Simulation and Prediction of Gas Injection Strategy for the Bakken Formation in Southeast Saskatchewan

doi:10.11885/j.issn.1674-5086.2021.03.14.01

Abstract

Abstract: The Bakken formation is an extremely tight oil reservoir with characteristics of low porosity and permeability. In this study, a ten-well numerical simulation model was built by using the reservoir and fracture properties of middle Bakken tight formation to represent the characteristics of the Viewfield pool in southeast Saskatchewan. Pilot tests have been carried out to determine the reliability and feasibility of gas injection for improving tight oil recovery. To begin with, a history matching has been performed to verify the validity of the existing model with the actual field production data and pressure variation within the pilot area and determine the sensitivity of parameters. Meanwhile, this study has different recovery schemes such as the water flooding process, CO₂ flooding process, CO₂-water-alternating-gas (WAG) process, and methane flooding process were simulated to comparatively evaluate their respective effects on oil recovery. It was found that relative oil-water permeability (K_row) and connate water saturation (S_wcon) were the most sensitive parameters towards the cumulative oil productions. The simulation results indicated other important parameters which considerably affect the oil recovery factor are CO₂ injection rate, number of cycles, injection times and soaking time. Amidst the different injection methods, 2-year period of CO₂-WAG has the best performance in terms of oil recovery factor, which brings up the additional oil recovery factor to 5.033%. This work provides fundamental knowledge of evaluating the potential gas injection strategies and the optimum operating conditions for enhancing the recovery of southeast Saskatchewan tight oil formation.

Key words: Bakken Formations, unconventional reservoirs, numerical simulation, CO₂ flooding, CO₂-WAG

CLC Number:

TE155

DENG Xiaohan, CHEN Tian, ZHAO Jia, JIA Na. Simulation and Prediction of Gas Injection Strategy for the Bakken Formation in Southeast Saskatchewan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 104-112.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2021.03.14.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I5/104

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