Scaling Prevention on Wells of Tarasovskoe Field

摘要

Tarasovskoe oil and gas condensate field is located in the Purovskii district of the Yamal-Nenets Autonomous District of the Tyumen Region, 55 km north of Tarko-Sale town and 45 km east of Gubkinskii town. One of the main drawbacks of the existing field development system is a large stock of non-operating wells. The utilization rate of the production well stock at the field is 0.71, the rate of the injection well stock - 0.64, which leads to an oil production decline, and, resulted in deformation of the developed system, prolonged underutilization leads to significant losses in the ORI value. The main task is the struggle with scaling. At the Tarasovskoe field, the most urgent task is to reduce the risks of scaling, optimize the technologies used, and select priorities in the use of the latest technologies for the prevention of scaling. The main source of salt extraction is water extracted together with oil. The scaling process is directly connected with a significant oversaturation of the aqueous medium with difficultly soluble salts due to changes in the physicochemical parameters of the oil production system (temperature, pressure, gas evolution, concentration of precipitating ions, etc.). The chemical composition of production waters as oil reserves are constantly changing, which causes the diversity and time variability of the salt deposits composition. Forced fluid withdrawal, which is associated with the deepening and temperature increase in the ESP zone, lowering the bottomhole pressure and intensive degassing of well fluids, affects the intensity of salt deposition at different sites from bottom to bottom of the well, at submersible borehole pumps. In addition, the deposition of salts in the bottomhole formation zone leads to an increase in the skin factor, and therefore becomes a reason for the decrease in oil production in production wells. In this regard, the choice of optimal options for the prevention of scaling, taking into account the features of the operation of wells in specific fields, is extremely important for effective oil production.