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深部调驱用凝胶颗粒与孔喉适应性评价
王飞
0
(中国石化中原油田分公司,河南濮阳457001)
摘要:
为进一步提高凝胶颗粒深部调驱效果,针对长期水驱开发油藏非均质性强、剩余油分布多的特点,开展深部调驱用凝胶颗粒与孔喉的适应性评价。通过核磁共振实验定量确定长期水驱开发过程中的孔喉半径演化过程。基于定量微孔滤膜实验,建立匹配因子(δ)与运移-封堵之间的关系。采用物理模拟动态实验,验证凝胶颗粒的深部运移、剖面改善和提高采收率性能。研究结果表明:凝胶颗粒粒径与孔喉的匹配关系对深部调驱的作用深度影响较大。当1.0<δ≤3.0时,凝胶颗粒最有利于实现深部调驱。凝胶颗粒以滞留、架桥等形式对高渗透层产生有效封堵,对非均质岩心的剖面改善率可达97.2%。三层非均质岩心对比实验结果表明,在最佳匹配因子条件下,凝胶颗粒具有良好的深部运移和封堵性能,提高采收率可达29.3%。
关键词:  凝胶颗粒  匹配因子  深部调驱  分流量  提高采收率
DOI:10.13673/j.cnki.cn37-1359/te.2020.03.013
基金项目:中国石化重大科技攻关项目“中深层油田高含水期水驱效益开发技术”(P16070)。
Adaptability evaluation of gel particles and pore throat for deep profile control
WANG Fei
(Zhongyuan Oilfield Company,SINOPEC,Puyang City,Henan Province,457001,China)
Abstract:
In order to further improve the performance of deep profile control using gel particles,the adaptability evaluation of gel particles for deep profile controlling is carried out according to the reservoir characteristics of strong heterogeneity and rich residual oil after long-term water flooding. The evolution process of the pore throat radius during the long-term water injection is quantitatively determined by NMR experiment,and the relationship between the matching factor(δ)and migration-plugging is established based on the quantitative microporous membrane filtration experiment. The deep migration,profile improvement and capability of enhanced oil recovery(EOR)by gel particles are verified by the dynamic physical experiments. The results show that the matching relationship between the gel particle radius and pore throat plays an important role in the depth of deep profile controlling. When δ is between 1.0 and 3.0,the gel particles are the most effective for deep profile controlling. The gel particles can effectively plug the high-permeability layers in the form of retention,adsorption and bridging,and the profile improvement rate of the heterogeneous core can reach 97.2%. The comparison experiment of three-layer heterogeneous core shows that under the best matching relation,the gel particles have good ability of deep migration and plugging,and the recovery factor can be improved up to 29.3%.
Key words:  gel particles  matching factor  deep profile control  fractional flow  EOR

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