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Experimental Investigation of Optimum Acid Injection Rate for Matrix Acidizing in Carbonate Reservoir

Ahmadizadeh, Mansour | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 49154 (66)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ayatollahi, Shahabeddin; Ghotbi, Sirous
  7. Abstract:
  8. Matrix acidizing as a well stimulation technique is performed to increase the production index by increasing the permeability and removing the formation damage in the near wellbore region. However, several challenges such as corrosion of the tubulars and iron precipitation in the formation are hindering this process. To encounter these challenges, different chemicals, or additives, such as corrosion inhibitors and iron control agents are added to the acid solution. Carbonate acidizing has been carried out using HCl-based stimulation fluids for decades. However, at high temperatures, HCl does not produce satisfactory results because of its fast reaction, acid penetration, and hence surface dissolution, and its high corrosion rate. Therefore, alternatives to HCl have been proposed including organic acids and emulsified acid. This research work is aimed to investigate different injection rates, interstitial velocities, acid types and temperature on optimum injection rate through coreflood tests. During the course of this experimental work, the optimum injection rate in dolomite core samples was measured. It was found that in the low interstitial velocity lower than 2.5cm/min, the emulsified acid has better performance compared to HCl and synthetic acid. In moderate interstitial velocity near 2.5cm/min and higher, the synthetic acid showed better results. Also the optimum injection rate and optimum interstitial velocity for each acid type were investigated. The optimum injection rate of the HCl and synthetic acid was determined to be 4.5 cm3/min; while for the emulsified acid, it was found to be 2 cm3/min. This study summarizes the results obtained from extensive experimental work which conclude that the use of the synthetic acid and emulsified acid for field applications in carbonate reservoirs is permitted
  9. Keywords:
  10. Acidizing Treatment ; Carbonate Resrevoirs ; Experimental Investigation ; Optimum Injection Rate

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