合成聚合物SJ-1压裂液室内研究  

Laboratory Study on a New Synthetic Polymer Based Aqueous Crosslinking/Gelling Hydrofracturing Fluid

作　　者：胡展东[1] 陈红梅[1] 张爱民[1] 薛小佳[2] 吴江[2] 

机构地区：[1]高分子科学与工程国家重点实验室(四川大学),四川成都610065 [2]中国石油长庆油田分公司油气工艺技术研究院,陕西西安710021

出　　处：《油田化学》2009年第2期135-138,共4页Oilfield Chemistry

摘　　要：报道了一种合成聚合物基冻胶压裂液的基本性能。该聚合物SJ-1具碳碳主链,含大量羟基和亲水性短支链,相对分子质量很低,Mη=8.5×104,不含水不溶物,2%水溶液的黏度为6mPa.s。通过测定压裂液70℃、1701/s下的黏度,确定基液的组成为:1.7%SJ-1+0.5%防膨剂+0.5%助排剂,使用商品有机硼交联剂JL-2,加量为基液体积的2%。该压裂液在酸性条件下不交联,最佳pH值为9,黏度随温度升高(20～70℃)而下降,70℃、1701/s下连续剪切时黏度先降后升,最低值～300mPa.s。加入0.1%～0.5%过硫酸铵,在30～70℃下1～4小时破胶,破胶液黏度很低,不含残渣,表、界面张力低于瓜尔胶压裂液破胶液,防膨性能好于0.5%防膨剂溶液;对低渗透岩心(气测渗透率0.2×10-3、0.4×10-3μm2)水测渗透率的伤害约为20%。The basic performance properties of a synthetic polymer based hydrofractufing fluid（HFF） are presented. Notated as SJ-1, this polymer of carbon-carbon backbone with large amount of hydroxyls and short hydrophilie side groups has low molar mass of Mη = 8. 5 × 10^4 and contains no water insoluble substances and its 2% aqueous solution has low viscosity of 6 mPa. s. Through measuring viscosity of gelled HFF at 70℃ and 170 1/s, a base fluid composed of 1.7% SJ-1,0. 5% clay stabilizer, and 0.5% cleanup additive is prepared and a commercial bor organic erosslinker,JL-2 ,is taken at dosage of 2% of base fluid volume. This HFF does not gelate in acidic media and the optimal pH value is of 9 ; the viscosity of gelled HFF lowers down with raising temperature from 20℃ to 70℃ and goes through a minimum when shearing at 70℃ and 170 1/s in 90 minutes, keeping a value not lower than about 300 mPa·s;the gelled HFF breaks down at 30--70℃ in 1----4 hrs eontrollably with 0. 1--0.5% ammonium persulfate introduced;the broken HFF has low viscosity,contains no solid residue substances, has surface and interfacial tensions lower than broken guar gum based HFF and causes slighter damage of about 20% to water phase permeability of reservoir cores of gas permeability 0.2 × 10 ^-3 and 0.4 × 10 ^-3μm^2.

关 键 词：水基冻胶压裂液 合成聚合物 线型多羟基聚合物 稠化剂 硼冻胶 配方研究 低伤害 特低渗储层 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程] TE39