引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 273次   下载 171 本文二维码信息
码上扫一扫!
分享到: 微信 更多
基于位移不连续模型的多裂缝应力干扰极限距离计算
闫相祯1, 董卫2, 樊恒3, 闫怡飞2, 许建国1,4
作者单位E-mail
闫相祯1, 董卫2, 樊恒3, 闫怡飞2, 许建国1,4 1. 中国石油大学油气CAE技术研究中心, 山东青岛 266580
2. 中国石油大学机电工程学院, 山东青岛 266580
3. 西安石油大学电子工程学院, 陕西西安 710000
4. 中国石油吉林油田分公司, 吉林松原 138000 
樊恒(1987-),男,讲师,博士,研究方向为油气工程力学与安全。E-mail:fanheng1@126.com 
摘要:
利用MTS试验装置对"R13区块"的致密砂岩岩心进行小试样试验,获得"R13区块"致密砂岩的岩石力学参数(弹性模量、泊松比等)。忽略地层内水力裂缝面的不规则性,将其简化为互相平行的光滑裂缝面。考虑到地层在裂缝面的不连续性,将裂缝视为连续地层的内部不连续边界,采用位移不连续理论建立边界元模型,研究多裂缝系统周围的地层应力分布和不同簇数、不同布缝方式下的裂缝群缝间应力干扰的极限距离。结果表明,人工多裂缝的出现明显改变了裂缝周围应力场的分布,裂缝群簇数越多影响距离越大,但簇数的增加对影响距离的改变逐渐趋于平缓,呈对数增长,而段内裂缝间距(20~30 m)的改变基本不影响应力干扰的极限距离。基于位移不连续理论的边界元模型能够准确地计算裂缝群周围地层应力场分布和裂缝群缝间应力干扰极限距离。
关键词:  多裂缝  应力干扰  位移不连续理论  极限距离
DOI:10.3969/j.issn.1673-5005.2017.06.017
分类号:
基金项目:国家自然科学基金项目(51374228);中国博士后科学基金项目(2017M612375);国家科技重大专项(2016ZX05017-003-01);中国石油天然气集团公司重点实验室项目(2016A-3905)
Critical distance of stress shadow of multiple-cracks based on displacement discontinuity model
YAN Xiangzhen1, DONG Wei2, FAN Heng3, YAN Yifei2, XU Jianguo1,4
Abstract:
A small specimen test is conducted in MTS to get the elastic modulus and Poisson's ratio of tight sandstone core in R13 field. The irregularity of hydraulic crack surface is ignored, and the cracks are simplified as smooth and parallel to each other. Considering the discontinuity of the multi-cracks, they are treated as discontinuous boundaries of the continuous stratum. Then the displacement discontinuity method is used to construct a boundary element model, which is applicable to calculate the distribution of stress around the multi-crack system, and determine the critical distance of the crack swarms' stress shadow with different clusters and different ways of cloth sewn. The results show that the appearance of artificial multiple-cracks has significantly changed the distribution of stress field around the cracks. The more the cluster number, the longer the distance takes effect. But the influence of the cluster number increasing on the distance becomes smaller, taking on a logarithmic tendency. However, the change of crack spacing between 20 and 30 meters, in a single stage has little influence on the critical distance of stress shadow. This study indicates that the boundary element model based on the displacement discontinuity theory can accurately predict the distribution of the stress field around the multiple-cracks and the critical distance of the crack swarms' stress shadow.
Key words:  multiple-cracks  stress shadow  displacement discontinuity method  critical distance
版权所有 中国石油大学学报(自然科学版)编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国教育部 主办单位:中国石油大学
地址: 青岛市黄岛区长江西路66号中国石油大学期刊社 邮编:266580 电话:0532-86983496 E-mail: journal@upc.edu.cn
本系统由:北京勤云科技发展有限公司设计