海洋工程装备与技术

海洋工程装备与技术 ›› 2014, Vol. 1 ›› Issue (1): 14-20.

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海上大位移井固井顶替数值模拟研究

李昊1, 王金堂1, 孙宝江1, 曹成章2, 李春莉3, 徐渴望1   

  1. 1. 中国石油大学(华东)石油工程学院, 山东 青岛 266580
    2. 中石化胜利石油工程有限公司钻井工艺研究院, 山东 东营 257017
    3. 中国石化胜利油田有限公司胜利采油厂地质研究所, 山东 东营 257015
  • 收稿日期:2014-02-22 出版日期:2014-01-30 发布日期:2017-12-07
  • 作者简介:

    作者简介: 李昊(1978--), 男, 博士, 讲师, 主要从事油气井流动力学与工程及海洋石油工程方面的研究.

  • 基金资助:
    国家科技重大专项(2011ZX05026-001-02);国家863计划(2012AA091501);教育部"长江学者和创新团队发展计划"(IRT1086)

Simulation Analysis of Cementing Displacement in Offshore Extended Reach Well

Hao LI1, Jin-tang WANG1, Bao-jiang SUN1, Cheng-zhang CAO2, Chun-li LI3, Ke-wang XU1   

  1. 1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China
    2. Institute of Drilling Technology, Sinopec Shengli Oilfield Service Corporation, Dongying, Shandong 257017, China
    3. Institute of Geology, Shengli Oil Production Factory, Sinopec Shengli Oilfield Limited Company, Dongying, Shandong 257015, China
  • Received:2014-02-22 Online:2014-01-30 Published:2017-12-07

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摘要：

顶替效率及界面稳定性是海上大位移井固井顶替能否成功的关键因素.应用计算流体力学理论, 结合南海一口大位移井固井基础资料, 通过数值模拟得到了水泥浆流变性以及不同井眼情况对固井顶替效率的影响规律.计算结果表明: 增大水泥浆稠度系数, 顶替效率增加; 增大水泥浆流性系数, 顶替效率减小; 固井顶替效率随着屈服应力增加先增大后降低, 最终趋于稳定; 固井时水泥浆的流性指数不宜过高, n值应控制在0.6以内; 稠度系数应大于1.5 Pa·sn, 不应超过3 Pa·sn; 屈服应力在10~18 Pa的范围区间, 有利于水泥浆顶替钻井液.偏心度对界面稳定性影响很大, 建议将偏心度控制在0.5以内; 使用套管扶正器, 界面的稳定性明显改善, 优选出最佳刚性扶正器旋流角为60°; 套管屈曲对界面稳定性的影响显著, 使环空界面的顶替效率明显降低.

关键词: 大位移井, 环空结构, 顶替效率, 界面稳定性, 数值模拟

Abstract:

Displacement efficiency and interface stability are critical to the success of offshore extended reach well cementing. According to the theory of computational fluid dynamics and the basic cementing data of extended reach well in South China Sea, the cement slurry rheological property and the influence of different borehole conditions on cementing displacement are obtained by numerical simulation. The calculations demonstrate that displacement efficiency increases with the increase of cement slurry consistency index and decreases with the increase of cement slurry flow index; well-cementing displacement efficiency first increases and then decreases and finally tends to be stable as the yield stress increases; the flow index of cement slurry should not be too high when cementing, and the value of n should be controlled within 0.6; the consistency index should be greater than 1.5 Pa·sn, but not exceed 3 Pa·sn; yield stress in the range of 10~18 Pa is advantageous to replace drilling fluid with the cement slurry. It is suggested that the eccentricity should be controlled within 0.5 as eccentricity has a great influence on the stability of interface; the stability of interface is obviously improved by using casing centralizer, and the optimized best rigid centralizer swirl angle is 60°; casing buckling, causing significant reduction of displacement efficiency in the annular interface, has a great influence on the stability of interface.

Key words: extended reach well, annular structure, displacement efficiency, interface stability, numerical simulation

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