Matching optimization of injection-production string with packer for circulating well killing
Keywords:
anti-corrosion packer, circulation valveAbstract
In Tahe oilfield, to address the issues such as difficulties in unsealing the packer because of easy corrosion of gas injection column, inadequate sealing of the single-flow valve during gas injection, low opening pressure, inability of the packer to protect the casing, and the inability to perform circulating well killing after gas channeling, an injection-production string with packer for circulating well killing was developed. The string includes key tools such as annulus pressure-controlled multiple on-off circulation valve, anti-corrosion packers, etc. The annulus pressure-controlled multiple on-off circulation valve can realize multiple switch, which is used for circulating well killing when gas returns. The anti-corrosion packer rubber sleeve is composed of metal mesh end rubber sleeve, PTFE backing ring and middle AFLAS rubber sleeve, which shows good supporting performance, corrosion resistance and sealing performance.
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