摘要
奈曼油田交联冻胶压裂液体系存在破胶不彻底、残渣量大、地层伤害严重等问题。因此,对高温生物酶破胶剂在奈曼油田压裂液体系中的应用可行性、适用性,以及破胶效果进行了室内评价。结果表明,在100～120℃下,添加酶保护剂后,生物酶单独作用或生物酶与少量APS复配作用,奈曼压裂液体系均可在2 h内彻底破胶,破胶液黏度小于5 mPa.s,残渣量降至380 mg/L。矿场试验表明,复配使用高温生物酶和APS复破胶的2口井压裂液返排率均达50%以上,与同期采用APS作为破胶剂的4口井相比高出10%～15%,施工产能效果良好,压裂施工后产量增加27%～36%。
There are some problems in crosslinked gel fracturing fluid system of Naiman oil field,such as amount of residues and severe damage to reservoirs.To solve these problems,the feasibility and applicability of high temperature enzymatic breaker used in Naiman fracturing fluid system are evaluated in lab.The experimental results show that the Naiman fracturing fluid system can be broken within 2 hours cooperated with enzymatic preservative agent separated or enzymatic preservative agent and APS combined,and the viscosity of broken fluid is less than 5 mPa.s and the amount of residues is not more than 380 mg/L.The applications of two wells show that the flow back rates are more than 50% that are higher than the 4 wells used APS as breaker of 10%-15%,and the production increases by 27%-36% after fracturing.
出处
《钻井液与完井液》
CAS
2011年第6期61-63,96,共3页
Drilling Fluid & Completion Fluid
关键词
高温酶破胶剂
压裂
酶保护剂
APS
High temperature enzymatic breaker
Fracturing
Enzymatic preservative agent
APS
