高压集输气井井筒积液量与流压计算方法  

Calculation Method for Wellbore Liquid Volume and Bottom-hole Flowing Pressure of High-pressure Gathering and Transmission Natural Gas Wells

作　　者：王锦昌 赵润冬 WANG Jinchang;ZHAO Rundong(Research Institute of Petroleum Engineering Technology,Sinopec North China Oil and Gas Company,Zhengzhou,Henan 450006,China)

机构地区：[1]中石化华北油气分公司石油工程技术研究院,河南郑州450006

出　　处：《西安石油大学学报（自然科学版）》2024年第3期50-57,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石化华北油气分公司“东胜气田钻采工艺关键技术研究”项目(KJGLB-2022-13)。

摘　　要：针对采用高压集输工艺气水同出的天然气井,为准确计算其井筒积液量及井底流压,以指导泡排工艺的实施,建立了一种井筒积液量与流压计算方法。通过简化油管与环空内气水两相分布,并以套压折算流压等于油压折算流压为基本原则,推导出包含油管等效液面处压力p_(1)、环空等效液面处压力p_(2)、环空与油管等效液柱高度比值k等3个关键参数的计算方程,并结合动态监测数据,给出了3个关键参数的求解方法,从而通过迭代方式计算得出井筒积液量与井底流压。经45口气井实测数据验证,流压计算平均误差4.4%,积液量计算平均误差14.8%。同时,该方法主要利用生产数据和少量流压测试数据进行并行迭代计算,具有成本低、计算速度快的优点。In order to accurately calculate the wellbore fluid volume and bottom-hole flowing pressure of water-producing natural gas wells using high-pressure gathering and transmission technology to guide the implementation of foam drainage technology,a calculation method for wellbore fluid volume and bottom-hole flowing pressure was established.By simplifying the gas-water distribution in tubing and annulus,and based on the principle that the flowing pressure calculated by casing pressure is equal to the flowing pressure calculated by tubing pressure,a calculation equation was derived that includes three key parameters:pressure p_(1)at the equivalent liquid level of the tubing,pressure p_(2)at the equivalent liquid level of the annulus,and the ratio of the equivalent liquid column heights of the annulus to the tubing,k.Based on dynamic monitoring data,a solution method for three key parameters was provided to iteratively calculate the wellbore fluid volume and bottomhole flowing pressure.Verified by actual data from 45 gas wells,the average error of the method in flowing pressure calculation is 4.4%,and the average error in liquid volume calculation is 14.8%.Meanwhile,this method mainly utilizes production data and a small amount of flowing pressure test data for parallel iterative calculation,which has the advantages of low cost and fast calculation speed.

关 键 词：高压集输气井 井筒积液量 井底流压 

分 类 号：TE37[石油与天然气工程—油气田开发工程]