Study on Desorption and Degradable Lotion Reducer
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摘要: 针对浅层常压页岩气吸附气含量高，难以提高产量实现有效开采及常规聚合物降阻剂难以实现自然降解的问题，通过水相分散聚合合成无油相乳液型降阻剂。通过摩阻仪、磁悬浮天平等对降阻剂及其形成的降阻水体系进行性能评价，实验结果表明，利用该降阻剂配制的0.6%～1.0%降阻水体系实验室降阻率均达到70%以上，现场降阻率84%，解吸附实验结果表明产品解吸率达到85%，远超常规乳液降阻剂产品，具有较高的工程实用性，可以满足施工的要求；使用特性黏数法评价了降阻剂的自然降解能力，其在95 ℃下330 h能够实现自然降解，降解率达到86%，岩心伤害率远低于胍胶体系，IC50测试结果表明该降阻剂在使用浓度下无毒环保。为开发浅层常压页岩气提供了技术借鉴和新的产品思路。Abstract: In view of the high content of adsorbed gas in shallow normal-pressure shale gas, which is difficult to increase production and achieve effective exploitation, and the difficulty of natural degradation of conventional polymer drag reducer, oil-free lotion drag reducer was synthesized through aqueous dispersion polymerization. using friction meters, magnetic levitation balances, etc to evaluate the performance of drag reducr and their formed slick water systems The experimental results show that the laboratory resistance reduction rates of the 0.6% to 1.0% resistance reducing water system prepared with this resistance reducing agent are all above 70%, on site drag reduction rate of 84%. The desorption experiment results show that the desorption rate of the product reaches 85%, which is much higher than the conventional lotion drag reducer product. The natural degradation ability of the drag reducer was evaluated using the intrinsic viscosity method, and it was found that it can achieve natural degradation at 95 ℃ in 330 hours, with a degradation rate of 86%. The core damage rate is much lower than that of the guanidine gum system, and the IC50 test results show that the drag reducer is non-toxic and environmentally friendly at the concentration of use. This provides technical reference and new product ideas for the development of shallow atmospheric shale gas.
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Key words:
- Reducer /
- Dispersed polymerization /
- Slick water /
- AM
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表 1 降阻水对岩心基质伤害实验
降阻水 岩心基质渗透率/nD 伤害率/% 平均值/% 技术指标/% 伤害前 伤害后 1.0%乳液型降阻剂配制的降阻水 13.09 10.97 16.2 16.3 ≤20 
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表 2 低成本体系的性能表征
降阻剂/% η/mPa·s 表面张力/mN·m−1 防膨率/% 清水 1.00 72 0.00 0.5 1.01 65 15.96 0.6 1.36 63 21.28 0.8 1.82 67 31.91 1.0 2.98 59 47.87
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表 3 降阻水体系的性能表征
降阻剂/% 未添加助排
剂的体系
表面张力/
mN·m−1表面张力/
mN·m−1界面张力/
mN·m−1降阻率/% 0.5 65 32 2.2 60 0.6 63 29 0.61 69 0.8 67 25 0.58 71 1.0 59 22 0.51 71
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