适应中国主要气田的纳米粒子泡排剂系列

Nanoparticle foaming agents for major gas fields in China

针对常规泡排剂在中国不同类型气田,特别是高温、高盐、高含酸性气体、高含凝析油的气田中应用存在的性能适应性差、成本高的问题,构建了以Gemini双子表面活性剂作为主剂来提升泡排剂起泡性和稳泡性、接枝修饰纳米粒子作为稳泡剂进一步提升生成泡沫稳定性、优化特征助剂适应不同类型气藏的“三位一体”研发思路,制备出2大类6小类适应中国主要气田的纳米粒子泡排剂系列。性能实验评价结果表明,该泡排剂系列总体耐温可达到160℃,耐矿化度250 000 mg/L,抗H2S为100 mg/L,抗CO2、抗凝析油分别可达100%、40%。在中国主要气田开展了8 685井次的规模应用,施工后平均单井天然气产量增加62.48%、油套压差降低18.9%;综合成本较常规泡排剂降低45%以上,降本增效作用显著。

The conventional foaming agents have the problems of poor adaptability and high cost during the application in different types of gas fields,especially in high temperature,high salinity,high acidic gas and high condensate oil and gas fields.In this study,the Gemini foaming agent was used as the main agent to enhance foaming and foam stability of the foaming agent,the grafted nanoparticles were used as foam stabilizer to further improve the foam stability,and the characteristic auxiliaries were added to make the foaming agent suitable for different types of gas reservoirs.Two types and six subtypes of nanoparticle foaming agents have been prepared for the main gas fields of China.The experimental evaluation results show that the overall temperature resistance,salinity resistance,H2S resistance,CO2 resistance and condensate resistance of the nanoparticle foaming agents can reach 160℃,250 000 mg/L,100 mg/L,100%and 40%,respectively.The new foaming agents have been used in 8685 wells in China.Compared with conventional foaming agent,the average gas flow rate per well increased by 62.48%,the pressure difference(casing-tubing)decreased by 18.9%,and the cost dropped by 45%.The effect of reducing cost and increasing efficiency is obvious.