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为了改造地层,提高油田采收率及采油速度,进行酸化、压裂作业是重要措施之一。 目前,国内自喷油井所用的井口装置,公称压力大都在250公斤/厘米~2以下,仅在少数气井上,装有压力超过350公斤/厘米~2的井口,还没有专门作压裂用的井口控制装置。现在油井酸化压裂作业日益增多,施工井口压力一般在400～600公斤/厘米~2之间,四川、长庆等油田的某些层段,施工井口压力高达700公斤/厘米~2,远远超出原有井口的安全压力,为此,急需提供一种耐高压的压裂井口装置。
In order to transform the strata and improve oil recovery and recovery rate, acidizing and fracturing operations are one of the important measures. At present, wellhead devices used in domestic self-injection wells have a nominal pressure mostly below 250 kg / cm 2 and are well-pressured over 350 kg / cm 2 in only a few gas wells and have not been specially designed for fracturing Wellhead control. At present, the wellhead pressure is generally between 400 and 600 kg / cm ~ 2. In some intervals of the oil fields in Sichuan and Changqing, the pressure at the construction wellhead reaches as high as 700 kg / cm ~ 2, much higher Beyond the safety of the original wellhead pressure, therefore, the urgent need to provide a high pressure fracturing wellhead device.