Disposable well casing milling head
By using high-strength alloy steel and a spirally arranged cutting assembly and a straightening wing design, the problems of rapid wear and low cutting efficiency of the milling head have been solved, resulting in improved wear resistance and cutting efficiency, reduced operating costs, and protection of the casing and wellbore integrity.
Patent Information
- Application Number
- CN202520547174.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Existing milling heads wear out quickly and have low cutting efficiency when facing complex downhole environments, which can easily damage the casing, leading to increased operating costs, extended project time, and even affecting the integrity of the wellbore.
The cutting head and carbide cutting teeth are made of high-strength alloy steel, combined with spirally arranged cutting components and elastic stabilizers. They are quickly connected through a connector to ensure that the cutting head operates in the center of the wellbore and removes debris in a timely manner through the drilling fluid flow channel.
It improves the wear resistance of the cutting head, extends its service life, reduces operating costs, increases cutting efficiency, protects the casing, ensures the integrity of the wellbore, and shortens the operation time.
Smart Images
Figure CN223689659U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of petroleum engineering, more particularly to a kind of abandoned well casing mill head. BACKGROUND
[0002] In the process of oil exploitation, the disposal of abandoned well is an important link. Various obstacles exist in the abandoned well, such as residual pipe column, cement block, sandstone, etc., which need to be cleaned and broken by casing mill head for subsequent well sealing and other operations. However, the existing casing mill head has the problems of fast wear, low cutting efficiency and easy damage to casing when facing complex downhole environment, resulting in increased operation cost, prolonged construction period and even possible impact on the integrity of wellbore.
[0003] Therefore, there is a need for an abandoned well casing mill head to solve the problems of fast wear, low cutting efficiency and easy damage to casing in the prior art, which leads to increased operation cost, prolonged construction period and even possible impact on the integrity of wellbore. SUMMARY
[0004] The utility model aims to provide an abandoned well casing mill head to solve the problems raised in the background.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a casing mill head body is provided, a cutting assembly and a centralizer wing are arranged on the casing mill head body, the cutting assembly is arranged in a spiral, the centralizer wing is arranged on the outer side wall of the casing mill head body and made of elastic material, and a connecting joint is arranged at the lower end of the casing mill head body.
[0006] It should be noted that the casing mill head body includes a cutting head and a drilling fluid channel, the drilling fluid channel is arranged on the cutting head, and multiple drilling fluid channels are arranged.
[0007] Further, the cutting assembly includes a mounting portion and a cutting tooth, the cutting tooth is arranged on the mounting portion, multiple mounting portions are arranged, the multiple mounting portions are evenly distributed on the cutting head, and the mounting portions are arranged in a spiral.
[0008] Further, the centralizer wing is multiple, and the multiple centralizer wings are evenly distributed on the outer side wall of the cutting head.
[0009] As a preferred embodiment, the centralizer wing is made of rubber, and the multiple centralizer wings are arranged in a spiral.
[0010] As a preferred embodiment, the connecting joint structure is a threaded connection or a clamp connection.
[0011] As a preferred embodiment, the cutting head is made of high-strength and high-toughness alloy steel material, and the cutting teeth are made of hard alloy.
[0012] Compared with the prior art, the abandoned well casing mill head provided by the utility model has at least the following beneficial effects:
[0013] (1) By adopting the high-strength alloy steel cutting head and the embedded hard alloy cutting teeth, the wear resistance of the cutting head is improved, the service life is prolonged, the operation cost is reduced, the cutting teeth arranged in a spiral manner improve the cutting efficiency and shorten the operation time, and the setting of the centralizing wing effectively protects the casing, reduces the damage of the cutting head to the casing, and ensures the integrity of the wellbore.
[0014] (2) The quick connection structure of the connecting joint facilitates the installation and disassembly of the cutting head, improves the operation efficiency, and the centralizing wing is similar to a spiral line and surrounds the outer side wall of the cutting head, generates a certain spiral propelling force during the casing milling process, helps the cutting head to advance better, and is also beneficial to chip removal, so that the chips are discharged along the spiral direction and the accumulation of the chips around the cutting head is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 It is a front view of the utility model;
[0017] Figure 3 It is a schematic diagram of the local structure of the utility model.
[0018] In the drawing:
[0019] 100, casing mill head body; 101, cutting head; 102, drilling fluid flow channel;
[0020] 200, cutting assembly; 201, mounting portion; 202, cutting tooth;
[0021] 300, connecting joint;
[0022] 400, centralizing wing. DETAILED DESCRIPTION
[0023] Please refer to Figures 1-3 The utility model provides casing mill head body 100, casing mill head body 100 is provided with cutting assembly 200, centralizing wing 400, cutting assembly 200 is spirally arranged, centralizing wing 400 is arranged on the outer side wall of casing mill head body 100, is made of elastic material, and the lower end of casing mill head body 100 is provided with connecting joint 300 for being connected with casing mill pipe column.
[0024] The scheme has the following working process: firstly, one end of the sleeve milling head body 100 is connected with the sleeve milling pipe column through the connecting joint 300; then, the sleeve milling head body 100 is lowered into the disposal well, and the sleeve milling pipe column is driven to rotate by the ground equipment, so as to drive the sleeve milling head body 100 to rotate; in the sleeve milling process, the cutting assembly 200 cuts and crushes the downhole obstacles, the spiral arrangement makes the cutting force more uniform, and at the same time pushes the cuttings to the direction of the chip discharge port; at the same time, the centralizer wing 400 contacts with the sleeve pipe wall during the rotation of the sleeve milling head body 100, plays a centralizing role, and ensures that the sleeve milling head body 100 operates at the center position of the wellbore; when the cutting assembly 200 is worn to a certain extent, it is detached from the sleeve milling pipe column through the connecting joint 300, a new sleeve milling head body 100 is replaced, and the sleeve milling operation is continued.
