چكيده به لاتين
Nowadays, due to the reduction of oil resources, the need to increase recovery from oil reservoirs is a basic need in the oil and gas industry, but due to the high price of different methods of EOR, smart water flooding was proposed. This method is environmentally friendly and it is the best method for areas that have access to huge water resources such as sea, ocean, or even rivers. When injected water is used at any stage of the reservoir, including pressure stabilization, EOR, acidizing, drilling operations, hydraulic fracturing, or well drilling, it will merge with the reservoir water and due to the different salinity of the two water samples, scale formed. As a result of this water incompatibility, the scale can form in the reservoir and ultimately have the opposite result, so that the deposits can even cause the reservoir to be completely blocked. Another problem with injected water is the disturbance of the thermodynamic balance that the water has on the surface and when it is injected with increasing pressure and especially temperature, it causes scale especially in the injected tubes. In this research to solve the problem that was created in one of the fields west of Karun, for injecting water to Huralazim; The type and amount of scale in both static and dynamic states have been investigated. In the first stage, in the static test, several different water samples were used next to the formation water. In each stage, the scale weight and type of each scale were examined by different analyzes of XRD, XRF, SEM, and the type of scales was determined. The results indicate that sulfate group scales are predominant scales that have high adhesion and hardness. Then, in order to calculate the reduction of porosity and identify the location of sediments, a dynamic experiment was designed. In these experiments, brine water and Hur al-Azim were injected in two different patterns of micromodels. In one, the decrease in porosity was calculated using the code written in MATLAB. In the last stage of the research, the optimization of injected water was investigated by two methods of diluting injected water and changing the pH of the water using NaOH, in order to minimize the amount of scale and finally to investigate the feasibility of making water without scales in laboratory conditions.
