Three-Dimensional Physical Simulation of Horizontal Well Pumping Production and Water Injection Disturbance Assisted CO 2 Huff and Puff in Shale Oil Reservoir

Zemin Ji, Jia Zhao, Xinglong Chen, Yang Gao, Liang Xu, Chang He, Yuanbo Ma and Chuanjin Yao ()
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Zemin Ji: State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China
Jia Zhao: Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Xinglong Chen: State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China
Yang Gao: Research Institute of Petroleum Exploration and Development of Xinjiang Oil Field, PetroChina, Karamay 834000, China
Liang Xu: Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Chang He: State Key Laboratory of Enhanced Oil Recovery, PetroChina, Beijing 100083, China
Yuanbo Ma: Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Chuanjin Yao: Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China

Energies, 2022, vol. 15, issue 19, 1-14

Abstract: In view of the problems of low matrix permeability and low oil recovery in shale reservoirs, CO 2 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 CO 2 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 CO 2 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 CO 2 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 CO 2 injection energy enhancement and water injection energy enhancement and the CO 2 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 CO 2 huff and puff technology to improve oil recovery.

Keywords: shale oil reservoir; 3D physical simulation; CO 2 huff and puff; pumping production and water injection disturbance; 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: 2022
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