CN102704881A - Reverse forging milling cutter - Google Patents

Abstract

A reverse forging milling cutter. The upper joint is in threaded connection with the core pipe, the outer wall of the core pipe is sleeved with a central pipe, the upper joint is connected with the piston cylinders, pistons are arranged in the piston cylinders, the pistons are fixed on the central pipe, the central pipe and the inner cavities of the piston cylinders, the piston cylinders are connected through joints, a piston is arranged in each piston cylinder, the piston cylinder I is connected with the outer cylinder through a joint, the lower end of the outer cylinder is connected with a plug, the plug is connected with a pull rod, the pull rod is connected with the central pipe through a back cap, the outer wall of the lower end of the pull rod is connected with the body through a reducing body, the lower end of the body is connected with a cutter holder, the cutter holder is connected with a cutter body, a cutter body piston. The reverse forging milling cutter can forge and mill the sleeve of the upper fracture deformation part, so that the channel space is enlarged, and the next construction is facilitated.

Description

reverse forging milling cutter

technical field

The invention belongs to a tool used in major workover operations in oil fields, in particular to a reverse forging and milling cutter.

Background technique

At present, with the further development of the oilfield, the casing damage of wells is becoming more and more complicated, especially in many faulted wells, the upper and lower fractures have a large range of lateral displacement after faulting, and the detection tools such as lead molds cannot detect the lower fractures at all. , the existing channel drilling tools cannot perform channel drilling operations, resulting in an extremely low recovery rate for such faulted wells.

Contents of the invention

In order to solve the problems existing in the background technology, the present invention provides a reverse forging and milling cutter, which can forge and mill the casing of the deformed part of the upper fracture, increase the space for finding channels, and facilitate the next step of construction.

The technical solution of the present invention is: the reverse forging and milling cutter includes an upper joint, the inner thread of the upper joint is connected to the core pipe, the outer wall of the core pipe is covered with a central pipe, the outer thread of the upper joint is connected to the piston cylinder, and the piston cylinder is provided with a piston , the piston is stuck on the outer wall of the central tube, the inner cavity of the piston communicates with the inner cavity of the core tube, the lower end of the piston cylinder is connected to the joint, the lower end of the joint is connected to the piston cylinder I, the piston cylinder I is equipped with a piston I, the piston I is stuck on the outer wall of the central tube, and the inner piston I The cavity communicates with the inner cavity of the core tube. The piston cylinder I is connected to the outer cylinder through a joint, and the lower end of the outer cylinder is connected to a spline shaft plug, and the spline shaft plug is connected to the spline shaft drawing tube. The lower end is connected by the back cap, the outer wall of the lower end of the spline shaft drawing tube is connected with the reducer body, the lower end of the reducer body is connected with the body, the lower end of the body is connected with the knife seat through the bolt, the knife seat is connected with the knife body through the pin shaft, and the body is equipped with a knife body piston, a spring is provided in the cavity between the body and the cutter body piston, the piston cavity in the body communicates with the inner cavity of the core tube, and a nozzle is fixed in the end of the core tube.

A stopper is fixed in the outer wall groove of the body corresponding to the lower end of the above-mentioned cutter body through a limit bolt, and a surfacing layer is fixed on the bottom surface of the body.

A V-shaped ring is installed between the contact surfaces of the above-mentioned body and the cutter body piston.

The present invention has the following beneficial effects: since the space between the upper and lower fractures is small, and the lower fracture is often far away from the center line of the casing, it is difficult to insert the tool for finding a channel into the lower fracture. The casing is forged and milled to increase the space for finding passages and facilitate the next step of construction.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present invention.

In the figure 1-upper joint; 2-apron; 3-apron; 4-piston; 5-piston cylinder; 6-apron; 7-apron; 8-joint; 9-center tube; 10-piston cylinder I ;11-piston Ⅰ;12-apron; 13-core tube; 14-outer cylinder; 15-spline shaft pull tube; 16-spline shaft plug; V-shaped ring; 20-nozzle; 21-spring; 22-body; 23-cutter body piston; 24-bolt; layer; 30-stop bolt.

Detailed ways:

The present invention will be further described below in conjunction with accompanying drawing:

