Analysis of Wellhead Collision in Offshore Extended Reach Well Drilling

Guohai ZHAO


In order to solve the problem of wellhead equipment damage caused by vibration, impact and eccentric wear of wellhead drill string in the process of offshore extended reach well drilling, the finite element method is used to simulate and calculate the load state and deformation of cantilever beam of drilling platform under different working conditions, and the deformation is converted into wellhead offset according to the geometric relationship of position, so as to analyze the influence of wellhead deviation on eccentric wear of drill string; Based on the mechanical analysis of the drill string, the lateral force and casing wear of the wellhead are quantitatively analyzed. Taking an extended reach well in Chenghai as an example, the problem of wellhead drill string collision is analyzed. The theoretical analysis method of wellhead collision is helpful to guide the drilling operation of offshore extended reach wells.


Wellhead impact; Lateral force; Casing wear; Cantilever beam; Offshore drilling platform

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