兴古7—H173井大位移井钻井技术研究

2017-08-24 04:38:50张静伟
科技创新导报 2017年14期

张静伟

DOI:10.16660/j.cnki.1674-098X.2017.14.036

摘 要:兴古7-H173井由于地层存在井壁不稳、油藏压力系数偏高的特点,通过优化井身结构、井眼轨迹设计、钻具组合、钻井参数,配合采用长城钻探自主研发的MWD随钻测量系统、旋转导向钻进系统等技术,最大限度地提供复合进尺比例,快速准确中靶,实现井眼轨道与设计轨迹一致。全井解决了浅地层造斜难度大、水平段携岩困难、起下钻摩阻大扭矩大等技术难题,为国内大位移水平井技术提供了宝贵的建议。

关键词:大位移井 兴古7-H173井 钻具组合 钻井液 钻井技术

中图分类号:TE24 文献标识码:A 文章编号:1674-098X(2017)05(b)-0036-02

Study on Drilling Technology of Large Displacement Wells in Xing Gu 7-H173 Well

Zhang Jingwei

(CNPC the Great Wall Drilling Technology Service Company, Panjin Liaoning, 124010, China)

Abstract: Because of the characteristics of strata Xinggu 7-H173 well exists wellbore instability, reservoir pressure coefficient is high, by optimizing the structure of the well, the well trajectory design, BHA drilling parameters, with the use of self-developed MWD the Great Wall drilling MWD system, rotary steering drilling system, the maximum composite footage the proportion of fast and accurate target, realize the trajectory design and trajectory consistency. The whole well solves the shallow oblique horizontal section technical problems under the cutting carrying friction torque, providing valuable suggestions for the domestic large displacement horizontal well.

Key Words: Large displacement well; Xing Gu 7-H173 well; Drilling tool combination;Drilling fluid; Drilling technology

興古7-H173井位于辽宁省盘锦市兴隆台区采油厂,构造位置属于辽河断陷盆地西部凹陷中南段兴隆台潜山兴古7块,为了更好地开采该区块裂缝型块状底水变质岩潜山油藏[1],该井到完钻先后采用随钻测量系统、旋转导向钻进系统、旋转导向测井系统、随钻测井系统等技术,提高了钻井效率,降低了钻井成本,完钻辽河油田闭合距最长的大位移井。

1 兴古7-H173井施工技术难点

(1)地层层位复杂,地层或硬或软[2],造斜率差,在一开井眼从383 m开始造斜施工,设计初始曲率1°/30 m,地层松软,后期曲率达到4.4°/30 m,造斜率控制存在困难。

(2)水平段和斜井段长,钻柱的摩阻、扭矩大。在导向滑动钻进中,钻具躺在下井壁,钻具与井壁的接触面积大,致使钻井施工过程中摩阻升高、扭矩增大。

(3)三开井下温度较高,发生仪器故障,在3 000 m处出现探管高温烧毁现象,严重影响信号传输。

2 兴古7-H173井钻井技术

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