摘要
针对植物胶压裂液存在的问题，开发出中高温低浓度合成聚合物压裂液。压裂液组成为：0.35%~0.6%稠化剂SKY-C100A+0.5%~0.7%交联液+0.3%黏土稳定剂LYC-1+0.6%助排剂ZL-1+0.5%破乳剂KCB-1。SKY-C100A 为无水不溶物的阴离子型合成聚合物，通过改变交联调节剂SKY-Y100C加量，体系交联时间可在20~180 s可调。该体系形成的冻胶具有良好的耐温耐剪切性能。SKY-C100A加量为0.35%时，压裂液在80~100℃经170 s-1（包括1000 s-1下高速剪切2 min）剪切2 h后，黏度保持在77~220 mPa·s；SKY-C100A加量为0.45%时，120℃剪切后的黏度约为220 mPa·s；SKY-C100A加量为0.5%时，140℃剪切后的黏度约为83 mPa·s。压裂液冻胶在80℃，经历2 h的静态破胶后残渣含量约为30 mg/L。压裂液在80~120℃下的滤失系数为1.13×10-4~3.62×10-4 m/min0.5，对岩心基质的伤害率为8.3%。与植物胶压裂液相比，该体系不需要其他的pH值调节剂及杀菌剂。
Abstract
In view of existed problem of plant gum fracturing fluid, a new kind of low concentration synthetic polymer fracturing fluid system for middle-high reservoir was developed. The fracturing fluid system included 0.35%—0.6% anionic synthetic polymer SKY-C100A, which was free of water?insoluble?substance, 0.5%—0.7% crosslinked fluid composed of cross linking agent SKY-J100B and cross linking regulator SKY-Y100C, 0.3% clay stabilizer LYC-1, 0.6% cleanup additive ZL-1 and 0.5% demulsifier KCB-1. The cross linking time of fracturing system was adjustable from 20 to 180 s. The results showed that the fracturing gel had good shear resistance and heat-resistant. Under the condition of 80—100℃, SKY-C100A dosage of 0.35%, shearing 120 min at 170 s-1 (including 2 min high shearing at 1000 s-1), the viscosity of fracturing gel was still kept from 77 to 220 mPa·s; that kept about 220 mPa·s with 0.45% SKY-C100A and 120℃; that maintained about 83 mPa·s with 0.5% SKY-C100A and 140℃. Under the static gel breaking condition of 80℃, the residue content in gel-broken fluid was 30 mg/L within 2 h. At 80—120℃, the filtration coefficient was 1.13×10-4—3.62×10-4 m/min0.5, and the damage rate to artificial core matrix was only 8.3%. Comparing with plant gum fracturing fluid, the new fracturing system did not require other pH regulator and bactericides.
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