鄂尔多斯盆地红河油田长8储层致密砂岩油藏注CO2提高采收率

doi:10.11743/ogg20160217

Abstract

Abstract: The Honghe oilfield in Ordos Basin has difficulty achieving effective development due to low formation pressure, quick production decline and low recovery efficiency during natural depletion.In addition, natural fractures are well developed in Chang 8 tight sandstone reservoir, making it difficult to carry out waterflooding due to serious water channeling and low efficiency.Various CO₂-EOR experiments including PVT, minimum miscible pressure and CO₂ flooding in fractured cores were performed to determine the feasibility of maintaining reservoir pressure via CO₂ injection.The performance of CO₂ puff-huff was also eveluated.The results show that the crude oil of Honghe oilfield swells significantly after CO₂ injection.The diffusion between crude oil and CO₂ gradually increased as the pressure grows.The measured miscible pressure of crude oil and CO₂ is 17.34 MPa, lower than the initial formation pressure of Honghe oilfield, indicating that miscible flooding of CO₂ is feasible.Multi-cycle CO₂ huff-puff experiments show that an additional oil recovery factor of 3.14% can be achieved on the basis of 4.04% of natural depletion.A comprehensive evaluation of the experiment results indicates that CO₂ injection is feasible in Chang 8 reservoir of Honghe oilfield.

Key words: CO₂ huff-puff, complement producing energy, enhance oil recovery, tight sandstone, Yanchang Formation, Ordos Basin

CLC Number:

TE357

Zhang Benyan, Dang Wenbin, Wang Shaopeng, He Xuewen. CO₂-EOR in Chang 8 tight sandstone reservoir of Honghe oilfield in Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 272-275.

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CO₂-EOR in Chang 8 tight sandstone reservoir of Honghe oilfield in Ordos Basin

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CO2-EOR in Chang 8 tight sandstone reservoir of Honghe oilfield in Ordos Basin

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CO₂-EOR in Chang 8 tight sandstone reservoir of Honghe oilfield in Ordos Basin