摘要
深层小井眼采用随钻扩眼器进行扩眼作业时存在井眼缩径、固井质量差和卡钻频繁等问题。为解决该问题,基于随钻扩眼器基本结构和工作原理,采用新型变径结构,研制了一种多级变径随钻扩眼器;建立了随钻扩眼尺寸与主动活塞轴向位移之间的函数关系,并分析了扩眼器刀翼的受力情况;采用双因素计算方法分析了该扩眼器的钻压分配情况,得到了随钻扩眼器钻压分配比对扩眼尺寸、钻具锐度及地层抗压强度的影响规律。分析得知,随钻扩眼器的钻压分配比与钻遇地层抗压强度、扩眼尺寸呈正比,与扩眼器锐度呈反比,该扩眼器的理论井径扩大率为7%~20%。研究认为:对随钻扩眼器进行钻压分配分析,可以指导扩眼器的设计及领眼钻头的选型;研制的多级变径随钻扩眼器为提高扩眼效率提供了技术支撑。
Reaming operations in deep slim holes with a reamer-while-drilling faced various problems,such as borehole shrinkage,poor cementing quality and frequent sticking etc.A reamer-while-drilling with multistage variable diameter was developed by adopting a new variable diameter structure following the basic structure and working principle of reamer-while-drilling.The functional relationship between the reaming-while-drilling size and the axial displacement of the active piston was built,and the forces on the blade of the reamer were investigated.The weight-on-bit distribution on the reamer was analyzed by the two-factor calculation method,and the influence laws of the weight-on-bit ratio of the reamer-while-drilling on reaming size,drilling tool sharpness,and the compressive strength of the formation were obtained.The analysis showed that the weight-on-bit ratio of the reamer-while-drilling was directly proportional to the compressive strength of the penetrated formation and reaming size,and inversely proportional to reamer sharpness.The theoretical borehole diameter enlargement rate of the reamer was 7%–20%.The paper concludes that weight-on-bit distribution analysis of reamers while drilling can guide the design of such reamers and the selection of pilot bits,and the developed reamer-while-drilling with multistage variable diameter can provide effective technical support for improving reaming efficiency.
作者
王站稳
张红
施雷
冯云
涂忆柳
WANG Zhanwen;ZHANG Hong;SHI Lei;FENG Yun;TU Yiliu(School of Mechanical Engineering,Yangtze University,Jingzhou,Hubei,434023,China;Hubei Engineering Research Center for Oil&Gas Drilling and Completion Tools,Jingzhou,Hubei,434023,China)
出处
《石油钻探技术》
CAS
CSCD
北大核心
2023年第1期51-56,共6页
Petroleum Drilling Techniques
基金
国家采油装备工程技术研究中心开放基金资助项目“抽油机井杆管偏磨系统动力学行为研究”(编号:ZBKJ2021-A-02)
中海石油(中国)有限公司湛江分公司科研项目“水下采油树密封材料与结构优化研究”(编号:CCL2019ZJFN0853)联合资助。
关键词
小井眼
随钻扩眼器
多级变径
受力分析
钻压分配
结构设计
井径扩大率
slim hole
reamer while drilling
multistage variable diameter
force analysis
weight-on-bit distribution
structural design
borehole diameter enlargement rate
