AUTOMATIC DRILLING PRACTICE WITH CONSTANT PARAMETER OF CONTROL OF PRESSURE DERIVATIVE Russian patent published in 2011 - IPC E21B44/06 E21B7/04 

FIELD: oil and gas production.

SUBSTANCE: versions of practice implementation consist in maintaining constant efficiency at drilling with device of horizontal-directed drilling. The device is equipped with a pump of axial thrust. Further, the versions consists in measurement of pressure of hydro-system working fluid in one or several pumps of a horizontal-directed drilling device, in comparison of measurements of working fluid pressure of hydro-system with alternative pressure limit, in calculation of value of derivative with derivative threshold, in decreasing alternate limit of pressure when value of derivative exceeds derivative threshold, also, value of decrease of alternate limit of pressure is based on one or several measurements of pressure of hydro-system working fluid, in reduction of output of the axial thrust pump, when comparison of measurement of pressure of hydro-system working fluid indicates, that one or several measurements of working fluid pressure exceed alternate pressure limit.

EFFECT: automatic control of axial thrust functions of retracting and rotation.

15 cl, 13 dwg