摘要
连续波脉冲发生器是现代油气钻井系统的核心部件之一,脉冲发生器主要部件是其中的定子和转子,定、转子的相对运动会导致钻井液的复杂变化。定转子附近机构复杂,钻井液流速快,有明显的湍流现象,而且实际钻井液主要是由水和细砂组成的多相流混合物。着重考虑多相流对转子水动力特性的影响,使用CFD数值仿真方法比较不同情况下,考虑多相流因素和纯水时的转子水动力特性。研究表明:转子水动力转矩基本不受多相流因素的影响,与来流速度、定转子间隙、相对旋转角度关系密切。研究还发现,流道内固相物质在定转子衔接处有积聚的特性。
Oscillating mud pulser is one of integral part of MWD / LWD,which consists of stator and rotator. Relative motion between stator and rotator would lead to complex transformation of drilling fluid which mainly contains water and fine sand.Mechanisms beside stator and rotator are complex,and the flow rate of the drilling fluid is so fast that phenomenon of turbulence is clear. This paper focuses on the effect of multiphase flow on the hydraulic characteristics of the rotor. Comparisons are also made about the hydraulic characteristics of the rotor under different conditions of multiphase flow and pure water through CDF numerical simulation. The study shows that the hydraulic torque barely relates to multiphase flow,but the hydraulic torque is closely related to the inflow speed,the gap between stator and rotor,and the relative rotational angle. It is also found that solid phase accumulates around the joint of the rotor.
出处
《现代机械》
2015年第6期35-41,共7页
Modern Machinery
关键词
多相流
水力转矩
泥浆脉冲发生器
数值模拟
multiphase flow
hydraulic torque
mud pulser
numerical simulation
