CO2 Huff-n-Puff and Storage Test in Extra-High Water Cut Stage in Shanshan Oilfield

doi:10.7657/XJPG20230309

Abstract

Abstract:

Based on the pilot test of the CO₂ huff-n-puff well group in the Shanshan oilfield, the injection-production performance and the factors influencing CO₂ EOR and storage in high water cut stage in low-permeability and low-viscosity oilfields were analyzed. The results show that, in the Shanshan oilfield (medium-deep burial reservoirs), the injected CO₂ stays in a supercritical state, and the characteristics of CO₂ injection are similar to those of water injection, showing the problems of uneven vertical sweep and planar breakthrough. The CO₂ huff-n-puff can be divided into three stages: transient gas flowback, oil enhancement, and gradual invalidation. Three huff-n-puff wells vary greatly in oil replacement rate, indicating that the EOR effect mainly affected by the degree of remaining oil enrichment. The main mechanisms of CO₂ storage are dissolution and mineralization, and the simultaneous storage rate can reach as high as 95.6%.

Key words: Shanshan oilfield, extra-high water cut stage, CO₂ huff-n-puff, CO₂ EOR, storage, oil displacement rate, storage rate, mechanism, economic benefit

CLC Number:

TE341

LI Yanming, LIU Jing, ZHANG Peng, GONG Xuecheng, MA Jianhong. CO₂ Huff-n-Puff and Storage Test in Extra-High Water Cut Stage in Shanshan Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(3): 327-333.

Figures/Tables 8

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CO₂ Huff-n-Puff and Storage Test in Extra-High Water Cut Stage in Shanshan Oilfield

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