可回收聚合物压裂液体系及其性能研究

Study on Recyclable Polymer Fracturing Fluid System and Its Performance

王所良 黄永章 樊庆缘

WANG Suoliang HUANG Yongzhang FAN Qingyuan

为建立压裂返排液的重复利用技术， 以聚合物 （部分水解聚丙烯酰胺）、 助排剂 （氟碳表面活性剂）、 黏土稳定剂 （小分子阳离子聚合物） 和有机金属交联剂为原料制得一种可由压裂液返排液配制的可回收压裂液体系， 比较了用清水和破胶液 （模拟现场返排液） 配制的压裂液的各项性能。结果表明， 部分水解聚丙烯酰胺在水中溶解迅速， 可以满足现场连续混配施工； 用清水配制的压裂液耐温（105℃）耐剪切性和剪切恢复性较好， 常温下的黏度损失率为 57%； 压裂液弹性良好； 同条件下与清水相比压裂液摩阻降低率大于 40%； 压裂液在 95℃下可彻底破胶， 破胶液黏度小于 5 mPa·s， 残渣含量为 11.7 mg/L， 对岩心基质渗透率的损害率为 10.94%。在破胶液中添加0.12%稳定剂即可作为配液水重复利用， 破胶液配制压裂液的各项性能与清水配制压裂液的相当， 可以满足现场 压裂施工的需求。图 5表 7参 13

In order to establish reuse technology of fracturing folwback fluid，a new recyclable polymer farcturing fluid system including polymer thicker （partially hydrolyzed polyacrylamide），clean up agent （fluorocarbon surfactant），clay stabilizer（cationic polymer with low molecular weight） and organo-metallic crosslinker was studied in laboratory. The properties of fracturing fluid made by fresh water and gel breaking liquid（field simulation of fracturing fluid）were compared. The results showed that polymer thicker dissolved faster which could meet the requirements of online mixing. The fracturing fluid made by fresh water had good temperature（105℃）and shear resistance，good shear recovery and viscoelasticity. The viscosity loss ratio of fracturing fluid was 57% at room temperature. The fraction reduction ratio of fracturing fluid was more than 40% comparing with water under the same conditions. The fracturing fluid could be completely broken at 95℃，the viscosity of gel breaking liquid was less than 5 mPa·s，the residue was 11.7 mg/L，and the damage rate of core permeability was 10.94%. The gel breaking liquid could be reused after adding 0.12% stabilizer. The performance of farcturing fluid system made by gel breaking liquid was similar to that by fresh water，which could met the requirement of oilfield operation.

10.19346./j.cnki.1000-4092.2017.04.006