DYNAMIC BEHAVIOR STUDY OF PERFORATED STRING SYSTEM UNDER IMPACT LOAD

Abstract

In order to assess the safety of perforated string and test equipment under impact load, a dynamic model of the perforated string-shock absorber system is developed using micro-element method. In the model, the perforated string’s weight, actual length and fluid friction are taken into account. The corresponding initial conditions, boundary conditions and difference scheme of the model are given. Using the model, the dynamic behavior of perforated string system in a drilling platform in South China Sea is investigated, based on which the value range of perforated string length, shock absorber stiffness coefficient, shock absorber damping coefficient of shock absorber are proposed. The results of study can provide effective theoretical support for optimal design of perforated string and developing new type of shock absorber