霍克-布朗破坏准则
摩擦角
莫尔-库仑理论
凝聚力(化学)
井筒
主应力
岩土工程
理论(学习稳定性)
库仑
结构工程
地质学
工程类
数学
岩体分类
石油工程
数学分析
柯西应力张量
计算机科学
物理
有限元法
机器学习
电子
量子力学
出处
期刊:SPE drilling & completion
[Society of Petroleum Engineers]
日期:1999-06-01
卷期号:14 (02): 85-91
被引量:230
摘要
Summary The two most commonly used rock failure criteria in wellbore stability analyses are the Mohr–Coulomb criterion and the Drucker–Prager criterion. Neither of these is compatible with three-dimensional rock strength measurements that have explored the influence of the intermediate principal stress. This paper presents a modified Lade criterion which has the following desirable qualities: 1. it correctly describes the influence of the intermediate stress on rock strength, and therefore on wellbore stability, 2. it can be rearranged to give a closed-form solution for critical mud weight, for any wellbore orientation, and 3. only two rock strength parameters are required, such as cohesion and friction angle. The modified Lade criterion predicts critical mud weight values that are less conservative than those predicted by the Mohr–Coulomb criterion yet are not as unconservative as those predicted by the Drucker–Prager criterion. It also reveals that the required increase in mud weight when going from low hole angle to high hole angle is not as great as predicted by either the Mohr–Coulomb or Drucker–Prager criteria.
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