Experimental Study on the Optimization of CO 2 Displacement and Huff-n-Puff Parameters in the Conglomerate Reservoirs of the Xinjiang Oilfield

Hong Tuo, Baoxing Liang, Qixiang Wang, Jianghua Yue, Long Tan, Yilong Li (), Hao Yang () and Zhan Meng
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Hong Tuo: Experimental Testing Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Baoxing Liang: Experimental Testing Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Qixiang Wang: Experimental Testing Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Jianghua Yue: Experimental Testing Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Long Tan: Experimental Testing Research Institute, Xinjiang Oilfield Company, CNPC, Karamay 834000, China
Yilong Li: State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Hao Yang: State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Zhan Meng: State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Energies, 2024, vol. 17, issue 17, 1-13

Abstract: Addressing the issue of poor water injection development effectiveness caused by strong water sensitivity damage in the conglomerate reservoirs of the Xinjiang Oilfield, this paper carries out experimental research on CO 2 displacement and CO 2 huff-n-puff to improve oil recovery in reservoirs under the conditions of reservoirs (86 °C, 44 MPa) by using a high-temperature and high-pressure large physical modeling repulsion device based on the artificial large-scale physical modeling of conglomerate oil reservoirs in the Xinjiang oilfield. The results showed that at any displacement rate, CO 2 displacement exhibits the trend where oil production initially increases and then decreases. The higher the gas injection rate, the higher the initial oil well production, and the shorter the time it takes for CO 2 to break through to the bottom of the well. After a breakthrough, production declines more rapidly. The oil recovery rate varies with different gas injection rates, initially increasing and then decreasing as the injection rate changes. The highest oil recovery rate was observed at an injection rate of 1.5 mL/min (equivalent to 38 t/d in the field). The efficiency of CO 2 displacement with multiple injection-production cycles is low; on the same scale of gas injection, single-cycle injection and production were more effective than multiple-cycle injection and production. CO 2 huff-n-puff can improve oil recovery, with a higher CO 2 injection pressure and a longer shut-in time leading to greater oil recovery. As the shut-in time increases, the efficiency of CO 2 oil exchange also improves. The strong supply capacity of the large physical model results in a tendency for the oil production curves of multiple huff-n-puff cycles to converge.

Keywords: conglomerate reservoir; large-scale physical model; CO 2 displacement; CO 2 huff-n-puff; enhanced oil recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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