磺酸型表面活性剂清洁压裂液的性能研究

The Performance of Sulfonic Surfactant Clean Fracturing Fluid

张锋三 沈一丁 任婷 王磊 马国艳

ZHANG Fengsan SHEN Yiding REN Ting WANG Lei MA Guoyan

为研制新型清洁压裂液，采用脂肪酸甲酯磺酸钠与芥酸酰胺丙基甜菜碱复配得到了一种增稠剂MC-1，研究了MC-1及无机盐加量对压裂液黏度的影响，考察了压裂液（3% MC-1+5% KCl）的耐温性、耐剪切性、悬砂性和破胶性能。结果表明，MC-1与多种无机盐KCl、NH4Cl和NaCl均有较好的协同性，其中与KCl的协同性最好，压裂液黏度随MC-1和KCl加量增大而增加；该压裂液具有较好的耐温耐剪切性和悬砂性，在80℃、砂比40%的条件下，砂子的沉降速度为1.18 mm/s；与煤油混合后在80℃下2 h内完全破胶，破胶液黏度为4.5 mPa?s，表面张力为24 mN/m，界面张力为0.8764 mN/m。该压裂液可适用于小于90℃的地层使用。图5表2参12

For the development of a new clean fracturing fluid, a thickener MC-1 was obtained by compounding sodium fatty acid methyl ester sulfonate (MES) and erucyl amidopropyl carboxyl betaine (CAB). The effect of the content of MC-1 and inorganic salt on the viscosity of MES fracturing fluid was studied. The temperature and shearing resistance, sand-carrying capacity and gel breaking performances of the clean fracturing fluid (3% MC-1+4% KCl) were evaluated. The results showed that MC-1 thickener had a good compatibility with ionic salt, such as KCl, NH4Cl and NaCl, among which KCl was the best. The viscosity of fracturing fluid increased with increasing content of MC-1 and KCl. The fracturing fluid possessed good temperature tolerance and shearing resistance. The settling velocity was 1.18 mm/s on the condition of 80℃ and 40% sand ratio, which indicated that the fracturing fluid had a good sand-carrying capacity. The fracturing fluid completely broke down in 2 hrs at 80℃ with the addition of kerosene. The viscosity of the gel breaking liquid was 4.5 mPa?s, and the surface tension and interfacial tension of that was 24 mN/m and 0.8764 mN/m, respectively. The fracturing fluid was adapt to the formation whose temperature was smaller than 90℃.