Design improvement of preventer shear rams
In case of an unexpected increase in the storm during drilling at sea or in other emergency cases, the drill or casing columns are cut off with cutters of pretensioners and sealed wells. The drill string remains in the well and it is kept by the pipe plugs of the pretensioners. Blind rams are fitted with a cutting blade, cutting pipes in the well, allowing blind rams to seal the well. The task was to improve the cross-cutting preventer rams to increase the efficiency of the drill pipe cutting. The proposed modernization of the cutter design makes it possible to cut the drill pipe completely. In her, as in the previous design, the cutting process is the same, but due to the shape of the cutting surfaces there is no pipe bending, but a complete cutting. However, the difference between these structures from foreign is that in the process of cutting the pipe first, its point deformation (puncture) occurs with a cutter. This, in
contrast to other structures, reduces the load at the initial moment of the tube deformation on the hydraulic cylinders of the pre-filter, and therefore, the energy costs for this cutting process are reduced, and the load on other elements of the drive is reduced by the pre-plate layers.Key words: antiviral equipment, plate preventor, cut-off rams, pipe bending, finite-element analysis. To study the cutting process of a drill pipe, a three-dimensional model of the pipe itself and two dies were constructed. The three-dimensional model is created with simplified, since with the increase in the number of elements is complicated as the construction of a network of finite elements, and the calculation process itself continues for a very long time. The results obtained by the simulation model show the effectiveness of the cutting of the drill pipe and the possibility of complete closure of the pre-cutter with cross-sections.
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