摘要
评价了羧甲基羟丙基瓜尔胶(CMHPG)压裂液在90～180℃的流变性与伤害特征。该稠化剂水不溶物含量低于1.1%,用于180℃储层的加量为0.60%,基液黏度88.6 mPa.s,交联液在170 1/s剪切100 min后的黏度大于50 mPa.s。0.25%交联液100℃时的储能模量为2.451 Pa,大于0.50%羟丙基瓜尔胶(HPG)交联液的0.7265Pa。CMHPG交联液在低破胶剂浓度下即可快速破胶水化,残渣含量为194～225 mg/L,不到HPG的1/2。CMHPG和HPG交联液对储层岩心的伤害率分别为39.8%、52.3%。CMHPG交联液悬砂性能良好。在排量2～6 m3/min时,0.45%CMHPG压裂液基液(用于150℃高温深井)的摩阻系数与0.30%HPG基液(用于70℃地层)相当。与HPG压裂液相比,CMHPG压裂液具有高弹性、高悬砂性及低稠化剂使用浓度、低基液黏度、低伤害、低摩阻的"二高四低"性能。
The rheological behavior and damage feature of carboxymethyl-hydroxypropyl guar gum（CMHPG） fracturing fluid were evaluated at 90—180℃.The water-insoluble substance content of this viscosifier was lower than 1.1%.The concentration of CMHPG used for 180℃ reservoir formations was of 0.60% with base fluid viscosity 88.6 mPa · s.The viscosity of crosslinked fluid was more than 50 mPa · s with shearing time 100 min at 170 1/s.The storage modulus of 0.25% CMHPG crosslinked fluid was of 2.451 Pa,far larger than that of 0.7265 Pa for 0.50% hydroxypropyl guar gum（HPG） crosslinked fluid at 100℃.CMHPG crosslinked fluid couldbe broken down and hydrated soon with lower concentration of ammonium persulfate,and its residual concentration was of 194—225 mg/L,smaller than half of that for HPG.The core damage rate for CMHPG and HPG crosslinked fluid were 39.8% and 52.3%,respectively.The slurring sand capacity for CMHPG crosslinked fluid was excellent.The tube friction coefficients of base fluids for 0.45% CMHPG（used for deep wells at 150℃） and 0.30% HPG（used for formations at 70℃） were similar with pumping rate 2—6 m3/min.Compared with HPG fracturing fluid,CMHPG fracturing fluid had some advantages,such as high elasticity,great sand suspending capacity,low viscosifier concentration,low base fluid viscosity,low damage and small friction coefficient.
出处
《油田化学》
CAS
CSCD
北大核心
2011年第3期309-313,322,共6页
Oilfield Chemistry
基金
中国石油天然气股份有限公司"十一五"重点项目"长庆特低渗透油藏低伤害高效改造技术研究"(项目编号070119-2)
关键词
羧甲基羟丙基瓜尔胶
压裂液
流变性
黏弹性
岩心伤害
摩阻
carboxymethyl-hydroxypropyl guar gum
fracturing fluid
rheological behavior
viscoelasticity
core damage
friction
