CN215927314U

CN215927314U - Arc cutting device for operation machine with pressure

Info

Publication number: CN215927314U
Application number: CN202121675220.6U
Authority: CN
Inventors: 罗伟; 贾帅; 孙阚
Original assignee: Sichuan Shengnuo Oil And Gas Engineering Technology Service Co ltd; Sichuan Aiwen Sichuang Energy Technology Co ltd
Current assignee: Sichuan Shengnuo Oil And Gas Engineering Technology Service Co ltd; Sichuan Aiwen Sichuang Energy Technology Co ltd
Priority date: 2021-04-08
Filing date: 2021-07-22
Publication date: 2022-03-01
Anticipated expiration: 2031-07-22

Abstract

The utility model discloses an arc-shaped cutting device for a belt press, relates to the field of drilling equipment, and provides the arc-shaped cutting device for the belt press, which can enable a drill rod to basically keep a circular shape after being cut off. The cutting device comprises two cutting knives with cutting edges, the shape of the cutting edges is semicircular. Preferably, the cross section of the cutting edge is in an isosceles triangle shape, the included angle between the two surfaces of the cutting edge is a, and a is more than or equal to 25 degrees and less than or equal to 40 degrees; two cutting knives are just opposite to each other. The further preferred cutting knife includes cutter body and blade, and the cutting edge sets up on the blade, and the blade can be dismantled with the cutter body and be connected. The cutting edge is semicircular, so that the end part of the broken drill rod is basically circular, is matched with a fishing tool and is convenient for subsequent fishing operation. Two cutting knives are just opposite to each other, so that the length of the ram blowout preventer can be reduced, the reduction of the size of the ram blowout preventer is facilitated, and the cost is saved.

Description

Arc cutting device for operation machine with pressure

Technical Field

The utility model relates to the field of drilling equipment, in particular to an arc-shaped cutting device for a belt press working machine.

Background

The under-pressure operation machine is a device which can effectively implement drilling and workover operations under the condition of no need of killing well or open flow operation. The ram blowout preventer is an important part of a pressurized operation machine, is arranged at an oil gas wellhead, and can close the wellhead to control blowout when the pressure of oil gas in a well is very high; the ram blowout preventer has a drill pipe passing bore through it through which the drill pipe passes in use. Ram preventers have a full seal function, i.e., in special cases, the cutting structure can shear the drill pipe, and then the ram moves to completely close the drill pipe through hole, thereby achieving full seal.

The cutting structure of the existing ram blowout preventer with the pressure comprises two cutting knives, the cutting edges of the cutting knives are generally in a straight line shape and are arranged like common scissors in a staggered manner, and the cutting driving mechanism of the ram blowout preventer drives the two cutting knives to move in opposite directions so as to cut off a drill rod positioned between the two cutting knives. The disadvantages of such cutting knives are: when cutting, the drill rod is extruded to be flattened and then cut off, and the end part of the cut drill rod is flat; and the drill rod in the well needs to be salvaged subsequently after being cut off, and the fishing tools are designed according to the circular drill rod, so that the fishing operation of the squeezed drill rod is difficult. In addition, the dislocation arrangement of two cutting knives of the cutting structure of the existing under-pressure operation machine can increase the length of the ram blowout preventer, thus being not beneficial to reducing the volume and saving the cost.

ZL201921076548.9 discloses a ram preventer cutting structure, and the cutting edge shape of its cutting knife is the great V-arrangement of contained angle, and two cutting knives dislocation set have above-mentioned shortcoming equally.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: provided is an arc cutting device for a belt press machine, which can maintain a substantially circular shape after a drill rod is sheared.

The technical scheme adopted for solving the problems is as follows: the arc cutting device for the belt press comprises two cutting knives with cutting edges, and the cutting edges are semicircular.

Further, the method comprises the following steps: the cross section of the cutting edge is in an isosceles triangle shape, the included angle between the two surfaces of the cutting edge is a, and a is more than or equal to 25 degrees and less than or equal to 40 degrees; two cutting knives are just opposite to each other.

Further, the method comprises the following steps: the cutting knife comprises a knife body and a blade, the cutting edge is arranged on the blade, and the blade is detachably connected with the knife body.

Further, the method comprises the following steps: the arc-shaped cutting device for the belt press comprises a fastener, a blade is in a semicircular ring shape, a blade groove matched with the blade is formed in a cutter body, the back surface of the blade is abutted against the side wall of the blade groove, one surface of the blade is abutted against the bottom surface of the blade groove, the fastener penetrates through the blade and is connected with the cutter body, and the blade is tightly pressed by the fastener.

The utility model has the beneficial effects that: 1. the cutting edge is semicircular, so that the end part of the cut drill rod is basically circular and is matched with a fishing tool, and subsequent fishing operation is facilitated.

2. Further make two cutting knives just to setting up, can make flashboard preventer length reduce, do benefit to and reduce its volume, practice thrift the cost. The cross section of the cutting edge is in the shape of an isosceles triangle, the included angle between the two surfaces of the cutting edge is a, and a is more than or equal to 25 and less than or equal to 40 degrees, so that the drill rod can be cut off even if the cutting knife is arranged right opposite.

