油田开采中耐温可降解暂堵剂的研发和性能研究
发布时间：2018-10-19 16:47
【摘要】：随着社会的不断发展和进步,人们对能源的需求不断的加大,尤其是油气资源,这促进了油气行业的大力发展。各国油田基本都已无自然产能而采用注水开发,随着油田的不断注水,导致了油藏含水量过高,油井出水严重,横纵向的均质性较差,采油效率低等一系列问题。为了解决以上问题,研究者们不断的开发各种堵剂,改变油藏内部的不均质性,封堵高渗层等保证采油量。但是随着开采的力度的不断加大,浅部油藏已经基本开发完全,开采的深度正在逐步加深,相应的地层温度、压力、矿化度等也随之升高,而目前市场上存在的暂堵剂耐盐性可以满足要求,但耐温都在135℃以下,注入深部地层后易发生降解或溶解,不能有效封堵。暂堵剂的开发还应与环境保护结合,如果暂堵剂在发挥封堵性能后残留在地层,那么将会污染地层。因此,研制一种耐盐、耐剪切性较好,有可以耐高温,在一定条件下又可以降解的暂堵剂,对于油田的深部开采,进一步提高采收率是有重要的实践意义的。本文通过对前人资料的归纳总结,选择使用水溶液聚合法,通过改变单体和配比的方式合成冻胶。主要通过耐温性实验,不断的完善改进暂堵剂的粘弹性、耐温性和降解性。对合成的暂堵剂还开展溶解性、膨胀性、配伍性、携带型、封堵性、伤害性等性能评价,探讨了由不同单体及不同比例合成的暂堵剂的性能特点,最终确定了适合不同温压地层使用的暂堵剂系列的配方。研制的暂堵剂系列产品,达到如下的技术指标:(1)耐温110~180℃;(2)可在残酸或清水中膨胀20~30倍不等;(3)48h内降解率达到95%以上;(4)在酸液、清水、压裂液中悬浮性均较好,易携带;(5)降解液与残酸配伍性良好,对孔喉和小于300微米的裂缝具有较强的封堵性,对岩心的恢复能力大于88%;(6)产品工艺简单,经济技术可行。
[Abstract]:With the development and progress of society, the demand for energy is increasing, especially the oil and gas resources, which promote the development of oil and gas industry. With the continuous injection of oil fields, the water content of the reservoir is too high, the well effluent is serious, the horizontal and vertical homogeneity is poor, the oil recovery efficiency is low, and so on. In order to solve the above problems, the researchers constantly develop a variety of plugging agents to change the internal heterogeneity of the reservoir and seal the high permeability layer to ensure oil production. However, with the increasing intensity of exploitation, shallow reservoirs have been basically developed completely, the depth of exploitation is gradually deepening, and the corresponding formation temperature, pressure, salinity, etc., are also rising. However, the salt tolerance of temporary plugging agents in the present market can meet the requirements, but the temperature tolerance is below 135 鈩，
本文编号：2281740
[Abstract]:With the development and progress of society, the demand for energy is increasing, especially the oil and gas resources, which promote the development of oil and gas industry. With the continuous injection of oil fields, the water content of the reservoir is too high, the well effluent is serious, the horizontal and vertical homogeneity is poor, the oil recovery efficiency is low, and so on. In order to solve the above problems, the researchers constantly develop a variety of plugging agents to change the internal heterogeneity of the reservoir and seal the high permeability layer to ensure oil production. However, with the increasing intensity of exploitation, shallow reservoirs have been basically developed completely, the depth of exploitation is gradually deepening, and the corresponding formation temperature, pressure, salinity, etc., are also rising. However, the salt tolerance of temporary plugging agents in the present market can meet the requirements, but the temperature tolerance is below 135 鈩，
本文编号：2281740
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2281740.html
