纳米陶粉对胍胶压裂液性能的影响

Effect of Nano-silica on the Performance of Guar Gum Fracturing Fluids

王川 王世彬 郭建春

WANG Chuan，WANG Shibin，GUO Jianchun

为提高胍胶压裂液耐温性能，适应深层等复杂特殊油气藏的开发，用纳米陶粉与胍胶制得纳米陶粉杂化胍胶压裂液，在压裂液中加入交联剂四硼酸钠得到压裂液冻胶，研究了纳米陶粉加量和交联比对压裂液冻胶表观黏度的影响，考察了压裂液冻胶的耐温性、黏弹性和力学性能。结果表明，纳米陶粉加量和交联比对压裂液冻胶表观黏度的影响较大。配方为0.3%胍胶、3000 mg/L 纳米陶粉、交联比（四硼酸钠与压裂液基液的质量比）为0.2∶100 的纳米陶粉杂化胍胶压裂液冻胶耐温抗剪切性能良好，在170 s-1、90℃下剪切60 min 后的黏度为150mPa·s，较空白胍胶压裂液黏度提高了60 mPa·s。纳米陶粉可均匀分散在胍胶压裂液中，有效增强压裂液的网络结构，增加压裂液的弹性和抗拉强度。与空白压裂液相比，纳米陶粉杂化胍胶压裂液的弹性模量增加45%，变形量为10 mm的拉力增加4 N，可以用于复杂油气藏的压裂开发。图10 参15

In order to improve the temperature resistance of guar gum fracturing fluid and adapt to the development of complex special reservoirs such as deep layer，a nano-silica hybridized fracturing fluid was developed by using nano-silica and guar gum，and the gel was prepared by adding sodium tetraborate crosslinker to fracturing fluid. The effect of mass fraction of nano-silica and crosslinking ratio on the apparent viscosity of gel was studied，and the temperature resistance，viscoelasticity and mechanical property of fracturing fluid gel were investigated. The results showed that it had a big influence of mass fraction of nano-silica and crosslinking ratio on the apparent viscosity of fracturing fluid gel. The nano-silica hybridized fracturing fluid gel which contained 0.3% guar gum，3000 mg/L nano-silica and 0.2∶100 crosslinking ratio（mass ratio of sodium tetraborate to base fluid）showed good temperature and shear resistance. It’s viscosity was 150 mPa·s after shearing 60 min at 170 s-1 and 90℃，which increased 60 mPa·s comparing with pristine guar gum. The network structure of guar gum fracturing fluid gel was enhanced by nano-silica owe to the good dispersion，increased elasticity and tensile strength of fracturing fluid. Compared with that of pristine guar gum，the elastic modulus of nano-silica hybridized fracturing fluid increased 45% and the tensile force increased 4 N under 10 mm deformation.Nano-silica hybridized fracturing fluid could be used in the fracturing development of complex reservoirs.

10.19346/j.cnki.1000-4092.2018.01.006