Distance calculation and anti-collision evaluation between the reference well and offset wells

doi:10.7623/syxb201908009

Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (8): 983-989.DOI: 10.7623/syxb201908009

• Petroleum Engineering • Previous Articles Next Articles

Distance calculation and anti-collision evaluation between the reference well and offset wells

Liu Xiushan

Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China

Received:2019-01-23 Revised:2019-06-01 Online:2019-08-25 Published:2019-08-28

邻井距离解算及防碰评价

刘修善

中国石化石油工程技术研究院北京 100101

通讯作者: 刘修善
作者简介:刘修善,男,1962年11月生,1984年获大庆石油学院学士学位,1998年获中国石油勘探开发研究院博士学位,现为中国石化石油工程技术研究院教授级高级工程师,主要从事导向钻井工艺、井下信息测量与控制等方面的研究工作。Email:liuxs.sripe@sinopec.com
基金资助:
国家科技重大专项（2017ZX05005-005）资助。

Abstract

Abstract:

To meet the technical requirements of well anti-collision evaluation, this study creates the methods of distance calculation and anti-collision evaluation between the reference well and offset wells, and also performs case analysis. By establishing the wellhead coordinate systems and their transformation relation based on the earth ellipsoid, the positioning error caused by the deformation of map projection and no consideration of the curvature of ellipsoid surface were eliminated to achieve the precise positioning of offset wells. According to the theory of extreme value of function and differential geometry, the methods of calculating the closest approach distance and the normal-plane distance based on the derivative function are presented, which not only solves the problem that the existing methods may miss the risk point of well collision, but also can apply to various wellbore trajectory models. Based on the direction of scanning vector of well anti-collision and the posture of error ellipsoid of wellbore trajectory, this paper proposes an analytical method to solve the intersection position of scanning vector and error ellipsoid, which lays a foundation for the accurate calculation of separation factor, and the research results provide a complete set of evaluation methods for well anti-collision evaluation.

Key words: drilling theory, directional drilling, borehole trajectory, well anti-collision, error analysis

摘要：

为满足邻井防碰评价的技术需求，建立了邻井距离解算及防碰评价方法，并进行算例分析。通过基于地球椭球建立井口坐标系及其转换关系，消除了因地图投影存在变形和不考虑地球椭球面弯曲等带来的定位误差，实现了邻井精准定位。根据函数极值和微分几何理论，提出了基于导函数解算最近距离和法面距离的方法，不仅解决了现有方法可能遗漏邻井相碰风险点问题，而且适用于各种井眼轨迹模型。基于邻井防碰的扫描矢径方向和井眼轨迹的误差椭球姿态，提出了求解扫描矢径与误差椭球交点位置的解析法，为准确计算分离系数奠定了基础，并提供了成套的邻井防碰评价方法。

关键词: 钻井理论, 定向钻井, 井眼轨迹, 邻井防碰, 误差分析

CLC Number:

TE243

Liu Xiushan. Distance calculation and anti-collision evaluation between the reference well and offset wells[J]. Acta Petrolei Sinica, 2019, 40(8): 983-989.

刘修善. 邻井距离解算及防碰评价[J]. 石油学报, 2019, 40(8): 983-989.

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Distance calculation and anti-collision evaluation between the reference well and offset wells

邻井距离解算及防碰评价

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