自循环不泄压洗井技术研究与应用

发布时间：2018-05-12 19:14

  本文选题：污水回注 + 注水井　； 参考：《东北石油大学》2017年硕士论文

【摘要】：随着油田开发时间增长,地层能量不断被消耗,导致地层压力不断下降,为了弥补地下亏空,保持地层压力,控制产量递减,提高最终采收率,必须对油田进行注水开发。油田注水以污水回注为主,水中的部分杂质、细菌会附着在地面注水管线、井下管柱上,对注入水造成二次污染,使注水井吸水能力下降,因此,定期对注水井进行洗井是减少污染的重要措施。而常规洗井作业耗费大量水资源,同时产生大量污水,环保压力大;洗井前需要泄压,造成地层压力下降,放压控制不当还会对管柱、套管地层造成伤害。因此,寻找一种更节能、环保和安全的洗井技术成为了很重要的课题。本课题研究以节能减排为重点,结合储层保护技术,分析评价国内外注水井洗井技术状况,开展现场调研,结合油田注水现状筛选出适合油田的自循环不泄压洗井技术。2014年在油田成功推广应用,最大洗井压力和排量分别达到35MPa和30m~3/h,洗井返出液悬浮物含量≤10mg/L,达到洗井效果要求,减少大量洗井用水和废液排放,取得了较好经济和社会效益。
[Abstract]:With the development time of oil field increasing, the formation energy is constantly consumed, which leads to the continuous decrease of formation pressure. In order to make up for the underground deficit, maintain formation pressure, control the decline of production, and improve the final recovery, the oilfield must be developed by water injection. Water injection in oil fields is dominated by wastewater reinjection, and some impurities in the water, bacteria will attach to the surface water injection pipeline and downhole pipe string, which will cause secondary pollution to the injected water and reduce the water absorption capacity of the injection well. Washing water injection wells regularly is an important measure to reduce pollution. The conventional well washing operation consumes a lot of water resources and produces a large amount of sewage at the same time, the pressure of environmental protection is large; before washing wells, the pressure needs to be released, resulting in the decrease of formation pressure, and improper pressure release control will also cause damage to the tubing and casing formation. Therefore, looking for a more energy-saving, environmental-friendly and safe well-washing technology has become a very important issue. This research focuses on energy saving and emission reduction, combined with reservoir protection technology, analyzes and evaluates the status of water injection well washing technology at home and abroad, and carries out field investigation. Combined with the present situation of oilfield water injection, the self-circulation non-pressure washing technology is selected and applied successfully in oil field in 2014. The maximum well washing pressure and displacement are up to 35MPa and 30mg / h, respectively, and the suspended matter content of washing back fluid is 鈮，

本文编号：1879812