DRILL PIPE, COATING SYSTEM AND OIL-FIELD APPLICATION METHOD Russian patent published in 2013 - IPC E21B17/00 F16L58/04 C09K8/54 E21B41/02 

FIELD: mining.

SUBSTANCE: drill pipe includes a polymer basic structure formed of bismaleimide polymer reinforced with fibres; and a hydrophobic coating including a maleimide complex and chemically connected to polymer basic structure. The coating forms a covalent link with polymer basic structure. A drill pipe erection method involves erection of the basic structure of the drill pipe from polymer material; production of hydrophobic coating; and creation of covalent chemical link between the coating and the basic structure. The coating for application onto the drill pipe is made of many layers, at least one of which is made from the material containing a chemical reagent chosen for a reaction in presence of borehole fluid media that have destructive nature in relation to polymer material.

EFFECT: providing formation of a coating on the drill pipe, which is adequately connected to the below-lying basic structure of the polymer material so that it can withstand corrosive medium present in the borehole application.

30 cl, 10 dwg