The visual setting of centralizer and the friction simulation of sucker rod string in directional well;

Application of spired stabilizer and collar combination of packed hole anti-deflection drilling tool to well drilling in deep-seated bedrocks;

In consideration of the characteristics of wellbore trajectory in deviated wells, a mathematical model is established for calculating the axial and lateral loads of drill strings in 3 dimensional wellbores of deviated wells, methods are denoted for calculating the space of stabilizers and configuration of sinker bar.

Based on related theory of oil pumping with rod in vertical well and combining with feature of deviating hole track and production feature, mathematic model for calculating load of axis and side direction of rod in three dimensions of deflecting well is created and the method to calculate the space of the stabilizer is provided.

Adding centralizers is the central means to pretect eccentric wear at present.

The deepwater pipe-in-pipe steel catenary riser is comprised of concentric inner and outer pipe,the inner pipe carries the production fluids and is thermal insulated,whilst the outer pipe provides mechanical protection,and the centralizers are spaced at certain intervals over the full length of the riser to prevent the thermal insulation material in the annulus from being crushed.