委内瑞拉奥里诺克胡宁区块丛式三维水平井安全钻井技术

发布时间：2018-02-09 23:59

本文关键词： 委内瑞拉奥里诺克浅层疏松砂岩丛式三维水平井大位移井眼轨迹控制井壁失稳水垂比储层保护　出处：《天然气工业》2016年08期 　论文类型：期刊论文

【摘要】：委内瑞拉奥里诺克胡宁区块储层埋藏浅,地层疏松,丛式三维大位移水平井具有位移大(1 300 m以上),水垂比高(3.1~4.5),井眼曲率大(7°/30 m~10°/30 m)的特点,钻井作业面临井眼轨迹控制难、摩阻扭矩大、井壁稳定性差以及尾管下入困难等技术难点。为此,通过对平台内不同偏移距下的三维井摩阻扭矩分析、井眼轨迹优化设计、极限井深模拟计算以及钻井液体系与配方优选,有效解决了因垂深浅、水平段长引起的钻具摩阻扭矩大与托压问题,以及弱固结性疏松砂岩储层井壁失稳和储层保护等技术难题;采用漂浮下套管并配合井口加压的复合技术来解决套管下入设计深度问题。该研究成果在胡宁区块现场应用7口水平井,其中E3-23井完钻垂深仅375.3 m,而斜深为1 984.1 m,水平位移达1 688.4 m,水垂比达到4.5,成为目前已钻完井中水垂比最大的三维水平井。该项技术可为国内浅层油气田高效开发提供借鉴。
[Abstract]:The reservoir in Orinoce Junin block, Venezuela, is shallow and loose, with the characteristics of large displacement of more than 1 300 m, high water aspect ratio of 3. 1 to 4. 5 m, and large curvature of 7 掳/ 30 mm / 10 掳/ 30 m of borehole. The drilling operation is faced with difficulties in well trajectory control. There are many technical difficulties, such as high friction torque, poor wellbore stability and difficulty in entering the tailpipe. In this paper, the optimum design of borehole trajectory is obtained through the analysis of 3D friction torque under different offsets in the platform. The simulation calculation of the limit well depth and the optimum selection of drilling fluid system and formula can effectively solve the problems of large friction torque and supporting pressure caused by the vertical depth and horizontal section length. And weak consolidation loose sandstone reservoir wellbore instability and reservoir protection and other technical problems; The design depth of casing is solved by using the composite technology of floating casing and wellhead pressure. The research results are applied in 7 horizontal wells in Hu Ning block. The vertical depth of well E3-23 is only 375.3 m, while the depth of deviation is 1.984.1 m, the horizontal displacement is 1 688.4 m, and the ratio of water to sag is 4.5, which has become the largest 3-D horizontal well in drilling and completion. This technique can be used as a reference for the efficient development of shallow oil and gas fields in China.
【作者单位】：中国石油集团钻井工程技术研究院;
【基金】：中国石油天然气集团公司重大科研项目“海外复杂油气藏安全高效钻井技术集成与应用”课题4“委内瑞拉胡宁4浅层大位移丛式三维水平井钻完井技术”(编号:2011D-4504)
【分类号】：TE243

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