摘要
积液是气井开采过程中的一个重要难题,准确预测临界携液流量对排水采气工艺技术的实施至关重要。本文利用现场井筒测压数据,优选出了适用于深层页岩气井的井筒压力模型,并基于优选出的压力模型,利用液滴模型、液膜模型和考虑角度变化的携液模型对某页岩气水平井进行了积液诊断。7种井筒压力模型结果表明:No Slip Assumption压力模型计算误差最小:2.47%,其次为Gray模型。8种积液模型判断结果显示:不同的积液模型在判断同一口气井时,结果相差较大,因此不能利用单一的液滴模型或液膜模型进行积液判断,Belfroid和Wang模型计算表明:随着倾斜角度的增大,气体临界表观流速呈现出先增大后减小的趋势,倾斜角度20~40°时临界携液流速最大,最易产生积液;相对于水平井中的垂直段,水平段更易产生积液。
Liquid loading is an important problem in the process of gas well exploitation.Accurate prediction of critical liquid carrying flow velocity is very important for the implementation of drainage gas production technology.In this paper,the pressure model suitable for deep shale gas wells is optimized by using the field pressure measurement data.Based on the optimized pressure model,the liquid drop model,liquid film model and liquid loading model considering the angle change are used to diagnose the liquid accumulation of a shale gas horizontal well.The results of seven wellbore pressure models show that the calculation error of No slip assumption pressure model is the smallest,and the mean absolute error is 2.47%,followed by Gray model.The judgment results of 8 kinds of effusion models show that when different liquid loading models were used to judge the same gas well,the results are quite different.If only a single droplet model or liquid film model was used to judge the liquid loading,the results may be inaccurate.The calculation results of Belfroid and Wang models shows that with the increase of the inclination angle,the critical apparent velocity of the gas increases and then decreases.When the inclination angle is between 20 to 40°,the critical liquid carrying velocity is the largest,and the liquid loading is most likely to occur.Compared with the vertical section in the horizontal well,the horizontal section is more prone to produce fluid accumulation.
作者
张谦
石书强
王益民
Zhang Qian;Shi Shuqiang;Wang Yimin(Research Institute of Exploration and Development,Jianghan Oilfield Branch Company,Sinopec,Hubei,430223;School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing,401331)
出处
《当代化工研究》
2022年第11期64-66,共3页
Modern Chemical Research
关键词
积液模型
倾斜角度
压力
水平井
liquid loading model
angle
pressure
horizontal wells