Title: Optimisation of technological parameters for coupled liquid CO₂ fracturing-huff and puff treatment in tight oil reservoirs

Authors: Bo Xiao; Tingxue Jiang; Baoping Lu

Addresses: Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China ' Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China ' Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China

Abstract: Coupled liquid CO₂ fracturing-huff and puff (CCFHP) treatment is combination of CO₂ stimulation and CO₂ EOR, aiming to maximise the productivity of tight oil reservoirs. In this work, we develop analytical procedures and methods to analyse technological parameters during CCHFP treatment. Several parameters, such as fracture length, fracture conductivity, fracture spacing, CO₂ injection volume, soaking time, bottom hole flowing pressure (BHFP) are studied. Compositional numerical model is employed to simulate the flow process and interaction between CO₂ and oil in reservoir. Orthogonal analysis method is then utilised to analyse the sensitivity of technological parameters and optimisation is implemented accordingly. The results show that the production rate of coupled liquid CO₂ fracturing-huff and puff treatment is better than both CO₂ fracturing treatment and CO₂ huff and puff treatment. The research has valuable guiding significance for design and optimisation of field operation.

Keywords: CCFHP treatment; optimisation; parameters; tight oil.

DOI: 10.1504/IJOGCT.2021.114856

International Journal of Oil, Gas and Coal Technology, 2021 Vol.27 No.1, pp.1 - 13

Accepted: 27 Jan 2020
Published online: 10 May 2021 *

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