多级燃爆压裂及复合压裂数值模拟  

Numerical simulation of multistage deflagration fracturing and composite fracturing

作　　者：郭天魁[1] 王旭东 曲占庆[1] 王继伟 丁志睿 杨珂笼 马贵颖 GUO Tiankui;WANG Xudong;QU Zhanqing;WANG Jiwei;DING Zhirui;YANG Kelong;MA Guiying(School of Petroleum Engineering in China University of Petroleum(East China),Qingdao 266580,Shandong Province,P.R.China;China Offshore Oil International Co.Ltd.,Beijing 100028,P.R.China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国海洋石油国际有限公司,北京100028

出　　处：《深圳大学学报(理工版)》2025年第1期50-58,共9页Journal of Shenzhen University(Science and Engineering)

基　　金：国家重点研发计划资助项目(2020YFA0711800)。

摘　　要：为提高页岩气的开发效果,针对页岩气储层燃爆压裂裂缝扩展规律,基于连续-非连续方法,引入裂隙渗流模型与爆源模型构建燃爆压裂裂缝扩展模型,建立以裂缝范围和破裂度为评价指标的燃爆压裂效果评价体系.基于建立的燃爆压裂裂缝扩展模型,进行单级和多级燃爆压裂裂缝扩展模拟,并探究复合压裂作用下的改造效果.研究发现,燃爆压裂能够突破井底的应力集中,在应力冲击作用下沿井周形成初始径向裂缝,而后在高压爆生气体的驱动下裂缝长度增加.相较于单级脉冲,3级燃爆脉冲下的破裂度提高14.5%,裂缝长度增加10.7%以上;采用复合压裂工艺在地应力差为10 MPa时仍可形成多条裂缝.研究结果可为页岩气储层的开发提供指导.To improve the efficiency of shale gas development,we conduct a study on fracture propagation during deflagration fracturing in shale gas reservoirs.Using the continuous-discontinuous method,we develop a deflagration fracture propagation model by integrating the fracture seepage model and the explosion source model.An evaluation system of deflagration fracturing performance is constructed with fracture range and fracture degree as evaluation indexes.Based on the established deflagration fracture propagation model,the single and multiple deflagration fracture propagation simulations are carried out,and the transformation effect under the combined fracturing is explored.The results indicate that deflagration fracturing can break through the stress concentration at the bottom of the well,forming initial radial fractures along the well circumference under the action of stress impact,followed by a significant increase in fracture length under the drive of high-pressure explosive gas.Compared with the single stage pulse,the fracture degree and fracture range under multistage blasting pulse(tertiary)are greatly improved,i.e.,the fracture degree is increased by 14.5%,and the fracture length is increased over 10.7%.Multiple fractures can be formed when the in-situ stress difference is 10 MPa by the composite fracturing process.The results can provide guidance for the development of shale gas reservoirs.

关 键 词：油气田开发 页岩气 燃爆压裂 复合压裂 连续-非连续方法 数值模拟 

分 类 号：TE357[石油与天然气工程—油气田开发工程]