Wellhead oil pipe centralizing anti-scraping and anti-collision device

Abstract

The utility model discloses a wellhead oil pipe centralizing anti-scratch device which comprises a fixing sleeve, a first centralizing sleeve and a second centralizing sleeve, the fixing sleeve is in a sleeve shape with an I-shaped longitudinal section, flange plates are arranged on the upper plane and the lower plane of the I shape, the first centralizing sleeve and the second centralizing sleeve are installed and fixed on the inner wall of the fixing sleeve, the diameter of the inner wall of the fixing sleeve is the same as that of the outer wall of the second centralizing sleeve, and when the centralizing sleeves are not installed, the diameter of the inner wall of the fixing sleeve, namely the drift diameter is consistent with that of a wellhead blowout preventer. A large-diameter tool can pass through; the lower plane of the fixing sleeve is of a flange plate structure and is installed on the blowout preventer through bolts. The lower end of the inner wall of the first centralizing sleeve is a horn mouth; a disc concave surface is formed in the upper plane of a flange plate of the fixing sleeve and is used for placing the first centralizing sleeve and the second centralizing sleeve.

Description

Technical Field

[0001] The utility model relates to an oil well construction tool, in particular to a wellhead tubing straightening and anti-scratching device. Background Technique

[0002] During the oilfield development process, downhole fish falling accidents are relatively common, such as the "CN2023222534405 A tubing fishing tool suitable for small hole flat fish top" of the applicant; well workover fishing operations need to be carried out for treatment. Usually, a blowout preventer group is installed on the wellhead four-way to ensure well control safety, and a workover rig is used to trip the pipe string. However, during the process of tripping the pipe string, due to the swaying of the big hook of the workover rig and the inconsistent inner diameters of the oil layer casing, the wellhead four-way, and the wellhead blowout preventer, the tubing collar is likely to scratch the wellhead equipment when pulling out the pipe string, posing a safety hazard.

[0003] Especially for the downhole fish falling pipe string, under the influence of factors such as downhole corrosion, fishing, and releasing stuck operations, the strength of the pipe string or the strength of the thread connection may be reduced. In this case, the fished fish falling pipe string may fall into the well again, thus exacerbating the complexity of subsequent construction and prolonging the operation cycle.

[0004] Therefore, a wellhead tubing straightening and anti-scratching device has been developed. This device is located above the blowout preventer. When the pipe string is lifted to the wellhead position, it has the functions of straightening the tubing and preventing the tubing collar from scratching the wellhead equipment. It is used for tripping the pipe string.

[0005] After the existing tubing straightening device is installed, it is impossible to pass through the straightening device when lifting a fishing tool or a downhole large-diameter tool, and it does not have the function of preventing the wellhead equipment from being scratched. Content of the Utility Model

[0006] The purpose of the utility model is to solve the deficiencies of the above tools and develop a wellhead tubing straightening and anti-scratching device.

[0007] The technical solution of the utility model is a wellhead tubing straightening and anti-scratching device, which includes a fixed sleeve, a first straightening sleeve, and a second straightening sleeve; the fixed sleeve is in a sleeve shape with an I-shaped longitudinal section. The upper and lower planes of the I-shape are both flange plates. The first straightening sleeve and the second straightening sleeve are installed and fixed on the inner wall of the fixed sleeve. The inner diameter of the fixed sleeve is the same as the outer diameter of the first and second straightening sleeves. When the straightening sleeves are not installed, the inner diameter of the fixed sleeve, that is, the through diameter, is the same as that of the wellhead blowout preventer, and large-diameter tools can pass through; the lower plane of the fixed sleeve is a flange plate structure and is installed on the blowout preventer through bolts; the lower end of the inner wall of the first straightening sleeve is a flared mouth;

[0008] On the upper plane of the flange of the fixed sleeve, a disc concave surface is opened. On the symmetric two sides of the diameter position of the disc concave surface, two positioning block grooves (which can place positioning blocks and play the role of coupling pins) are opened for placing the first and second centralizing sleeves. After the positioning blocks of the first and second centralizing sleeves are seated in the positioning block grooves of the fixed sleeve, the first and second centralizing sleeves are installed as semi-cylinders and combined into a cylinder.

[0009] Safety pin holes are provided on both side walls of the fixed sleeve and on the side walls of the first centralizing sleeve 1 and the second centralizing sleeve 2, and the safety pin holes on both side walls of the fixed sleeve are on the same axis as the safety pin holes on the side walls of the first centralizing sleeve 1 and the second centralizing sleeve 2. The upper planes of both side walls of the fixed sleeve and the first centralizing sleeve 1 and the second centralizing sleeve 2 are on the same horizontal plane. At this time, the tubing elevator is placed on the upper plane of the fixed sleeve; a safety pin can be inserted into the safety pin hole; after the first centralizing sleeve 1 and the second centralizing sleeve 2 are placed into the fixed sleeve, the safety pin is inserted into the safety pin hole, thereby fixing the first centralizing sleeve 1 and the second centralizing sleeve.

