BOREHOLE CLEANOUT AT DRILLING OF ITS HORIZONTAL SECTIONS AND DRILLING PIPE TO THIS END Russian patent published in 2016 - IPC E21B37/00 E21B21/00 

FIELD: mining.

SUBSTANCE: flushing fluid flow is created at drilling in a hole clearance by the activation of its helical motion by the pipe spinning energy. Note here that slime fallout and slime particles outflow to the hole clearance top cross-section are effected by the centrifugal forces of the activated helical flushing fluid flow in the hole clearance. The pipe outer helical surface is equipped with three activators of helical motion. The said activators are made integral with the pipe body arranged at equal angular spacings over its outer surface and shaped in the cross-section to hemispherical profiles. Each of the latter is composed of a helical bearing belt at its vertex with the bearing profile aligned with the borehole horizontal sections profile. Note here that the activator hemispherical profile radius of the appropriate pipe in the hole clearance is defined by the design.

EFFECT: higher efficiency of borehole cleaning.

2 cl, 9 dwg