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[1]张明明,范翔宇,杨博仲,等.基于修正Mogi-Coulomb准则的井周剪切失稳区域分析[J].断块油气田,2020,27(05):647-652.[doi:10.6056/dkyqt202005020]
 ZHANG Mingming,FAN Xiangyu,YANG Bozhong,et al.Analysis of shear instability region around wellbore based on extended Mogi-Coulomb criterion[J].Fault-Block Oil and Gas Field,2020,27(05):647-652.[doi:10.6056/dkyqt202005020]
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基于修正Mogi-Coulomb准则的井周剪切失稳区域分析(PDF)
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《断块油气田》[ISSN:1005-8907/CN:41-1219/TE]

卷:
27
期数:
2020年05
页码:
647-652
栏目:
钻采工艺
出版日期:
2020-09-25

文章信息/Info

Title:
Analysis of shear instability region around wellbore based on extended Mogi-Coulomb criterion
作者:
张明明1范翔宇1杨博仲2肖振华3赵鹏斐1么勃卫1
1.油气藏地质及开发工程国家重点实验室,四川 成都 610500;2.中国石油集团公司川庆钻探工程有限公司钻采工程技术研究院,
四川 广汉 618300;3.中国石油西南油气田公司勘探事业部,四川 成都 610500
Author(s):
ZHANG Mingming1 FAN Xiangyu1 YANG Bozhong2 XIAO Zhenhua3 ZHAO Pengfei1 YAO Bowei1
1.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu 610500, China; 2.CCDC Drilling & Production Engineering Technology Research Institute, PetroChina, Guanghan 618300, China; 3.Exploration Division of Southwest Oil and Gasfield Company, PetroChina, Chengdu 610500, China
关键词:
主应力空间强度准则井壁坍塌区域井壁稳定修正MG-C准则
Keywords:
principal stress space strength criterion collapse region around wellbore borehole stability extended MG-C criterion
分类号:
TE21
DOI:
10.6056/dkyqt202005020
文献标志码:
A
摘要:
为认识井壁失稳机理,文中在3种岩石强度准则分析的基础上,基于修正Mogi-Coulomb准则(EMG-C准则)建立了斜井井周剪切失稳区域预测模型,研究了中间主应力及井眼轨迹对井周剪切失稳区域分布规律的影响。研究发现,Mohr-Coulomb准则(M-C准则)预测井周剪切崩落区域为椭圆形,EMG-C准则分析井眼形状近似于四边形;相比于EMG-C准则,M-C准则得到的不同井周角的井壁处坍塌压力各向异性强,且最大值偏高,但井周崩落范围减小;中间主应力减弱了井壁处坍塌压力及井周坍塌压力各向异性,但增大了井周剪切崩落区域,EMG-C准则考虑了中间主应力及高应力环境岩石的非线性破坏特征,井周剪切崩落区域预测位置与形状和M-C准则预测的有很大区别。研究结果可为钻井液密度、井眼扩大率的控制提供指导和帮助,提高油气资源开发效益。
Abstract:
In order to understand wellbore instability mechanism, based on the analysis of three rock strength criteria,  a prediction model for the shear instability region around deviated borehole is established by using the extended Mogi-Coulomb criterion(EMG-C criterion), and the influence of intermediate principal stress and wellbore trajectory on the distribution rule of shear instability region around wellbore is studied. The research results show that the area of shear collapse around the wellbore predicted by Mohr-鄄Coulomb criterion(M-C criterion) is elliptic, while the borehole shape predicted by EMG-C criterion is approximately quadrilateral. Compared with EMG-C criterion, the collapse pressure at the wellbore wall with different borehole circumference angles obtained by M-C criterion is of strong anisotropy and the maximum value is higher, but the collapse range around the wellbore decreases. The intermediate principal stress decreases the collapse pressure and its anisotropy at the wellbore wall, but increases the range of shear collapse region around the borehole. The EMG-C criterion considers the nonlinear failure characteristics of rocks in intermediate principal stress and high stress environment, and the prediction position and shape of the shear collapse region around the borehole is quite different from that predicted by M-C criterion. The research results can provide guidance and help for the control of drilling fluid density and borehole enlargement ratio, and improve the efficiency of oil and gas resources development.

参考文献/References:

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相似文献/References:

[1]贾利春,黄晓嘉,郭正温.井壁稳定性研究中考虑中间主应力强度准则的对比分析[J].断块油气田,2017,24(01):105.[doi:10.6056/dkyqt201701024]
 JIA Lichun,HUANG Xiaojia,GUO Zhengwen.Comparative analysis of intermediate principal stress strength criterion of wellbore stability[J].Fault-Block Oil and Gas Field,2017,24(05):105.[doi:10.6056/dkyqt201701024]

备注/Memo

备注/Memo:
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更新日期/Last Update: 2020-09-24