STATORS FOR DOWNHOLE MOTORS, METHODS OF THEIR PRODUCTION AND DOWNHOLE MOTORS WITH THEM Russian patent published in 2017 - IPC E21B4/02 F01C1/10 

FIELD: mining.

SUBSTANCE: group of inventions relates to drilling. Method of producing a stator for a downhole motor containing a stator tube including an inner surface and having a set of splines extending inward from the inner surface; a stator insert made from a hardened reinforcing material with a high degree of crystallization, which is located in the inner surface and arranged along the set of splines, herewith the stator insert has an inner surface forming an internal spiral cavity including a set of internal screw teeth; and a rotor arranged in the stator, wherein the method includes: providing the stator tube; applying a separating composition on the outer surface of the spindle; arrangement of the spindle in the stator tube, herewith the spindle has an outer geometry complementary to the required internal geometry of the stator; introduction of the reinforcing material into the stator tube to fill the space between the spindle and the stator tube inner surface; hardening of the reinforcing material; and extraction of at least part of the spindle from the stator tube with the hardened reinforcing material; thus, obtaining the stator.

EFFECT: provided are improved mechanical properties of the stator.

19 cl, 22 dwg