SECTIONALISATION DEVICE OF STATORS OF SCREW DOWNHOLE MOTOR Russian patent published in 2010 - IPC E21B4/02 

FIELD: oil and gas industry.

SUBSTANCE: sectionalisation device of stators of screw downhole motor includes drive and driven nipples with through channel and with end teeth made on adjacent edges to interact between each other, coupling installed on nipples in order to be connected by means of right-hand thread to drive nipple and by means of left-hand adjusting thread to driven nipple; at that, axial gap and seals are made on driven nipple between edge of coupling and thrust edge of driven nipple. Device also includes sealing bush installed in through channel of nipples with possibility of restricted axial movement to interact with seals. Nipples are straight and have the number of end teeth, which is not equal to and not divisible by the number of stator teeth. Height of end teeth of nipples and value of axial gap between lower edge of coupling and thrust edge of driven nipple is more than value of pitch of left-hand adjusting thread.

EFFECT: improving reliability, life time and economic efficiency of screw downhole motor, and reducing the costs for well drilling.

2 cl, 6 dwg