Evaluation of the effectiveness of mixing hydrochloric acid and organic acid as stimulation fluids in a tight gas carbonate reservoir

Matrix acidizing is a widely used technique in carbonate formations to improve production and injection rates by restoring or improving permeability. This study evaluates the stimulation efficacy of organic and inorganic acid combinations in the Sarajeh carbonate formation, with a focus on improving...

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Bibliographic Details
Published in:Canadian journal of chemical engineering 2024-09, Vol.102 (9), p.3103-3118
Main Authors: Khaleghi, Mohammad Reza, Khamehchi, Ehsan, Abbasi, Amirhossein, Kalatehno, Javad Mahdavi
Format: Article
Language:English
Subjects:
carbonate reservoirs
Continuous flow
Effectiveness
Fluid flow
Gas formation
Hydrochloric acid
Hydrogen chloride
Inorganic acids
matrix acidizing
Mixtures
organic acids
Permeability
Reservoirs
Sarajeh carbonate formation
Solubility
Stimulation
stimulation fluids
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Summary:Matrix acidizing is a widely used technique in carbonate formations to improve production and injection rates by restoring or improving permeability. This study evaluates the stimulation efficacy of organic and inorganic acid combinations in the Sarajeh carbonate formation, with a focus on improving permeability within this potential tight gas formation. Through solubility and continuous flow tests, a mixture of HCl 7.5% + HAc 2.5% was found to significantly outperform the traditional HCl 15% solution. The HCl 7.5% + HAc 2.5% mixture had a solubility rate of 59.27% and improved permeability by 4.4 times compared to HCl 15%, indicating a higher dissolving capacity. The results of continuous flow tests showed that the mixed acid had the best pore volume to breakthrough (PVBt) value of 2.574 at a controlled injection rate of 2 cc/min. This study demonstrates the superior performance of a lower concentration HCl‐HAc acid formulation in matrix acidizing carbonate formations and confirms its potential as a more effective alternative to high concentration HCl treatments for the Sarajeh reservoir.
ISSN:0008-4034
1939-019X
DOI:10.1002/cjce.25251