摘要
泥浆脉冲传输是一种使用最为广泛的无线随钻测量方式,为了改善泥浆脉冲发生器工作性能、提高信号强度和传输距离,需要对旋转阀进行优化。根据流体力学中节流口压力与流量关系式,推导出正脉冲压力波信号的转阀形状曲线方程,并根据方程对定子、转子形状进行了优化。利用计算流体力学(CFD)方法,对转阀的流场特性进行三维仿真分析,并通过实验验证了旋转阀随钻测井仪的传输特性。研究结果表明:转子叶片轮廓设计成极坐标曲线时正脉冲压力波信号稳定;采用曲线阀口可以使水力转矩变化平缓;为了解决冲蚀问题,转阀设计中考虑溢流功能,同时设计转子耐磨套。
Mud pulse transmission is a kind of the most widely used method of wireless measurement while drilling. In order to improve the performance of mud positive pulse generator and to accelerate the generation rate of the pulse signal and its transmission distance in the Logging While Drilling（ LWD） system,the stator and the rotor blade should be rationally designed. The equations of valve shape curve to generate desired pressure valve signal can be derived from orifice pressure-flow relationship. Based on the optimized equation,the design of the stator and rotor shape can be rectified. With the help of computational fluid dynamics（ CFD） technique,the threedimensional flow fields simulation analysis has been conducted on the characteristics of the rotary valve coverage. Then the transmission characteristics of the rotary valve in LWD system are validated experimentally. The results show that the rotor blade profile can be designed as a polar coordinate curve,which can be used to get stable positive pressure wave signal of positive pulse; The hydraulic torque can be changed mildly using the curved orifice; The overflow valve and wear sleeve are designed to solve the problem of erosion.
出处
《机械科学与技术》
CSCD
北大核心
2014年第5期688-692,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
"十二五"国家科技重大专项基金项目(2011ZX05020-002)
国家自然科学基金项目(51275409)
陕西省科技计划项目(2012JQ7009)资助
关键词
随钻测量
计算流体力学
设计
转子
流场
calculations
computational fluid dynamics
computer simulation
design
experiments
flow fields
measurement while drilling
mesh generation
pressure
rotors
schematic diagrams
transmissions
turbulence models
valves（mechanical）
