A double-layer sleeve pipe swaging and milling device

Abstract

The application discloses a cutter type double-layer casing forging and milling device, which comprises an upper joint, the lower end of the upper joint is connected with a main body through a drill rod buckle, the inner wall of the main body is provided with a flow distribution disc, the middle part of the flow distribution disc is penetrated by a flow limiting rod, the outer wall of the upper end of the flow limiting rod is provided with a flow guide head, the inside of the main body below the flow distribution disc is provided with a piston, the outer wall of the upper end of the piston is fixed with a sealing element, the outer wall of the sealing element is in abutment with the inner wall of the main body, the middle part of the piston is provided with a through hole, the top of the through hole is provided with a flow limiting sleeve, and the top of the through hole above the flow limiting sleeve is provided with a clamping spring. The cutter type double-layer casing forging and milling device can simultaneously perform windowing operation on two layers of casings at one time, improves the workover quality, increases the workover efficiency and generates certain economic benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of forging miller, in particular to a cutter type double casing forging miller. BACKGROUND

[0002] In the process of oil drilling, casing windowing is a common way of oil field exploitation. When the cementing quality of both production casing and technical casing is poor or corroded in workover operation, it is necessary to simultaneously perform forging milling operation on the two layers of casing. At present, there is no such tool in China, and only single-layer casing can be forged and milled, and the external technical casing is filled with cement, which cannot be completely transformed.

[0003] In view of the above problems, it is urgent to make innovative design on the basis of the original forging miller. SUMMARY

[0004] The present application relates to the technical field of forging miller, in particular to a cutter type double casing forging miller.

[0005] To achieve the above object, the present application provides the following technical scheme: a cutter type double casing forging miller, comprising an upper joint, the lower end of the upper joint is connected with the main body through a drill rod buckle, the inner wall of the main body is provided with a flow divider, the middle part of the flow divider penetrates a flow limiting rod, the outer wall of the upper end of the flow limiting rod is provided with a flow guide head, the inside of the main body below the flow divider is provided with a piston, the outer wall of the upper end of the piston is fixed with a sealing element, the outer wall of the sealing element is in contact with the inner wall of the main body, the middle part of the piston is provided with a through hole, the top of the through hole is provided with a flow limiting sleeve, the top of the through hole above the flow limiting sleeve is provided with a snap spring, the outer wall of the piston is nested with a spring, the top of the spring is connected with the lower surface of the maximum diameter of the top of the piston, and the bottom of the spring is connected with the step in the main body, the middle part of the main body is fixedly provided with a limiting block through a first mounting screw, the inside of the main body below the limiting block is rotatably provided with a windowing blade through a first blade shaft, the lower end of the windowing blade is rotatably provided with a forging milling blade through a second blade shaft, the outer wall of the windowing blade and the outer wall of the forging milling blade are fixedly provided with a hard alloy, and the lower end of the forging milling blade is connected with the slide on the main body through a third blade shaft.

[0006] Preferably, the lower part of the main body is provided with a forging milling positioning block, and the forging milling positioning block is mounted on the main body through a second mounting screw.

[0007] Preferably, the lower part of the main body is provided with a water eye, and the water eye is fixed on the main body through another snap spring.

[0008] Preferably, the flow guide head and the flow limiting rod are threadedly connected, and the flow limiting rod and the flow divider are threadedly connected.

[0009] Preferably, the flow limiting rod, the snap spring and the flow limiting sleeve constitute a shunt pressure drop display mechanism.

[0010] Preferably, the sealing member is provided with three.

[0011] Preferably, the windowing blade and the forging milling blade are equiangularly distributed about the central axis of the main body.

[0012] Preferably, the outer wall of the windowing blade and the forging milling blade is welded with two rows of hard alloys.

[0013] Compared with the prior art, the beneficial effects of the present application are that the cutter type double-layer casing forging miller simultaneously performs windowing operation on two layers of casings at one time, thereby improving the workover quality and increasing the workover efficiency and generating certain economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a main view structural schematic diagram of the present application when entering a well;

[0015] Figure 2 is a main view structural schematic diagram of the present application when working;

[0016] Figure 3 is a third blade shaft side view installation structural schematic diagram of the present application;

[0017] Figure 4 is a windowing blade side view structural schematic diagram of the present application when working.

