摘要
目前国内外气田现场广泛应用的气井临界携液流量模型大多是建立在直井基础之上的,将曳力系数和表面张力取为常数,没有考虑井斜角、曳力系数和表面张力变化对临界携液流量的影响。为了准确判断天然气斜井是否积液,对天然气斜井中的液滴进行受力分析,建立了新的天然气斜井临界携液流量计算模型。模型考虑到曳力系数随雷诺数变化而变化,引入GP模型计算气井中液滴的曳力系数,根据气井温度和压力数据计算出气水界面张力。结合实例,将新模型与其他5个计算模型进行对比,结果表明新模型的计算结果与现场实际数据更加吻合,准确率达95.2%。新模型可以准确计算天然气斜井临界携液流量,可为天然气斜井积液判断和合理配产提供理论支撑,对于气田合理生产具有指导作用。
Most of the models for calculating the critical liquid-carrying flow rate widely used in gas fields at home and abroad are based on vertical wells,and the drag coefficient and interfacial tension are assumed as the constants without considering the effects of the deviation angle,drag coefficient and interfacial tension on the critical flow rate.In order to accurately judge the liquid loading in directional gas wells,the force analysis of the liquid droplet in directional well is analyzed and a new model for calculating the critical liquid-carrying flow rate in directional gas wells is established.Considering the variations of the drag coefficient with Reynolds numbers,the drag coefficient in the liquid droplet in the gas well is calculated by the introduced GP model,and the gas-water interfacial tension is calculated based on the gas-well temperature and pressure.The new model is compared with the other five models by integrating with the actual case.The results show that the calculated results by the new model are more coincident with the actual data in the field with the accuracy is up to 95.2%.The new model can accurately calculate the critical liquid-carrying flow rate of directional gas wells,which provides theoretical support for the liquid-loading judgement and reasonable production allocation for gas wells,and has a guidance role for for the reasonable production of the gas field.
作者
赫英旭
郭春秋
张立侠
王凤辉
单云鹏
张奔
HE Yingxu;GUO Chunqiu;ZHANG Lixia;WANG Fenghui;SHAN Yunpeng;ZHANG Ben(PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;Offshore Oil Engineering Co Ltd, Tianjin 300451, China;Xi’an Shiyou University, Xi’an 710065,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2021年第4期87-93,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
国家科技重大专项“土库曼斯坦阿姆河右岸裂缝孔隙(洞)型碳酸盐岩气藏高效开发关键技术研究与应用”(2017ZX05030-003)。
关键词
临界携液流量
斜井
流动条件
曳力系数
界面张力
critical liquid-carrying flow rate
directional well
flow condition
drag coefficient
interfacial tension
作者简介
第一作者:赫英旭,男,1994年生,硕士,从事油气田开发工程研究,E-mail:heyingxu510@163.com。
