羧甲基羟丙基瓜尔胶压裂液的高温性能评价  

Performance Evaluation of Carboxymethyl-Hydroxypropyl Guar Gum Fracturing Fluids for High Temperature Reservoirs

作　　者：蒋建方[1] 陆红军[2] 慕立俊[2] 赵传峰[1] 顾燕凌[2] 姬振宁[2] 鲁玲[2] 

机构地区：[1]中国石油大学(北京)提高采收率研究中心,北京102249 [2]中国石油长庆油田分公司超低渗透油藏研究中心,陕西西安710021

出　　处：《油田化学》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)

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.

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 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程] TE39