支撑剂在非贯穿型裂缝网络中的输送特征模拟

Simulation of proppant transportation characteristics in non?鄄penetrating fracture network

徐加祥 希尔艾力·伊米提 杨立峰 付颖 张艳博 王湘婷

辽宁石油化工大学石油天然气工程学院，辽宁 抚顺 113001 中国石油勘探开发研究院压裂酸化技术服务中心，北京 100083

College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China Fracturing and Acidifying Service Center, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

为了探究主次裂缝不完全相交条件下支撑剂在裂缝网络中的分布特征，文中设计了“上浮式”和“下沉式”2种类型的缝网结构。在考虑支撑剂、携砂液及支撑剂颗粒间相互作用的基础上，建立了支撑剂在复杂裂缝网络中的运移模型，并分析了主次裂缝相交长度及次级裂缝位置对支撑剂在缝网中分布的影响。数值模拟结果表明：对于“上浮式”裂缝网络，由于主裂缝中携砂液自下而上向二级裂缝分流，有效地减缓了主裂缝中支撑剂的沉降速度，改善了其中支撑剂的分布状态；在“下沉式”裂缝网络中，主裂缝内携砂液向下分流不利于支撑剂在主裂缝中的铺置，且二级裂缝中支撑剂多集中分布在主裂缝正下方的区域。在“上浮式”和“下沉式”裂缝网络中支撑剂的整体填充比例均随着二级裂缝到主裂缝入口距离以及上浮或下沉距离的增加而增加。

In order to investigate the distribution characteristics of proppant in fracture network with incomplete intersection of primary and secondary fractures, two types of fracture network structures, namely "floating" and "sinking", were designed. On the basis of considering the interaction between proppant, sand-carrying fluid and proppant particles, the transport model of proppant in complex fracture network is established, and the influence of the intersection length of primary and secondary fractures and the location of secondary fractures on the distribution of proppant in fracture network is analyzed. The numerical simulation results show that for the floating fracture network, because the sand-carrying fluid in the primary fracture flows from bottom to top to the secondary fracture, the settling speed of proppant in the primary fracture is effectively slowed down, and the distribution of proppant in the primary fracture is improved. In the sinking fracture network, the downward diversion of sand-carrying fluid in the primary fracture is not conducive to the proppant placement, and the proppant is mainly distributed in the area directly below the primary fracture in the secondary fracture. In both floating and sinking fracture networks, the proportion of proppant increases with the increase of the distance from the secondary fracture to the primary fracture entrance and the height of floating or sinking.

10.6056/dkyqt202204016