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超短半径径向水平井中柔性钻具动态行为研究

Research on the dynamic behavior of flexible drilling tools in ultrashort-radius radial horizontal wells.

作者信息

Lin Zhiqiang, Luo Min, Wang Jing, Xiu Tingting, Li Qiaozhen

机构信息

School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, China.

Mathematics and Statistics College, Northeast Petroleum University, Daqing, China.

出版信息

Sci Rep. 2024 Mar 27;14(1):7230. doi: 10.1038/s41598-024-57742-3.

DOI:10.1038/s41598-024-57742-3
PMID:38538686
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11349905/
Abstract

A flexible drilling tool is a special drilling tool for ultrashort-radius radial horizontal wells. This tool is composed of many parts and has the characteristics of a multibody system. In this paper, a numerical method for the dynamic analysis of flexible drilling tools is proposed. The flexible drill tool is discretized into spatial beam elements, while the multilayer contact of the flexible drilling tool is represented by the multilayer dynamic gap element, and the dynamic model of the multibody system for the flexible drilling tool's multilayer contact is established, considering the interaction force between the drill bit and the rock. The nonlinear dynamic equation is solved using the Newmark method and Newton-Raphson method. An analysis of the dynamic behavior of a flexible drilling tool is conducted. The results indicate that the flexible drilling tool experiences vortex formation due to the interaction between the flexible drilling pipe and the guide pipe, leading to increased friction and wear. This situation hinders safe drilling operations with flexible drilling tools. The collision force of the flexible drilling tool near the bottom of the hole is more severe than that of the other tool types, which may lead to failure of the connection.

摘要

挠性钻具是一种用于超短半径径向水平井的特殊钻具。该钻具由多个部件组成，具有多体系统的特性。本文提出了一种挠性钻具动力学分析的数值方法。将挠性钻具离散为空间梁单元，采用多层动态间隙单元来描述挠性钻具的多层接触，考虑钻头与岩石之间的相互作用力，建立了挠性钻具多层接触多体系统的动力学模型。利用Newmark法和Newton-Raphson法求解非线性动力学方程。对挠性钻具的动力学行为进行了分析。结果表明，挠性钻具由于挠性钻杆与导向管之间的相互作用而形成涡旋，导致摩擦和磨损增加。这种情况阻碍了挠性钻具的安全钻井作业。挠性钻具在井底附近的碰撞力比其他类型的钻具更严重，这可能导致连接失效。

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