委内瑞拉重油冷采新方法室内探索

发布时间：2018-04-01 07:47

本文选题：重油　切入点：降黏剂　出处：《油田化学》2017年03期

【摘要】：委内瑞拉MPE3区块油藏重油黏度高、油层厚度极大且非均质性严重,为降低热采方法的成本和碳排放量,使用自制的重油降黏剂和人造岩心进行了重油冷采新技术室内研究,考察了凝胶调剖和降黏剂对岩心驱油效果的影响。结果表明,研制的涂层降黏剂在多孔介质中可剥离重油,产生造粒降黏提高采收率的效果。通过凝胶调剖处理可与降黏剂驱替重油产生协同效应,既扩大降黏剂波及效率可接触新的重油,又有利于重油的造粒降黏。随岩心渗透率增大,泄油后的地层越易形成高渗透水窜通道。采用聚合物凝胶处理或者气体-降黏剂交替注入进行调剖,可以较大幅度地提高重油的采收率。在气液交注吞吐冷采过程中,注入的气液既增加地层能量,又可搅动地层流体,有利于涂层降黏剂与稠油混合形成低黏乳状液,便于吐出。气液交注吞吐冷采过程的采收率增量可达16.10%OOIP。
[Abstract]:In order to reduce the cost and carbon emission of thermal recovery method, a new technology of heavy oil cold recovery was studied by using self-made heavy oil viscosity reducer and artificial core, in order to reduce the cost of thermal recovery method and reduce the carbon emission in the reservoir of MPE3 block in Venezuela with high viscosity, great thickness and serious heterogeneity.The effect of gel profile control and viscosity reducing agent on core flooding was investigated.The results show that the coating viscosity reducer can peel off the heavy oil in porous media and produce the effect of granulating viscosity reduction to improve the recovery efficiency.The gel profile control treatment can produce synergistic effect with viscosity reducer flooding heavy oil, which can not only expand the viscosity reducing agent sweep efficiency, but also benefit to the granulation and viscosity reduction of heavy oil.With the increase of core permeability, it is easy to form high permeable water channeling channel after oil discharge.Using polymer gel treatment or alternative injection of gas and viscosity reducer for profile control can greatly improve the recovery of heavy oil.During the cold production process of gas-liquid injection injection, the injected gas-liquid can not only increase the formation energy but also stir the formation fluid, which is beneficial to the mixing of coating viscosity reducer and heavy oil to form low viscosity emulsion, which is easy to spit out.The oil recovery increment of gas-liquid injection injection stimulation process can reach 16.10 OOIP.
【作者单位】：中国石油勘探开发研究院;中国石油天然气集团公司纳米化学重点实验室;
【分类号】：TE355

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