RU176205U1 - Milling cutter - 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 cutter using a deflecting wedge comprises a hollow body with a flushing channel along the axis of the cutter, through flushing holes in the cutting part of the body made at an angle to the axis of the cutter, the upper part of the body being cylindrical and the side of a variable cross section in the form of a polyhedron, on which the cutting elements are fixed, while the side and end working cutting surfaces of the casing are coated with a wear-resistant coating layer, and the lower end surface of the casing is made with cutting elements, and the cutting b the casing surfaces are made in the form of a continuously-stepped system with a gentle transition of one cutting part to another and with a layer of a wear-resistant cutting-abrasive coating continuously applied to these surfaces, and the cutting-abrasive surfaces of the side and end parts of the housing are reinforced with cutting elements rigidly fixed in longitudinal grooves made in the steps of the cutting edges, the cutting elements are in the form of a flat irregular trapezoid. The casing is connected by a one-piece connection to the sub, through flushing holes for supplying flushing fluid are made on the side and end parts of the cutter equipped with blades having a rectangular cross section and covered with a cutting coating of drill alloy, and the end part of the body is made in the form of a cone with blades converging in the center end parts of the cutter, which are reinforced with carbide cutting inserts mounted and sealed in grooves. According to a utility model, a drill alloy is a composite bar made of chipped tungsten-cobalt hard alloy, which is filled with solder on a nickel basis. The application of the utility model provides an increase in the milling speed due to better removal of sludge and the passage of the "zero point". 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 is a milling cutter for cutting a “window” in a casing string in a borehole and further drilling a long pocket, including a hollow body in which a flushing channel is made along the milling axis, the lower part has spiral blades armed with diamond-containing plates, smoothly transitioning from the end face to the conical with a radius the side part, with the subsequent transition to the cylindrical part, on which additional spiral-shaped blades are made, equipped with a wear-resistant cutting-abrasive coating (patent RU 131410, MP E 21 B 29/00, publ. 20.08.2013 city).

A disadvantage of the known milling cutter is that this tool contains diamond-containing plates, which tend to chip during operation, which leads to a sharp decrease in the efficiency of the tool, and also leads to a noticeable increase in the cost of tool repair.

Closest to the claimed one is a milling cutter using a deflector wedge containing a hollow body with a flushing channel along the mill axis, through flushing holes in the cutting part of the body made at an angle to the mill axis, the upper part of the body is made of cylindrical shape, and the side part is of variable cross section in the form of a polyhedron, the faces of which in cross section have the shape of an irregular trapezoid, on which the cutting elements are fixed, the side and end working cutting surfaces of the body are covered with a wear-resistant coating layer, n The lower end surface of the housing is made with cutting elements and has longitudinal continuous grooves between the side working surfaces. The body is made one-piece, tapering downward, the cutting side surfaces are made in the form of a continuously-stepped system with a gentle transition of one cutting part to another and with a layer of a wear-resistant cutting-abrasive coating continuously applied to these surfaces with at least two steps, cutting-abrasive surfaces of the side and the end parts of the housing are reinforced with cutting elements rigidly fixed in longitudinal grooves made in the steps of the cutting edges formed at the transition from cylindrical to conical For cutting surfaces, the cutting elements are in the form of a flat segment of a circle or a flat irregular trapezoid, continuous longitudinal grooves between the lateral working surfaces are made at an angle of 2 ° ± 0.2 in the horizontal and 5 ° ± 0.2 in the vertical planes to the axis of the body (patent RU 103564 , IPC Е21В 29/06, published on 04/20/2011).

The disadvantage of the prototype is the flat shape of the end part, which impairs the removal of cutting products, and can also lead to a "freeze" of the tool when passing the "zero point". Another disadvantage of the prototype is the lack of flushing holes on the end of the tool, which affects the removal of cutting products.

The objective of the utility model is to increase the efficiency of the process of cutting the window in the casing.

The technical result is an increase in the milling speed due to better removal of sludge and the passage of the "zero point".

