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哈南油田属低渗透复杂断块油田,储层物性差,油层总厚度虽然大,但储层多而且单层薄。由于粘土运移及蜡和胶质沥青质垢的生成,近年来油井产量逐年下降。因此决定在解除地层有机伤害和无机伤害的同时提高地层基质渗透率,采用有机解堵剂和深度基质酸化相结合的方法,提高油井产量。在室内对酸液、添加剂进行了优选,确定采用有机酸和盐酸为前置酸,有机酸、盐酸和氢氟酸为主体酸,有机酸和盐酸为后置酸;选择由分散剂、有机溶剂和破乳剂等组成的FAX-1油垢清洗剂,能将垢(除无机质外)完全、快速地溶解并不产生乳状液;采用廊坊分院压裂酸化中心的FAH缓蚀剂;开发了高性能的FAD综合添加剂。前置酸、后置酸和主体酸的性能评价结果表明,在80℃下静置48 h后,无异常变化;动态腐蚀速率为6.23 g/m2·h(80℃);表面张力为25.96 mN/m;20 min内完全破乳。先后进行了3口井的酸化,酸化后表皮系数降低,产油量明显提高。
Hannan Oilfield is a low permeability complex fault block oilfield, poor reservoir properties, although the total thickness of the reservoir, but the reservoir more and single thin. In recent years, the production of oil wells has declined year by year due to the migration of clay and the formation of waxy and gummy asphalt scale. Therefore, it was decided to improve the formation matrix permeability while removing organic damage and inorganic damage from the formation. The combination of organic plugging agent and deep matrix acidification should be used to improve oil well production. The acid and additives were optimized indoors. The organic acid and hydrochloric acid were used as the pre-acid, organic acid, hydrochloric acid and hydrofluoric acid as the main acid, organic acid and hydrochloric acid as the post-acid. The dispersant, organic solvent And demulsifier, etc. It can dissolve scale (except inorganic matter) completely and quickly and does not produce emulsion. It adopts FAH corrosion inhibitor of Langfang Branch Fracturing and Acidifying Center, and has developed high performance FAD synthetic additives. The performance evaluation of the pre-acid, post-acid and the main acid showed that there was no abnormal change after standing at 80 ℃ for 48 h, the dynamic corrosion rate was 6.23 g / m 2 · h (80 ℃) and the surface tension was 25.96 mN / m; Complete demulsification within 20 min. Successively carried out the acidification of three wells, the acidification of the epidermal coefficient decreased, oil production increased significantly.