塔河油田超大规模复合酸压技术  

Application and Analysis of Large Scale Composite Acid Fracturing Technology in Tahe Oilfield

作　　者：贾光亮[1] 张飞洲[1] 梁护站[1] 

机构地区：[1]中国石化华北石油局井下作业公司,河南郑州450042

出　　处：《石油钻探技术》2011年第6期78-81,共4页Petroleum Drilling Techniques

摘　　要：塔河油田碳酸盐岩储层孔喉配合度低、连通性差、非均质性强,造成常规酸压滤失量大、酸蚀裂缝穿透距离有限、不能沟通井筒远处的有利储集体或定容体。根据不同区块储层的地质、物性特征,曾经先后试验应用了复合酸压和大前置液水力扩容技术。复合酸压技术在一定程度上提高了有效裂缝的长度,但对于距离井筒较远储集体的沟通具有一定的局限;水力扩容技术加大前置液泵入量,进一步增加了水力裂缝的长度,但压裂施工结束后,裂缝迅速闭合,没有形成有效的沟通裂缝。结合以往压裂施工的经验,塔河油田试验应用了"大前置液+变黏酸体系+胶凝酸+支撑剂单级或多级泵注体系"超大规模复合酸压技术,以有效提高酸蚀裂缝穿透距离和有效裂缝缝长,确保有效沟通井筒周围的有利储集体和压后裂缝的导流能力。塔河油田已在31口井应用了超大规模复合酸压技术,其中11口井在酸压后初期平均产油量98.1t/d,增产效果较好。In order to solve the problem of poor pore-throat ratio and connection,strong heterogeneity,large fracturing fluid loss,the limited length of the acid etching fracture,difficulty in the communication between wellbore and far field region,Tahe Oilfield conducted experiments of compounding acid fracturing and hydraulic expansion in large amount of pad fluids in last few years according to its geological and physical characteristics in different areas.Compound acid fracturing technology has further improved the effective crack length,but it has limitations to communicate the wellbore and far field region.The hydraulic expansion technology,which increases the amount of pad fluids,increases the length of hydraulic fractures further.While after the fracturing is completed,the cracks closed quickly,and there is not enough effective communication cracks left.Combined with previous experience in fracturing,a complex pumping system that uses single-stage or multi-stage acid fracturing technology has been adopted by adding large amount of pad fluid,variable viscous and gelled acids.The technology can effectively improve the etched distance and the crack length,ensure communicating between the wellbore and around region,improve the conductivity of fractures after the pressure was released.

关 键 词：酸化压裂 奥陶系 碳酸盐岩油气藏 塔河油田 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]