非交联植物胶XG-1压裂液技术  

Non-Crosslinking Vegetable Gum Fracturing Fluid XG-1 Technology

作　　者：邬国栋 阿不都维力.阿不力米提 杨建强 董景锋 怡宝安 

机构地区：[1]新疆油田公司工程技术研究院

出　　处：《钻井液与完井液》2015年第4期81-83,87,共4页Drilling Fluid & Completion Fluid

摘　　要：基于黄原胶XG在水溶液中形成棒状双螺旋结构聚合体,研制了非交联型植物胶XG-1压裂液,并给出了压裂液配方。研究结果表明,XG-1稠化剂用量为0.5%时,压裂液表观黏度超过70 m Pa·s,其表观黏度随着温度升高而降低,50~100℃时体系表观黏度大于40 m Pa·s,p H值在2~12时表观黏度均保持在60 m Pa·s左右,分别采用氯化钾、氯化钙盐水配制压裂液,20%氯化钾、20%氯化钙溶液配制的压裂液表观黏度均大于40 m Pa·s,体系具有良好的耐盐性能;压裂液黏度大于40 m Pa·s时,支撑剂沉降速度大于0.014 mm/s,破胶液黏度大于5 m Pa·s,表界面张力与瓜胶压裂液类似,增稠剂浓度为0.5%的压裂液破胶残渣含量为90 mg/L,远低于同浓度瓜胶压裂液残渣含量,现场应用效果良好。该压裂液可用于中低渗、天然裂缝不发育储层的压裂改造。A non-crosslinking vegetable gum fracturing fluid XG-1 was developed based on the concept that xanthan gum(XG) forms rod-shaped double helix polymer in water solution. The fracturing fluid treated with 0.5% XG-1 had apparent viscosity(AV) over 70 m Pa·s, and over 40 m Pa·s at 50-100 ℃ because the AV of the fracturing fluid decreased with temperature. When p H ofthe fracturing fluid was maintained between 2 and 12, the AV would be maintained at about 60 m Pa·s. Fracturing fluids prepared with 20% KCl and 20% Ca Cl2 both had AV greater than 40 m Pa·s, and both had good salt tolerance. When the AV of the fracturing fluids were greater than 40 m Pa·s, settling velocity of the proppant would be greater than 0.014 mm/s, and the gel-broken fluid had viscosity greater than 5 m Pa·s, with its surface tension similar to that of guar gum fracturing fluids. Fracturing fluid treated with 0.5% XG-1 had residue content of 90 mg/L after gel-breaking, far less than that of the guar gum fracturing fluids at the same viscosifier concentration. This fracturing fluid can be used in the fracturing operation of medium- to low-permeability reservoirs with few natural fractures.

关 键 词：非交联压裂液 酸敏储层 碱敏储层 低残渣 应用性能 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]