压前评估在葡西油田古137区块压裂井中的应用

根据葡西油田古137区块开发压裂出现的压后产量达不到压裂投产的经济开发标准的问题,从压裂液体系、支撑剂的选用、纵向剖面上地应力条件对水力裂缝高度的影响3方面对以往压裂低效原因进行了分析评估。从这3方面进行优选,确定压裂施工规模,采用“二低、二高”的压裂施工参数设计思路提高近井导流能力,采用胶囊破胶剂与尾追常规破胶剂的双元破胶剂体系措施提高压裂液返排率,降低压裂液对储层和裂缝导流能力的伤害。2004年底进行了11口井压裂研究策略的现场压裂试验,获得较好效果,为该区块后续的开发井压裂提供了必要的技术保证。

Application of Pre-fracturing Evaluation for Fracturing Well in Block Gu-137 of Puxi Oilfield

As post-fracturing production of Block Gu-137 in Puxi Oilfield could not meet the economic development standards of fracturing production,this paper analyzed and appraised the reason for past inefficient fracturing from three factors influencing hydraulic fracture height,including fracturing fluid system,proppant optimization and ground stress on vertical section.Through optimization of above factors,we determined fracturing operation scale,increased the near well bore diversion ability according with the fracturing design of operation parameters under the idea of"two low and two high",which can enhance flow back rate of fracturing fluid with capsule breaker and binary breaker system used to trace conventional breaker,and decrease damage of fracturing fluid to reservoir and fracture flow conductivity.On-site fracturing test for 11 wells was performed at the end of 2004 and it has obtained pretty good results,proving the necessary technology guarantee for the sequent fracturing of development well in this block.