RU2006125379A - DEVICE FOR INSTALLING A CEMENT BRIDGE - Google Patents

Claims (1)

A device for installing a cement bridge comprising a pipe with through radial holes in the middle part, an upper sleeve rigidly connected to the pipe in the upper part, a shoe rigidly connected to the lower part of the pipe, having an internal flushing hole, a coaxial pipe, and a conical outer surface in the lower parts armed with a spiky blade, made with a landing seat under the throw ball, and a lower sleeve located above the shoe with the possibility of axial movement along the nozzle, and the lower one on top The upper sleeve and the upper surface of the lower sleeve form an annular gap, the generators of which are in the form of a lateral surface of a truncated round straight cone, a coaxial nozzle, with an apex below the level of the annular gap, the inner surfaces of the upper and lower bushings and the outer surface of the nozzle corresponding to them form an annular cavity hydraulically connected to the cavity of the nozzle through the through radial holes, characterized in that the nozzle in the lower part further has through radial cylindrical skie hole, wherein the through radial holes middle section also tube are cylindrical and are arranged in staggered rows, the number of which is determined by the formula

where n is the number of rows of through radial cylindrical holes of the middle part of the pipe; δ - openness of the annular gap, m; d is the outer diameter of the annular gap, m; n ₁ is the number of through radial cylindrical holes in a row equal to n ₁ = 2, 4, 6 ...; d ₁ - the outer diameter of the pipe in the middle part, m; M - torque transmitted from the pipe string to the armament of the device, Nm; [τ] - permissible torsional stress, determined by reference data, Pa; d ₂ - the inner diameter of the pipe in the middle part, m, moreover, the lower edge of the through radial cylindrical holes of the lower row is located above the level of the annular gap to a height selected from the condition h≥d ₃ -d ₁ , where h is the height of the lower row of through radial cylindrical holes relative to the level of the annular gap, m; d ₃ - the inner diameter of the upper sleeve, m, and on the outer surface of the pipe above the level of the upper row of through radial cylindrical holes of its middle part, an annular thrust protrusion is formed on which an element that controls the opening of the annular gap is located, while the shoe in the upper part has an internal groove in which the lower part fixed by a pin relative to the shoe is located the lower sleeve, with the formation of the discharge chamber at the base of the internal groove hydraulically connected to the cavity of the pipe through the through radial cylindrical holes in its lower part, and the pike-shaped blade has a “Г” -shaped cut that divides it into two parts at the apex of mating faces, the through longitudinal part of which is offset relative to the axis of the device towards the incident face of one part, and the transverse one is a groove, made in the opposite direction from the offset on the rear face of the other part, while the part of the blade in the place of the transverse part of the cutout in longitudinal section has the shape of a trapezoid.