暂堵压裂技术在坪北油田的研究应用

文章通过对坪北油田三叠系延长组C62、C61和C4＋52主要含油层位地应力大小及方位特征、裂逢开启与延伸条件、暂堵剂评选及配套技术等方面研究，提出了缝内桥堵主裂缝通道，促使裂缝净压力升高，从而压开新的支裂缝或沟通更多微裂缝，增大油层泄流面积的暂堵压裂增产技术思路。2004～2005年现场应用11井次，工艺成功率91％，有效率81．8％，累计增油3058t，投入产出比1：9。暂堵压裂技术的应用旨在为进一步提高坪北特低渗油藏采收率探索一条新途径。

APPLICATION OF TEMPORARY DIVERTING FRACTURING TECHNOLOGY IN PINGBEI OILFIELD

By investigating the features of formation stress and azimuth, the conditions of fracture initiation and extension, selection of temporary plugging agent and matching technology for main oil zones of Yanchang Group C62,C61 and C4 in Triassic system in Pingbei Oilfield, a innovative diverting fracturing technology was developed, which use bridge plugging main fracture channel to increase fracture net pressure, to open new branch fractures and communicate most microfracture, therefore increase drainage area of the oil zones. The technology was used in 11 wells from 2004 to 2005 with technical success rate of 91%, efficiency of 81.8%, cumulative oil increment of 3058t and input output ratio of 1:9. The diverting fracturing technology is promising way to improve recovery ratio of extra-low permeability reservoir in Pingbei Oilfield.