Technical aspects of effective centering of casing strings
DOI:
https://doi.org/10.31471/1993-9868-2025-2(44)-55-69Keywords:
well; casing string; cementing; centralizer; degree of centering; concentricity; annular.Abstract
The article is devoted to the study of factors that determine the effective centering of casing strings in wells which include: the type of well, the geometric parameters of well, the casing string running depth and the length of casing centering interval; the intensity of the well deviation. The parameters of casing string should also be taken into account: the diameter of casing, the wall thickness; length of the casing string and grade of casing, and parameters of fluids in the well: density of drilling and cementing fluids, friction coefficient, consestivity of solids (abrasive) particles in the drilling fluid, thixotropic properties of fluid. The casing running process is significantly affected by the casing running speed, and the degree of replacement of drilling fluid with cement fluid is affected by the rotation and axial movement of casing string. It is necessary to take into account the data of the caliper log and inclination log, the graduation of hole temperature, the intervals of formations containing aggressive environments, and the interaction of the «centralizer device-rocks» system. Notice that centralizers must meet strict complexity of the requirements. Considered their design features, advantages and disadvantages of various types of centralizers: bow-spring, rigid, semi-rigid, mold-on and their purpose. The number of centralizersand their installiation sections should be justified based on the minimum number of casing sag points in the well ortheir complete absence. Nowadays is a trend in the manufacture of centralizers towards improving their design and using new, innovative combinations of materials and alloys with a low friction coefficient, which improves their functionality. The written work proposes a method for calculating the resistance force created by the strength bars of centralizer and calculation value for various types of rigid centralizers: RC 114/146-165-1; RC 146/222-251-1; RC 194/245-270-1; RC 351/445-490-1. The several important conclusions were made based on the results of calculations: increasing the size of centralizer leads to increasing the drag force; the resistance force depends on the geometric parameters of rigid bars and their number; increasing the friction coefficient (μ) from 0.2 to 0.3 leads to a significant increase in the resistance force for each centralizer (increase to ~25%).
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