High Steep Structure Casing Damage Mechanism And Optimized Design

The seriousness of casing failure has been much attention to all over the world. The seriousness of casing failure has been highly attention to all over the world. A lot of research achievement in casing failure has been gained. On the Basis of esearch achievement and in the case of formation slipping and creeping, the simulation, analyse and design had been done in the thesis aimed at casing failure, As well as how the better choice economy practical casing had carried on the simulation, the analysis and the design in this situation; The casing failure had been researched separately through ANSYS in the thesis, under the situation of the formation slipping and the rock creeping, in this research process through the establishment full-scale mockup, and performs the corresponding load and the constraint condition carries on the simulation, the analysis, in casing failure research process which causes to the formation slipping, uses in ANSYS the contact module to simulate between the casing and the rock mass mutual function effectively, and we had obtained the relations between the stratigraphic dip, the friction coefficient and the casing stress; At the same time we had used the creeping module of ANSYS to calculate the stress, and gained the relations between the stress,the displacement and the time of the creep in the rock mass creep situation; Moreover, in the foundation of analyzed the casing failure, how did the thesis to enhance the collapsing strength of the casing to carry on the design and the analysis effectively; In the fifth chapter of the thesis, we had carried on the collapsing strength theoretical analysis to the double-decked combination casing, and has carried on the example computation, enhanced the collapsing strength to the double-decked combination casing to make the further confirmation effectively.