通过将多弹性,热和化学效应与先进的数值技术相结合,进行全面的井口稳定性建模
Eissa M Shokir1, Samy Sallam1, Mostafa M Abdelhafiz2,3
1Department of Petroleum Engineering, Cairo University, 12613 Giza, Egypt.
ACS omega
|January 6, 2025
概括
优化钻井液盐度和控制温度是提高极端环境中井口稳定的关键. 盐度较高的泥土提高了形成的稳定性,而温度控制减轻了应力变化和崩风险.
科学领域:
- 地质技术工程 地质技术工程
- 石油工程是石油工程中的一个.
- 计算力学 计算力学 计算力学
背景情况:
- 井口稳定性在极端钻井环境中是一个关键的挑战,其特点是高压和高温.
- 现有的模型往往不能完全整合合热,液压和化学 (THC) 效应,这对于准确的模拟至关重要.
研究的目的:
- 开发和验证精细的数值模型,其中包括波波弹性,热和化学效应,用于井口稳定性分析.
- 研究流体特性和钻井条件对孔隙压力和应力分布的影响.
- 为了比较不同故障标准的预测能力,对井井崩.
主要方法:
- 开发了四个精细的数值模型,整合了热,化学和液压效应.
- 四个钻井失效标准的比较分析 (莫尔-库伦,德鲁克-普拉格,莫吉-库伦,修改-拉德).
- 详细调查液体盐度和温度对孔隙压力和应力场的影响.
主要成果:
- 气孔弹性,热和化学效应显著影响井口周围的孔隙压力和应力分布.
- 较高的盐度钻井泥增加有效应力,降低孔隙压力,增强形成的稳定性.
- 热效应在应力分布中占主导地位,在最小水平应力下触角应力达到峰值;冷却减少了崩面积,加热增加了它.
- 莫尔-库伦和德鲁克-普拉格标准预测了更大的崩区域,提供了更保守的稳定性评估.
结论:
- 优化钻井液的盐度和控制温度对于在具有挑战性的形成中提高井口稳定性至关重要.
- 盐度较高的泥土通过增加有效应力和降低孔隙压力来提高稳定性.
- 谨慎的温度管理可以减轻应力变化和降低崩风险,为更安全,更有效的钻井操作提供实用指南.
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