As shown in Figure 1, the reverse forging milling cutter includes an upper joint 1, the upper joint 1 is internally threaded to connect a core tube 13, a sealing ring 2 is provided between the contact surface of the upper joint 1 and the core tube 13, and the core tube 13 The outer wall is covered with a central tube 9, a sealing ring 3 is provided between the upper end of the central tube 9 and the contact surface of the core tube 13, the upper joint 1 is externally threaded to connect the piston cylinder 5, and the piston cylinder 5 is provided with a piston 4, which is stuck in the center The outer wall of the tube 9 and the inner cavity of the piston 4 communicate with the inner cavity of the core tube 13. The outer wall of the core tube 13 is provided with a groove and the groove communicates with the inner cavity of the piston 4. Under the action of hydraulic pressure, the piston 4 drives the central tube 9 along the core tube. 13 moves upward, the lower end of the piston cylinder 5 is connected to the joint 8, a sealing ring 7 is provided between the contact surface of the piston cylinder 5 and the joint 8, a sealing ring 6 is provided between the central tube 9 and the contact surface of the joint 8, and the lower end of the joint 8 is connected to the piston cylinder I10, the piston cylinder I10 is equipped with a piston I11, and the piston I11 is stuck on the outer wall of the central tube 9. Under the action of hydraulic pressure, the piston I11 drives the central tube 9 to move upward along the core tube 13, between the contact surface of the piston cylinder I10 and the piston I11 and A sealing ring 12 is provided between the contact surface of the piston I 11 and the central tube 9, the inner cavity of the piston I 11 communicates with the inner cavity of the core tube 13, the outer wall of the core tube 13 is provided with a groove and the groove communicates with the inner cavity of the piston I 11, the piston Cylinder Ⅰ 10 is connected with an outer cylinder 14 through a joint, and the lower end of the outer cylinder 14 is connected with a spline shaft plug 16, and the spline shaft plug 16 is connected with a spline shaft drawing tube 15, and the inner wall of the lower end of the spline shaft drawing tube 15 is connected with the central tube 9 The lower end is connected by the back cap 18, and the outer wall of the lower end of the spline shaft drawing tube 15 is connected with a reducing body 17, and the lower end of the reducing body 17 is connected with a body 22, and the lower end of the body 22 is connected with a knife seat 25 through a bolt 24, and the knife seat 25 is passed through a pin shaft 26 Connected with a cutter body 27, the body 22 is provided with a cutter body piston 23, the inner wall of the cutter body piston 23 is provided with a groove, the upper end of the cutter body 27 is stuck in this groove, and the inner wall of the lower end surface of the cutter body piston 23 is a slope surface. The slope surface coincides with the cutter body 27, and the piston 23 pushes the cutter body 27 downward under the action of hydraulic pressure, so that the cutter body 27 expands, and a spring 21 is arranged in the cavity between the body 22 and the cutter body piston 23. Under the action of 21, the piston 23 returns to its original position, the piston cavity in the body 22 communicates with the inner cavity of the core tube 13, and the nozzle 20 is fixed in the end of the core tube 13, and when the liquid in the core tube 13 reaches the nozzle 20, the flow The area becomes smaller, and a part of liquid enters the piston chamber of the cutter body piston 23 to generate downward pressure on the cutter body piston 23 .

The body 22 outer wall groove corresponding to the lower end of the cutter body 27 is fixed with a stopper 28 by a stop bolt 30, the bottom surface of the body 22 is fixed with a surfacing layer 29, and the stopper 28 is matched with the boss at the lower end of the cutter body 27. Has a limiting effect.

A V-shaped ring 19 is installed between the contact surface of the body 22 and the cutter body piston 23, and the V-shaped ring 19 forms a seal between the piston and the body.

During use, under the action of the hydraulic pressure in the core tube 13, the cutter body piston 23 moves down to push the cutter body 27 to expand. At this time, the spring 21 is compressed, and the stop block 28 makes the cutter body 27 open to a certain degree and no longer continues to open. At the same time, under the action of hydraulic pressure, the piston 4 and the piston I11 move up to drive the center tube 9 to move up. After the center tube 9 moves up, it drives all the tools at the bottom of the center tube 9 to move up, so that the cutter body 27 moves up while milling the damaged sleeve. Pipe, increase the space for finding passages, and facilitate the next step of construction. After the forging and milling is finished, the pressure disappears, and the cutter body 27 is retracted into the main body under the action of the spring 21 .

Claims (3)

1. A reverse forging and milling cutter, comprising an upper joint (1), characterized in that: the inner thread of the upper joint (1) is connected to a core pipe (13), and the outer wall of the core pipe (13) is covered with a central pipe (9 ), the upper joint (1) is externally threaded to connect the piston cylinder (5), the piston cylinder (5) is provided with a piston (4), the piston (4) is fixed on the outer wall of the central tube (9), the inner cavity of the piston (4) and the core The inner cavities of the pipes (13) are connected, the lower end of the piston cylinder (5) is connected to the joint (8), the lower end of the joint (8) is connected to the piston cylinder I (10), and the piston cylinder I (10) is provided with a piston I (11), a piston I (11) is stuck on the outer wall of the central tube (9), the inner cavity of the piston I (11) communicates with the inner cavity of the core tube (13), and the piston cylinder I (10) is connected with the outer cylinder (14) through the joint, and the outer cylinder (14) The lower end is connected with a spline shaft plug (16), and the spline shaft plug (16) is connected to the spline shaft drawing tube (15), and the inner wall of the lower end of the spline shaft drawing tube (15) and the lower end of the central tube (9) pass through the back cap (18) connection, spline shaft draw tube (15) lower end outer wall is connected with reducing body (17), and reducing body (17) lower end is connected with body (22), and the lower end of body (22) is connected knife by bolt (24) Seat (25), knife seat (25) is connected with cutter body (27) by bearing pin (26), is provided with cutter body piston (23) in the body (22), between body (22) and cutter body piston (23) Spring (21) is arranged in the cavity between, and the piston cavity in the body (22) communicates with the inner chamber of the core tube (13), and the nozzle (20) is fixed in the end of the core tube (13). 2. The reverse forging and milling cutter according to claim 1, characterized in that: the outer wall groove of the body (22) corresponding to the lower end of the cutter body (27) is fixed with a stopper (28) by a limit bolt (30), and the body The bottom surface of (22) is fixed with overlay welding layer (29). 3. The reverse forging milling cutter according to claim 1, characterized in that: a V-shaped ring (19) is installed between the contact surface of the body (22) and the cutter body piston (23).

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