Analysis of the channeling of water injection in low permeability reservoirs with interlayer considering the seepage–stress coupling

Abstract

Purpose This paper aims to establish a mathematical model for water-flooding considering the impact of fluid–solid coupling to describe the process of development for a low-permeability reservoir. The numerical simulation method was used to analyze the process of injected water channeling into the interlayer. Design/methodology/approach Some typical cores including the sandstone and the mudstone were selected to test the permeability and the stress sensitivity, and some curves of the permeability varying with the stress for the cores were obtained to demonstrate the sensitivity of the formation. Based on the experimental results and the software Eclipse and Abaqus, the main injection parameters to reduce the amount of the injected water in flowing into the interlayer were simulated. Findings The results indicate that the permeability of the mudstone is more sensitive to the stress than sandstone. The injection rate can be as high as possible on the condition that no crack is activated or a new fracture is created in the development. For the B82 block of Daqing oilfield, the suggested pressure of the production pressure should be around 1–3MPa, this pressure must be gradually reached to get a higher efficiency of water injection and avoid damaging the casing. Originality/value This work is beneficial to ensure stable production and provide technical support to the production of low permeability reservoirs containing an interlayer.

Guest editorial

“…After comprehensive peer review, only one third papers qualified for acceptance for final publication. This special issue comprises the theoretical and experimental research articles that elucidate the research efforts and recent developments on “New Trends in Heat and Fluid Flow: Applications and Recent Developments.” This issue consists of (Agrawal et al , 2021; Akbari et al , 2021; Alanazi et al , 2021; Alkanhal, 2021; Chang et al , 2021; Chen et al , 2021; Dehghan et al , 2021; Hayat et al , 2021; Riaz et al , 2021; Saadun et al , 2021; Safdari Shadloo, 2020; Selimefendigil and Öztop, 2021; Ullah et al , 2021; Xing et al , 2021; Yilmaz, 2021; Youjun et al , 2020; Zaher et al , 2021; Zhang et al , 2020) accepted papers related to fluid dynamics; heat exchangers; heat transfer enhancement; heat and mass transfer in thermal energy; heat and mass transfer in porous media; heat transfer phenomena in biological systems; nanofluids; two-phase/multiphase flows; Newtonian and non-Newtonian fluids; thermodynamics; and numerical simulations and methods. The presented results are discussed with an adequate physical interpretation.…”

Research on organic polyacid system suitable for water injection wells in low permeability reservoirs

“…In order to form a deep pore, the reaction rate should be reduced. Hydrochloric acid is the most commonly used acid for acidizing carbonate reservoirs due to its high solvency capacity, but two factors limit its use: fast reaction rate and severe corrosion of the facility [7][8][9]. In general, a recommended remedy is to use emulsified acid, where hydrochloric acid is mixed with crude oil to create a higher carbonate reservoir stimulation efficiency [10].…”