| 杨锡明,朱亮,李俊,李雨萌.准噶尔盆地温压地层岩石可钻性特性分析[J].矿产勘查,2026,2(2):290-298 |
| 准噶尔盆地温压地层岩石可钻性特性分析 |
| Analysis of rock drillability characteristics of high stress strata in Junggar Basin based on cohesion model |
| 投稿时间：2025-03-13 |
| DOI：10.20008/j.kckc.202602007 |
| 中文关键词: 可钻性 高应力 有限元 裂纹扩展 |
| 英文关键词: drillability high stress finite element crack propagation |
| 基金项目:本文受中石油吐哈油田分公司项目“深井超深井及复杂深层水平井优快钻井基础研究”(F202300345)资助。 |
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| 中文摘要: |
| 准噶尔盆地深层地质构造承受显著的地应力作用，针对传统基于常温常压条件的可钻性评估体系难以精确表征该区域岩体的力学响应特性的难点，本研究通过选取典型钻井岩心样本开展高温高压环境下的可钻性模拟实验的方法，揭示了特定温压耦合作用下围压与岩石破碎效率的正相关性机制。为深入探究该现象本质，本研究创新性地构建了融合温度-围压双重因素的岩石单齿切削数值模型，依托 ABAQUS有限元平台进行多物理场耦合分析。结果表明:围压作用下岩石破碎程度降低，切向力波动幅值减小；岩体内部微裂纹生成增加但主裂纹扩展受限；PDC刀具前缘剪切裂纹与底部拉伸裂纹数量显著减少，导致破岩难度增大。当围压达到 30 MPa时，切向力增长 40%，破岩比功提升 45%。研究揭示了围压环境下应力场呈前缘集中分布特征，为深层钻井参数优化提供了理论支撑。 |
| 英文摘要: |
| The deep geological structure of Junggar Basin is subjected to significant in-situ stress. It is diffi-cult to accurately characterize the mechanical response characteristics of rock mass in this area by the traditionaldrillability evaluation system based on normal temperature and pressure conditions. Based on this, this study re-veals the positive correlation mechanism between confining pressure and rock crushing efficiency under specifictemperature and pressure coupling by selecting typical drilling core samples to carry out drillability simulation ex-periments under high temperature and high pressure environment. In order to further explore the essence of this phe-nomenon, this study innovatively constructs a numerical model of rock single-tooth cutting with temperature-confining pressure dual factors, and carries out multi-physical field coupling analysis based on ABAQUS finite ele-ment platform. The results show that under the action of confining pressure, the degree of rock fragmentation de-creases and the amplitude of tangential force fluctuation decreases. The micro-crack generation in the rock mass in-creases but the main crack propagation is limited. The number of shear cracks at the leading edge and tensile cracksat the bottom of the PDC tool is significantly reduced, resulting in increased difficulty in rock breaking. When theconfining pressure reaches 30 MPa, the tangential force increases by 40%, and the specific work of rock breaking in-creases by 45%. The study reveals that the stress field under the confining pressure environment is concentrated inthe front edge, which provides theoretical support for the optimization of deep drilling parameters. |
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