Spacing configuration calculation method of sucker rod centralizer in three dimensional hole

Sucker rod centralizer is very effective to reduce the impact of rod and tubing wear, but at present there is no a good method to design spacing configuration of centralize. Most wells are configured with experience, lacking of support of theory to guide. In this paper, based on the parameters of the actual borehole, considering the stress and bending conditions of rod in three-dimensional space, axial load and lateral load is analyzed in details. According to the basic principle that sucker rod’s horizontal deformation is equal to the annular clearance between tubing and sucker rod, the placement distance of sucker rod centralizer is calculated. The implementation method is studied based on the above theory, and corresponding computer program is established. The example of the calculation shows that the method is feasible and can be tested and applied to oilfields.