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葡萄花油田进入开发后期,高含水井及重复压裂井逐年增多,具有改造潜力且发育较好的葡萄花储层不断减少,薄差储层成为油田后续措施改造的重点。受此类储层物性及自身条件限制,采用常规压裂改造工艺增油效果不理想。葡萄花外围薄差储层主要分布于敖南及台肇区块,在这两个区块开展了多层段大排量压裂现场试验6口井,施工排量达到4.0~7.5m~3/min,平均单井压裂2.1个层段,单层有效厚度0.5m,平均单层施工液量115m~3,单层加砂9m~3。试验初期,平均单井产液强度1.83t/d·m,产油强度1.83t/d·m;与同区块储层条件相近的11口压裂投产井相比,初期产油增加1.7t/d,产液强度增加0.68t/d·m,平均单井年累计多产油207.3t。现场监测表明,大排量压裂在葡萄花外围薄差储层上产生了主缝与微缝共同存在的复杂裂缝网络,实现了提高裂缝改造体积的目的。
Putaohua oilfield enters the late stage of development, and high-water wells and repeated fracturing wells increase year by year. Grapevine reservoirs with the potential for improvement and better development continue to decrease, and thin difference reservoirs have become the focus of the follow-up measures for oilfield reconstruction. Subject to the physical properties of such reservoirs and their own conditions, the use of conventional fracturing technology to enhance oil production is not satisfactory. The thin peripheral reservoirs on the periphery of Putaohua are mainly distributed in Aoan and Taizao blocks. In these two blocks, there are 6 wells in large-scale fracturing test with multi-stage displacement and the construction displacement is 4.0-7.5m 3 / min, the average single-well fracturing 2.1 layers, the effective thickness of single-layer 0.5m, the average single-layer construction fluid volume 115m ~ 3, single-layer sand 9m ~ 3. At the beginning of the experiment, the average single-well production liquid strength was 1.83t / d · m and the oil production intensity was 1.83t / d · m. Compared with the 11 fracturing production wells with similar reservoir conditions in the same block, the initial oil production increased by 1.7t / d, the liquid production intensity increased 0.68t / d · m, the average single well annual cumulative 207.3t more oil. Field monitoring shows that the large displacement fracturing produces a complex fracture network in which the main seam and the micro seam coexist on the thin difference reservoir on the periphery of the grape flower, and the purpose of improving the volume of the fracture reconstruction is achieved.