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Compatibility Analysis of the Acid Injected into the Carbonate Formations With Crude-oil, Formation Water and Acid Additives Through Solid-Liquid Thermodynamics Calculation
Najmedini, Mohammad Reza | 2017
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 50452 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Ghotbi, Sirous; Bazargan, Mohammad
- Abstract:
- Formation acidizing is one of the best well stimulation methods to remove reservoir damage and improve recovery of oil and gas well. The proper design of acidizing operations can significantly improve the production of a formation. In the meantime, causing formation damage and precipitation in oil flowlines, which may be caused by the incompatibility of the stimulation fluid with the reservoir fluid and rocks, is one of the most serious problems in the operation, which reduces permeability and oil/gas production. As a result, the success of the acidizing operation requires to study the interaction of components of operation (acid, reservoir water, formation rock, and acid additive) carefully. Since the provision of all of these materials in the laboratory and the empirical test is time-consuming and costly, it is easy to study the interactions of these components by thermodynamic and geochemical modeling and examine the potential of various mineral deposits under different conditions. In this paper, a new numerical algorithm is proposed for solving the chemical equilibrium system. The results of this algorithm are compared with the results of a geochemical modeling software (PHREEQC) and laboratory data. In this study, it was also shown that in the acidizing operations of reservoirs face a serious problem of precipitation of sulfate minerals, as well as iron minerals. In the following, the effects of stimulation fluid supplements on sediment control, increasing the efficiency of acidizing operations by varying the concentration of the additive and also the calcium sulfate minerals in the acidic environment have been studied. The purpose of this study was to investigate the thermodynamic equilibrium (geochemistry) of the reservoir acidizing system and to investigate the potential of precipitation in this system, developing a new numerical method for the study of geochemical processes that could be used in the future as a native software package in modeling of environmental processes, especially in oil reservoir studies
- Keywords:
- Thermodynamic Modeling ; Precipitation ; Acid Additives ; Chemical Equilibrium ; Acidizing Treatment ; Carbonate Resrevoirs ; Reservoirs Acidizing ; Geochemical Modeling
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