A Study on Performance of O-Shaped Seal Ring in LWD Device Using Finite Element Analysis

The severe operating conditions required Logging While Drilling (LWD) devices to withstand the high temperatures and pressures. And the seal capability is one of the most important factors to determine the performance and reliability of LWD device directly. O-shaped seal ring is generally used for mechanical sealing in most LWD devices. To precisely predict the behavior of O-shaped seal ring, in this paper, a Finite Element Analysis (FEA) method is proposed to expose the stress and strain of O-shaped seal ring worked under rigorous conditions. An analysis model, which considers all parts are non-rigid components, is established and the contact balance equation is presented. By using ANSYS, the stress distribution and the deformation of O-shaped seal ring is analyzed and a test case is given.Copyright © 2011 by ASME