水平井分段注水管柱技术探讨

Towards Zonal Water Injection String Technology for Horizontal Wells

低渗透、薄层油藏由于天然能量不足,存在地层压力下降快、启动压力和注水压力高等问题,直井注水技术在其开发过程中逐渐暴露出一些不足。水平井相对直井注水具有注水压力低、注入量大、波及效率高等优点,但水平井笼统注水时,水平段上渗透率的差异会导致高渗段超注与低渗段欠注。针对上述问题,江汉油田提出了一种针对水平井的分段注水管柱,可实现水平井有效分段注水,保证注入水均匀推进,达到更好的注水效果。

The shortage of natural energy in thin reservoirs with low permeability would lead to taster decreasing formation pressure and higher starting pressure and water injection pressure. Compared to vertical well injection tech nology, horizontal well injection technology has advantages of low injection pressure, large injection rate and high sweep efficiency. However, the permeability difference of horizontal sections would result in overinjection at high osmosis section and underpressure injection at low osmosis section if general injection into horizontal wells were done. The zonal water injection string technology for horizontal wells, accordingly, comes up. This technology contributes to effective zonal injection and even flow of injected water, thus achieving a better flood result.