纳米TiO_2改性MES黏弹性胶束溶液的性能  

Performance of Nano-TiO_2 Modified MES Viscoelastic Micelle Solution

作　　者：罗明良[1] 贾自龙[1] 孙厚台[1] 温庆志[1] 

机构地区：[1]中国石油大学石油工程学院,山东青岛266555

出　　处：《石油学报（石油加工）》2012年第3期456-462,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(50904076)资助

摘　　要：以可生物降解表面活性剂脂肪酸甲酯磺酸盐(MES)为原料,借助纳米TiO2与MES胶束的拟交联作用改善MES黏弹性胶束溶液的耐温性与降滤失性,并采用流变测试方法优化了纳米TiO2改性MES黏弹性胶束溶液各组分的质量分数,考察了纳米TiO2对MES黏弹性胶束溶液热稳定性、降滤失性、悬砂性、破胶性能以及岩心渗透率的影响,分析了纳米TiO2对MES黏弹性胶束溶液耐温性与降滤失性的影响机制。结果表明,纳米TiO2改性MES黏弹性胶束溶液的热稳定性明显增强,在70℃、170s-1条件下,其表观黏度达50mPa.s;支撑剂沉降速率明显降低,幅度达30%以上;通过纳米TiO2对MES胶束的拟交联作用,较大幅度地提高了MES胶束溶液的高温降滤失性能,且不影响MES清洁压裂液的破胶性能;纳米TiO2改性MES黏弹性胶束溶液的破胶滤液对地层伤害小,岩心渗透率恢复率约为85%。The thermal stability and filtration control properties of biodegradable surfactant fatty acid methyl ester sulfonate （MES） viscoelastic micelle solution were improved by the pseudocrosslink between MES micelle and nano-TiO2. The mass fraction of components in nano-TiO2 modified MES viscoelastic solution was optimized by theological measurements. Effects of nano- TiO2 on the properties of MES viscoelastic solution were investigated, such as thermal stability, filtration control, proppant suspension, gelout and core permeability, etc. The mechanisms of nano-TiO2 effect on the thermal stability and filtration control of MES viscoelastic solution were analyzed. The results showed that the thermal stability of nano-TiO2 modified MES viscoelastic solution was strengthened and the apparent viscosity reached 50 mPa. s at 70℃ and 170 s-1 , and the settling rate declined by 30% compared with MES viscoelatic solution. The filtration control properties of nano-TiO2 modified MES viscoelastic solution was improved by nano-TiO2 association with MES micelles, but the gelout properties was not affected. The core flow experiments showed that the damage of the gelout liquid for the oil ＆ gas formation was a little and the permeability recovery ratio reached about 85%

关 键 词：脂肪酸甲酯磺酸盐(MES) 可生物降解 纳米TIO2 黏弹性 热稳定性 降滤失性 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]