The problem is solved, and the technical result is achieved by a milling cutter with the possibility of fixing on a wedge-deflector, containing a hollow body with a washing channel along the axis of the cutter, through washing holes in the cutting part of the body, made at an angle to the axis of the cutter, and the upper part of the body is made of cylindrical shape, and lateral - of variable cross section in the form of a polyhedron on which the cutting elements are fixed, while the lower end surface of the housing is made with cutting elements, and the cutting and abrasive surfaces of the side and tsevoy housing parts are reinforced cutting elements rigidly fixed in longitudinal grooves formed in the steps of cutting edges, the cutting elements are in the form of irregular flat trapezoid. Unlike the prototype, the casing is connected inseparably to the sub, through flushing holes for supplying flushing fluid are made on the side and end parts of the cutter equipped with blades having a rectangular cross section and covered with a cutting coating of drill alloy, which is a composite bar made of chipped tungsten-cobalt solid alloy, which is filled with solder on a Nickel basis, and the end part of the body is made in the form of a cone with blades converging in the center of the end the second part of the cutter, which reinforced carbide inserts mounted and sealed in the grooves.

The technical result is achieved as follows. The end part of the body is made in the form of a cone with blades converging in the center of the end part of the cutter, which leads to better removal of sludge, better passage of the "zero point" and, in turn, to increase the milling speed.

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

The cutter contains:

1 - sub

2 - case

3 - one-piece connection between the sub and the housing

4 - flushing holes

5 - blades

6 - carbide cutting inserts

7 - drilling alloy coating

8 - end part of the cutter

9 - side of the cutter.

The mill contains a hollow body 2 with a flushing channel (not shown) along the axis of the cutter, through flushing holes 4 in the cutting part of the body, made at an angle to the axis of the cutter. The casing is connected by an integral connection 3 to the sub 1, through flushing holes 4 for supplying flushing fluid are made on the side 9 and end 8 of the cutter equipped with blades 5 having a rectangular cross section and covered with a cutting coating 7 of a drill alloy, which is a composite bar made of chipped tungsten-cobalt hard alloy, which is filled with solder on a nickel basis. Moreover, the end part 8 is made in the form of a cone with blades 5 converging in the center of the end part of the cutter, which are reinforced with carbide cutting inserts 6 mounted and sealed in grooves.

The mill 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. The tool has an axial channel (not shown) through which pressurized flushing fluid is supplied. Through the flushing holes 4, as well as the holes in the end part of the cutter, the liquid comes out to cool the carbide particles of the cutting-abrasive coating on the side 9 and end 8 parts, to remove waste, “products” of cutting during the formation of the window in the casing wall, from the cutting elements 6. The milling cutter, rotating, moves along the deflecting wedge (not shown) with opening the window in the casing. At the initial stage of the column milling, the side part 9 with a gentle transition comes into operation, equipped with carbide inserts 6. During the milling process, the cutting elements of the burst alloy 7 on the blades 5 are chipped, forming sharp edges, thus ensuring self-sharpening. The design of the end part 8 in the form of a cone with blades contributes to the displacement of the milling cutter in the annular space during the passage of the "dead point". The used bursploy, the configuration of the blades, as well as the presence of the cutting inserts 6 lead to the appearance of large chips when milling 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.

Thus, an increase in the milling speed due to better removal of sludge and the passage of the "zero point" is ensured.

Claims (1)

A milling cutter with the possibility of fixing on a wedge-deflector, comprising a hollow body with a flushing channel along the axis of the cutter, through flushing holes in the cutting part of the body made at an angle to the axis of the cutter, the upper part of the body being cylindrical in shape and the side part of a variable cross-section in the form of a polyhedron on which the cutting elements are fixed, while the lower end surface of the housing is made with cutting elements, and the cutting-abrasive surfaces of the side and end parts of the housing are reinforced with cutting elements, fixed in the longitudinal grooves made in the steps of the cutting edges, the cutting elements are in the form of a flat irregular trapezoid, characterized in that the casing is connected by an integral connection to the sub, through flushing holes for supplying flushing fluid are made on the side and end parts of the cutter equipped with blades having rectangular section and coated with a cutting coating of drill alloy, which is a composite bar made of chipped tungsten-cobalt hard alloy Which is filled with brazing material on a nickel basis, wherein the end portion of the housing is formed as a cone with blades converging in the center of the end part of the cutter, which are reinforced carbide cutting inserts mounted and sealed in the grooves.

Images