Drawings

Fig. 1 is a structural view of a circular arc type cutting device for a first belt press working machine;

FIG. 2 is a side view of a first type of cutting burr;

fig. 3 is a structural view of a circular arc type cutting device for a second belt press working machine;

FIG. 4 is a side view of a second type of cutting burr;

FIG. 5 is a view showing the installation and operation of the arc cutting device for the belt press;

labeled as: the cutting knife 1, the blade 11, the cutting edge 111, the knife body 12, the mounting hole 121, the blade groove 122, the fastener 13, the knife holder 2 and the drill rod 3.

Detailed Description

The utility model is further described with reference to the following figures and detailed description.

As shown in fig. 1, the circular arc type cutting device for the band press comprises two cutting blades 1 having cutting edges 111, and the cutting edges 111 are formed in a semicircular shape.

As shown in figure 5, the cutting knives 1 are installed on the knife seats 2 of the ram blowout preventer for use, the driving mechanism drives the two knife seats 2 to move in opposite directions, and the two cutting knives 1 move in opposite directions to cut off the drill rod 3 positioned between the two cutting knives 1. The cutting edge 111 is semicircular, so that the cutting edge 111 has the effect of preventing and limiting the drill rod 3 from being squeezed flat, the end part of the cut drill rod 3 is basically circular, and the end part is matched with a fishing tool, so that the subsequent fishing operation is convenient to carry out.

The arc-shaped cutting device for the belt press can be arranged in a staggered manner like a pair of scissors, wherein the two cutting knives 1 are arranged one above the other and one below the other, so that effective cutting is guaranteed. In the utility model, as shown in FIG. 2, the cross section of the cutting edge 111 is isosceles triangle, the included angle between two surfaces of the cutting edge 111 is a, and a is more than or equal to 25 degrees and less than or equal to 40 degrees; the two cutting knives 1 are arranged oppositely.

Two cutting knives 1 are just right to setting up, can make flashboard preventer length reduce, do benefit to and reduce its volume, practice thrift the cost. However, the two cutters 1 are arranged oppositely, which easily causes the drill rod 3 not to be cut locally, so that the cross section of the cutting edge 111 is required to be isosceles triangle, the included angle of two surfaces of the cutting edge 111 is a, and a is more than or equal to 25 and less than or equal to 40 degrees. When cutting, the cutting edge 111 cuts into the drill rod 3 and wedges into the drill rod 3 like a wedge, and applies a vertical component force to the drill rod 3, and even if the drill rod 3 is not cut locally, the drill rod 3 is broken by the force, so that the reliability of cutting the drill rod 3 can be ensured.

The cutting edge 111 is subjected to high forces and is easily damaged during operation, and therefore it is obvious that the cutting edge 111 needs to be made of a material with high hardness and strength, such as cemented carbide. If the whole cutting knife 1 is made of the same material as the cutting edge 111, the cost is high; if the damage is to be replaced as a whole, the maintenance cost is further increased. Therefore, as shown in fig. 3 and 4, the cutting knife 1 includes a knife body 12 and a blade 11, the cutting edge 111 is disposed on the blade 11, and the blade 11 is detachably connected to the knife body 12. Thus, only the insert 11 is made of cemented carbide, and the cost of the cutter body 12 is reduced. If the cutting edge 111 is damaged, the blade 11 is replaced, and the maintenance cost is reduced.

The specific manner of detachably connecting the blade 11 and the cutter body 12 is preferably as follows: the arc-shaped cutting device for the belt press comprises a fastening piece 13, wherein the blade 11 is in a semicircular ring shape, the cutter body 12 is provided with a blade groove 122 matched with the blade 11, the back surface of the blade 11 abuts against the side wall of the blade groove 122, one surface of the blade 11 abuts against the bottom surface of the blade groove 122, the fastening piece 13 penetrates through the blade 11 and is connected with the cutter body 12, and the fastening piece 13 presses the blade 11. The back of the blade 11 abuts the side wall of the blade slot 122 to prevent the cutting force from retracting the blade 11.

Some technical parameters of the arc-shaped cutting device for the belt press are preferably as follows: 1. cutting size: 1.9-41/2; 2. the use times are as follows: 200 times; 3. the use temperature is as follows: -30 ℃ to 150 ℃.

Claims

1. Arc type cutting device for pressure operation machine includes two cutting knife (1) that have cutting edge (111), its characterized in that: the shape of cutting edge (111) is semi-circular, and the cross sectional shape of cutting edge (111) is isosceles triangle, and the contained angle on two surfaces of cutting edge (111) is a, and 25 is less than or equal to a and is less than or equal to 40, and two cutting knives (1) are just setting up.

2. The circular arc cutting device for the band pressure working machine according to claim 1, characterized in that: the cutting knife (1) comprises a knife body (12) and a blade (11), the cutting edge (111) is arranged on the blade (11), and the blade (11) is detachably connected with the knife body (12).

3. The circular arc cutting device for the band pressure working machine according to claim 2, characterized in that: the novel cutter comprises a fastening piece (13), wherein the blade (11) is in a semicircular ring shape, a blade groove (122) matched with the blade (11) is formed in the cutter body (12), the back surface of the blade (11) abuts against the side wall of the blade groove (122), one surface of the blade (11) abuts against the bottom surface of the blade groove (122), the fastening piece (13) penetrates through the blade (11) and is connected with the cutter body (12), and the fastening piece (13) compresses the blade (11).