STRESS-STRAIN CONDITION OF A SPHERICAL VALVE IN A DRILLING WELL
UDC: 539.373
DOI: 10.33285/1999-6934-2021-2(122)-43-47
Authors:
LOGINOV YURIY NIKOLAEVICH1,2,
ZAMARAEVA YULIYA VALENTINOVNA1,2
1 Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation
2 M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russian Federation
Keywords: well; dissolving metal; ball valve; magnesium; stresses; deformations
Annotation:
It is noted that in the oil production practice, the balls act as valves that temporarily block wells and self-dissolve under the influence of drilling fluids. The purpose of the work is to simulate the operating conditions of the ball used in the well shut-off valve device. The boundary conditions of the ball valve operation are described. The boundary value problem is formulated for various ratios of the ball and saddle diameters. The results of the solution are presented in the form of the distribution of the degrees of deformation and average stresses. It is concluded that in the initial state of operation under an operational pressure, the ball may be plastically deformed in the valve seat, but at the same time retain its operability. With the ball diameter decrease due to its dissolution, the level of plastic deformation increases in the place of its contact with the valve seat. When the critical size is reached, the ball is pushed through and the well is opened. At a liquid pressure of 40 MPa, in the most loaded part of the ball the average stress in the metal can reach –470 MPa.
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