Scraping device in tail end of continuous pipe

Abstract

The utility model provides a scraping device in the tail end of a continuous pipe. The device comprises a fixing unit, a feeding unit, a rotating unit and a tool bit unit. Wherein the fixing unit comprises a coiled tubing centralizing sleeve and a fixing assembly, and the coiled tubing centralizing sleeve can be arranged at the tail end of a coiled tubing in a sleeving mode and is fixed through the fixing assembly; the feeding unit comprises a feeding sleeve and a bearing assembly, the feeding sleeve is in threaded connection with the coiled tubing centralizing sleeve, the bearing assembly is installed in the rear end of the feeding sleeve, and the rear end is the end deviating from the coiled tubing centralizing sleeve; the rotating unit comprises a tool bit connecting rod and a rotating handle, the tool bit connecting rod is installed on the bearing assembly, the rear end of the tool bit connecting rod is located outside the feeding sleeve cavity, and the rotating handle is arranged at the rear end of the tool bit connecting rod; the tool bit unit is installed at the front end of the tool bit connecting rod. The tool is easy to operate, high in practicability, high in efficiency, high in safety, capable of reducing the risk of hurting people due to slipping, long in service life and low in maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction equipment, and more specifically, to a scraping device for the inner end of a continuous pipe. Background Technology

[0002] In oil and gas extraction, coiled tubing is widely used in various processes such as well flushing, drilling and grinding bridge plugs, and sand fracturing. In recent years, coiled tubing tools have gradually shifted from external connections to internal connections. During connection, the welded areas inside the coiled tubing need to be scraped before the tool can be inserted. Due to the weld seams and corrosion formed on the inner wall of the coiled tubing during production, cleaning is necessary to ensure smooth tool insertion and sealing. The internal connection technology for coiled tubing faces three main challenges in application:

[0003] (1) It is difficult to remove the weld seam of the cable continuous pipe.

[0004] Because processes such as well logging and water exploration require continuous conduit for cable laying, the cable is easily damaged during the weld cleaning process, which makes weld removal difficult; in order to ensure that the cable is not damaged, the time required to clean the weld is increased.

[0005] (2) Poor sealing effect, which can easily cause well control accidents.

[0006] Traditional internal reamer cleaning methods cannot effectively remove residual welds, which can easily damage the internal connector sealing ring when it enters the continuous tube, rendering it ineffective. In emergency situations, the double-disc flow valve cannot seal the inner cavity of the continuous tube.

[0007] (3) It is time-consuming and laborious.

[0008] Using traditional internal reamers presents significant challenges for operators and consumes a considerable amount of time and manpower. Utility Model Content

[0009] The purpose of this utility model is to address at least one of the aforementioned shortcomings of the existing technology. For example, one objective of this utility model is to provide an efficient, safe, and economical internal scraping device for the tail end of a continuous tube, which can solve the problems of poor practicality, low efficiency, insufficient operational safety, risk of slippage and injury, short tool life, and high maintenance costs of existing internal scraping tools for the tail end of continuous tubes.

[0010] To achieve the above objectives, this utility model provides a continuous tube end internal scraping device.

[0011] The device may include: a fixing unit, a feeding unit, a rotating unit, and a cutter head unit; wherein, the fixing unit includes a coiled tubing straightener and a fixing assembly, the coiled tubing straightener being able to be fitted onto the tail end of the coiled tubing and fixed by the fixing assembly; the feeding unit includes a feeding sleeve and a bearing assembly, the feeding sleeve being threadedly connected to the coiled tubing straightener, the bearing assembly being installed inside the rear end of the feeding sleeve, the rear end being the end facing away from the coiled tubing straightener; the rotating unit includes a cutter head connecting rod and a rotating handle, wherein the cutter head connecting rod is installed on the bearing assembly and its rear end is located outside the feeding sleeve cavity, the rotating handle being located at the rear end of the cutter head connecting rod; the cutter head unit is installed at the front end of the cutter head connecting rod.

[0012] Furthermore, the fixing component may include a locking clip and a locking clip cap.

[0013] Furthermore, handles can be provided on both the slip cap and the continuous tubing straightening sleeve.

[0014] Furthermore, the bearing assembly may include a deep groove ball bearing, a first thrust ball bearing, a disc spring, a second thrust ball bearing, and a ball bearing cap arranged sequentially from front to back, wherein the direction from front to back is from the front end to the rear end of the feed sleeve.

[0015] Furthermore, the bearing assembly may also include a disc spring cap, which is located at the rear end of the disc spring and outside the second thrust ball bearing and the ball bearing cap.

