渤海油田注水井解堵增注技术

为解决渤海油田注水困难的问题,在对注水井注水动态和堵塞物资料进行分析的基础上,得到了注水井的系列堵塞机理,并研制出相应的解堵剂,即BHJ系列解堵剂。分别对有机解堵剂溶解沥青、石蜡能力、洗油能力、破乳能力以及无机解堵剂溶蚀充填砂、溶蚀岩样、溶解无机盐垢、溶解铁锈、静态挂片腐蚀性、难溶垢转化率等进行了室内评价试验,结果表明,该解堵剂对堵塞物溶蚀率高达90%以上。在渤海油田进行现场施工12井次,措施井视吸水指数大幅度上升,措施成功率100%。实践表明,BHJ系列解堵剂具有解堵且不伤害地层骨架的优点,同时具有适用范围广、解堵率高、渗透率改善效果好等特点,可大面积推广。

Plugging Removal and Injection Enhancement Technology for the Water Injection Wells in Bohai Oilfield

To solve the problem of difficult water injection in Bohai oilfield, a study was carried out on the plugging mechanism of water injection wells, and BHJ series plugging removal agents were developed based on the study. Laboratory tests were conducted on the performances of the series agents, e.g., of the organic plugging removal agent, its dissolving ability to asphalt and wax, its crude oil cleaning and gel-breaking ability; of the inorganic plugging removal agent, its dissolution to packing sand and core samples, its dissolution to inorganic scale and iron rusts, its iron ions stability, static slice corrosion, and tough scale conversion rate. Tests showed that BHJ series agents achieved a plugging dissolution rate as high as 90% and over. The series products have been used for 12 times in Bohai Oilfield, and the water sucking index of the operated wells went up remarkably, with a 100% operation success rate achieved. The field using proved their advantages such as high plugging removal efficiency, free of formation damage, wide application range, good permeability recovery, etc.