Test and Application of Regenerative Nitrogen Foam Flooding in Low-Permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2022.06.013

Abstract

Abstract: The conventional nitrogen foam is difficult to re-foam after defoaming in the formation, which severely restricts the effect of foam flooding, laboratory tests were conducted to select an economical and efficient regenerative nitrogen foam flooding formulation system in terms of foaming capacity, re-foaming performance, salt resistance and temperature resistance and pressure resistance with a multi-factor evaluation method. One-dimensional core displacement test was conducted under simulated reservoir conditions to confirm the feasibility of regenerative foam and select the reasonable injection parameters: the gas-liquid ratio was 3∶1, the injection rate was 0.3-0.4 mL/min, and the gas and liquid were injected simultaneously. Pilot tests were conducted in two well clusters in SN well block, Xinjiang Oilfield. The regenerative nitrogen foam plug of 0.43 times of pore volume was injected cumulatively, and the daily oil increase was more than 8 t/d, and the water cut of the well cluster decreased by 6.6 percentage points. In the subsequent water flooding, the oil production was enhanced by re-foaming to 4 947 t, and the input-output ratio reached 1.0∶1.6. It is found in the study that regenerative nitrogen foam flooding can effectively improve the oil production and recovery, with important application potential in similar reservoirs.

Key words: Low-permeability reservoir, regenerative foam, foam flooding, enhanced oil recovery, laboratory test, field application

CLC Number:

TE357.46

Cheng Hongjie, Chen Yukun, Li Tieshuan, Zhang Hanqing, Zhang Jipeng, Wu Yongbin. Test and Application of Regenerative Nitrogen Foam Flooding in Low-Permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(6): 104-110.

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