PREDICTING AND MITIGATING INORGANIC SCALE IN IRANIAN FIELD

Abstract

Scale is a production problem that occurs in the water system. The formation of scale occurs due to the incompatibility of the fluid mixture, changes in pressure, temperature, and pH. Generally, scale is formed around perforations, subsurface equipment such as tubing, and on surface production equipment such as wellheads, so that it can result in decreased production rates because the flow of oil from the formation to the surface is hampered. Therefore, it is necessary to make efforts to handle the scale problem, both in the form of preventive and countermeasures when scale deposition has occurred in the field. Preventive measures are preventive measures that can be carried out by using scale control chemicals (scale inhibitors), as well as by maintaining the ionic component of the water that is injected into the well. Through the calculation of the Stiff-Davis and Oddo-Thompson Method, the Scaling Index value is obtained from each scale formed so that it can be seen the types of scales formed in the field. Furthermore, through the Scale Software simulation, the Scaling Index value, the concentration of the formed scale, and the compatibility of the injection water were obtained. Then, through literature studies, the countermeasure that can be taken is using chemical methods, namely acidizing and lowering operating conditions. Keywords: Scale, Scale inhibitor, Scale Software, Water, Countermeasures