DEVICE FOR FIXING OF PIPE STRING WITH DOWNHOLE MOTOR Russian patent published in 2014 - IPC E21B17/03 

FIELD: oil-and-gas industry.

SUBSTANCE: device to fix pipe string with downhole motor comprises pipe string downed via thrust flange in the well casing string. Pipe string is composed of several pipes with screw downhole motor and rock destruction tool at its end. Top pipe of said string features square cross-section and supports two semi-rings with rectangular cutouts at the centre. Said semi-rings are tightened by the flange from above while bushing with cut segment is rigidly fitted between said semi-rings and pipe casing thrust flange. Note here that said bushing is rigidly clamped to semi-rings from above and, from below, to well casing thrust flange. Note here that two-sided mouth sealer is fitted in said thrust flange to seal the space between casing and pipe string. In operation of downhole motor, pipe string can display axially without rotation through the length of pipe casing top tube square cross-section.

EFFECT: ruled out back rotation of pipe string at perception of reaction moment resulted from downhole motor casing, longer life, higher efficiency.

2 dwg