SCREW DOWNHOLE MOTOR STATOR Russian patent published in 2009 - IPC E21B4/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to drilling oil and gas wells, particularly, to screw-type downhole motors used in the construction of wells. The proposed stator comprises hollow housing (1) accommodating thin-wall shaped enclosure (2) with its profile (3) representing helical teeth. Elastomer coat (4) is attached to the inner surface of aforesaid shaped enclosure (2). The latter is fitted with a gap on the inner surface (6) of the stator hollow housing. Note that rigid element (5) is fitted in the recesses of shaped enclosure (2).

EFFECT: higher reliability, protection against possible motor parts failure caused by possible abnormal increase in torque.

2 cl, 3 dwg