Preparation and Properties of Viscosification and Drainage Integrated Polymer Dispersion
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摘要: 速溶耐盐聚合物是高矿化度地层水和返排水有效利用的关键产品，实现增黏助排一体化是稠化剂研发的主要方向。设计合成了一种弱疏水缔合聚合物，优化形成了增黏助排一体化分散液，并对压裂液的综合性能进行了评价研究。该聚合物分散液可满足194 557.93 mg/L的超高矿化水在线配制要求，在分散液用量0.1%～1.2%情况下可以实现黏度2～106 mPa·s可调；分散液用量大于0.4 %以后压裂液破胶液表面张力小于27 mN/m；90 ℃下，剪切1h后增黏助排一体化压裂液黏度大于50 mPa·s；1.0%聚合物分散液在80 ℃下破胶2 h，破胶液黏度为4 mPa·s左右；在聚合物分散液用量为0.1%时，压裂液减阻率大于65%。该聚合物分散液可以满足超高矿化度地层水及返排液配液要求，可以实现在线变黏及助排一体化，大幅度降低压裂液成本，简化现场配液流程，具有广泛应用前景。Abstract: Rapid dissolution and salt-tolerance polymers are the key products for effective utilization of highly mineralized formation water and backflow water. The integration of viscosification and drainage is the main research direction of thickeners. A weak hydrophobic association polymer was designed and synthesized, and an integrated dispersing fluid with the properties of viscosification and drainage was optimized. The overall performance of fracturing fluid was evaluated. The polymer dispersion can meet the online preparation requirements using 194 557.93 mg/L ultra-high mineralized water, and the viscosity can be adjusted from 2 to 106 mPa·s when the amount of salt-resistant thickener was 0.1-1.2%. The surface tension of breaking fluid was less than 27 mN/m when the amount of dispersion was greater than 0.4%.At 90 ℃, under shearing for 1h, the viscosity of the integrated fracturing fluid was greater than 50 mPa·s. The viscosity of 1.0% polymer dispersion was about 4 mPa·s under 80 ℃ water bath for 2 h. When the amount of polymer dispersion was 0.1%, the drag reduction rate of fracturing fluid was greater than 65%. The polymer dispersion can meet the requirements of mixing ultra-high salinity formation water and flowback fluid, realize the integration of online viscosity change and drainage, greatly reduce the cost of fracturing fluid, and simplify the on-site liquid mixing process, so it has a wide application prospect.
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Key words:
- Ultra-high salinity /
- Salt-tolerance fracturing fluid /
- Polymer dispersion /
- Drainage /
- Integration
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表 1 青海油田高矿化度地层水成分
ρ/（g·cm−3） K++Na+/（mg·L-1） Ca2+/（mg·L-1） Mg2+/（mg·L-1） Cl−/（mg·L-1） SO42−/（mg·L-1） 总矿化度/（mg·L-1） 1.18 67 924.29 6063.65 734.44 111 463.93 8136.28 194 557.93 
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