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为了提高树脂砂控制支撑剂回流的有效率,开展了树脂砂控制支撑剂回流研究。室内实验包括树脂砂回流影响因素、树脂砂回流实验和树脂砂导流能力实验。其中树脂砂回流影响因素涉及到树脂砂固化动力学、流体与树脂砂的配伍性、施工条件和地层条件以及油气井日常作业引起的应力循环对树脂砂性能的影响。影响因素实验结果表明,树脂砂在固化2.5h时其抗压强度即可达到1.3MPa,可满足1MPa的控制支撑剂回流的要求。树脂砂抗压强度随着流体pH值的增加而增大,同时随着树脂损失率的增大而减小,树脂砂抗压强度和树脂损失率之间有良好的关联性;压裂液类型对树脂砂的性能有一定的影响;随着地层水矿化度的增加,抗压强度逐渐减小,但变化幅度不大。泵注时的剪切作用可使树脂砂抗压强度减小,树脂损失率增加。树脂砂强度随着固化温度和固化应力的增加而增大,随应力循环次数的增加而降低。在单应力和多应力回流测试中,树脂砂均未出现回流现象。与不固化时相比,固化状态下的树脂砂导流能力在高应力下有较大的提高,对井产能的影响比较小。现场试验表明,通过采用强碱性携砂液、优化泵注参数、增强树脂砂性能和减小油气井作业引起的井底压力的变化幅度和次数,可提高树脂砂防砂的成功率。
In order to improve the resin sand control proppant reflux efficiency, carried out resin sand control proppant reflux study. Laboratory experiments include resin sand backflow influencing factors, resin sand backflow experiment and resin sand conductivity experiment. Among them, the influence factors of resin sand back flow include the curing kinetics of resin sand, the compatibility of fluid with resin sand, the construction conditions and formation conditions and the stress cycling caused by the daily operation of oil and gas wells. Influencing factors The experimental results show that the compressive strength of resin sand can reach 1.3MPa when it is cured for 2.5h, which can meet the requirement of controlling proppant backflow of 1MPa. The compressive strength of resin sand increases with the increase of fluid pH, and decreases with the increase of resin loss rate. There is a good correlation between compressive strength of resin sand and resin loss rate. The fracturing fluid type The resin sand has a certain impact on the performance; with the formation of water salinity increases, the compressive strength decreases, but the rate of change is not. Pumping shear effect can make resin sand compressive strength decreases, the resin loss rate increases. The resin sand strength increases with the curing temperature and the curing stress, and decreases with the increase of the stress cycles. In single-stress and multi-stress reflow tests, resin sand showed no reflow phenomenon. Compared with the non-curing, the resin sand flow conductivity in the cured state is greatly enhanced under high stress, and the impact on well productivity is relatively small. Field tests show that the success rate of sand control by resin sand can be improved by adopting strong alkaline carrier fluid, optimizing pumping parameters, enhancing resin sand performance and reducing the variation range and frequency of bottom hole pressure caused by well operation.