考虑爆燃气体滤失和多裂缝的复合射孔裂缝扩展动态模拟  

Modeling of fracture propagation by compound perforation considering deflagration gas filtration and multi-fracture

作　　者：罗伟[1] 李海涛[1] 粟超 何明辉[3] 阳明君[1] 刘涛[1] 黄诚[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油川庆钻探工程公司地质勘探开发研究院,四川成都610051 [3]中国石油长庆油田公司第二采油厂,甘肃庆阳745100

出　　处：《油气地质与采收率》2013年第4期102-104,110,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"低渗气藏水平井分段压裂及控水完井技术研究"(2011ZX05022-006-004HZ)

摘　　要：裂缝几何尺寸参数的准确预测是复合射孔优化设计和增产增注效果评价的前提条件,在复合射孔实施过程中,爆燃气体滤失和多裂缝会对裂缝扩展形态产生影响。在分析中外爆燃气体驱动裂缝扩展数学模型的基础上,结合流体力学、弹性力学和线弹性断裂力学理论,建立了全面考虑爆燃气体滤失和多裂缝的复合射孔裂缝扩展数学模型,通过假设与多个变量相关的裂缝内爆燃气体压力分布函数,利用迭代法实现了模型的数值耦合求解,获得了裂缝几何尺寸随时间的动态变化规律。实例计算结果表明:地层渗透率和裂缝条数对复合射孔裂缝扩展形态影响很大,缝长随地层渗透率和裂缝条数的增加而减小;不考虑爆燃气体滤失和多裂缝导致计算得到的缝长偏大,且相对误差随地层渗透率和裂缝条数的增大而增大。The accurate prediction of fracture geometry parameters is the base for compound perforation optimization design and production evaluation.The deflagration gas filtration and multi-fracture will affect fracture propagation in the implementation of compound perforation.Combined with the theory of fluid mechanics,elastic mechanics and linear elastic fracture mechanics,the model of fracture propagation is developed overall considering the effect of deflagration gas filtration and multi-fracture.A function with multiple variables describing gas pressure distribution in crack is proposed herein to realize the numerical resolution of the model using the iteration method,and the dynamic change law of fracture geometry with time is obtained.The results of example show that,the formation permeability and the number of fractures have high influence on the fracture propagation.Ignoring deflagration gas filtration and multi-fracture will result in higher calculation values of fracture length and the relative errors will amplify with the increase of the formation permeability and the number of fractures.

关 键 词：复合射孔 爆燃气体 滤失 多裂缝 裂缝扩展 动态模拟 

分 类 号：TF357.3[冶金工程—冶金机械及自动化]