埕岛油田海上气井排水采气工艺模式

Study on drainage gas pattern for offshore gas wells,Chengdao oilfield

海上气井水淹后,排水采气工艺的选择必须考虑特定生产环境的限制。以埕岛油田埕北古5井为研究对象,根据不同阶段的产液情况,开展有针对性的海上气井排水采气工艺模式研究,提出了适用于海上气井经济有效的排水采气工艺。根据历史生产数据,对常用井筒温度模型和压降模型进行了拟合,筛选出基于多层圆筒壁传热机理的温降模型和修正的Hagedorn-Brown压降模型,以此来计算井筒气液两相沿井筒的温度和压力分布。根据选择的模型,针对埕北古5井对电潜泵排水采气工艺进行了设计,当油管内径为51.8mm,泵挂深度大于2233.5m,选择泵型为Centrilift-GC160系列泵时,水淹气井恢复了生产,并在产液量为152m3/d的情况下保持稳定生产,该井复活后累积产气量为170×104m3。

After the condensate gas wells have been flooded,the choice of drainage gas recovery plan must be considered with the specific production environmental restrictions.In the paper,according to different stages conditions of the liquid production and gas production in a condensate gas well,the approximate drainage gas process pattern for offshore gas wells is studied by the wellbore temperature and pressure drop models.And,an effective feasible and economic drainage gas technology,the electric pump drainage gas recovery scheme,is put forward.Through the implementation of drainage gas recovery scheme,the natural gas output of the well is improved.The drainage gas schemes adopted by the gas well at different production stage can also be referenced for other gas wells nearby.