井内连续变化的地层温度会对智能完井系统液压控制管线内流体流动造成较大的影响。为了解决现有的连续方程、运动方程不能精确求解变温环境下液压管线内流体流动特性的问题，根据能量方程的定义，分析流体微元以及所采用的 32 号液压油特性，推导出一个特定形式的能量方程，再联立现有的连续方程、运动方程，得到一个新方程组，并利用特征线法(method of characteristics，MOC)结合MATLAB软件对新方程组进行计算求解。若干恒温条件与 2 种连续变温条件下的仿真结果显示，新方程组均比旧方程组求解精度高，验证了所推导的能量方程的合理性与准确性，证明其能用于恒温与变温环境下液压管线内流体流动问题的计算求解，进而推广至智能完井系统液压控制管线等问题的计算求解，对智能完井井下流量控制阀开启状态进行判断。研究结果可为智能完井系统液压控制等研究提供参考。
Analysis of hydraulic control pipeline characteristics of intelligent completion system
The continuously changing formation temperature in the well will have a great influence on the fluid flow in the hydraulic control pipeline of the intelligent completion system,but the existing continuous equation and motion equations cannot solve the fluid flow in the hydraulic pipeline under the variable temperature environment.Aiming to resolve this problem,according to the definition of the energy equation,the fluid infinitesimal and the characteristics of No.32 hydraulic oil were analyzed,a specific form of the energy equation was deduced,and then the existing continuous equation and motion equation were established.And then,a new set of equations was obtained,and the new set of equations was solved by using the method of characteristics(MOC)combined with MATLAB software.The simulation results under some constant temperature conditions and two continuous variable tempe-rature conditions show that the new set of equations is more accurate than the old set of equations,which verifies the rationality and accuracy of the energy equation deduced in this paper.It shows that it can be used to calculate and solve fluid flow problems in hydraulic pipelines under constant temperature and variable temperature environments.And it can be extended to calculate and solve the hydraulic control pipeline of intelligent completion system,and judge the open state of downhole flow control valve of intelligent completion.The research results in this paper can provide a reference for hy-draulic control of intelligent completion systems.
intelligent completion systemtransient flowmethod of characteristicsgeothermal gradient
国家科技期刊平台
NSTL
万方数据
