天然气工业2025，Vol.45Issue(11)：1-13,13.DOI:10.3787/j.issn.1000-0976.2025.11.001
大位移钻井岩屑运移与钻柱力学作用机理与模型
Mechanism and model of interaction between cuttings transport and drill string mechanics in the process of extended-reach well drilling
摘要
Abstract
An extended-reach well is an advanced well type for the efficient exploitation of oil and gas resources in complex environments such as oceans and mountains,but its drilling has long been facing two major challenges,i.e.,high drag & torque and difficult hole cleaning.Existing studies usually treat drill string mechanics and hole cleaning as two relatively independent issues,so they cannot fully reveal the complex interaction mechanisms between drill string and cuttings.In this paper,stirring diffusion factor and drill string-cuttings contact stress are introduced as quantitative indicators to establish a coupling mechanic model which takes comprehensive consideration of drill string mechanic behaviors and cuttings transport process.Then,based on the mechanical analysis and numerical simulation of particles,the critical conditions for the dynamic conversion of cuttings flow patterns among fully suspended flow,two-layer flow and three-layer flow are presented,and the chart of cuttings phase state in the process of extended-reach well drilling is plotted.In addition,it is revealed that there is a delay effect during the conversion of flow patterns.Finally,corresponding suggestions for optimizing drilling parameters are proposed.The following results are obtained.First,in the Ø311.2 mm hole section,cuttings transport is mainly in the pattern of three-layer flow,and poor hole cleaning leads to frequent pipe sticking,while in the Ø235.0 mm hole section,cuttings are mainly transported in the patterns of fully suspended flow and two-layer flow,and the hole is well cleaned with an average dimensionless cuttings bed height of only 3.58％.Second,displacement,rate of penetration and rotational speed jointly affect hole cleaning degree and torque loss caused by cuttings,and they have a complex and mutual influence on drill string stress and cuttings transport.Third,compared with the optimization of a single drilling parameter,the collaborated optimization of multiple drilling parameters can achieve better hole cleaning and drag & torque reduction.In conclusion,the established coupling model of interaction between drill string mechanics and cuttings transport can interpret the abnormal change of ground torque,and the prepared cuttings transport phase diagram and parameter optimization scheme provide a theoretical basis and methodological support for the safe and efficient drilling of extended-reach wells.关键词
大位移井/钻柱力学/岩屑运移/管柱阻卡/摩阻扭矩/钻柱与岩屑相互作用/流型分析/钻井参数优化Key words
Extended-reach well/Drill string mechanics/Cutting transport/Pipe sticking/Drag & torque/Pipe-cuttings interaction/Flow pattern analysis/Drilling parameter optimization分类
能源科技引用本文复制引用
高德利,赵军,黄文君..大位移钻井岩屑运移与钻柱力学作用机理与模型[J].天然气工业,2025,45(11):1-13,13.基金项目
国家自然科学基金重点项目"复杂结构'井工厂'立体设计建设基础研究"(编号:52234002)、国家自然科学基金优青基金项目"油气井管柱力学与工程"(编号:52222401)、国家自然科学基金重大项目课题"深海多金属结核采输系统总体设计理论与风险防控方法"(编号:52394255)、国家重点研发计划项目"海洋石油大直径指向式旋转导向系统研制"(编号:2023YFC2810900). （编号:52234002）
