Effect of Pore-Throat Structure and Displacement Fluid Type on Relative Permeability in Low-Permeability Sandstone Reservoirs
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Le résumé fourni par la source
Low-permeability sandstone reservoirs are characterized by fine pore-throat structures and strong heterogeneity, leading to complex multiphase flow behavior; since relative permeability curves are highly sensitive to displacement media, they serve as critical parameters for EOR performance and development optimization, yet the coupling between the pore-throat structure and the displacement fluid type remains poorly quantified. This study investigates low-permeability sandstone cores from the strike-slip fault block of the Laojunmiao Oilfield. Based on a petrophysical analysis and a high-pressure mercury intrusion, the cores are classified into four types (X1: medium pores, high permeability; X2: micropores, low permeability; X3: fine pores, relatively homogeneous; X4: fine pores with locally dominant channels), and unsteady-state relative permeability experiments are conducted under water, polymer, and nitrogen flooding. A comprehensive structural index (SI) is proposed to characterize the pore-throat structure and its correlation with the width of the two-phase flow zone. The results show that the pore-throat structure fundamentally governs the water flooding behavior, with Type X2 cores prone to preferential channeling; polymer flooding improves the mobility ratio most prominently in Type X1 and X3 cores; and nitrogen flooding performs best in Type X2 cores by retarding gas fingering. The two-phase flow zone width correlates linearly with the structural parameters, with polymer flooding showing the greatest sensitivity to structural variation.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Effect of Pore-Throat Structure and Displacement Fluid Type on Relative Permeability in Low-Permeability Sandstone Reservoirs
- Date Crossref
- 31/08/2026
- Éditeur
- MDPI AG
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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China University of Petroleum State Key Laboratory of Petroleum Resources and Engineering pays non établi dans la noticeUniversité ou école supérieure
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China National Petroleum Corporation (China) pays non établi dans la noticeEntreprise
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Sinopec (China) pays non établi dans la noticeEntreprise
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Daqing Oilfield General Hospital pays non établi dans la noticeÉtablissement de santé
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PetroChina Yumen Oilfield Company Laojunmiao Oil Production Plant pays non établi dans la noticeEntreprise
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Petroleum Exploration and Production Research Institute pays non établi dans la noticeStructure de recherche
State Key Laboratory of Petroleum Resources and Engineering — China University of Petroleum, China National Petroleum Corporation (China) et Sinopec (China), avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.