Izvorni znanstveni članak

https://doi.org/10.17559/TV-20251023003085

Modelling and Analysis of Wellbore Pressure Behaviour During Fixed-Valve Fishing in Thermal Recovery Wells

Zhuoran Li ; Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing, Heilongjiang 163318, China *

* Dopisni autor.

Sažetak

In fishing operations in thermal recovery wells, downhole throttle valves are often involved, altering the flow path of the injected fluid and leading to complex wellbore pressure interactions. To study these effects, this research established a coupled annulus-throttle valve-tubing flow model and conducted numerical simulations incorporating detailed valve geometry and turbulence characteristics. The results show that the pressure drop across the throttle valve is strongly dependent on flow rate and roughly proportional to the square of the injection rate. When the flow rate increases from 4 t/h to 10 t/h, the pressure drop rises from 1.00 MPa to 5.75 MPa, significantly increasing the required wellhead injection pressure. However, the influence of formation pressure is minimal; for every 2 MPa increase in formation pressure, the wellhead pressure changes by only 0.06 MPa. This coupled model elucidates the mechanism controlling the wellbore pressure distribution during fixed-valve fishing, providing a quantitative basis for selecting injection parameters and ensuring operational safety in thermal recovery wells.

Ključne riječi

diversion effect; fishing technology; throttle valve; wellbore pressure drop

Hrčak ID:

348702

URI

https://hrcak.srce.hr/348702

Datum izdavanja:

30.6.2026.

Posjeta: 0 *