含油污泥凝胶体系的研制及性能评价

Development and performance evaluation of gel plugging system for oily sludge

摘要:

哈拉哈塘油田具有高温高盐的特点，常规调剖剂应用困难。通过改善含油污泥性质，选择匹配聚丙烯酰胺凝胶体系，研究出耐温耐盐含油污泥凝胶体系，可用于高温高盐油藏调剖堵水，优化配方组成（质量分数）：20%含油污泥+0.8%耐高温聚丙烯酰胺NWX-1+0.2%酚醛树脂+5%改性聚合单体（AMPS）+0.01%引发剂过硫酸钾+0.5%增强剂蒙脱土。通过对体系的结构、流变性、突破压力等性能评价，结果表明：体系成胶时间在1.6 h以上可控；微观结构显示出致密三维网状结构，强度可达到I级；增强剂可有效提升体系黏弹性模量，蠕变后可回复；突破压力可达3240 kPa/m。

Abstract:

Halahatang oilfield is characterized by high temperature and high salinity, and the application of conventional profile control agent is difficult. By improving the properties of oil-bearing sludge and selecting and matching polyacrylamide gel system, the oil-bearing sludge gel system with temperature and salt resistance is studied, which can be used for profile control and water plugging of high-temperature and high-salt oil reservoirs.The optimized formula composition (mass fraction) was as follows: 20% oil sludge+0.8% high temperature resistant polyacrylamide NWX-1+0.2% phenolic resin +5% modified polymer monomer (AMPS)+0.01% initiator potassium persulfate + 0.5% enhancer montmorillonite. The microstructure, rheology and breakthrough pressure of the system were evaluated. The results show that the gelation time of the system is controllable. The microstructure shows a dense three-dimensional network structure with higher strength. The viscoelastic modulus of the system can be improved effectively by compounding the reinforcing agent, and the system can recover after creep. The breakthrough pressure can reach 3240 kPa/m.