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海洋石油钻井单筒双井表层套管下入挂碰模拟研究
Simulation study on collision during surface casing running in twinhole-inmonobore wells for offshore oil drilling
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- DOI:
- DOI: 10.3969/j.issn.1001-2206.2025.04.001
- 作者:
- 沈吉阳, 程玉琨, 信雅琪, 鲁佳琦, 王刚
SHEN Jiyang, CHENG Yukun, XIN Yaqi, LU Jiaqi, WANG Gang
- 作者单位:
- 1. 中国石油集团海洋工程有限公司钻井分公司, 天津 300451;2. 中国石油集团海洋工程有限公司油气技术分公司, 天津 30043. 中国石油大学(华东), 山东青岛 26658051;
- 关键词:
- 单筒双井; 套管下入; 挠曲变形; 挂碰; 数值模拟
twinhole-in-monobore well;casing running;flexural deflection;collision;numerical simulation
- 摘要:
- 海洋石油钻井工程单筒双井技术是一种先进的导管共用钻井技术，在单筒双井表层套管下入过程中，时常出现两井套管相互挂碰遇阻问题，严重影响钻井时效。首次基于井眼轨道微分方程及Frenet活动标架，精准表征了遇阻段相对空间位置关系，建立了表层套管初始接触位置及接触长度计算模型；同时，深入解析套管柱在斜直井段和造斜段与井壁的接触位置关系及其下入力学行为，建立了套管柱下入过程中的挠曲变形模型，并基于CH6-H1和CH6-H2井实测数据进行验证，模型精度良好；进一步利用ABAQUS有限元软件建立了单筒双井套管柱下入遇阻分析数值模型，揭示了导管偏斜、环空间隙、接箍倒角、导管通径结构及单根长度对套管柱下入挂碰的影响特征，形成了一套单筒双井表层套管挂碰遇阻影响规律分析方法。最后从导管防斜保直、优化导管通径结构和调整接箍倒角三方面，提出了表层套管防挂碰预防措施，以期为同类型井组施工提供借鉴。
The twinhole-in-monobore well technology for offshore oil drilling is an advanced drilling technique that shares a single conductor. However, during the surface casing running process in twinhole-in-monobore wells, collision and running resistance between the two casings frequently occur, seriously affecting drilling efficiency. Based on the differential equation of borehole trajectory and the Frenet moving frame, this paper precisely characterized the relative positional relationship of the resistance section and established a calculation model for the initial contact position and contact length of the surface casing. Meanwhile, the contact position relationship and the running mechanical behavior of the casing string in the oblique vertical section and the inclined section were deeply analyzed, and a flexural deformation model of the casing string during running was established. The model was verified based on the measured data of CH6-H1 and CH6-H2 wells, demonstrating good accuracy. Furthermore, a numerical analysis model for casing running resistance was established using ABAQUS finite element software, revealing the influence characteristics of conductor deviation, annulus gap, coupling chamfering, conductor diameter structure, and single conductor length on collision behavior during casing running. This formed a set of methods for analyzing the influence patterns of collision and running resistance of surface casing in twinhole-in-monobore wells. Finally, preventive measures against surface casing collision were proposed from three aspects: preventing conductor deviation and maintaining straightness, optimizing the conductor’s inner diameter structure, and adjusting the coupling chamfer. These findings provide a beneficial reference for the construction of the same type of well groups.