气井零液流量流动模拟实验及模型应用研究  

Experimental and Modeling Investigation on Zero Net-liquid Flow in Gas Wells

作　　者：罗程程[1,2] 靳悦 刘永辉 杨杰友[3] 杨建英 王强 叶长青 LUO Chengcheng;JIN Yue;LIU Yonghui;YANG Jieyou;YANG Jianying;WANG Qiang;YE Changqing(Southwest Petroleum University,Chengdu,Sichuan 610056,China;State Key Laboratory for Oil&Gas Reservoir Geology and Exploitation,Chengdu,Sichuan 610056,China;The Fifth Oil Production Plant of ChangQing Oilfield,Dingbian,Shaanxi 718600,China;Sichuan Changning Natural Gas Development Co.,Ltd.,Chengdu,Sichuan 610056,China;Gas Field Development and Management Department,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610051,China;Engineering Technology Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan 610017,China)

机构地区：[1]西南石油大学 [2]油气藏地质及开发工程国家重点实验室 [3]中国石油长庆油田采油五厂 [4]四川长宁天然气开发有限责任公司 [5]中国石油西南油气田分公司气田开发管理部 [6]中国石油西南油气田分公司工程技术研究院

出　　处：《钻采工艺》2022年第4期81-86,共6页Drilling & Production Technology

基　　金：中国石油—西南石油大学创新联合体科技合作项目“川南深层与昭通中浅层海相页岩气规模效益开发关键技术研究”(编号:2020CX020203)。

摘　　要：气井零液流量流动是积液气井中一种特殊的流动现象,准确认识零液流量流动规律对于揭示气井积液机理、判断气井积液程度、指导积液气井气举和泡排等排采工艺设计及优化至关重要,但目前缺乏相关深入全面的实验研究和理论模型。为此,文章基于所搭建可视化实验装置开展了零液流量流动实验,建立了零液流量持液率模型和气井井筒积液高度预测方法。结果表明:零液流量流动时存在泡状流、段塞流和搅动流三种流型;油管尺寸一定时,静液柱高度对持液率无影响,其值仅与气流速相关;新建零液流量流动持液率模型与实验误差为仅为3.5%,与实际气井误差为8.7%,能够准确地运用于实际积液气井压力预测。新模型及积液高度预测方法可为现场气井积液程度判断提供理论依据,为实施排采工艺的积液气井提供重要指导作用。Zero net-fluid flow is a kind of special flow phenomenon in liquid-loading gas well. Accurately understanding the behavior of zero net-fluid flow is vital to reveal the mechanism of liquid-loading and judge the severity of liquid-loading, and provide guideline to design and optimize dewatering gas production technologies such as gas lifting and foaming in liquid-loading gas wells. However, there are no comprehensive experimental and modeling studies in this area. To this end, based on the visual experimental setup, this paper conducted zero net-liquid flow experimental investigation, then established a model of zero net-fluid-flow liquid holdup rates and proposed a method to predict the height of accumulated liquid column in gas well. The results show that three flow pattern, namely, bubble flow, slug flow and churn flow were observed in zero net-fluid flow. At a constant pipe size, the height of the static liquid column has no effect on liquid holdup, which is only related to gas velocity. The proposed zero net-fluid-flow liquid holdup model has an error of 3.5% against the experimental data and 8.7% against gas well, showing a good application in pressure prediction of liquid-loading gas wells. The proposed new model and prediction method can provide theoretical basis for judging the degree of liquid-loading in gas wells and important guidance for the implementing of dewatering gas production technologies in liquid-loading gas wells.

关 键 词：零液流量 持液率模型 积液高度 排采工艺优化 两相流 流动模拟实验 

分 类 号：TE37[石油与天然气工程—油气田开发工程]