液态CO_2增稠压裂液流变性能分析  

Analysis on Rheological Properties of Thickened Liquid CO_2 Fracturing Fluid

作　　者：崔伟香[1] 舒玉华[1] 崔明月[1] 王春鹏[1] 

机构地区：[1]中国石油勘探开发研究院,河北廊坊065007

出　　处：《油田化学》2017年第2期250-254,264,共6页Oilfield Chemistry

基　　金：国家科技重大专项课题"低渗;特低渗透油气田经济开发关键技术"(项目编号2011ZX05013-003)

摘　　要：针对目前CO_2干法压裂工艺技术存在压裂液黏度低、携砂困难等技术难题,将氟醚羧酸盐类表面活性剂增稠剂(FAL-16)和络合金属离子(铝)有机盐增稠助剂(FAL-31)分别按1%加量加入液态CO_2中制备了液态CO_2增稠压裂液,采用高压管路流变实验模拟了液态CO_2增稠压裂液在管路内的增稠过程,研究了液态CO_2增稠压裂液的流变性能。研究结果表明:在液态CO_2中加入1%的增稠剂FAL-16和1%增稠助剂FAL-31能显著提高液态CO_2压裂液的黏度,液态CO_2增稠压裂液的黏度最高可以达到20 m Pa·s(压力20 MPa、温度0℃、剪切速率393 s-1),增黏倍数在90数498之间,液态CO_2增稠压裂液呈现剪切稀化特性,黏度随着温度的增加呈指数递减;随温度的升高,液态CO_2增稠压裂液体系的流动指数n增大,稠度系数k减小。At present,CO_2 fracturing technology faces many challenges of low viscosity and poor sand carrying capacity. The thickened liquid CO_2 fracturing fluid（TLCFF）was prepared by add a new thickener FAL-16（fluorine ether carboxylate surfactant）and auxiliary additive FAL-31（complexing metal ion（aluminum）organic salt）at the dosage of 1% into the liquid CO_2,and the rheological properties of the TLCFF were evaluated by a high pressure pipeline rheological experimental device. The results showed that,the viscosity of the liquid CO_2fracturing fluid could be improved significantly by adding 1%FAL-16 and 1%FAL-31,and the viscosity of the TLCFF was up to 20 m Pa·s（20 MPa,0℃,393 s^（-1））,which was 86—498 times higher than that of pure CO_2.The TLCFF showed the characteristic of shear thinning,the viscosity decreased exponentially with the increase of temperature.With the increase of temperature,the flow index n of the TLCFF increased,while the consistency coefficient k of the TLCFF decreased.

关 键 词：CO2干法压裂 液态CO2增稠压裂液 高压管路流变测试 黏度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]