| 考虑地层各向异性井壁稳定性研究进展 |
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| 基金项目： | Project supported by the National Natural Science Foundation of China “Paleogene continental rich organic shale fracture research in Jiyang Depression of Bohai Bay Basin”(No.41372139), “Quantitative studies of marine organic matter rich shale fracture development degree and main controlling factors of south China in the lower Paleozoic”(No.41072098) |
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| 摘 要： | 考虑地层各向异性井壁稳定性研究对地质特征复杂的非常规油气储层开发意义重大,在对国内外近10年相关研究成果调研基础上对其主要进展进行了综述。影响井壁稳定性的地层各向异性因素包括:区域地应力大小、区域应力性质、岩石物理力学参数差异、井身结构、水化膨胀、微裂缝及弱层理盘角度等。详细梳理了各单因素对井壁稳定性的影响机制,地层应力系统及岩石强度对井壁稳定性的影响最大。对于具弱层理盘地层,沿不同钻井方向岩石强度差异较大;沿弱层理面地层容易发生水化膨胀,且往往微裂缝发育,井壁容易失稳,因此应采用高抑制钻井液体系或油基钻井液。在复杂地层钻井过程中,以上各单因素相伴而生,进行各单因素耦合条件下井壁稳定性分析对合理制定应对策略具有重要意义。加强考虑地层各向异性井壁稳定性基础理论、数值模拟及基于三维可视化建模的近实时井壁稳定动态模拟预测研究是该研究在未来的主要发展方向。
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Progress of Borehole Stability Considering Strata Anisotropy |
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| Authors: | Yin Shuai Ding Wenlong Yang Wenna Zhao Wei Zhang Min Cong Sen |
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| Institution: | 1. School of Energy Resources, China University of Geosciences , Beijing 100083, China;2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;3. Institute of Porous Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China;4. Langfang Branch of PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China |
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| Abstract: | The research of borehole stability that considers strata anisotropy has great significance for the development of unconventional oil and gas reservoir. In this paper, based on the systematic research both at home and abroad in the recent ten years, the overview of the main progress of this research was provided. The main anisotropy factors that affect the borehole stability include the regional stress size, the nature of regional stress, the difference of rock physical and mechanical parameters, well structure, hydration swelling, micro-cracks, and the angle of weak bedding plane. The influence mechanism of single parameter on the borehole stability and the strata stress system were introduced in detail. The strength of rock had the most importance on the borehole stability. For the strata that has weak bedding plane, the strength of rock has great difference in different direction of drilling. When drilling along the weak bedding plane, it is easy to cause hydration swelling, and the micro-cracks always develop, and in this condition, borehole is easy to be unstable. Therefore, the high inhibition drilling fluid system or oil-based drilling fluid should be used and at the same time the influence of weak bedding plane on the borehole stability should be studied. When drilling in complex strata, these single factors can not always exist alone, but co-exist. As a result, the couple research of each single factor on the influence of borehole stability has great significance in establishing reasonable countermeasures. With the deep understanding of complex geological characteristics of unconventional oil and gas reservoir, the enhancement of the study of basic theory, numerical simulation and near realtime dynamic simulation research based on 3D visual modeling of borehole stability that considers strata anisotropy is the main developing direction in the future. |
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| Keywords: | Borehole stability Strata anisotropy Weak bedding plane |
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