МОДЕЛЮВАННЯ ГІДРАВЛІЧНИХ ВТРАТ В СВЕРДЛОВИНАХ ПРИ ПРОЄКТУВАННІ ПРОЦЕСІВ ІНТЕНСИФІКАЦІЇ

The work is devoted to the modeling of well stimulation processes using a specialized software package. Well stimulation is a critical stage in improving hydrocarbon production efficiency, where accurate hydraulic calculations play a key role in ensuring operational safety and optimizing technological processes. The study presents an algorithm for calculating hydraulic losses with a detailed description of process features, particularly the application of coiled tubing system. The computational model enables real-time hydraulic calculations and dynamic simulations, incorporating various rheological models such as Newtonian, Power Law, Bingham, and Herschel–Bulkley. Hydraulic loss analysis was performed for fluid injection into the coiled tubing with the diameter Ø44.5 mm and subsequent flow into the annular space between tubing Ø73 mm and coiled tubing Ø44.5 mm. Calculations were carried out for different technological fluids (fresh water and formation water) and under varying coiled tubing wall thickness conditions. The results demonstrate that reducing coiled tubing wall thickness to 3.18 mm ensures minimal hydraulic losses, while the use of formation water increases losses by 5–6 % compared to fresh water due to its higher density. Furthermore, non-uniform coiled tubing geometry (gradual transition from thicker to thinner walls) introduces additional hydraulic resistance compared to constant-wall designs. Obtained results confirm the importance of optimizing tubing geometry and fluid selection to reduce energy consumption and enhance operational efficiency during well intensification.