摘要: |
基于钻头与地层相互作用模型及钻进趋势评价指标,提出一种底部钻具组合造斜率预测的新方法——平衡趋势法,认为底部钻具组合的造斜率应与钻进趋势角为零时的井眼曲率相等。结合钻具组合受力分析模型和钻头与地层相互作用模型,推导出钻进趋势角的计算表达式,建立平衡趋势法求解底部钻具组合造斜率的计算方法。实例验证表明,该方法具有较高的计算精度,能够实现钻头和地层的各向异性、地层倾角及倾向等各种因素对底部钻具组合造斜率的定量评价,为今后底部钻具结构的合理配置以及钻井参数的优选提供有力的理论依据和分析手段。 |
关键词: 钻井 底部钻具组合 造斜率 钻进趋势角 井眼曲率 平衡趋势法 |
DOI:10.3969/j.issn.1673-5005.2017.01.010 |
分类号::TE 21 |
文献标识码:A |
基金项目:国家科技重大专项(2016ZX05022002);国家自然科学基金项目(51674284);国家“863”计划(2012AA091501) |
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A new method for build-up rate prediction of bottom-hole assembly in well drilling |
SHI Yucai1, GUAN Zhichuan1, ZHAO Hongshan2, HUANG Genlu1
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(1.School of Petroleum Engineering in China University of Petroleum,Qingdao 266580,China;2.Drilling Technology Research Institute, Shengli Petroleum Engineering Company Limited, SINOPEC, Dongying 257017, China)
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Abstract: |
Based on a bit-rock interaction model and an evaluation index method of drilling tendency, a new method, named as the equilibrium tendency method, was presented to predict the build-up rate of bottom-hole assembly (BHA), which assumes that the build-up rate is equal to the borehole curvature while the drilling tendency angle is zero. The calculation formula of the drilling tendency angle was derived, and the equilibrium tendency method was then established in coupling the mechanical model of BHA and the bit-rock interaction model. Case studies of field operation have shown that the new method has a high calculation precision and can be quantitatively used to evaluate the build-up rate considering various factors, such as the features of drilling bits, the anisotropy of rocks, the stratum dip angle and its variation trend. The new method is useful for designing the BHA 's structure and optimizing the drilling parameters. |
Key words: drilling bottom-hole assembly build-up rate drilling tendency angle borehole curvature equilibrium tendency method |