以高地应力为主要控制因素的超深高压钻井工程井眼轨迹优化——以塔里木盆地顺北地区奥陶系碳酸盐岩储层为例

IF 1.1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Ruiqiang Yang, W. Ding, Zhan Zhao, Jingtao Liu, Shuo Shi, Teng Zhao, Peng Han
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引用次数: 1

摘要

随着油气勘探开发的不断深入,井眼轨迹优化逐渐成为油气行业关注的焦点。针对塔里木盆地顺北地区井筒失稳问题,在岩石力学、钻井工程和数学方法的指导下,结合实际地质资料,以地应力为主要控制因素,科学地优化了井眼轨迹。本文利用线弹性理论分析了井筒的应力状态,建立了井筒应力分布模型。利用不同的岩石破坏准则建立了井筒稳定性的安全窗模型,计算了地层的坍塌压力和破裂压力。在此基础上,定义了安全泥浆密度窗口,实现井筒轨迹优化。最后,讨论了影响井筒稳定性的因素,并评价了不同岩石破坏准则的适用性。结果表明,在研究区正断层应力状态条件下,水平最小主应力方向是最佳钻井方向,其中井眼倾角α>50°是最佳井眼轨迹。大斜度井和水平井的井筒稳定性优于小斜度井和垂直井。Mogi-Coulomb准则的计算结果可以更准确地描述现场应力场的条件。数值方法直接获得了不同井眼轨迹的安全窗口,对于优化井眼轨迹和提高井筒稳定性具有很强的实用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Well trajectory optimization of ultra-deep and high-pressure drilling engineering based on high in-situ stress as the main control factor: a case study from the Ordovician carbonated reservoir in Shunbei area of Tarim basin
With increasing oil and gas exploration and development, well trajectory optimization has gradually become the focus of the oil and gas industry. Considering the wellbore instability in the Shunbei area of the Tarim Basin, the well trajectory was scientifically optimized under the guidance of rock mechanics, drilling engineering, and mathematical methods, combined with actual geologic data, and with in situ stress as the main controlling factor. In this paper, the stress state of the wellbore is analyzed by linear elastic theory to establish the stress distribution model of the wellbore. The safety window model of wellbore stability is established using different rock failure criteria to calculate the collapse pressure and fracture pressure of the formation. Based on this, the safe mud density window is defined to achieve wellbore trajectory optimization. Finally, the influence factors of wellbore stability are discussed, and the applicability of different rock failure criteria is evaluated. The results indicate that under the normal faulting stress regime condition in the study area, the direction of horizontal minimum principal stress is the best drilling direction, where the borehole inclination angle of α > 50° is the optimal well trajectory. The wellbore stabilities of high-angle deviated wells and horizontal wells are better than those of low-angle deviated wells and vertical wells. The calculation results of the Mogi-Coulomb criterion can describe the conditions of the in situ stress field more accurately. The safe windows for different well trajectories are obtained directly by the numerical method, which is very practical for optimizing well trajectories and improving wellbore stability.
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来源期刊
CiteScore
2.50
自引率
8.30%
发文量
126
期刊介绍: ***Jointly published by the American Association of Petroleum Geologists (AAPG) and the Society of Exploration Geophysicists (SEG)*** Interpretation is a new, peer-reviewed journal for advancing the practice of subsurface interpretation.
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