Enhanced Oil Recovery by CO2 Huff-n-Puff in Tight Oil Reservoirs in Mazhong Block，Santanghu Basin

doi:10.7657/XJPG20230508

Abstract

Abstract:

The tight oil reservoirs in the MZ block of the Santanghu basin are characterized by medium-high porosity, ultra-low permeability, and high oil saturation. In the initial development stage, high production rate was achieved by virtue of volume fracturing in horizontal wells, but declined greatly. In the late stage, the reserves were effectively produced through water huff-n-puff. After years of development, the effect of water huff-n-puff became worse. The current recovery percent of reserves is only 5.6%. For further enhancing the oil recovery, CO₂ huff-n-puff experiments were conducted in five horizontal wells. The results show that CO₂ plays a pivotal role in enhancing recovery in tight oil reservoirs through the mechanisms such as swelling, energy augmentation, viscosity reduction, light component extraction, and fluid mobility improvement. The impact of CO₂ varies throughout the injection, soaking, and production stages, leading to alteration in crude oil properties. CO₂ can enhance oil recovery and also demonstrate a high storage rate, offering both economic and social benefits. CO₂ huff-n-puff is adaptable and promising for tight oil reservoir development.

Key words: Santanghu basin, MZ block, tight reservoir, CO₂ huff-n-puff, EOR, oil displacement, storage rate

CLC Number:

TE357

LI Shirui, ZHAO Kai, XU Jiangwei, Murzhaty ASKUR, XU Jinlu, ZHANG Xing. Enhanced Oil Recovery by CO₂ Huff-n-Puff in Tight Oil Reservoirs in Mazhong Block，Santanghu Basin[J]. Xinjiang Petroleum Geology, 2023, 44(5): 572-576.

Figures/Tables 6

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Table 1.

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Enhanced Oil Recovery by CO₂ Huff-n-Puff in Tight Oil Reservoirs in Mazhong Block，Santanghu Basin

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