[0016] Furthermore, the rotating unit may also include a feed centering ring, which is disposed inside the front end of the feed sleeve.

[0017] Furthermore, the rotating unit may also include an elastic mechanism, which is sleeved on the cutter head connecting rod and located between the feed centering ring and the bearing assembly. Even further, the elastic mechanism may include a spring.

[0018] Furthermore, a handle may be provided on the feed sleeve.

[0019] Furthermore, the cutter head unit may include a modular cutter head and a cutter head fixing frame, wherein the cutter head fixing frame is provided with a lower cutter head adjusting sleeve and an upper cutter head adjusting sleeve, and the modular cutter head is located between the lower cutter head adjusting sleeve and the upper cutter head adjusting sleeve.

[0020] Compared with the prior art, the beneficial effects of this utility model include at least one of the following:

[0021] (1) This utility model has a simple structure, low preparation cost, simple operation and easy maintenance.

[0022] (2) This utility model is highly practical and efficient.

[0023] (3) This utility model has high safety and can reduce the risk of slipping and injuring people.

[0024] (4) This utility model tool has a long service life and low maintenance cost. Attached Figure Description

[0025] The above and other objects and / or features of this utility model will become clearer from the following description taken in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 A cross-sectional structural schematic diagram of the continuous tube end internal scraping device of this utility model is shown.

[0027] Explanation of key figure labels:

[0028] 11-Continuous tubing centralizing sleeve, 111-Centralizing sleeve handle, 12-Slip, 13-Slip cap, 131-Slip cap handle;

[0029] 21-Feed sleeve, 211-Rotary feed handle, 22-Deep groove ball bearing, 23-Thrust ball bearing, 24-Disc spring, 25-Disc spring cap, 26-Thrust ball bearing cap;

[0030] 31-Cutter head connecting rod, 32-Infeed straightening ring, 33-Spring, 34-Cutter head rotating handle;

[0031] 41-Module cutter head, 42-Cutter head fixing bracket, 43-Cutter head lower adjustment sleeve, 44-Cutter head upper adjustment sleeve. Detailed Implementation

[0032] The continuous tube end internal scraping device of the present invention will be described in detail below with reference to exemplary embodiments.

[0033] Example 1

[0034] Figure 1 A cross-sectional structural schematic diagram of the scraping device inside the tail end of the continuous tube is shown below, in conjunction with... Figure 1 Let me explain further.

[0035] The continuous tube end scraping device includes a fixing unit, a feeding unit, a rotating unit, and a cutting head unit.

[0036] The fixing unit includes a coiled tubing centralizing sleeve 11 and fixing components. For example... Figure 1 As shown, the coiled tubing centralizer 11 is provided with a centralizer handle 111. The fixing assembly includes slips 12 and slip caps 13, and slip caps 13 are provided with slip cap handles 131.

[0037] The feed unit includes: a feed sleeve 21, a deep groove ball bearing 22, a thrust ball bearing 23, a disc spring 24, a disc spring cap 25, and a thrust ball bearing cap 26. There can be two thrust ball bearings 23, located at opposite ends of the disc spring 24. A rotary feed handle 211 is provided on the feed sleeve 21.

[0038] The rotating unit includes: a cutter head connecting rod 31, a feed centering ring 32, a spring 33, and a cutter head rotating handle 34. The rear section of the cutter head connecting rod 31 is mounted on the aforementioned multiple bearings, and the cutter head rotating handle 34 is located at the rear end of the cutter head connecting rod 31, allowing the cutter head unit to rotate.

[0039] The cutter head unit, also known as an integrated cutter head structure, includes a modular cutter head 41 and a cutter head fixing frame 42. The cutter head fixing frame 42 has a lower cutter head adjusting sleeve 43 and an upper cutter head adjusting sleeve 44. The modular cutter head 41 is mounted on the cutter head fixing frame 42 and located between the lower cutter head adjusting sleeve 43 and the upper cutter head adjusting sleeve 44. The cutter head fixing frame is installed at the front end of the cutter head connecting rod 31.

[0040] To better understand the above embodiments, the installation process of the scraping device inside the tail end of the continuous tube is further described below.

[0041] (1) Install the fixing unit

[0042] Slip cap 13, slip 12 and coiled tubing straightener 11 are sequentially fitted onto the end of the coiled tubing. The slip cap 13 is rotated by the slip cap handle 131 to cause slip 12 to retract and wed into the coiled tubing straightener 11, forming an external fixing device. Slip 12 retracts and grips the outer wall of the coiled tubing, thereby fixing the coiled tubing.

