DEVICE FOR SERIAL OPERATION OF FORMATION OF HORIZONTAL WELL Russian patent published in 2020 - IPC E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to development and operation of oil formations with zones of different permeability and including by means of side horizontal shafts with production columns. Device includes a column with a near, middle and far-end packers. They separate the borehole into the near, middle and far-end sections by means of packers. Valve is arranged between packers. It can be controlled from the wellhead and is made in the form of housing with through holes and axially movable sleeve. Sleeve is made with possibility of opening and closing holes in its extreme positions and has narrowing. Plasters isolate zones of water influx. Valve is installed between the far-end and middle packer. Valve sleeve is equipped with two seats with grooves for fixation of small and large bores, and has side holes. Small bore at central channel shutoff provides possibility under action of pressure shift of valve sleeve and alignment of side holes of sleeve with through holes of housing and opening of connection between middle section and in-tube space. Big bore is provided with the possibility of fixation in the upper part of the sleeve with overlapping of the central channel above side holes. At that, between the near and middle packers the bursting disc is installed, which makes it possible to connect the near section with in-tube space at its rupture.

EFFECT: possibility of involving in development of zone with low permeability with simultaneous isolation of zones of water influx, as well as reduction of time and material costs due to exclusion of necessity to use lifting unit or installation of coiled tubing.

1 cl, 4 dwg