Experiment on improving tight sandstone development by combining static and dynamic imbibition

doi:10.3969/j.issn.1006-6535.2025.05.015

Abstract

Abstract: In response to the unclear production characteristics and synergistic mechanisms of static and dynamic imbibition on micro-pores,nuclear magnetic resonance (NMR) testing technology was employed to conduct static and dynamic core imbibition experiments.Based on the analysis of T₂ spectra before and after core imbibition,the production characteristics of the two imbibition methods on small pores and large pores were studied,the effects of imbibition time,interfacial tension,and permeability on imbibition efficiency were evaluated,and a new method of combined imbibition,static first followed by dynamic,was proposed.The experimental results show that in static imbibition,the recovery degree of small pores (pore diameter:0.002 7-0.368 0 μm) is higher than that of large pores (pore diameter:0.368 0-23.000 0 μm),accounting for more than 58.7% of the produced proportion.The recovery degree of small pores increases with increasing permeability and first increases then decreases with decreasing interfacial tension.In dynamic imbibition,the recovery degree of large pores is higher than that of small pores and is the main contributor to the total recovery factor.With decreasing interfacial tension,the recovery degree of large pores increases,while that of small pores and total pores first increases then decreases.The optimal interfacial tension for dynamic imbibition is lower than that for static imbibition.The combined imbibition method,static first followed by dynamic,can simultaneously and significantly improve the recovery degree of both small and large pores.Practice shows that after the first round of combined static-dynamic imbibition in the pilot test well group,the average daily oil production increase reached 336%,and the average water cut decrease reached 29%,demonstrating significant oil increase and water control effects.This research has strong guiding significance for improving tight oil recovery.

Key words: tight sandstone, static imbibition, dynamic imbibition, nuclear magnetic resonance, micro-pores, interfacial tension

CLC Number:

TE341

WEI Changlin, HAO Hongxun, ZHAO Yufeng, LI Kang, SHI Haifeng, ZHANG Chunhui. Experiment on improving tight sandstone development by combining static and dynamic imbibition[J]. Special Oil & Gas Reservoirs, 2024, 32(5): 129-136.

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