Preparation and Application of Superhydrophobic Multifunctional Drag Reducing Agents for Slickwater Fracturing Fluids
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摘要: 目前常规滑溜水压裂液体系普遍具有减阻、携砂、抗盐和耐温等多种功能，但均没有考虑通过改变储层表面润湿性而实现储层保护功能。因此，以丙烯酸、丙烯酰胺、自制材料2-丙烯酰胺基-2-苯基乙烷磺酸和疏水改性剂等为原料，合成了一种超疏水型多功能压裂液用减阻剂SHJZ-1。通过红外光谱仪对合成产物减阻剂结构进行表征，且通过高温高压岩心动态损害评价系统、接触角测量仪、哈克流变仪、闭合管路摩阻测试仪等方法对其性能进行综合评价。结果表明，该减阻剂SHJZ-1溶解时间短，起黏快；当盐水的矿化度达到40 000 mg/L时，0.5%SHJZ-1溶液的减阻率在68%左右；0.15%SHJZ-1溶液在140 ℃下高温老化，减阻率仍能达到70%以上；1.3% SHJZ-1溶液处理后的岩心表现出超疏水效果，岩心接触角为151.21°；该减阻剂溶液对岩心平均渗透率伤害率仅为11.6%。超疏水型多功能压裂液体系在HX-1井顺利进行了现场应用，压裂过程中压裂液性能比较平稳，压后产量与临井相比提升10%以上，实现了提质增效的目的。Abstract: At present, conventional smooth hydraulic fracturing fluid systems generally have various functions such as drag reduction, sand carrying, salt resistance, and temperature resistance, but none of them have considered achieving reservoir protection by changing the surface wettability of the reservoir. Therefore, in this paper, a superhydrophobic multifunctional fracturing fluid drag reducing agent, named SHJZ-1, was synthesized using acrylic acid, acrylamide, self-made material 2-acrylamido-2-phenylethanesulfonic acid, and hydrophobic modifier as raw materials. The structure of the synthesized drag reducing agent was characterized by infrared spectroscopy, and its performance was comprehensively evaluated through various methods such as high-temperature and high-pressure core dynamic damage evaluation system, contact angle measurement instrument, Hack rheometer, and closed pipeline friction tester. The results show that the drag reducing agent SHJZ-1 had a short dissolution time and rapid adhesion. When the salinity of saline water reaches 40000 mg/L, the drag reduction rate of 0.5% SHJZ-1 solution was about 68%. The 0.15% SHJZ-1 solution can still achieve a drag reduction rate of over 70% after high-temperature aging at 140 ℃. Furthermore, the core treated with 1.3% SHJZ-1 solution exhibited superhydrophobic effect, with a core contact angle of 151.21°. Additionally, the average permeability damage rate of the core caused by this drag reducing agent solution was only 11.6%. The super hydrophobic multifunctional smooth hydraulic fracturing fluid system has been successfully applied on site in the HX-1 well. In fracturing engineering, the performance of smooth hydraulic fracturing fluid is relatively stable, and the production after fracturing is increased by more than 10% compared to the adjacent well. The effect is significant, achieving the goal of improving quality and efficiency.
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Key words:
- Slickwater fracturing fluid /
- Drag reducer /
- Superhydrophobic /
- Field application
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表 1 减阻剂溶液对岩心的伤害性能
SHJZ-1/% Ko/mD Kd/mD 渗透率伤害率/% 平均伤害率/% 0.1 1.054 0.946 10.2 11.6 0.3 1.105 0.986 10.8 0.5 1.012 0.896 11.5 0.7 1.089 0.956 12.2 1.0 1.041 0.905 13.1 
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