纳米交联剂BC-27的制备及性能研究

The Preparation and Properties Research of Nano-crosslinker BC-27

摘要:

使用硅烷偶联剂对纳米二氧化硅表面进行化学改性和修饰，制备出一种纳米有机硼交联剂BC-27，采用FTIR、SEM、高温流变仪、高温高压失水仪对交联剂BC-27及其配制的压裂液进行了结构表征与性能测试，考察了改性纳米SiO2含量、稠化剂羟丙基胍胶（HPG）质量分数、交联比（压裂液基液与交联剂的质量之比）、pH值对交联剂BC-27交联性能的影响，并测试了交联剂形成羟丙基胍胶压裂液的抗温抗剪切性能、静态滤失性能、破胶与反排性能以及岩芯渗透率伤害性能。研究结果表明：w（改性纳米SiO2）=0.18%时制备得到纳米交联剂BC-27的性能最佳；当压裂液基液中w（HPG）=0.35%，交联比为100:0.3，调节pH值约为11时，形成的压裂液冻胶效果最好，最高抗温温度为130℃，交联时间在89～225s可调；纳米有机硼交联剂BC-27配制的压裂液在130℃下连续剪切120min，其黏度仍保持在440mPa·s以上，而普通有机硼交联剂OS-150配制的压裂液仅为280mPa·s左右；有机硼交联剂OS-150形成的压裂液对储层岩芯伤害率为23.08%，而交联剂BC-27形成的压裂液仅为19.47%。该纳米交联剂性能优异，具有良好的延缓交联性能，可有效降低羟丙基胍胶用量。

Abstract:

We utilized the silane coupling agent to transform and decorate the chemical property of the Nano-SiO2 on its surface. By this means, we can acquire BC-27, an organic boron Nano-crosslinker. At the same time, we test the structural features and properties of BC-27 and its fracturing fluid by adopting FTIR、SEM、High temperature rheometer、High temperature and high pressure filtration apparatus. Meanwhile, we prospected the content of the modified Nano-SiO2, the weight percent of HPG, cross-linking rate and the pH value influence on the cross-linking property of BC-27. We also assessed these properties of the hydroxypropyl guar fracturing fluids formed by BC-27, such as the ability of heat resistance and shear resistance, filter loss, breaking viscosity, the flowing back and the detriment of core. The study shows :When w(The modified Nano-SiO2) = 0.18％,the property of the Nano-crosslinker BC-27 is the best. When w(HPG) = 0.35％ , the cross-linking rate is 100:0.3 and the pH rate is about 11, the properties of the fracturing fluid is the best :the highest anti-temperature value is 130℃,and the cross-linking time is adjustable between 89s to 225s. What’s more, the viscosity of the fracturing fluid with organic boron Nano-crosslinker BC-27 is at least 440mPa·s ,which shear a duration of 120min at 130℃. While the viscosity of fracturing fluid with the common organic boron crosslinker OS-150, just keeps the value about 280mPa·s. Besides, the ratio of core injury is 23.08% by the fracturing fluid with OS-150, and the ratio of core detriment can slump to 19.47% by the fracturing fluid with BC-27. The characteristics of Nano-crosslinker was wonderful, its own favorable delay performance, and could efficiently reduce the doses of hydroxypropyl guar.