Laboratory Experiments and Field Tests of CO2 Near-Miscible Flooding for Medium-Viscosity Oil in NJH Block, Santanghu Oilfield

doi:10.7657/XJPG20250114

Abstract

Abstract:

The NJH block of the Santanghu oilfield features sandstone reservoirs containing medium-viscosity oil, with crude oil viscosity of 20.8 mPa·s. The reservoir is at medium water cut stage, with a predicted waterflood recovery factor of 22.70%, leaving a limited potential for further enhanced oil recovery. To figure out an applicable enhanced oil recovery (EOR) technique, laboratory experiments and field test were conducted on CO₂ near-miscible flooding for medium-viscosity oil to understand the mass transfer patterns and EOR mechanisms of this technique, thereby determining its feasibility. The research results show that the front of the CO₂ flooding mainly plays a swelling effect, and the rear exerts a stronger extraction effect than the front. Reducing the viscosity and improving the remaining oil displacement efficiency are the main stimulation mechanisms. The viscosity of surface crude oil reduced by 55%, the content of C₂-C₁₅ components increased by 18.3%, and the displacement efficiency improved by 4.6 times. Permeability ratio is found to be the primary factor influencing swept volume, with a permeability ratio of 6, leading to a recovery factor of only 13.84% in low-permeability layers. During the field test, the cumulative injected gas volume is 2.66×10⁴ t, cumulative oil production is 0.78×10⁴ t, and oil exchange ratio is 0.29, confirming a promising application of CO₂ near-miscible flooding for medium-viscosity oil.

Key words: Santanghu oilfield, NJH block, medium-viscosity oil, CO₂ flooding, near-miscible flooding, enhanced oil recovery, field test

CLC Number:

PTE348

ZHANG Qi, ZHU Yongxian, HAN Tianhui. Laboratory Experiments and Field Tests of CO₂ Near-Miscible Flooding for Medium-Viscosity Oil in NJH Block, Santanghu Oilfield[J]. Xinjiang Petroleum Geology, 2025, 46(1): 114-120.

Figures/Tables 10

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Laboratory Experiments and Field Tests of CO₂ Near-Miscible Flooding for Medium-Viscosity Oil in NJH Block, Santanghu Oilfield

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