螯合酸解堵在渤南低产低效井综合治理中的研究与应用

渤中34-2/4油田水驱开发生产后出现井筒结垢、储层污染、供液不足等问题造成产量大幅度下滑。普通酸化解堵对钡锶垢效果差，酸化后的残酸对海上平台油气水处理流程影响大，严重制约了常规酸化解堵技术的推广应用。对此研发了螯合酸解堵工艺技术，有效解除钙、镁、铁、钡、锶等多种无机垢的伤害，具有强烈抑制金属离子二次沉淀、反应时间长、处理半径大、不易造成二次污染等一系列优点。极大丰富了油井解堵的技术体系，形成了独具特色的第四代解堵技术，为“渤海油田3 000万再稳产十年”宏伟目标提供了强有力的技术保障，渤中34-2/4油田沙河街组不仅有效复产了躺井11口，油井利用率提高了61%，日增油690 m3，同时还创造了低产低效井治理措施有效率100%的佳绩。

Research and Application of Chelating Plugging Removal in Comprehensive Treatment of Low Production and Low Efficiency Wells in Bonan Oilfield

After water drive development and production in Bozhong 34-2/4 Oilfield, problems such as wellbore scaling, reservoir pollution and insufficient fluid supply have occurred, resulting in a significant decline in production. The effect of conventional acidizing plugging removal technology on barium strontium scale is poor, and the residual acid after acidizing has great influence on the oil, gas and water treatment process of offshore platform, which seriously restricts the popularization and application of conventional acidizing and plugging removal technology. In this regard, chelating plugging removal technology is developed, which can effectively remove the damage of calcium, magnesium, iron, barium, strontium and other inorganic scales. It has a series of advantages, such as strong inhibition of secondary precipitation of metal ions, long reaction time, large treatment radius, and not easy to cause secondary pollution. It has greatly enriched the technical system of oil well plugging removal, forming the unique fourth generation plugging removal technology, which provides a strong technical support for the grand goal of "stable production of 30 million in Bohai Oilfields for another 10 years". Shahejie formation of Bozhong 34-2/4 Oilfield not only effectively restored 11 lying wells, increased the utilization rate of oil wells by 61%, increased the daily oil production by 690 cubic meters, but also created a 100% efficiency in the treatment of low production and low efficiency wells .