[0018] In the figure: 1, upper joint; 2, main body; 3, flow guide head; 4, shunt disc; 5, flow limiting rod; 6, snap spring; 7, sealing member; 8, flow limiting sleeve; 9, piston; 10, spring; 11, first mounting screw; 12, limiting block; 13, first blade shaft; 14, windowing blade; 15, second blade shaft; 16, hard alloy; 17, forging milling blade; 18, forging milling positioning block; 19, second mounting screw; 20, third blade shaft; 21, water eye. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] Please refer to Figures 1-4The application provides a technical scheme: a cutting knife type double-layer sleeve forging and milling device, which comprises an upper joint 1, the lower end of the upper joint 1 is connected with a main body 2 through a drill rod buckle, a flow distribution disc 4 is installed on the inner wall of the main body 2, a flow limiting rod 5 penetrates the middle part of the flow distribution disc 4, a flow guide head 3 is arranged on the outer wall of the upper end of the flow limiting rod 5, a piston 9 is installed below the flow distribution disc 4 in the main body 2, a sealing element 7 is fixed to the outer wall of the upper end of the piston 9, the outer wall of the sealing element 7 is in abutment with the inner wall of the main body 2, a through hole is formed in the middle part of the piston 9, a flow limiting sleeve 8 is installed on the top of the through hole, a snap spring 6 is installed above the flow limiting sleeve 8 on the top of the through hole, a spring 10 is nested on the outer wall of the piston 9, the top of the spring 10 is connected with the lower surface of the maximum diameter of the top of the piston 9, and the bottom of the spring 10 is connected with a step in the main body 2, and the spring 10 is used for resetting the piston 9 in the later period.

[0021] A limiting block 12 is fixedly installed on the middle part of the main body 2 through a first mounting screw 11, a windowing blade 14 is rotatably installed on the inner part of the main body 2 below the limiting block 12 through a first cutter shaft 13, a forging and milling blade 17 is rotatably installed on the lower end of the windowing blade 14 through a second cutter shaft 15, the outer walls of the windowing blade 14 and the forging and milling blade 17 are both fixedly provided with hard alloys 16, the lower end of the forging and milling blade 17 is connected with a slide on the main body 2 through a third cutter shaft 20, a forging and milling positioning block 18 is installed on the lower part of the main body 2, the forging and milling positioning block 18 is fixed on the main body 2 through a second mounting screw 19, and the windowing blade 14 and the forging and milling blade 17 are both distributed with three equal angles about the central axis of the main body 2.

[0022] A water eye 21 is installed on the lower part of the main body 2, and the water eye 21 is installed on the main body 2 through another snap spring 6, the water eye 21 with a proper inner diameter is selected according to the different displacement of a mud pump to control the pressure difference between the inside and outside of the tool to drive the piston 9.

[0023] The flow guide head 3 and the flow limiting rod 5 are in threaded connection, and the flow limiting rod 5 and the flow distribution disc 4 are in threaded connection, so that the flow guide head 3, the flow distribution disc 4 and the flow limiting rod 5 are assembled together.

[0024] The flow limiting rod 5, the snap spring 6 and the flow limiting sleeve 8 form a flow distribution pressure drop display mechanism, and whether forging and milling is performed after cutting off the sleeve is determined according to the wellhead pressure.

[0025] The three sealing elements 7 increase the sealing performance of the connection between the piston 9 and the main body 2.

[0026] Two rows of hard alloys 16 are welded on the outer walls of the windowing blade 14 and the forging and milling blade 17, and are used for cutting the sleeve.

