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Investigation of gravity influence on EOR and co.(2) geological storage based on pore-scale simulation

petroleum Science 2024年第2期21卷 987-1001页

作者： Yong-Mao Hao Gui-Cheng Wu Zong-Fa Li Zhong-Hui Wu Yong-Quan Sun Ran Liu Xing-Xing Li Bo-Xin Pang Nan Li Key Laboratory of Unco.ventional Oil&Gas development(China University of petroleum(East China)) Ministry of EducationQingdao266580ShandongChina School of petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina School of petroleum Engineering Yangtze UniversityWuhan430100HubeiChina dongsheng jinggong petroleum development group co. LtdShengli Oilfield CompanySINOPECDongying257001ShandongChina

Gravity assistance is a critical factor influencing co.(2)-Oil mixing and miscible flow during EOR and co.(2)geological *** on the Navier-Stokes equation,co.ponent mass co.servation equation,and fluid property-co.position relationship,a mathematical model for pore-scale co.(2) injection in oilsaturated porous media was developed in this *** model can reflect the effects of gravity assistance,co.ponent diffusion,fluid density variation,and velocity change on EOR and co.(2) *** nonhomogeneous porous media,the gravity influence and large density difference help to minimize the velocity difference between the main flow path and the surrounding area,thus improving the oil reco.ery and co.(2) *** co.(2) injection angles and oil-co.(2) density differences can increase the oil reco.ery by 22.6% and 4.2%,respectively,and increase co.(2) storage by 37.9% and 4.7%,*** diffusion facilitates the transportation of the oil co.ponents from the low-velocity region to the main flow path,thereby reducing the oil/co.(2) co.centration difference within the porous *** diffusion can increase oil reco.ery and co.(2) storage by 5.7% and 6.9%,*** addition,co.bined with the co.ponent diffusion,a low co.(2) injection rate creates a more uniform spatial distribution of the oil/co.(2) co.ponent,resulting in increases of 9.5% oil reco.ery and 15.7% co.(2) storage,*** study provides theoretical support for improving the geological co.(2) storage and EOR processes.

关键词： Gravity Flow simulation co.(2)-oil mixing Enhanced oil reco.ery(EOR) Geological storage

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Investigation of influence factors on co.(2) flowback characteristics and optimization of flowback parameters during co.(2) dry fracturing in tight gas reservoirs

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petroleum Science 2023年第6期20卷 3553-3566页

作者： Xiao-Mei Zhou Lei Li Yong-Quan Sun Ran Liu Ying-Chun Guo Yong-Mao Hao Yu-Liang Su National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina School of petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Shengli Oil Field dongsheng jinggong petroleum development(group)Stock co. Ltd.Dongying257000ShandongChina Exploration and development Research Institute of Shengli Oilfield co.pany SinopecDongying257000ShandongChina

co.(2) dry fracturing is a promising alternative method to water fracturing in tight gas reservoirs,especially in water-scarce areas such as the Loess *** co.(2) flowback efficiency is a critical factor that affects the final gas production ***,there have been few studies focusing on the flowback characteristics after co.(2) dry *** this study,an extensive co.e-to-field scale study was co.ducted to investigate co.(2) flowback characteristics and CH_(4) production ***,to investigate the impact of co.e properties and production co.ditions on co.(2) flowback,a series of laboratory experiments at the co.e scale were ***,the key factors affecting the flowback were analyzed using the grey co.relation method based on field ***,taking the co.struction parameters of Well S60 as an example,a dual-permeability model was used to characterize the different seepage fields in the matrix and fracture for tight gas *** production parameters after co.(2) dry fracturing were then *** results demonstrate that co.(2) dry fracturing is more effective than slickwater fracturing,with a 9.2%increase in CH_(4) *** increase in co.e permeability plays a positive role in improving CH_(4) production and co.(2) *** soaking process is mainly affected by co.(2) diffusion,and the soaking time should be co.trolled within 12 *** the flowback pressure gradient results in a significant increase in both CH_(4) reco.ery and co.(2) flowback ***,an increase in co.(2) injection is not co.ducive to CH_(4) production and co.(2) *** on the experimental and field data,the important factors affecting flowback and production were co.prehensively and effectively *** results show that permeability is the most important factor,followed by porosity and effective *** flowback efficiency and the influence of proppant reflux,the injection volume should

关键词： co.(2)fracturing Tight gas reservoir Fracturing fluid flowback Parameter optimization

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