DOWNHOLE TOOL FOR FLUID MEDIUM CIRCULATION IN WELL SHAFT, CIRCULATION SYSTEM OF FLUID MEDIUM IN WELL SHAFT AND CIRCULATION METHOD OF FLUID MEDIUM IN WELL SHAFT (VERSIONS) Russian patent published in 2012 - IPC E21B21/10 E21B34/06 

FIELD: oil and gas industry.

SUBSTANCE: borehole circulation adapter or valve includes tubular housing having external hole and valve piston installed with possibility of sliding inside the housing. Primary fluid medium flow trajectory passes through internal delivery orifice of the housing and valve piston. In the first position the valve piston covers the external opening for decoupling with fluid medium between internal delivery orifice and annular gap of well shaft. In the second position the valve piston moves to lock the internal delivery orifice and connect the external opening to internal opening and to establish the connection by means of fluid medium between internal delivery orifice and annular gap of the well. Dividing mechanism is fixed between the housing and valve piston for direction of movement of valve piston between the first and the second positions. In the versions of the implementation the dividing mechanism includes turning element.

EFFECT: random fluid medium circulation inside the well shaft, possibility of continuous operation of the valve and reduction of the valve stroke.

24 cl, 13 dwg