双层套管开窗侧钻中钻头力学分析  

MECHANICAL ANALYSIS OF THE DRILL BIT IN THE DUAL CASING SIDETRACKING

作　　者：孔春岩[1] 梁政[1] 张德荣[1] 

机构地区：[1]西南石油大学机电工程学院,成都610500

出　　处：《机械强度》2016年第3期531-536,共6页Journal of Mechanical Strength

基　　金：国家重大专项项目(2011ZX05049-002-002)资助~~

摘　　要：在双层套管开窗侧钻中,油层套管、水泥环、技术套管和地层岩石的硬度都各不相同,并且钻头在双层套管开窗过程中和导向器、油层套管、水泥环、技术套管、地层岩石的接触面不同。考虑开窗钻头在双层套管开窗侧钻时和油层套管壁、水泥环、技术套管壁及地层岩石的实际接触情况,建立双层套管开窗钻头弯矩数学模型,并结合现场工程实例,利用Matlab软件求解出三种不同工况下钻头弯矩与钻头水平移动距离的关系曲线。进而借鉴金属切削力学理论,研究钻头在开窗侧钻过程中的切削力、切削扭矩,校验开窗钻头的强度,提出了防止双层套管开窗侧钻过程中发生钻头憋卡断裂事故的技术建议。分析计算可为双层套管开窗钻头的设计与施工参数确定提供参考。In the dual casing sidetracking,the oil casing wall,cement ring,technical casing wall and rock formations＇ hardness are different,furthermore,in the process of dual casing sidetracking the bit in contact with the oil casing wall,cement ring,technical casing wall and rock formations are different,bit bending moment certainly exist. Considered the situation of that the sidetracking bit in actual contact with the oil casing wall,cement ring,technical casing wall and rock formations,established the bending moment mathematical model of the dual casing sidetracking drill bit,and combined with examples using MATLAB software solved the relationship between the drill bit bending moment and the drill bit horizontal moving distance under that Three different working conditions was given. Further reference the theory of metal cutting mechanics,researched cutting force and cutting torque of the drill bit in sidetracking the process,checked the sidetracking bit strength,provided technical advice to prevent the drill bit holded in and stuck fracture accident occurred in the dual casing sidetracking process. The analysis and calculation could provide the reference to designing the sidetracking bit and determinating construction parameters in the dual casing sidetracking process.

关 键 词：双层套管 开窗侧钻 开窗钻头 钻头弯矩 强度校核 

分 类 号：TE921.1[石油与天然气工程—石油机械设备]