DOWNHOLE MOTOR SPINDLE Russian patent published in 2006 - IPC E21B4/02 

FIELD: oil and gas well drilling with the use of downhole motors.

SUBSTANCE: spindle comprises body, hollow shaft with lower and upper sealing units, as well as lower and upper axial bearings fastened to it. Spindle also has oil lubricator installed in oil bath, high-pressure crankcase having interior divided into cavities by pistons. One cavity is communicated with oil bath, another one is connected with high-pressure chamber filled with flushing liquid. Oil lubricator is of diaphragm type and is connected to the high-pressure chamber by hydraulic communication channel defined by inner spindle body surface and outer rotor assembly surface. Rotor assembly has diaphragm lubricator, high-pressure crankcase, upper radial bearing and upper sealing unit connected one to another over outer surfaces thereof. Oil chamber of high-pressure crankcase is created to discharge oil from the oil chamber of upper radial bearing and connected with it by reducing valve installed in high-pressure crankcase body lid. The second chamber of high-pressure crankcase is communicated with hydraulic communication channel.

EFFECT: increased motor service life.

2 dwg