高速非达西渗流对裂缝参数设计的影响研究
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摘要
当压裂气井裂缝内的气体流动速率较大时,天然气在裂缝中符合高速非达西渗流规律,渗流阻力显著增大,气井产量明显降低。此文修正了高速非达西渗流时裂缝有效渗透率的计算公式,并结合基于支撑剂数法的压裂设计方法,得出了高速气井非达西渗流的裂缝参数设计方法,给出了裂缝参数设计的步骤。通过实例计算得出,天然气在裂缝中为高速非达西渗流时,裂缝有效渗透率大幅度减小;当压裂所用的支撑剂质量一定时,设计所得的最优裂缝缝长明显缩短,最优裂缝缝宽明显增加。
The nature gas follows non-Darcy flow rules when the flow rate at fracture is relatively large,with the flow resistance increasing significantly,which causes gas well production obvious decrease. The formula of fracture effective permeability is amended;fracture parameters design method is built based on proppant number,which is suitable for gas well in the presence of non-Darcy flow of high flow rate; the fracture parameters design procedure is also developed. The calculation example shows that fracture effective permeability is much smaller under high flow rate non-Darcy flow condition,that the optimum fracture length will shorten obviously and that optimum fracture width will increase gradually when the sum of proppant is a constant.
The nature gas follows non-Darcy flow rules when the flow rate at fracture is relatively large,with the flow resistance increasing significantly,which causes gas well production obvious decrease. The formula of fracture effective permeability is amended;fracture parameters design method is built based on proppant number,which is suitable for gas well in the presence of non-Darcy flow of high flow rate; the fracture parameters design procedure is also developed. The calculation example shows that fracture effective permeability is much smaller under high flow rate non-Darcy flow condition,that the optimum fracture length will shorten obviously and that optimum fracture width will increase gradually when the sum of proppant is a constant.
引文
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[6]黄亮.低渗油藏注水井达西-非达西耦合试井模型及压力分析[J].油气井测试,2017(4):12-15.
[7]马新仿,Peter Valko.裂缝非达西渗流对气井水力压裂设计的影响[J].油气地质与采收率,2010(5):83-85.
[8]HOANG L T,KIEU T T,PHAN T V.Properties of Generalized Forchheimer Flows in Porous Media[J].Journal of Mathematical Sciences,2014(202):259-332.
[9]RICHARDSON M.A New and Practical Method for Fracture Design and Optimization[C]∥SPE.Gas Technology Symposium,2000:118-125.
[10]ECONOMIDES M J,OLIGNEY R E,VALKO P.Applying unified fracture design to natural gas wells[J].World Oil,2002(10):50-62.
[11]郭建春,梁豪,赵志红.基于最优支撑剂指数法优化低渗气藏裂缝参数[J].西南石油大学学报,2013(1):93-98.
[2]ECONOMIDES M J,OLIGNEY R E,VALKO P.Unified Fracture Design[M].Texas:Orsa Press,2002.
[3]梅海燕,毛恒博,唐雯,等.低渗气藏气水两相非达西渗流及产能影响因素分析[J].科学技术与工程,2017(13):154-158.
[4]GUO J J,WANG H T,ZHANG L H.Transient pressure and production dynamics of multi-stage fractured horizontal wells in shale gas reservoirs with stimulated reservoir[J].Journal of Natural Gas Science and Engineering,2016,35:425-443.
[5]姜瑞忠,滕文超,乔欣,等.复合页岩气藏压裂水平井压力动态分析[J].天然气地球科学,2015(12):2336-2342.
[6]黄亮.低渗油藏注水井达西-非达西耦合试井模型及压力分析[J].油气井测试,2017(4):12-15.
[7]马新仿,Peter Valko.裂缝非达西渗流对气井水力压裂设计的影响[J].油气地质与采收率,2010(5):83-85.
[8]HOANG L T,KIEU T T,PHAN T V.Properties of Generalized Forchheimer Flows in Porous Media[J].Journal of Mathematical Sciences,2014(202):259-332.
[9]RICHARDSON M.A New and Practical Method for Fracture Design and Optimization[C]∥SPE.Gas Technology Symposium,2000:118-125.
[10]ECONOMIDES M J,OLIGNEY R E,VALKO P.Applying unified fracture design to natural gas wells[J].World Oil,2002(10):50-62.
[11]郭建春,梁豪,赵志红.基于最优支撑剂指数法优化低渗气藏裂缝参数[J].西南石油大学学报,2013(1):93-98.