锆冻胶分散体调驱剂的制备与性能评价

Preparation and Performance Evaluation of Zirconium Gel Dispersion Agent

为减弱地面剪切和吸附与稀释作用等因素对冻胶成冻性能的影响,将已成冻的锆本体冻胶经胶体磨的机械剪切制得锆冻胶分散体,室内研究了本体冻胶强度、剪切时间和剪切间距对锆冻胶分散体黏度和粒径的影响,考察了锆冻胶分散体的封堵调剖性能。结果表明,通过调整聚合物和有机锆交联剂的加量,可以调节锆本体冻胶体系的成冻时间和成冻强度,随着聚合物和交联剂加量的增大,交联越快,强度越大;锆冻胶分散体为粒径5.66数224.87μm的颗粒,黏度在1.8数41.0 m Pa·s内可调;随着本体冻胶强度和剪切间距的增大,锆冻胶分散体黏度和粒径增大;剪切时间越长,锆冻胶分散体黏度越低,粒径越小;驱油实验结果表明,随岩心渗透率增加,冻胶分散体对岩心的封堵率降低,锆冻胶分散体能有效调整渗流剖面,采收率增幅为46%。

In order to weaken the effect of shearing,adsorption and dilution on the bulk gel,a new profile control agent（zirconium gel dispersion agent）was prepared by the mechanical shear method with zirconium gel. The main influence factors such as bulk gel strength,shear time and shear distance on the viscosity and particle size of dispersion agent were evaluated,and the plugging and profile control performance of dispersion agent was studied in laboratory. The results showed that the gelation time and gel strength of zirconium bulk gel could be controlled by adjusting the dosage of polymer and zirconium crosslinker. With increasing dosage of both polymer and crosslinker,the crosslinking rate accelerated and gel strength became stronger. The size of zirconium gel dispersion could be controlled from 5.66 to 224.87 μm by adjusting bulk gel strength,shear time and shear distance,whereas,the viscosity ranged from 1.8 to 41.0 m Pa·s. With increasing bulk gel strength and shear distance,the viscosity and particle size of dispersion agent increased,while that decreased with increasing shear time. The core flooding test results showed that the plugging rate of zirconium gel dispersion decreased with increasing core permeability. The dispersion agent had an ability to control injection profile,and enhanced oil recovery rate was up to 46%.