The effect of wettability alteration of carbonate rock using cetyltrimethyl ammonium bromide on acidizing with HCl 15%

Articles in Press

Document Type : Research Paper

Authors

1 Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

2 Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, 14115-143, Iran

Abstract

Most of the reservoirs in Iran are carbonate reservoirs that spend the second half of their life and need acid stimulation processes for better production rate. Acidizing is one of the well and reservoir stimulation methods, which is used to increase oil and gas production from the fields due to its cost and efficiency. Acidizing of carbonate reservoirs is usually done in three stages: pre-flush, main acidizing, and post-flush. The pre-flush fluid is used to change the wettability of the rock from oil-wetting to water-wetting. In this work, we look for the optimal pre-flush fluid using CTAB surfactant to improve the acidizing process. At first, the porosity test is taken from the carbonate cores and then acidized using HCl 15 wt%. Then the contact angle test is performed to determine the optimal concentration of surfactant and the optimal time. Finally, the cores that we put in contact with the pre-flush fluid were placed in the vicinity of the acidic solution to determine the effectiveness of the pre-flush fluid. CTAB surfactant solution with a concentration of 500 ppm in sea water and a duration of 120 minutes was able to reduce the contact angle from 125 to 42.574 and determined as the optimal pre-flush fluid. Also, the combination of 15 wt% HCl with sea water had the best performance.

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Journal of Chemical and Petroleum Engineering

Articles in Press, Accepted Manuscript
Available Online from 10 March 2025

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History

  • Receive Date: 08 January 2025
  • Revise Date: 19 February 2025
  • Accept Date: 10 February 2025

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