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随着油气田开发的进一步深入,油水井检修越来越频繁,特别是对高压注水井,常规方法通常是采用高密度压井液压井或是采用放喷溢流方法将井筒压力降低后再进行作业,压井作业会污染地下储层,堵塞地下流体通道,影响流量和注水效果;放喷溢流降压,则会造成无效注水、能源的浪费,还会造成对应井组地层压力整体下降,影响井组产油量,甚至诱发水井吐砂,造成砂埋管柱。新兴的带压冲砂也有投堵、安装、起下管柱时,劳动强度大;投堵时,对于内径复杂、结垢以及有漏点的油管无法实现有效封堵。
With the further development of oil and gas fields, maintenance of oil and gas wells is more and more frequent, especially for high pressure water injection wells. Conventional methods usually use high-density well killing hydraulic wells or discharge-overflow methods to reduce wellbore pressure before operation , Killing operations can pollute underground reservoirs and block underground fluid passage, affecting the flow rate and water injection effect. When discharging and discharging the pressure drop, it will result in invalid water injection and energy waste, as well as overall formation pressure drop of the corresponding well group Well group oil production, and even induced wells spit sand, sand buried pipe column. Emerging pressure with red sand casting also plugging, installation, from the lower column, the labor-intensive; cast block, the diameter of the complex, scaling and leaky tubing can not be effective blockade.