RU176207U1 - Milling tool - Google Patents

Abstract

The utility model relates to drilling equipment, in particular to a cutting tool used in conjunction with a deflecting wedge, and can be used to open a “window” in the casing and drill a new hole into the well. A milling tool for cutting a window in a well casing comprises a hollow body with a flushing channel along the axis, a cutting part with cutting plates fixed therein, and an expanding part, the cutting plates fixed in the cutting part and forming the surface of the cut-out window in the casing, are located concentric with respect to the central longitudinal axis of the hollow body. The hollow body is made integral, with through flushing holes in the cutting part, while the cone-shaped part is made between the cutting part of the milling cutter and the milling part expanding to deflect the cutting part of the milling cutter, and on the cutting and expanding parts, as well as on the end of the cutting part, blades are made with cutting coating of drill alloy, in addition, the cutting inserts of the cutting part are made of hard alloy. According to a utility model, cutting inserts of a cutting part are made of VK8 alloy; drill alloy is a composite bar made of chipped tungsten-cobalt hard alloy, which is filled with solder on a nickel basis. An increase in the milling speed is achieved by preventing the cutter from cutting into the wedge and, accordingly, increasing the cutting efficiency. 1 ill.

Description

The utility model relates to drilling equipment, in particular to a cutting tool used in conjunction with a deflecting wedge, and can be used to open a “window” in the casing and drill a new hole into the well.

Known milling tools made in the form of a cutter for cutting a window in a casing in a borehole and comprising a hollow body in which a flushing channel is made along the axis of the cutter and flushing holes in the side, end and side blade working surfaces coated with a wear-resistant cutting-abrasive coating while the lower end part is made in the form of a cone with flushing holes and channels dividing the end into sectors, the lower conical end part goes into a conical blade middle part be less taper, and the upper part of the housing has a cylindrical shape with spiral blades which become the tapered middle portion (RU Patent No. 123447, IPC E 21 B 29/06, publ. 27.12.2012 g).

A disadvantage of the known milling cutter is that this tool in the process of cutting into the casing, moving the working surfaces along the wedge-diverter, significantly mills the latter. This circumstance leads to an increase in the resistance moment during milling, and also reduces the length of the resulting “window”.

Close in technical essence is a milling tool for cutting a window in the casing of a well, containing a cut-in, straight-through and calibrating milling-ribs with fixed cutting plates therein, a notching and straight-through milling-riber is made in the form of a hollow body, a calibrating milling-riber is fixed on the floor to the shaft, cutting inserts fixed in the notch milling cutter-riber and forming the surface of the cut-out window in the casing are arranged concentrically with respect to the central longitudinal axis of the hollow shaft; stays fixed in the passage and calibrating milling cutters-ribs and forming the surface of the cut-out window in the casing are arranged with the same eccentricity and opposite on opposite sides relative to the central longitudinal axis of the hollow shaft, the body of the calibrating milling cutter-riber is made with screw channels, the hollow body of the notch and passage milling ribs is made with screw channels for a through milling-riber, while the cutting plates fixed in the through milling-riber and forming the surface of the cut the windows in the casing, as well as the cutting plates fixed in the calibrating milling cutter-riber and forming the surface of the cut-out window in the casing, are located along the central longitudinal axis of the hollow shaft and are fixed in the longitudinal grooves of the screw blades formed by the above-mentioned screw channels, and the screw blades of the passage and respectively calibrating milling-riber with fixed cutting inserts each made with a transverse chip breaking groove, characterized in that the housing of the calibrating milling-riber The blade, the hollow shaft of the calibrating milling cutter-riber, and the hollow body of the cut-in and feed-through milling cutters-rippers are made in the form of a single hollow skeleton, while the sum of the maximum eccentricities of the cutting plates fixed in the longitudinal grooves of the screw blades of the calibrating and, respectively, through milling cutters-ribs forming the surface of the window in the casing pipe, is equal to the difference between the radii of the cutting inserts of the calibrating and straight-through milling cutters-ribers relative to their own longitudinal central axes located opposite on different sides relative to the central longitudinal axis of a single hollow core (patent RU 2499882, IPC ЕВВ 29/06, publ. November 27, 2013).

