封完一体化工艺的研究及应用

Study and application of setting-completion integrated technology

临时封堵工艺是保证井口装置整改期间井控安全的重要屏障,但该工艺存在完井时效低、工具成本高、钻井液污染储层严重等缺陷。针对该问题,研制了二次坐封封隔器,实现了封完一体化工艺。二次坐封封隔器集机械和液压坐封方式于一体,且两种坐封方式相互独立,无论采用哪种方式坐封上提解封后均可启用另一种方式进行第二次坐封。封完一体化工艺充分发挥封隔器二次坐封的优势,将临时封堵和生产任务集中于一趟管柱,确保完井期间井筒完整性、井控安全的同时,大大提高完井时效。封完一体化工艺现场试验成功后,由于其配套工具简单、操作方便、可靠性高,已在塔河油田推广应用。

Temporary plugging technology is an important protection to ensure well control safety during the modification of wellhead device,but it has the defects of low well completion efficiency,high tool cost and serious reservoir contamination by drilling fluid.To this end,this paper developed a two-setting packer and achieved a setting-completion integrated technology.Two-setting packer integrates mechanical setting and hydraulic setting together and both setting modes are independent,so after either of them is unset,the other mode can be started for the second setting.The setting-completion integrated technology can give full play to the advantage of the two-setting packer to conduct temporary plugging and production in one trip,so that well completion efficiency is improved greatly while wellbore integrity and well control safety are ensured in the process of well completion.The setting-completion integrated technology has been successfully tried out on site.And thanks to the simplicity,convenient operation and high reliability of its support tools,this technology has already been popularized and applied in Tahe Oilfield.