FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil and gas industry, particularly, to cementing of large-diameter pipes casing strings through drill pipe on oil and gas wells. Device comprises shoe assembly, docking tool and top cementing plug. Shoe assembly includes housing with cement sleeve with the seating sleeve and check valve with throttle. Docking tool comprises rod with sealing elements. In middle part of rod there are circulation radial holes. Rod lower part is equipped with thrust for squeezing plug setting. Rod docking tool is equipped with casing and damper spring. Damping spring is located above casing. Casing is fixed on rod with shear screw in position, covering sealing elements. Inside rod there is suspended sleeve locked with a shear screw to shut off said circulation radial holes. Squeezing plug in lower part has sealing elements and grooves for fixation.
EFFECT: technical result is increasing of string cementing quality and simplification of process operations during cementing of strings.
1 cl, 3 dwg
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