The disadvantage of the prototype is the presence of cutting inserts in the passage and calibrating milling-ribs, which increases the wear of the deflecting wedge and leads to an increase in the moment of resistance, and the presence of three milling-ribs equipped with cutting inserts increases the complexity of the repair.

The objective of the utility model is to increase cutting efficiency.

The technical result is an increase in the milling speed by preventing the cutter from cutting into the wedge.

The problem is solved, and the technical result is achieved by a milling tool for cutting a window in the casing of the well, containing a hollow body with a flushing channel along the axis, a cutting part with cutting plates fixed in it, and an expanding part, and cutting plates fixed in the cutting part and forming the surface of the cut-out window in the casing is arranged concentrically relative to the central longitudinal axis of the hollow body, characterized in that the hollow body is made whole, with through flushing from with holes in the cut-in part, while on the case a cone-shaped part is made between the cut-out part of the milling cutter and the expanding part for deflecting the cut-out part of the milling cutter from the wedge, and on the cut-out and expanding parts, as well as at the end of the cut-in part, blades are made with a cutting coating of a drill alloy, which represents it is a composite bar made of chipped tungsten-cobalt hard alloy cast with solder on a nickel basis, in addition, the cutting inserts of the notched part are made of VK8 alloy.

The technical result is achieved as follows.

The presence of a deflecting cone-shaped part on the milling cutter body and the absence of carbide inserts on the expanding part prevent the milling of the milling cutter into the wedge, which increases the milling speed and reduces the time needed to cut the window.

The essence of the utility model is illustrated in the drawing, which shows the inventive milling tool.

The tool contains:

1 - conical part

2 - cutting part

3 - extension part

4 - blades with a cutting coating of drill alloy

5 - carbide cutting inserts.

Milling tool works as follows.

Using a shear screw, the milling cutter is mounted on a deflector wedge (not shown), then the whole arrangement is transported to the window cut-out point. After orienting and installing the deflector wedge, the shear screw is cut. Then the milling of the column begins. The milling tool, rotating, moves along the deflecting wedge (not shown) with opening the window in the casing. At the same time, at the initial stage of cutting, the milling tool with its conical part (1) moves along the plate mounted on the deflector wedge (not shown), which excludes the milling cutter touching the wedge and leads to an early start of opening the window and a decrease in torque. After passing through the cone-shaped part of the wedge deflecting plate, the latter is cut off by the expanding part (3) of the milling cutter. Next, the expanding part of the milling cutter moves along the “spoon” of the wedge. During the milling process, the cutting elements of the blast alloy of the blades (4) are chipped, forming sharp edges, thereby ensuring self-sharpening. The used bursploy, the configuration of the blades, as well as the presence of the cutting inserts 5 lead to the appearance of large chips during milling of the casing string, which indicates a more efficient cutting process. Next, the chips are removed from the cutting zone by the washing liquid entering through the washing channels. The presence of a deflecting cone-shaped part 1 on the mill body, the absence of carbide inserts on the expanding part 3 prevents the milling of the milling cutter into the wedge, which increases the milling speed and reduces the time for cutting the window.

Thus, an increase in the milling speed is achieved by preventing the cutter from cutting into the wedge and, accordingly, increasing the cutting efficiency.

Claims (1)

A milling tool for cutting a window in a casing of a well, comprising a hollow body with a flushing channel along the axis, a cutting part with cutting plates fixed therein, and an expanding part, the cutting plates fixed in the cutting part and forming the surface of the cut-out window in the casing, arranged concentrically with respect to the central longitudinal axis of the hollow body, characterized in that the hollow body is made whole, with through flushing holes in the cutting part, while on the body is made and the cone-shaped part between the cutter part of the milling cutter and the expanding part for deflecting the cutter part of the milling cutter from the wedge, and on the cut-out and expanding parts, as well as at the end of the cut-out part, blades are made with a cutting coating of drill alloy, which is a composite bar made of chipped tungsten-cobalt solid an alloy poured with solder on a nickel basis, in addition, the cutting inserts of the notch part are made of VK8 alloy.

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