摘要
研究了用生物酶破胶剂来解决克拉玛依油田压裂液体系破胶不彻底、对地层伤害大这一难题的可行性。结果表明,调整生物酶用量至250 mg/L和添加酶保护剂250 mg/L,并与0.01%过硫酸铵复配,2.5 h可以彻底破胶,破胶液黏度为3.3 mPa.s,残渣量280 mg/L,且无返胶现象。质谱分析破胶液分子量集中在2 147～6 366 Da,主要为13～39低聚糖分子,表明生物酶破胶剂将瓜尔胶彻底降解成小分子的多糖化合物,解决了破胶不彻底并返胶的难题。
Karamay field fracturing fluid system occurs in the problems of incomplete guar gum breaking and oil layer damage.The study showed that the high-temperature enzyme breaker had incompatibility with additives of the Karamay fracturing fluid system.The fracturing fluid viscosity can be reduced to 3.3 mPa·s within 2.5 h by adding 250 mg/L enzyme breaker,250 mg/L protective agent and 0.01% ammonium persulfate,and the residue of 280 mg/L,which meet the national standards of an oilfield.The molecular weight of the fracturing fluid was measured by mass spectrometry,which was mainly concentrated in the range of 2 147～6 366 Da,indicating that the enzyme breaker can be used to decrease the viscosity of fracturing fluid and degrades gum to oligosaccharides.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第5期547-549,共3页
Xinjiang Petroleum Geology
关键词
克拉玛依油田
生物酶破胶剂
高温
压裂
保护剂
黏度
残渣
Karamay field
enzyme breaker
high temperature
fracturing
protective agent
viscosity
residue
作者简介
张天翔1965一），男，汀苏R兴人，高级一程师，硕十，油气层改造，（Tel）0990—6885660（E—mail）eyyzhangtx@163.com
