页岩Ⅰ区块体积压裂缝网模拟研究

Research on Fracture Network Modeling of Volume Fracturing in Shale ⅠArea

陆国琛 秦丙林 郭志辉 王颖 李乾

LU Guochen QIN Binglin GUO Zhihui WANG Ying LI Qian

中国石油化工股份有限公司上海海洋油气分公司石油工程技术研究院, 上海 200120

Petroleum Engineering Institute of SINOPEC Shanghai Offshore Oil&Gas Company, Shanghai 200120, China

为解决页岩Ⅰ区块气藏渗透率低、气体流动困难的问题，对该区块体积压裂缝网进行模拟计算，验证是否能够形成体积缝网。在分析体积压裂缝网形成的地质、力学、工程条件基础上，采用数值模拟方法得到页岩Ⅰ区块体积压裂的最优裂缝参数：裂缝半长200 m、裂缝段数为10段、裂缝导流能力为10 μm2·cm。以优化的裂缝参数为目标，采用数值模拟的方法计算得最佳铺砂浓度为4 kg/m3，主裂缝导流能力为10 μm2·cm，并且能够形成体积缝网形态。研究结果表明，页岩Ⅰ区块能够进行有效的体积压裂，形成有效缝网。

To solve the problems of low permeability and gas flowing difficulty, numerical simulation for the volume fracturing network was carried out to test the probability of forming network. By analyzing the factors of geology, mechanics and engineering conditions that influence the forming of volume fracturing network, we figure out the optimization parameters of the network in shale Ⅰarea with the method of numerical simulation, which means 200 meters fracture half-length, 10 fracture number, and 10 μm2·cm fracture conductivity. Aiming at the optimization parameters, we calculate the best sanding concentration and the fracture conductivity by means of numerical simulation. The calculated sanding concentration is 4 kg/m3, the main fracture conductivity is 10 μm2·cm and the volume fracture is formed effectively. It is concluded that effective volume fracturing could be conducted and the fracture network could be formed in shale Ⅰ Area.

https://doi.org/10.3969/j.issn.1008-2336.2019.04.032