Three-Dimensional Physical Simulation of Horizontal Well Pumping Production and Water Injection Disturbance Assisted CO2 Huff and Puff in Shale Oil Reservoir

In view of the problems of low matrix permeability and low oil recovery in shale reservoirs, CO2 huff and puff technology is considered as an effective method to develop shale oil reservoirs. However, the production behaviors of actual shale reservoirs cannot be reproduced and the EOR potentials can...

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Published in:Energies (Basel) 2022-10, Vol.15 (19), p.7220
Main Authors: Ji, Zemin, Zhao, Jia, Chen, Xinglong, Gao, Yang, Xu, Liang, He, Chang, Ma, Yuanbo, Yao, Chuanjin
Format: Article
Language:English
Subjects:
3D physical simulation
Carbon dioxide
Channeling
CO2 huff and puff
Crude oil
Design
Differential pressure
Disturbance
Dynamic characteristics
Enhanced oil recovery
Experiments
Gases
Horizontal wells
Injection
Oil
Oil recovery
Oil reservoirs
Oil shale
Permeability
Petroleum production
Physical simulation
Pressure
Pumping
pumping production and water injection disturbance
Reservoirs
Shale
shale oil reservoir
Simulation
Technology
Water flooding
Water injection
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Summary:In view of the problems of low matrix permeability and low oil recovery in shale reservoirs, CO2 huff and puff technology is considered as an effective method to develop shale oil reservoirs. However, the production behaviors of actual shale reservoirs cannot be reproduced and the EOR potentials cannot be evaluated directly by scaled models in the laboratory. Conventional CO2 huff and puff has problems such as early gas breakthrough and gas channeling leading to inefficient development. In this article, with the help of a three-dimensional experimental simulation apparatus, a new method of CO2 huff and puff with a horizontal well assisted by pumping production and water injection disturbance is developed. The dynamic characteristic, pressure field distribution of soaking and the enhanced oil recovery effect are comprehensively evaluated. The results show that the soaking stage of CO2 huff and puff can be divided into three stages: differential pressure driving, diffusion driving and dissolution driving. According to the pressure field distribution, after water injection disturbance, the fluctuation boundary and distribution of pressure becomes more stable and uniform and the sweep rate is greatly improved. Water injection disturbance realizes the combination of CO2 injection energy enhancement and water injection energy enhancement and the CO2 injection utilization rate is improved. It has the dual effect of stratum energy increase and economic benefit. The new huff and puff method can increase the oil recovery rate by 7.18% and increase the oil–gas replacement rate to 1.2728, which confirms the potential of horizontal well pumping production and water injection disturbance-assisted CO2 huff and puff technology to improve oil recovery.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15197220