Characteristics and Influencing Factors of Dynamic Imbibition at High Temperature and High Pressure in Tight Sandstone Reservoir

doi:10.3969/j.issn.1006-6535.2021.04.020

Abstract

Abstract: In order to solve the problem of low matrix producing degree in the water flooding process of tight sandstone reservoir, waterflood huff-puff and dynamic imbibition core experiments under the action of four typical surfactants were conducted to study the influence of mass fraction of surfactant, displacement speed, injection amount, well shut-in time, permeability and fracture on the dynamic imbibition effect. The results showed that the dynamic imbibition displacement efficiency first increased and then decreased with the acceleration of the displacement speed, and increased with the increase of surfactant mass fraction, injection amount and shut-in time, but the increase of displacement efficiency decreased continuously; the imbibition efficiency under the action of AEO-2 anionic surfactant was the highest and the best injection conditions were 0.3% mass fraction, 0.1 mL/min displacement speed, injection volume of 1.2 times pore volume and 18 h well shut-in; permeability and fracture were positively correlated with dynamic imbibition efficiency; large-scale fracturing by stimulated reservoir volume and acidification stimulation were important factors to improve the dynamic imbibition efficiency. The field test results showed that the average oil production of oil wells was increased by 166% and the average water cut decreased by 25.8% after waterflood huff-puff and dynamic imbibition in oil wells. The effect of increasing oil production and decreasing water cut was remarkable, so the dynamic imbibition has a greater prospect of application and promotion.

Key words: tight sandstone, imbibition characteristics, surfactant, contact angle, influencing factors, Ordos Basin

CLC Number:

TE341

Liu Jizi, Gong Lianhao, Bu Guangping, Wu Xing. Characteristics and Influencing Factors of Dynamic Imbibition at High Temperature and High Pressure in Tight Sandstone Reservoir[J]. Special Oil & Gas Reservoirs, 2021, 28(4): 142-149.

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