水力裂缝动态扩展的压裂液滤失模型  

Fluid loss model for dynamic propagation of hydraulic fractures

作　　者：罗攀 王崟 黄昊 孙晓 穆景福 LUO Pan;WANG Yin;HUANG Hao;SUN Xiao;MU Jingfu(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an,Shaanxi 710075,China;Exploration&Development Engineering Technology Research Center of Lacustrine Shale Gas in Shaanxi,Xi'an,Shaanxi 710075,China;N0.11 Oil Production Plant of Changqing Oilfield Company,PetroChina,Qingyang,Gansu 745000,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [2]陕西省页岩气勘探开发工程技术研究中心,陕西西安710075 [3]中国石油长庆油田分公司采油十一厂,甘肃庆阳745000

出　　处：《石油地质与工程》2020年第6期98-101,共4页Petroleum Geology and Engineering

基　　金：国家科技重大专项(2017ZX05039-004)。

摘　　要：为了解决经典滤失理论认为从压裂开始到结束的整个过程中水力裂缝长度均为裂缝最终长度这一认识带来的问题,通过建立考虑裂缝动态扩展的压裂液滤失计算的二维模型,利用古典五点隐式差分法对模型求解来研究压裂液在水力裂缝动态扩展中的滤失。结果表明,在裂缝扩展阶段,压裂液滤失速度随裂缝增长而增加,当裂缝长度稳定后,压裂液滤失速度才开始递减,与经典滤失理论计算的结果差异较大,但该模型由于考虑了裂缝动态扩展,更接近物理实际,对认清滤失过程、指导压裂设计具有一定意义。In order to solve the problem that the length of hydraulic fracture is the final length of fracture in the whole process from the beginning to the ending of fracturing according to the classical filtration theory,by establishing a 2D model of fracturing fluid filtration calculation considering the dynamic fracture propagation,the classical five point implicit difference method is used to solve the model to study the fluid filtration in the dynamic fracture propagation.The results show that in the stage of fracture propagation,the leak off rate of fracturing fluid increases with the growth of fracture.When the fracture length is stable,the leak off rate of fracturing fluid begins to decrease,which is quite different from that calculated by classical filtration theory.However,the model is closer to the physical reality because of considering the dynamic fracture propagation,which is good for recognizing the filtration process and guiding the fracturing design.

关 键 词：滤失模型 水力压裂 动态裂缝 二维滤失 动态滤失 

分 类 号：TE312[石油与天然气工程—油气田开发工程]