[0043] (2) Install the cutter head unit

[0044] The modular cutter head 41 is installed between the lower cutter head adjusting sleeve 43 and the upper cutter head adjusting sleeve 44 on the cutter head fixing bracket 42 to form an integrated cutter head mechanism.

[0045] (3) Install the feeding device

[0046] The thrust ball bearing cap 26, thrust ball bearing 23, disc spring cap 25, disc spring 24, another thrust ball bearing, and deep groove ball bearing 22 are sequentially installed into the feed sleeve 21 to form a feed device.

[0047] (4) Install the rotating unit and combine it with the cutter head unit.

[0048] Pass the cutter head connecting rod 31 through the inner hole of the feed device, and then put the spring 33 and the feed straightening ring 32 into the cutter head connecting rod 31 in sequence, and connect the cutter head unit to form a rotary scraping mechanism. Install the rotary scraping device into the inner cavity of the fixing device and the feed device, and make a threaded connection between the rotary feed sleeve handle 211 and the continuous oil pipe straightening sleeve 11 to complete the device assembly before operation.

[0049] The following section further explains the operation, maintenance, and adjustment processes of the device, as well as the cleaning and inspection processes after use.

[0050] A. Operating the rotary scraper

[0051] The feed sleeve handle 211 is rotated to feed the cutter head unit and perform continuous scraping operations. The cutter head unit is rotated by the cutter head rotation handle 34 to perform scraping.

[0052] B. Maintenance and Adjustment

[0053] Adjust the position of the cutter head as needed, using the upper and lower adjustment sleeves for fine-tuning, ensuring all components are securely fixed, especially the bearings and disc springs, to maintain tool stability and reduce friction.

[0054] C. Cleaning and inspection after use

[0055] After the scraping operation is completed, clean the debris from the cutter head and the inner wall of the continuous tube, check the wear of all parts, and replace or repair them if necessary.

[0056] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A scraping device for the inner end of a continuous tube, characterized in that, The device includes: a fixing unit, a feeding unit, a rotating unit, and a cutting head unit, wherein, The fixing unit includes a coiled tubing straightening sleeve and a fixing component. The coiled tubing straightening sleeve can be fitted onto the tail end of the coiled tubing and fixed by the fixing component. The feed unit includes a feed sleeve and a bearing assembly. The feed sleeve is threadedly connected to the coiled tubing centralizer sleeve. The bearing assembly is installed inside the rear end of the feed sleeve, with the rear end being the end facing away from the coiled tubing centralizer sleeve. The rotating unit includes a cutter head connecting rod and a rotating handle. The cutter head connecting rod is mounted on a bearing assembly and its rear end is located outside the feed sleeve cavity. The rotating handle is located at the rear end of the cutter head connecting rod. The cutter head unit is mounted on the front end of the cutter head connecting rod.

2. The continuous tube end scraping device according to claim 1, characterized in that, The fixing components include a locking clip and a locking clip cap.

3. The continuous tube end scraping device according to claim 2, characterized in that, Both the slip cap and the coiled tubing straightening sleeve are equipped with handles.

4. The continuous tube end scraping device according to claim 1, characterized in that, The bearing assembly includes a deep groove ball bearing, a first thrust ball bearing, a disc spring, a second thrust ball bearing, and a ball bearing cap arranged sequentially from front to back, wherein the direction from front to back is from the front end to the rear end of the feed sleeve.

5. The continuous tube end scraping device according to claim 4, characterized in that, The bearing assembly also includes a disc spring cap, which is located at the rear end of the disc spring and outside the second thrust ball bearing and the ball bearing cap.

6. The continuous tube end scraping device according to claim 1, characterized in that, The rotating unit also includes a feed centering ring, which is disposed inside the front end of the feed sleeve.

7. The continuous tube end scraping device according to claim 6, characterized in that, The rotating unit also includes an elastic mechanism, which is sleeved on the cutter head connecting rod and located between the feed centering ring and the bearing assembly.

8. The continuous tube end scraping device according to claim 7, characterized in that, The elastic mechanism includes a spring.

9. The continuous tube end scraping device according to claim 1, characterized in that, A handle is provided on the feed sleeve.

10. The continuous tube end scraping device according to claim 1, characterized in that, The cutter head unit includes a modular cutter head and a cutter head fixing frame. The cutter head fixing frame is provided with a lower cutter head adjusting sleeve and an upper cutter head adjusting sleeve, and the modular cutter head is located between the lower cutter head adjusting sleeve and the upper cutter head adjusting sleeve.

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