The Mechanical Behavior Analysis For K-derrick And Substructure

Current years, the advantages of K-derrick are accepted by more and more users, self elevating substructure is also replacing others, such as box on box, raised floor substructure and so on. The derrick and substructure in the thesis are made up of K-derrick and self elevating substructure. They have many prominent characteristics. First, K-derrick, posts of substructure and frame can pucker together in order to reduce volume and transport conveniently. In addition, for the sake of moving conveniently and laying masts, K-derrick is designed as openconfiguration. Substructure is just supported by four posts to decrease frames of substructure and infrastructure is widened greatly, reducing the weight and cost. It is helpful for derrick to elevate and its relative height is also increased because of center of gravity in the drilling surface moving back when derrick is elevating. A set of drilling rig can move together and uses less time and less cars. So it is suitable for K-derrick and self elevating substructure to drill in bad environment such as desert, forest, cold place, deep sea and so on.The thesis analyzes load situations of K-derrick and substructure. It is sure that main load situation is drilling situation, according to the basic principal of loads in structure analysis. Drilling situation includes hook load and turnplate beam load. Static analysis of K-derrick and substructure analyze it according to two sorts of loads situations above, considering the worst influence to derrick and substructure.Three-dimension finite element model on the elastic basis is built according to the actual structure of K-derrick and substructure. Two sorts of loads, most hook load and most turnplate beam load, are respectively exerted on the finite element model of drilling rig derrick and substructure. Then, the special finite element software ANSYS9.0 is used for static characteristic calculation and to obtain the stresses and displacements when special loads exerted on they. Analysis indicates that K-derrick and substructure are satisfied by the demands of intensity and rigidity.