Calculating the polymer operating string under asymmetric ice compression in permafrost


ISSN 0536-1028 (Print)              ISSN 2686-9853 (Online)  
УДК 622.245.1 DOI: 10.21440/0536-1028-2021-8-15-23




Research objective is to determine the results of ice impact on the polymer operating string and adjacent rock mass in the most probable type of computational model that considers the asymmetry of the load imposed by water refreezing in the casing string annulus. The solution to this problem makes it possible to consider the possibility of using polymer pipes in permafrost.
Research relevance is conditioned by the known facts of water freezing in the casing string annulus at low temperatures. In practice, water freezing causes significant deformations and damage operating strings and pipe joints creating emergency situations that can disrupt flow processes.
Research methods. The finite element method is used to calculate the polymer operating string, placed in the rock mass. The proposed method considers the asymmetry of the load imposed on the pipe and uses a lot of parameters to create the computational model. The method makes it possible to include pipe, ice and adjacent rock mass in the computational model considering their properties.
Research results establish the degree of non-uniform loading effect on pipe’s deformation, strength and stability. Pipe calculation results for the conditions of symmetric and asymmetric compression by ice are compared. The results of using a nonlinear model of rock are considered. A significant impact of the composition of rocks around the well has been revealed. The conditions have been determined in which polymer pipes can bear the load during refreezing under asymmetric arrangement of the pipe in the well.

Keywords: ice compression; refreezing; permafrost; well; operating string; loading asymmetry



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