical linear flow duration,reservoir in early stage and quasi radial flow are delayed.With the increase of fracture flow capacity,crack radial flow stage time,reservoir vertical linear flow stage duration are prolonged.With the water vertical ratio increases,the vertical flow in the reservoir and reservoir in the early stage of linear pseudo radial flow duration are shortened,and flow more quickly into the late stage of radial flow.
Based on the finite conductivity horizontal crack and potential superposition theory,the coupled model is obtained on the wall surface of the horizontal crack.Flow pressure is studied,and the mobile phase is divided into four stages:Cracks in radial flow,linear flow in reservoir,reservoir in early pseudo radial flow and reservoir in the late radial flow.The effects of different factors on the pressure propagation are studied,which shows that with the increase of the thickness of oil reservoir,vertical linear flow duration,reservoir in early stage and quasi radial flow are delayed.With the increase of fracture flow capacity,crack radial flow stage time,reservoir vertical linear flow stage duration are prolonged.With the water vertical ratio increases,the vertical flow in the reservoir and reservoir in the early stage of linear pseudo radial flow duration are shortened,and flow more quickly into the late stage of radial flow.
引文
[1]刘波涛,李清泉,张福祥,等.致密油藏多级压裂水平裂缝井不稳态产能分析[J].石油与天然气地质,2014,35(1):138-142.
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[19]任岚,赵金洲,胡永全,等.水平裂缝井压后产量影响因素分析[J].西南石油大学学报(自然科学版),2010,32(4):77-81.
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[22]Gringarten A C,Ramey H J.The use of source and greens function in solving unsteady-flow problems in reservoirs[J].SPE Journal,1973,13(5):285-296.
[2]张德良,张烈辉,赵玉龙,等.低渗透气藏多级压裂水平井稳态产能模型[J].油气地质与采收率,2013,20(3):107-110.
[3]李琴,陈程,荀小全.低渗致密气藏压裂水平井产能预测新方法[J].天然气地球科学,2013,24(3):633-638.
[4]张小涛,吴建发,冯曦.页岩气藏水平井分段压裂渗流特征数值模拟[J].天然气工业,2013,33(3):47-52.
[5]熊健,王小军,吕雷.低渗油藏不对称垂直裂缝井产能模型[J].科技导报,2013,31(22):40-43.
[6]李勇明,李亚洲,赵金洲,等.垂直裂缝气井不稳定产能预测新模型[J].石油钻采工艺,2013,35(2):63-66,70.
[7]何逸凡,廖新维,徐梦雅,等.低渗透气藏压裂水平井产能预测模型及其应用[J].油气地质与采收率,2012,19(4):93-96.
[8]徐梦雅,廖新维,何逸凡,等.完井方式对致密气藏压裂水平井产能的影响[J].油气地质与采收率,2012,19(2):67-71.
[9]岳建伟,段永刚,青绍学,等.含多条裂缝的水平压裂气井产能研究[J].天然气工业,2004,24(10):102-104.
[10]Penmatcha V R.Modeling of horizontal wells with pressure drop in the well[D].Palo Alto:Stanford University,1997.
[11]廉培庆,同登科,程林松,等.垂直压裂水平井非稳态条件下的产能分析[J].中国石油大学学报(自然科学版),2009,33(4):98-102.
[12]贾培锋,杨正明,肖前华,等.致密油藏储层综合评价新方法[J].特种油气藏,2015,22(4):33-36.
[13]丁一萍,王晓冬,邢静.一种压裂水平井产能计算方法[J].特种油气藏,2008,15(2):64-68.
[14]Hemanta M,Michael J.A parametric comparison of horizontal well and vertical well performance[J].SPE Formation Evaluation,1991,6(2):209-216.
[15]Soliman M Y.Fracturing aspects of horizontal wells[J].Journal of Petroleum Technology,1990,42(8):966-973.
[16]衣同春.考虑地层污染时水平裂缝压裂产率比的计算[J].石油学报,1988,9(2):77-83.
[17]王鸿勋.水力压裂原理[M].北京:石油工业出版社,1987.
[18]胥元刚,张琪.变裂缝导流能力下水力压裂整体优化设计方法[J].大庆石油地质与开发,2000,19(2):40-42.
[19]任岚,赵金洲,胡永全,等.水平裂缝井压后产量影响因素分析[J].西南石油大学学报(自然科学版),2010,32(4):77-81.
[20]Dinh A V,Tiab D.Transient-pressure analysis of a well with an inclined hydraulic fracture using Tiab’s direct synthesis technique[R].SPE,120545,2009.
[21]Cinco L H,Samaniego V F,Dominguez A N.Transient pressure behavior for a well with a finite-conductivity vertical fracture[C].SPE 6014,1978.
[22]Gringarten A C,Ramey H J.The use of source and greens function in solving unsteady-flow problems in reservoirs[J].SPE Journal,1973,13(5):285-296.