大位移水平井连续油管排水采气工艺研究

Research on VS deliquification and gas production technology in extended reach horizontal wells

长北区块主力层采用大位移水平井开采,气井初期产量高,完井管柱尺寸较大,开发中后期井筒出现积液,生产不正常,因油套不连通,无循环通道,泡排、气举等排水方法难以实施。针对这一生产难题,采取了在原管柱内下入较小尺寸的连续油管做为生产管柱进行排水采气的方法。重点开展了连续油管下入时机、尺寸优选、下入深度、悬挂方式的研究。截至2021年底,现场已有7口井应用连续油管,工艺设计合理,气井携液能力明显增强,生产稳定,达到了长期的稳产效果,为区块持续推广应用奠定了良好基础,同时也为其它气田同类型气井的排水采气提供了借鉴。

The main layer of Changbei Block is exploited by extended reach horizontal wells. The initial production of the gas well is high and the size of the completion string is large, yet the well bore has fluid accumulation in the middle and late development period, and the production is abnormal. Because the tubing packer is not released and there is no circulation channel, it is difficult to implement foam, gas lift and other deliquification methods. To solve this issue, a method of running velocity string of smaller size into the original string as the production string is adopted. The research on the running time, size optimization, running depth and hanging mode of velocity string was carried out. By the end of 2021,7 VS wells have been applied on site. With rational process design, the liquid carrying capacity of the gas well is significantly enhanced and the production is stable. The long-term stable production effect has been achieved, which has laid a good foundation for the continuous promotion and application of the block, and also provides reference for the deliquification and gas production of similar gas wells in other gas fields.