METHOD AND APPARATUS FOR DETERMINING FLOW RATE OF FLUSHING LIQUID AT OUTLET OF DRILLED WELL Russian patent published in 2016 - IPC E21B21/08 

FIELD: mining.

SUBSTANCE: invention relates to drilling wells and can be used when monitoring circulation system. Method is based on measuring changes in sensor signal, taking into account output stream of flushing liquid flowing through trough which is in form of two pivotally interconnected parts - fixed and movable measured force created by weight of drilling fluid flowing through movable end of chute mounted beneath its bottom force transducer that converts an electrical signal by an algorithm. When drilling in stable geologic downhole conditions - first mode when flow rates of washing liquid inlet and outlet hole are equal, and well outlet of its density exceeds density of inlet due to saturation of washing liquid products face destruction define added density of washing liquid. Device comprises a chute in two parts - fixed and movable, pivotally interconnected. End of the movable part is moveable vertically under action of weight changing flowing washing liquid. Measurement of said displacement is carried out with force sensor installed at bottom of movable part of trough on bracket and connected to fixed part of the trough. Information in form of electrical signals is transmitted to electronic unit, which processes sensor signals according to algorithms for computing corresponding flow of washing liquid with different modes defined geological conditions of bottom. Force sensor can be mounted at different distances from end of movable part of trough.

EFFECT: higher accuracy of determining flow rate.

6 cl, 1 dwg