深层油气藏多级迂回暂堵压裂技术研究  

Multistage circuitous-temporary plugging fracturing technology for deep oil-gas reservoirs

作　　者：蒋廷学 卞晓冰[1,2] JIANG Tingxue;BIAN Xiaobing(State Key Laboratory of Shale Oil and Gas Enrichment and Mechanisms and Effective Development,Beijing 102206,P.R.China;Sinopec Research Institute of Petroleum Engineering,Beijing 102206,P.R.China)

机构地区：[1]页岩油气有效开发国家重点实验室,北京102206 [2]中国石油化工股份有限公司石油工程技术研究院,北京102206

出　　处：《深圳大学学报（理工版）》2021年第6期590-597,共8页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(U19B6003);中石化科技攻关资助项目(P20046-3)

摘　　要：中国埋深超过3500 m的深层油气资源量丰富,但深层油气藏水平井分段压裂面临裂缝净压力小、压力窗口有限的难题,导致常规暂堵压裂难以实施.本研究提出多级迂回暂堵压裂的技术思路,建立相应的数学模型并采用牛顿迭代法进行求解,并对迂回暂堵的时机和降排量幅度等工艺参数进行模拟及优化.结果表明,迂回暂堵可以较大幅度地提高压裂施工压力窗口及主裂缝的净压力,有助于实现深层-超深层油气藏压裂裂缝的转向及改造体积的大幅度提高;多级迂回暂堵压裂可在单级迂回暂堵压裂的基础上,进一步增加压裂施工压力窗口及主裂缝净压力,有助于实现深层-超深层油气藏压裂裂缝复杂性程度及改造体积的最大化;其他工艺成本包括压裂车组等的费用基本维持不变.示例井应用效果证明,压后产量可比邻井提高30%以上.因此,多级迂回暂堵压裂技术对提高深层及超深层油气藏的压裂效果、开发水平及经济效益等,都具有重要的指导意义和应用价值.China is rich in deep oil and gas resources with buried depth of more than 3500 m.To overcome the technical difficulties in the implementation of conventional temporary plugging technology for the staged fracturing of horizontal well of deep oil-gas reservoirs,such as the small net pressure of fractures and the limited pressure window,we propse a technical idea of multi-level circuitous temporary plugging of fracturing and then build a mathematical model and solve this model by Newton iterative method.On this basis,we conduct the substantive research work on the simulation and optimization of technical parameters,such as the timing of circuitous temporary plugging,the decrease of pump rates,etc.The research results show that circuitous temporary plugging can significantly improve the pressure window of fracturing construction and the net pressure of the main fracture,which is helpful to realize the diversion of the fractures of deep and ultra-deep oil-gas reservoir and greatly increase the reformed volume;multistage circuitous temporary plugging fracturing can further increase the fracturing pressure window and the net pressure of the main fracture based on single-level circuitous temporary plugging,which is conducive to achieving the complexity of the fractures of deep and ultra-deep oil-gas reservoir and the maximization of the reformed volume.And meanwhile remaining the cost of fracturing vehicles and other processes basically unchanged.The application results of test wells show that the production after fracturing can be increased by more than 30%compared with adjacent wells.Therefore,the multi-level circuitous temporary plugging technology provides important guiding significance and reference for improving the fracturing effect,exploitation level and economic benefits of deep-ultra-deep oil-gas reservoir.

关 键 词：深层油气藏 低渗透储层 水平井 迂回暂堵 多级压裂 压裂参数 

分 类 号：TE348[石油与天然气工程—油气田开发工程] TE358