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华北油田在屏蔽暂堵技术基础上开发出了适用于砂岩油藏完井作业的快速封堵保护油层钻井液技术。该项技术的特点是封堵带薄且致密,渗透率趋于0,封堵深度小于1cm,在一定负压差下不能反排解堵,易被射穿,在开采时通过射孔实现储层与井筒连通良好的目标。快速封堵保护油层钻井液技术可根据不同地区砂岩储层的特点和潜在损害因素,有针对性地研制油层保护剂,而且不用考虑油层保护材料的油溶性、酸溶性或水溶性,凡是能够起到快速封堵效果的材料,也包括钻井液中的处理剂均可考虑作为封堵材料。由于钻井液处理剂的引入,使快速封堵型油层保护剂既与现场钻井液有良好的配伍性,又同时发挥了钻井液处理剂的功效,走出了单一采用粒径匹配的固相颗粒进行封堵的思路,使封堵层更加致密,油层保护效果更佳。该项技术在二连油田231口开发井中进行了应用,完善井层百分率由37%提高到85%以上,储层严重损害百分率由36%降低到3.75%。
Huabei Oilfield has developed a rapid plugging protection reservoir drilling fluid technology suitable for completion of sandstone reservoirs on the basis of shielding temporary plugging technology. The technology is characterized by sealing with a thin and dense, the permeability tends to 0, the plugging depth of less than 1cm, negative pressure difference in a certain antipolysis unplug, easy to shoot through the hole in the production of perforation reservoir Well connected with wellbore. Rapid plugging and protection of reservoir drilling fluid technology can be based on the characteristics of sandstone reservoirs in different regions and potential damage factors, targeted development of reservoir protection agent, and without considering the reservoir protection of oil-soluble materials, acid-soluble or water-soluble, Materials that have a fast plugging effect, but also treating agents in drilling fluids, can be considered as plugging materials. Due to the introduction of drilling fluid treatment agent, the quick plugging type reservoir protection agent not only has good compatibility with on-site drilling fluid, but also exerts the effectiveness of drilling fluid treatment agent and goes out of the way of using single solid particle with matching particle size Plugging ideas, so that the plugging layer more dense, better protection of the reservoir. The technology has been applied in 231 wells in Erlian Oilfield. The percentage of well completion improved from 37% to over 85%, and the percentage of serious damage from reservoir decreased from 36% to 3.75%.