胜北深层致密砂岩气藏水平井细分切割体积压裂技术

针对胜北区块深层致密砂岩气藏前期直井压裂效果差、难以实现储量有效动用的问题，吐哈油田从2019年起结合区块储层地质特征，以提高储层改造体积、保证裂缝导流能力、降低压裂施工风险为核心，开展了水平井体积压裂工艺技术研究，形成了以“细分切割分段分簇+大规模体积改造+高温混合压裂液体系+高温可溶桥塞+小粒径组合粒径支撑剂+控制施工砂比”等为核心的压裂技术。截至2021年2月，共完成3口井的现场实施，单井产量取得突破，胜北503H井压裂后最高油气当量近100 t/d。现场实践证明，该技术在胜北区块深层致密气藏适应性良好，为区块致密气藏的有效动用奠定了技术基础。

Horizontal-well subdivision cutting and volume fracturing technology for the deep tight sandstone gas reservoirs in the Shengbei Block

To cope with poor early vertical well fracturing effect and difficult effective reserve production in the deep tight sandstone gas reservoirs of the Shengbei Block, Tuha Oilfield began to research the horizontal-well volume fracturing technology based on the reservoir geological characteristics of this block in 2019, focusing on improving the stimulated reservoir volume, ensuring the fracture conductivity and reducing fracturing construction risk. As a result, several key fracturing technologies are developed, including subdivision cutting, multi-stage and multi-cluster, large-scale volume fracturing, high-temperature mixed fracturing fluid system, high-temperature soluble bridge plug, combined small particle size proppant and construction proppant concentration control. By February 2021, these technologies had been practically implemented in 3 wells and realized breakthrough in single-well production rate. The maximum oil and gas equivalent of Well Shengbei 503H after fracturing is as high as 100 t/d. The field practice proves that this technology is well adaptive to the deep tight gas reservoirs in the Shengbei Block and lays the foundation for the effective production of the tight gas reservoirs in this block.