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%率0.6%稠化剂SKY-C100A+0.5%率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率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率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率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率120℃下的滤失系数为1.13×10-4率3.62×10-4m/min1/2,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。
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-C100 A,which was free of water insoluble substance,0.5% —0.7% crosslinked fluid composed of cross linking agent SKY-J100 B and cross linking regulator SKY-Y100 C,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-C100 A dosage of 0.35%,shearing 120 min at170 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-C100 A and 120℃;that maintained about 83 mPa·s with 0.5% SKY-C100 A 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—3.62×10-4m/min1/2,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.
出处
《油田化学》
CAS
CSCD
北大核心
2014年第3期343-347,共5页
Oilfield Chemistry
关键词
中高温油藏
低浓度
合成聚合物
压裂液
middle-high temperature
low concentration
synthetic polymer
fracturing fluid
