超分子聚合物类清洁压裂液用浓缩稠化剂的制备及性能

Preparation and performance evaluation of Slurry thickener for supramolecular polymer clean fracturing fluid

摘要:

针对目前压裂液用干粉稠化剂连续配注工艺技术中存在的粉尘大、混合不均匀、溶解时间长等问题，在目前应用成熟的超分子聚合物类稠化剂BCG的基础上，研究开发了一种由液体石蜡、甲醇、乳化剂、分散剂和稠化剂配制而成的浓缩稠化剂，该稠化剂稳定性和流动性良好。性能测试表明，该浓缩稠化剂水化时间仅为0.8min，溶解过程中不产生“鱼眼”，可实现现场快速配制。配制的压裂液具有良好的耐温耐剪切能力，当使用浓度为1.6%时，在170℃、170S-1下恒温剪切2h，最终粘度稳定在40mPa?s左右，此外，该压裂液具有优良的悬砂性能，且在不同温度条件下均可彻底破胶，破胶后的表面张力和残渣含量较低，各项性能与干粉稠化剂配制的压裂液相当。

Abstract:

several problems have long existed in continuous preparation and injection of fracuturing fluid with dry thickening agents. Those problems include dusting, non-homogeneity of the fracturing fluid (such as generation of solid particles and gel congolmerates of dry thickening agents when dissolving in water ), and long dissolution time of thickening agnets etc. Based on the application of BCG, a mature supramolecular polymer thickener, a thickener was developed, which was composed of liquid paraffin, methanol, emulsifier, dispersant and thickener. The performance test shows that the hydration time of the thickener is only 0.8min, and there is no "fish-eye" in the dissolution process, so it can be prepared quickly in the field. Preparation of fracturing fluid has good heat resistance shear reisstance ability, when using a concentration of 1.6%, constant temperature under 170℃, 170S-1 shear 2 h, final viscosity stability at around 40 mpa s, in addition, the fracturing fluid has excellent suspended sand performance, and under the condition of different temperatures can be completely break. The breaking fluid has low surface tension and residue content. The properties of the fracturing fluid prepared by the thickener are equivalent to the fracturing liquid phase prepared by the dry powder thickener.