In the placement of centralizers on casing, it is necessary to integrate information on hole trajectory, casing properties, and centralizer performance. This paper summarizes the basic theory and algorithms for optimizing centralizer spacing based on these considerations. The algorithm predicts the wall forces in a three-dimensional (3D) borehole.
Although centralizer placement is important in all wells, it is especially important for highly deviated boreholes and deep, heavy strings. With the detailed approach described here, centralizer placement design gives the operator greater confidence in the prediction of minimum standoff distance for these types of wells.
Some examples of field applications are presented. Also, cementing results from field wells support the conclusion that good cement placement is obtained when adequate centralizers are used.