Journal of Petroleum Exploration and Production Technology ( IF 2.2 ) Pub Date : 2021-03-18 , DOI: 10.1007/s13202-021-01134-0 Yongxue Lin , Shanyong Liu , Shuyang Gao , Yuan Yuan , Jia Wang , Siqi Xia
Hydraulic fracturing is the key technology in the development of shale gas reservoirs, and it mainly adopts volume fracturing technology to communicate hydraulic fractures with natural fractures to increase the drainage area. In view of the difficulty in characterizing the complex fractures created by multistaged fracturing in horizontal shale gas wells and the immaturity of fracturing optimization design methods, this study first evaluated the stimulation effect of fracturing technology based on treatment data and microseismic data. Then, the fracture characteristics after frac were considered, and a post-frac simulation was studied based on the discrete fracture network (DFN) model and the microseismic monitoring data as constraints. Finally, from the simulation results, an optimal design method of volume fracturing for shale gas was proposed based on the evaluation of the frac effects. The National Shale Gas Demonstration Zone in Zhaotong, Sichuan Basin was used as an example to study the optimal frac design of shale gas wells. The results show that (1) after optimizing the design, the optimal interval range is 50–70 m, the liquid volume of a single stage is 1800–2200 m3, the amount of sand is 80 m~120 t, and the slurry rate is 10–12 m3/min. (2) Two different frac design schemes were implemented in two wells on the same platform, and the production of the optimized design scheme was 14.7% greater than the original scheme. Therefore, the frac optimization design based on evaluating the fracturing effect can better guide the development of subsequent shale gas wells in this area.
中文翻译:
基于压裂效果的页岩气体积压裂优化设计研究-以四川昭通页岩气示范区为例
水力压裂是页岩气藏开发中的关键技术,它主要采用体积压裂技术将水力压裂与天然压裂相通,以增加排水面积。鉴于水平页岩气井多段压裂难以表征复杂裂缝的特点以及压裂优化设计方法的不成熟,本研究首先根据处理数据和微震数据评估了压裂技术的增产效果。然后,考虑了压裂后的裂缝特征,并基于离散裂缝网络(DFN)模型和微震监测数据作为约束条件,进行了压裂后模拟研究。最后,根据仿真结果,在评价压裂效果的基础上,提出了页岩气体积压裂的最佳设计方法。以四川盆地昭通国家级页岩气示范区为例,研究页岩气井的最佳压裂设计。结果表明:(1)优化设计后,最佳间隔范围为50–70 m,单级液体体积为1800–2200 m如图3所示,砂的量为80m〜120t,淤浆速率为10-12m 3 / min。(2)在同一平台的两口井中实施了两种不同的压裂设计方案,优化设计方案的产量比原始方案增加了14.7%。因此,基于评价压裂效果的压裂优化设计可以更好地指导该地区后续页岩气井的开发。