耐高温低伤害VES-HT01压裂液的性能

用具有超分子结构的阴离子型表面活性剂VES-HT01与6% KCl复配，得到新型耐高温低伤害的阴离子VES压裂液。压裂液性能评价结果表明，在100 s^-1剪切速率下，随温度升高，压裂液黏度先增加后降低，在100℃左右达到最高值180 mPa·s，150oC时的黏度为55 mPa·s。在140℃、170 s^-1下剪切60 min，黏度基本保持不变。黏弹性较好。25℃、100℃下陶粒在压裂液中的沉降速率分别为5、33 mm/min，悬砂性较好。在50℃、100℃下分别加入2%、1%柴油静置120 min后，压裂液黏度为3 mPa·s，无残渣，破胶液表面张力为23.5 mN/m。抗菌性良好。成本与常规瓜尔胶压裂液相当。

Properties of High Temperature Fracturing Fluids VES-HT01 with Low Formation Damage

A high temperature fracturing fluid with low formation damage was developed by mixing supramolecular anionic surfactant (VES-HT01) and 6% KCl. Fracturing fluid evaluating experiment results showed that the viscosity of fracturing fluid increased first and then decreased with increasing temperature when the shearing rate was 100 s^-1. The maximum viscosity was 180 mPa·s at 100oC and the viscosity was 55 mPa·s at 150oC. The fluid viscosity was unchanged after shearing 60 min at 140oC and 170 s^-1, which showed good viscoelasticity. The settlement rate of ceramic proppant in fracturing fluid was 5 and 33 mm/min at 25oC and 100oC, respectively. The VES gel could be broken with no residue by contacting with 2%, 1% diesel after 120 min at 50oC and 100oC. The viscosity of broken-gel fluid was 3 mPa·s and surface tension was 23.5 mN/m. The fracturing fluid had good anti-microbial properties. The cost of fluid was comparable to that of conventional guar fracturing fluid.