过断层井段井壁稳定性分析

发布时间：2018-03-11 21:32

本文选题：过断层井段　切入点：地应力　出处：《中国海上油气》2017年01期 　论文类型：期刊论文

【摘要】：考虑断层周围地层非均质性和各向异性,根据弱面强度准则,分析了地层各向异性对地应力的影响,探讨了井壁坍塌压力随断层走向及倾角的变化规律,建立了过断层的坍塌压力计算模型,开展了不同性质断层构造坍塌压力分析,结果表明:随着Eh/Ev、vv/vh值的增大,水平最大应力、水平最小应力增加,过断层应考虑地层各向异性对地应力的影响;不同的断层类型、断层走向及倾角所对应的坍塌压力存在差异性,且不存在单调递增或递减的井斜方位,安全区域和危险区域交替出现;井眼轨迹设计应考虑断层类型及弱面结构,选择合理的钻入角钻穿断层。将本文预测模型用于渤海油田A井取得了良好工程效果,井眼扩大率基本小于10%。本文研究结果对过断层时钻井安全具有指导意义,可为井眼轨迹设计提供理论参考。
[Abstract]:Considering the heterogeneity and anisotropy of strata around the fault, according to the weak plane strength criterion, the influence of formation anisotropy on ground stress is analyzed, and the variation law of wellbore collapse pressure with fault strike and dip angle is discussed. The calculation model of collapse pressure is established, and the collapse pressure analysis of different fault structures is carried out. The results show that the maximum horizontal stress and the minimum horizontal stress increase with the increase of Eh / Evvv / Vh value. The influence of formation anisotropy on ground stress should be taken into account in crossing faults, the collapse pressure corresponding to different fault types, fault strike and dip angle is different, and there is no monotone increasing or decreasing well inclination azimuth. The safe area and the dangerous area appear alternately, the hole trajectory design should consider the fault type and the weak plane structure, select the reasonable drilling angle to drill through the fault. The application of this prediction model to the A well in Bohai Oilfield has obtained good engineering effect. The borehole expansion rate is basically less than 10. The results of this paper are of guiding significance for drilling safety during fault crossing and can provide theoretical reference for hole trajectory design.
【作者单位】：中海石油(中国)有限公司天津分公司;中国石油大学(北京)油气资源与探测国家重点实验室;
【基金】：中海石油(中国)有限公司综合科研项目“多元热流体、蒸汽吞吐和SAGD先导试验关键技术研究(编号:YXKY-2013-TJ-01)”部分研究成果
【分类号】：TE21

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