低渗气藏气井堵塞停产分析及解堵技术应用——以鄂尔多斯盆地长庆气区为例  

Causes of gas well plugging and application of plugging removal technology in low permeability gas reservoir:A case study of the Changqing gas field in Ordos Basin

作　　者：张鹏[1] 杨巧云 苏建辉[1] ZHANG Peng;YANG Qiaoyun;SU Jianhui(The First Gas Production Plant,PetroChina Changqing Oilfield Company,Jingbian,Shaanxi,718500,China;Xi an Changqing Tongxin Petroleum Technology Co.,Ltd.,Xi an,Shaanxi,710018,China)

机构地区：[1]中国石油长庆油田分公司第一采气厂,陕西靖边718500 [2]西安长庆同欣石油科技有限公司,陕西西安710018

出　　处：《天然气与石油》2023年第6期98-109,共12页Natural Gas and Oil

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“致密气开发效果评价与开发对策研究”(2021DJ2106)。

摘　　要：鄂尔多斯盆地长庆气区低渗透岩性气藏进入开发中后期,气井因井下堵塞造成产量下降,甚至停产。针对这一问题,根据堵塞原因分析,将气井堵塞分为井筒及近井储层腐蚀结垢、井筒出砂积砂和近井储层水锁损害三大类,并开展了堵塞机理和堵塞原因判识研究。在此基础上提出了井筒除垢、连续油管冲砂,近井储层深度酸化和解水锁为主体的差异化解堵技术对策,长庆气区现场应用取得了良好效果,2018—2022年复产气井752口,单井平均年增气量140×10^(4)m^(3),年增气量超过10.0×10^(8)m^(3),产出投入比超过6.0,解堵效果显著、经济效益突出,有效解决了气井因堵塞而停产或低产的难题,为长庆气区气井解堵技术体系的完善和其它同类气藏的解堵复产提供了有效的技术支撑和保障。The Changing gas field,a typical low-permeability lithological gas reservoir,is characterized by strong heterogeneity and poor physical properties.As the development of the gas field has entered its middle and late stages,the gas wells have been witnessing decreased production or even shutdown due to plugging in the wellbore and reservoir.In response to this issue,extensive research on the mechanisms and causes of the plugging was undertaken,leading to the identification of three types of gas well plugging:corrosion and scaling,sand production,and water lock damage.Consequently,key technical countermeasures were devised,including in-wellbore chemical descaling and coiled tubing sand flushing,deep acidizing,and water lock release in the near-well reservoir.These measures have been applied on a field scale,with 752 revitalized gas wells from 2018 to 2022 resulting in an average annual increase of more than 1.4 million m^(3)and a total annual increase of over 1 billion m^(3),effectively tackling the issue of decreased production or shutdown caused by plugging.The output-to-input ratio exceeds 6.0.This offers effective technical support and assurance for the improvement of the plugging removal technology system in the Changqing gas field and the plugging removal and resumption of production in other similar gas reservoirs.

关 键 词：低渗透气藏 气井堵塞 停产原因 解堵技术 应用研究 

分 类 号：TE37[石油与天然气工程—油气田开发工程]