WELLHEAD FLOW DIVIDER Russian patent published in 2023 - IPC E21B37/00 

FIELD: well drilling.

SUBSTANCE: device includes a body made in the form of a sub for drill pipes with the upper, the middle, and the lower radial, pipe, and annular axial channels and longitudinal ports, with poppet and disk check valves, with a sliding sealing element equipped with a pressure regulator against the well wall. The sealing element is installed on a pipe, placed movably with a lip seal on the body with the ability to occupy two positions using a lock and a rotary sleeve with labyrinth grooves: the lower position for direct flushing and the upper position for reverse flushing. The pipe interacts with the valves using cams located in the longitudinal ports of the housing and in a groove along the inner surface of the pipe. In direct flushing, the annular channel is closed with the disk valve, and the pipe channel is opened with the poppet valve. During backwashing, the pipe channel is closed and the annular channel is opened by the disk valve.

EFFECT: ability to repeatedly change the direction of the flow of the flushing fluid without changing the wellhead piping, increased rate of removal without loss of cuttings from the bottom by back-flushing, and increased work efficiency when eliminating complications during drilling or development of horizontal wells.

1 cl, 2 dwg