Research On Tubular Collapse Mechanism By Computer

Tubular collapses are already international general problems and tubular collapses speed is increasing with years. For many years, domestic and foreign oilfield, scientific institution, colleges and universities have done masses of work on tubular collapse mechanism, and have summarized some tubular collapse mechanism scientific payoffs. But there are still a lot of problems to solve.In this paper, the sustainability and deformation of external pressure on tubulars are analyzed and imitated by using the finite element software ANSYS. The main work of this paper are as follows.1. Finite element model of ideal tubular is established, stress field and displacement field of ideal tubular under uniform pressure or non-uniform pressure are analyzed. By observing displacement-load curve, we can see that the deformation increases slowly at the beginning until the maximum pressure (collapse pressure) is reached, and then a decrease in the pressure is observed with a large increase in the deformation. Tubular's collapse pressure under non-uniform pressure is much lower than its collapse pressure under uniform pressure. That is why so many tubulars are destroyed.2. Finite element model of eccentric tubular is established, stress field and displacement field of eccentric tubular under uniform pressure are analyzed. By observing displacement-load curve, significant reduction in the collapse pressure of a tubular occurs when a small eccentricity is introduced. Eccentricity increases while tubular collapse pressure decreases.3. Finite element model of ellipse tubular is established, stress field and displacement field of ellipse tubular under uniform pressure are analyzed. By observing displacement-load curve, significant reduction in the collapse pressure of a tubular occurs when a small ovality is introduced. Ovality increases while tubular collapse pressure decreases.This work proved to have important academic merit and practical value on directing tubular designs and protection of tubular collapse.?...