Analysis of Jump-Out Loads About Connectors of Buttress and Round Threads of Casing

The finite element models of contact problems about connectors of buttress and round threads of casing were established with the elasto-plastic FEM of ANSYS software. Under the three flank angles 30, 50 and 100 for the buttress casing connector, the curves that the jump-out loads varied with the loading process were obtained. With the three tapers 1/14, 1/16 and 1/17, for the round casing connector, the curves that the jump-out loads varied with the loading process were obtained. At the same time, the jump-out process of the buttress and round thread connectors was studied, respectively. The average jump-out force of the buttress connector is 594.1 ton, and however, the average jump-out force of the round connector is 342.5 ton. That is to say, under the same casing and the same casing size, the connector of the buttress thread is not so easy to jump out, but the connector of the round thread is very easy to jump out. It provides the theoretical supports for the selection of the casing connectors in the extra-deep well and complex well.

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