Experimental investigation on migration and retention mechanisms of elastic gel particles(EGPs)in pore-throats using multidimensional visualized models

作     者：Yi-Fei Liu Chen-Wei Zou Xu-Guang Lou Ming-Wei Gao Guang Zhao Ming-Wei Zhao Cai-Li Dai 

作者机构：Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum(East China))Qingdao266580PR China Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China))Ministry of EducationQingdao266580PR China China Southern Petroleum Exploration&Development CorporationHaikouHainan570216People's Republic of China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2022年第19卷第5期

页      面：2374-2386页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Key Research and Development Project(2019YFA0708700) the National Natural Science Foundation of China(52104061) the project funded by China Postdoctoral Science Foundation(2020M682264) the Shandong Provincial Natural Science Foundation(ZR2021QE075) the Fundamental Research Funds for the Central Universities(20CX06090A) 

主　　题：Enhanced oil recovery Elastic gel particles Matching coefficient In-depth profile control Pore-throat visualization models 

摘      要：Knowledge of migration and retention mechanisms of elastic gel particles(EGPs)in pore-throats is essential for the effective application of EGPs as a smart sweep improvement and profile control agent for enhanced oil recovery(EOR).The matching coefficient(defined as the ratio of particle size to pore-throat size)is used to investigate its influence on migration,retention and profile control performance of EGPs.A 1-D continuous pore-throat visualization model(PTVM),a 2-D heterogeneous PTVM and a 3-D heterogeneous core model were constructed and used to investigate pore-scale migration,retention and controlling mechanism of migration and retention characteristics on EGPs profile *** results of the 1-D continuous PTVM indicated that while the matching coefficient was in the optimal range(i.e.,0.20-0.32),the EGPs could not only smoothly migrate to the deeper pore-throats,but also form stable retention in the pores to resist the erosion of injected water,which was conducive to the effective indepth profile *** results of the 2-D heterogeneous PTVM verified that the sweep efficiency in low-permeability regions could be significantly improved by in-depth migration and stable retention of EGPs in the pore-throats with an optimal matching coefficient(0.29),which was much better than that in cases with a smaller matching coefficient(0.17)or an excessive matching coefficient(0.39).Moreover,the NMR displacement experiments of 3-D heterogeneous cores were carried out to simulate the EGPs profile control in actual reservoir porous *** images and T2 spectrum curves of crude oil showed that EOR in the low-permeability layer was highest(56.1%)using EGPs profile control with an optimal matching coefficient,attributing to the in-depth migration and stable retention of EGPs.