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140×104 m3,年增气量超过10.0×108 m3,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 m3 and a total annual increase of over 1 billion m3, 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.