毛细管测压矫正  

Correction of Capillary Piezometry

作　　者：范志鹏[1] 沈卫凯 侯振[1] 余志 

机构地区：[1]山东电力工程咨询院有限公司,山东济南250000 [2]天然气榆济管道分公司,山东济南250000

出　　处：《自动化仪表》2014年第7期74-76,79,共4页Process Automation Instrumentation

摘　　要：毛细管测压的基本原理是通过井口压力准确推算井底的压力。选用最新的氮气状态方程编写物性计算程序,以保证物性计算的准确性;根据现场测压工艺建立相应的毛细管压力传递数学模型,并采用Runge-Kutta方法求解微分方程,克服了有限差分计算精度较低的缺点;在进行温度补偿的同时,考虑了气体流动对测压结果的影响。模型计算结果表明,所用测压模型可以大大提高毛细管测量的精度。The fundamental of capillary piezametry is accurately calculating the pressure of bottom hole through the wellhead pressure. The program of physical property calculation is written by selecting the latest equation of state for Nitrogen, to ensure the accuracy of physical property calculation. Corresponding transfer mathematical model of capillary pressure is established in accordance with on-site technological process of pressure measurement, and the differential equation is solved by adopting Runge-Kutta method, thus the shortcoming of lower accuracy of finite difference calculation is overcome. When temperature compensation is conducting, the influence of gas flowing on the result of pressure measurement is also considered. The model calculation results demonstrate that the model proposed provides remarkable improvement for accuracy of capillary piezametry.

关 键 词：毛细管测压 温度补偿 气流影响 验证对比 计算精度 

分 类 号：TH812[机械工程—仪器科学与技术]