[0027] Working principle: In construction, the upper joint 1 at the top of the forging mill is fixedly connected with the drill pipe, after being lowered to the designated position, the pipe string is rotated, the pump is started to pump in the mud, after the mud enters the inside of the upper joint 1, it flows into the main body 2, under the action of the flow guide head 3, it enters the top of the piston 9 along the holes on the flow divider 4, because the lower end of the flow limiting rod 5 is inserted into the flow limiting sleeve 8, and the gap between them is small, a throttling pressure difference is generated, so that the piston 9 moves downward, at the same time, the lower end of the piston 9 presses the windowing blade 14 downward, so that the windowing blade 14 rotates with the first blade shaft 13 and opens outward from the casing, at the same time, the pipe string is rotated, the hard alloy 16 on the windowing blade 14 cuts the casing, as the piston 9 continues to move downward, the opening angle of the windowing blade 14 increases, the cutting of the two layers of casing is completed, as the windowing blade 14 opens, the forging milling blade 17 is also pulled out from the main body 2, forming a cutting triangle, after cutting the two layers of casing, the flow limiting sleeve 8 in the piston 9 and the flow limiting rod 5 on the main body 2 are dislocated, causing the throttling area to increase, under the condition of the same displacement, a pressure drop is generated, after the pressure drop is displayed, the pipe string is pressed downward, the forging milling blade 17 contacts the lower casing, the pipe string is rotated, the three sets of hard alloy 16 on the forging milling blade 17 simultaneously mills the lower two layers of casing, after the forging milling operation is completed, the large displacement is cleaned, the iron filings are removed, after the pump is stopped, the pressure difference between the inside and outside of the tool is zero, the pipe string is pulled up, the windowing blade 14 contacts the upper casing and is squeezed back into the main body 2, at the same time, the forging milling blade 17 is also retracted into the main body 2, the forging milling operation is completed.

[0028] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions described in the foregoing embodiments, or make equivalent replacements to part of the technical features, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A double cannula swage cutter with a cutting knife, comprising an upper joint (1), characterized in that: The lower end of the upper joint (1) is connected with the main body (2) through a drill rod buckle, the inner wall of the main body (2) is provided with a flow distribution disc (4), the middle part of the flow distribution disc (4) penetrates a flow limiting rod (5), the outer wall of the upper end of the flow limiting rod (5) is provided with a flow guide head (3), the inside of the main body (2) below the flow distribution disc (4) is provided with a piston (9), the outer wall of the upper end of the piston (9) is fixedly provided with a sealing element (7), the outer wall of the sealing element (7) is in abutment with the inner wall of the main body (2), the middle part of the piston (9) is provided with a through hole, the top of the through hole is provided with a flow limiting sleeve (8), and the top of the through hole above the flow limiting sleeve (8) is provided with a clamping spring (6), the outer wall of the piston (9) is nested with a spring (10), the top of the spring (10) is connected with the lower surface of the maximum diameter of the top of the piston (9), and the bottom of the spring (10) is connected with a step in the main body (2), the middle part of the main body (2) is fixedly provided with a limiting block (12) through a first mounting screw (11), the inside of the main body (2) below the limiting block (12) is rotatably provided with a windowing blade (14) through a first cutter shaft (13), the lower end of the windowing blade (14) is rotatably provided with a forging milling blade (17) through a second cutter shaft (15), the outer wall of the windowing blade (14) and the outer wall of the forging milling blade (17) are fixedly provided with a hard alloy (16), and the lower end of the forging milling blade (17) is connected with a slide on the main body (2) through a third cutter shaft (20).

2. The double cannula swager and miller of claim 1 wherein: The lower part of the main body (2) is provided with a forging milling positioning block (18), and the forging milling positioning block (18) is fixed on the main body (2) through a second mounting screw (19).

3. The double cannula swager and miller of claim 1 wherein: The lower part of the main body (2) is provided with a water eye (21), and the water eye (21) is mounted on the main body (2) through another clamping spring (6).

4. The double cannula swage and miller of claim 1 wherein: The flow guide head (3) and the flow limiting rod (5) are in threaded connection, and the flow limiting rod (5) and the flow distribution disc (4) are in threaded connection.

5. The double cannula swage and reamer of claim 1 wherein: The flow limiting rod (5), the clamping spring (6) and the flow limiting sleeve (8) form a flow distribution pressure drop display mechanism.

6. The double cannula swage and reamer of claim 1 wherein: The sealing element (7) is provided with three.

7. The double cannula swage and reamer of claim 1 wherein: The windowing blade (14) and the forging milling blade (17) are equally angularly distributed about the central axis of the main body (2).

8. The double cannula swage and reamer of claim 1 wherein: The outer walls of the windowing blade (14) and the forging milling blade (17) are welded with two rows of hard alloys (16).

Images