Numerical Simulation of Asphaltene Precipitation and Deposition during Natural Gas and CO_(2) Injection  

作　　者：Shasha Feng Yi Liao Weixin Liu Jianwen Dai Mingying Xie Li Li 

机构地区：[1]Nanhai East Petroleum Research Institute,Shenzhen Branch of CNOOC Ltd.,Shenzhen,518000,China

出　　处：《Fluid Dynamics & Materials Processing》2024年第2期275-292,共18页流体力学与材料加工（英文）

基　　金：funded by CNOOC Production Research Project(CCL2022SZPS0076).

摘　　要：Asphaltene deposition is a significant problem during gas injection processes,as it can block the porous medium,the wellbore,and the involved facilities,significantly impacting reservoir productivity and ultimate oil recovery.Only a few studies have investigated the numerical modeling of this potential effect in porous media.This study focuses on asphaltene deposition due to natural gas and CO_(2) injection.Predictions of the effect of gas injection on asphaltene deposition behavior have been made using a 3D numerical simulation model.The results indicate that the injection of natural gas exacerbates asphaltene deposition,leading to a significant reduction in permeability near the injection well and throughout the reservoir.This reduction in permeability strongly affects the ability of gas toflow through the reservoir,resulting in an improvement of the displacement front.The displacement effi-ciency of the injection gas process increases by up to 1.40%when gas is injected at 5500 psi,compared to the scenario where the asphaltene model is not considered.CO_(2) injection leads to a miscible process with crude oil,extracting light and intermediate components,which intensifies asphaltene precipitation and increases the viscosity of the remaining crude oil,ultimately reducing the recovery rate.

关 键 词：Reservoir simulation asphaltenes deposition natural gas injection CO_(2)injection 

分 类 号：TE64[石油与天然气工程—油气加工工程]