[0025] According to the above working process, the cutting assembly 200 in the spiral arrangement mode improves the cutting efficiency, shortens the operation time, and effectively protects the sleeve pipe through the setting of the centralizer wing 400, reduces the damage of the sleeve milling head body 100 to the sleeve pipe, and ensures the integrity of the wellbore
[0026] Further as shown in Figure 2 , the sleeve milling head body 100 includes a cutting head 101 and a drilling fluid flow passage 102, the drilling fluid flow passage 102 is arranged on the cutting head 101, and the drilling fluid flow passage 102 is provided with multiple drilling fluid flow passages 102. High-pressure flushing fluid is injected into the drilling fluid flow passage 102, so that the cuttings cut down are washed away in time, and the cutting assembly 200 is kept clean and sharp.
[0027] Further as shown in Figure 2 and Figure 3 , the cutting assembly 200 includes a mounting portion 201 and a cutting tooth 202, the cutting tooth 202 is arranged on the mounting portion 201, the mounting portion 201 is provided with multiple mounting portions 201, the multiple mounting portions 201 are uniformly distributed on the cutting head 101, the mounting portion 201 is spirally distributed, and the mounting portion 201 and the cutting tooth 202 in the spiral arrangement make the cutting force more uniform, and at the same time push the cuttings to the direction of the chip discharge port, so as to increase the cutting force and the chip removal capacity, and improve the cutting efficiency.
[0028] Further as shown in Figure 1 and Figure 2 , the number of the centralizer wings 400 is multiple, the multiple centralizer wings 400 are uniformly distributed on the outer side wall of the cutting head 101, can play a centralizing role in the sleeve milling process, make the cutting head 101 remain at the center position of the wellbore, reduce the contact and friction with the sleeve pipe wall, and reduce the damage risk to the sleeve pipe.
[0029] Further as shown in Figure 1 and Figure 2As shown, the righting wing 400 is made of rubber, and multiple righting wings 400 are arranged in a spiral shape. This shape can generate a certain spiral propulsion force during the reaming process, helping the reaming head 101 to advance better, and is also conducive to chip removal, allowing the chips to be discharged along the spiral direction and reducing the accumulation of chips around the reaming head 101.
[0030] Further as shown in Figure 1 The connecting joint 300 is in the form of a threaded connection or a clamp connection, facilitating the installation and removal of the cutting head 101.
[0031] Further as shown in Figure 1 and Figure 2 The cutting head 101 is made of high-strength and high-toughness alloy steel, which can withstand high pressure and impact in the well. The cutting teeth 202 are made of hard alloy, which has high hardness and good wear resistance, and can effectively break down obstacles in the well.
[0032] In summary, first, one end of the reaming head body 100 is connected to the reaming pipe string through the connecting joint 300; then, the reaming head body 100 is lowered into the disposal well, and the reaming pipe string is driven to rotate by the surface equipment, driving the reaming head body 100 to rotate; during the reaming process, the cutting assembly 200 cuts and breaks down the obstacles in the well, and the spiral arrangement makes the cutting force more uniform, while pushing the chips towards the chip discharge port; at the same time, the righting wing 400 contacts the casing wall during the rotation of the reaming head body 100, playing a righting role and ensuring that the reaming head body 100 operates at the center of the wellbore; when the cutting assembly 200 is worn to a certain extent, it is detached from the reaming pipe string through the connecting joint 300, and a new reaming head body 100 is replaced to continue the reaming operation.
[0033] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A discarded well casing milling head, comprising a milling head body (100), characterized in that, The milling head body (100) is provided with a cutting component (200) and a straightening wing (400). The cutting component (200) is spirally arranged. The straightening wing (400) is arranged on the outer side wall of the milling head body (100) and is made of elastic material. The lower end of the milling head body (100) is provided with a connecting joint (300).
2. A discarded well casing milling head according to claim 1, characterized in that: The milling head body (100) includes a cutting head (101) and a drilling fluid channel (102). The drilling fluid channel (102) is disposed on the cutting head (101), and there are multiple drilling fluid channels (102).
3. A discarded well casing milling head according to claim 2, characterized in that: The cutting assembly (200) includes a mounting part (201) and cutting teeth (202). The cutting teeth (202) are disposed on the mounting part (201). There are multiple mounting parts (201), which are evenly distributed on the cutting head (101) and are spirally distributed.
4. A discarded well casing milling head according to claim 2, characterized in that: The number of the straightening wings (400) is multiple, and the multiple straightening wings (400) are evenly distributed on the outer side wall of the cutting head (101).
5. A discarded well casing milling head according to claim 4, characterized in that: The straightening wing (400) is made of rubber, and the plurality of the straightening wings (400) are arranged in a spiral.
6. A discarded well casing milling head according to claim 1, characterized in that: The connecting joint (300) has a threaded connection or a clamp connection.
7. A discarded well casing milling head according to claim 3, characterized in that: The cutting head (101) is made of high-strength, high-toughness alloy steel, and the cutting teeth (202) are made of cemented carbide.