【摘要】 通常情况下,水力压裂的裂缝缝长需根据储集层物性与产能要求进行设计,渗透率低的产层裂缝应长一些,渗透率高的产层裂缝应短一些,但对于河流相沉积地层,还需要考虑沉积作用对水力压裂裂缝缝长的控制作用。鄂尔多斯盆地大牛地气田石盒子组属于河流相沉积,河道走向与水力裂缝延伸方向呈垂直关系,在压裂过程中通过微地震监测、压裂效果分析、压力恢复试井解释、压裂压力拟合等手段,从不同角度验证了河道砂体宽度对压裂裂缝缝长的限制,证实了沉积作用对水力压裂裂缝缝长的影响。基于对河流相砂体宽度特征与裂缝横向延伸机理的研究,优化盒3段的裂缝半长为90~120 m,盒2段、盒1段裂缝半长为150~200 m。图4表5参15更多还原

【Abstract】 The designing of hydraulic fracture length is traditionally based on reservoirs’ physical properties and deliverability: producing formations of low permeability demand long fractures,while those of high permeability demand short fractures.However,the controlling function of deposition on hydraulic fracture length should also be considered in fluvial sedimentary formations.This paper gives evidence that river sandstone width confines fracture length using such methods as microseism,production analysis,pressure recovery,net pressure fitting.The Shihezi Formation in the Daniudi gas field is fluvial facies and hydraulic fracture surfaces orthogonalize the river orientation.Based on fracture spreading mechanisms and sandbody width,it is suggested that half fracture lengths in He 3 member be 90-120 m,and those in He 2 and He 1 members be 150-200 m.更多还原