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[1]李高仁,史亚红,夏宏泉,等.基于Mogi-Coulomb强度准则的井壁稳定性力学分析新方法*[J].中国安全生产科学技术,2018,14(10):70-75.[doi:10.11731/j.issn.1673-193x.2018.10.011]
 LI Gaoren,SHI Yahong,XIA Hongquan,et al.New method for mechanical analysis of wellbore stability based on Mogi-Coulomb strength criterion[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2018,14(10):70-75.[doi:10.11731/j.issn.1673-193x.2018.10.011]
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基于Mogi-Coulomb强度准则的井壁稳定性力学分析新方法*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
14
期数:
2018年10期
页码:
70-75
栏目:
职业安全卫生管理与技术
出版日期:
2018-10-31

文章信息/Info

Title:
New method for mechanical analysis of wellbore stability based on Mogi-Coulomb strength criterion
文章编号:
1673-193X(2018)-10-0070-06
作者:
李高仁1史亚红2夏宏泉2韩龙飞2
(1.长庆油田分公司勘探开发研究院,陕西 西安 710021;2.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)
Author(s):
LI Gaoren1 SHI Yahong2 XIA Hongquan2 HAN Longfei2
(1. Research Institute of Exploration and Development, Changqing Oilfield Company, Xi'an Shaanxi 710021, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu Sichuan 610500, China)
关键词:
井壁稳定MogiCoulomb破坏准则坍塌压力破裂压力钻井液密度
Keywords:
wellbore stability MogiCoulomb failure criterion collapse pressure fracture pressure drilling fluid density
分类号:
X937
DOI:
10.11731/j.issn.1673-193x.2018.10.011
文献标志码:
A
摘要:
传统井壁坍塌失稳分析模型是基于M-C破坏准则而建立的,该方法忽略了中间主应力对岩石强度的影响,常使得预测的钻井液密度过于保守。为此,引入考虑中间主应力的Mg-C破坏准则建立任意井眼的井壁稳定性评价新模型,通过数值模拟法分析了不同地应力状态下的井斜角和方位角对井壁稳定性的影响。研究结果表明: Mg-C准则克服了M-C准则忽略中间主应力低估岩石强度的影响,其计算结果略低于M-C准则的计算结果,有助于提高钻速,降低钻井成本;正断层地应力状态时,沿最小水平主应力方向钻进时,井壁稳定性最好;走滑断层地应力状态时,沿最大与最小水平主应力之间的某一临界角钻进时井壁最稳定;逆断层地应力状态时,沿最大水平主应力方向钻进时井壁最稳定;该模型有助于指导现场钻井井眼轨迹的优化设计及安全施工。
Abstract:
The traditional analysis models of wellbore collapse instability have been established based on the M-C failure criterion, which neglected the influence of the intermediate principal stress on the rock strength and often made the predicted drilling fluid density too conservative. Therefore, the Mg-C failure criterion considering the intermediate principal stress was introduced to establish a new model of wellbore stability evaluation for any wellbore, and the influence of deviation angle and azimuth angle on the wellbore stability under different insitu stress patterns was analyzed by using the numerical simulation method. The results showed that the Mg-C criterion overcame the influence of the M-C criterion on ignoring the intermediate principal stress and underestimating the rock strength, and its calculation results were slightly lower than those of the M-C criterion, which contributed to increase the drilling rate and reduce the drilling cost. Under the normal fault insitu stress pattern, the wellbore stability was the best when drilling in the direction of the minimum horizontal principal stress. Under the strikeslip fault insitu stress pattern, the wellbore stability was the best when drilling along a certain critical angle between the maximum and minimum horizontal principal stress. Under the reverse fault insitu stress pattern, the wellbore stability was the best when drilling in the direction of the maximum horizontal principal stress. This model is helpful to guide the optimization design and safe construction of the hole trajectory in the field well drilling.

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备注/Memo

备注/Memo:
收稿日期: 2018-06-23
基金项目: 国家科技重大专项(2016ZX05050)
作者简介: 李高仁,学士,高级工程师,主要研究方向为岩石力学的测井精细解释方法及应用。
通信作者: 史亚红,硕士研究生,主要研究方向为岩石力学的测井精细解释方法及应用。
更新日期/Last Update: 2018-11-07