精细石油化工

制备了速溶干粉聚合物增稠剂，采用正交实验法优化了工艺参数，并采用红外光谱法表征了该增稠剂的分子结构。以速溶干粉聚合物型一体化压裂液作为研究对象，在压裂返排液与淡水按照体积比1∶5配制实验用水条件下，评价了速溶干粉聚合物型一体化压裂液的表观黏度、降阻性能、耐温耐剪切性能、破胶性能及对岩心基质伤害，测定了破胶液的表面张力及残渣含量。结果表明：不同黏度的一体化压裂液实验室测试降阻率均大于70%，表现出良好降阻性能；胶液在90℃、170 s^-1剪切2 h条件下，尾黏平均值为33.9 mPa·s，具有良好的耐温耐剪切性能；在60～80℃，破胶剂加入量为0.005%～0.030%条件下，破胶液黏度小于5 mPa·s，破胶液的表面张力小于27 mN/m，破胶彻底，破胶液残渣小于100 mg/L的行业标准要求；采用压裂返排液与淡水混合作为配液用水，在中石化西南某区块开展在线混配压裂施工，取得良好的应用效果。

An instant dry powder polymer thickener was prepared in laboratory using orthogonal experimental method. The molecular structure of the thickener was characterized by infrared spectroscopy. Taking the instant dry powder polymer integrated fracturing fluid as the research object, the apparent viscosity, drag reduction performance, temperature resisting and shearing resistance performance, viscosity break performance, and core permeability damage of the fracturing fluid were studied under the mixing water condition of fracturing flowback fluid and fresh water in a volume ratio of 1∶5. The surface tension of gel breaking liquid and the content of residue were measured. The results showed that the drag reduction rates of different fracturing fluids were all above 70%, and the fracturing fluids had good drag reduction performance. Under the conditions of 90 ℃, 170 s^-1 and shear for 2 h, the average viscosity of the adhesive solution is 33.9 m Pa·s, indicating good temperature and shear resistance. Under the conditions of 60-80 ℃, 0.005%-0.030% breaker, the viscosity of gel breaking liquid is less than 5 m Pa·s, the surface tension of gel breaking liquid is less than 27 m N/m, the breaking is complete, and the residue of the breaking solution is less than 100 mg/L, which is required by industry standards. At last, a mixture of fracturing flow-back fluid and fresh water was used as the mixed water for hydraulic fracturing, and online mixed fracturing construction was carried out in SINOPEC's southwest block, achieving good on-site application results.