Finite Element Analysis on the Static Intensity and Dynamic Characteristics of Drilling Rig Derricks

Drilling rig derrick is one of the most important equipment in hoist system of oilfield, which can be used to install crown block and hang tackle, hoisting hook and special tools, and also complete manipulations such as making a trip, casing running and so on. The static intensity and dynamic properties of derricks are the main parameters determining the safety of drilling rig derricks. A finite element model based on the non-linear beam element was built in this paper. The static stress and dynamic characteristics of the derricks was calculating by using FEM software ANSYS. Furthermore, optimization method and stability calculating method are using to improve the structural load-carrying capability of derricks. Results indicated that the load-carrying capability and stability of optimal structures have been improved greatly. It can give constructive guidance to structure design of derrick and safety production in oilfield.