[0010] The working principle of the present utility model: Before construction, the fixed sleeve 6 is installed on the wellhead blowout preventer through flange bolts; when fishing out the dropped tubing for construction, in accordance with Figure 7 Install a wellhead tubing centralizing and anti-scratching device. Assembly steps: Use lifting wires to lift the first centralizing sleeve 1 and the second centralizing sleeve 2 respectively and seat them in the fixed sleeve, align the positions of the centralizing blocks and the centralizing block grooves, and insert the safety pins on both sides. The upper plane of the wellhead tubing centralizing and anti-scratching device is a horizontal plane, and the tubing elevator can be placed on it. When the elevator suspends the tubing, a hydraulic tong can be used to release the connection.

[0011] The principle of centralizing and anti-scratching: Since the through diameter of the centralizing device is smaller than the inner diameters of the production casing, the wellhead four-way, and the wellhead blowout preventer, that is, the annular space outside the tubing is reduced. When pulling out the tubing string, the moving range of the tubing string is reduced, which has a certain centralizing function. When the tubing passes through the production casing, the wellhead four-way, and the wellhead blowout preventer in sequence, it can prevent the tubing coupling from scratching the wellhead equipment such as the wellhead four-way and the wellhead blowout preventer; at the same time, after the centralizing sleeve is seated, the lower part is a flared structure, which has a certain guide shoe function when the tubing coupling passes through, and it is a wellhead tubing centralizing and anti-scratching device that prevents scratching.

[0012] When lifting a large-diameter tool, when the large-diameter tool is lifted to below a wellhead tubing centralizing and anti-scratching device, pull out the safety pin, and use the lifting wire to lift out the first centralizing sleeve 1 and the second centralizing sleeve 2. Since the inner diameter of the fixed sleeve is the same as the inner diameter of the blowout preventer, the large-diameter tool can pass through.

[0013] Beneficial effects: The device has the functions of tubing centralizing and preventing the tubing coupling from scraping against the wellhead equipment: During the process of tripping the tubing string, despite the swaying of the traveling block of the workover equipment, the tubing coupling is not likely to scrape against the wellhead equipment when pulling out the tubing string; The centralizing device of the present utility model can be passed through when fishing tools or large-diameter downhole tools are tripped, especially during the tripping of the tubing string; The centralizing sleeve is replaceable, and by replacing centralizing sleeves of various sizes, different sizes of tubing can be accommodated. The structure is simple, easy to process, and convenient for on-site disassembly and assembly. The first centralizing sleeve 1 and the second centralizing sleeve 2 are placed in the fixed sleeve 6 to perform the functions of centralizing the tubing and preventing the tubing coupling from scraping against the wellhead equipment; The flange 7 and the screw hole 8 are provided at the lower end of the fixed sleeve 6. Description of the Drawings

[0014] Figure 1 It is a structural diagram of the fixed sleeve;

[0015] Figure 2 It is a sectional view of the fixed sleeve at position A-A (with the centralizing sleeve);

[0016] Figure 3 It is a structural diagram of the first centralizing sleeve 1 and the second centralizing sleeve 2;

[0017] Figure 4 It is a sectional view of the first centralizing sleeve 1 at position A-A;

[0018] Figures 5 - 6 They are respectively sectional views of the safety pin 9 and the lifting wire 10;

[0019] Figure 7 It is an assembled sectional structural diagram of the wellhead tubing centralizing and anti-scraping device of the present utility model. Detailed Implementation Manner

[0020] The first centralizing sleeve 1 and the second centralizing sleeve 2 are of symmetrical structure, the upper plane is a semi-disc (flange), a positioning block 3 is designed below the semi-disc, and a lifting wire screw hole 4 is designed above the disc, which is convenient for lifting and lowering after screwing in the lifting wire;

[0021] The safety pin hole 5 can insert a safety pin;

[0022] After the centralizing sleeve is placed in the fixed sleeve, the through diameter is reduced. The design requirement is that the through diameter is 10 - 12 mm larger than the outer diameter of the tubing coupling; Moreover, the lower part of the centralizing sleeve is of arc structure, and the lower part is in a flared shape after the centralizing sleeve is placed, so that the tubing coupling will not be scraped when passing through.

[0023] Other accessories: safety pin and lifting wire. Figures 5 - 6 They are respectively the structures of the safety pin 9 and the lifting wire 10, and the external thread 10 - 1 on the lifting wire; The safety pin: fixes the centralizing sleeve in the fixed sleeve;

[0024] The lifting wire: is used for lifting and lowering the centralizing sleeve.

[0025] The above embodiments do not limit the present utility model in any way. Any other improvements and applications made to the above embodiments by equivalent transformation methods fall within the protection scope of the present utility model.

Claims

1. A wellhead tubing centralizer and anti-scratching and anti-collision device, characterized in that It includes a fixed sleeve, a first centralizing sleeve, and a second centralizing sleeve; the fixed sleeve is in a sleeve shape with an I-shaped longitudinal section. The upper and lower planes of the I-shape are both flange plates. The first centralizing sleeve and the second centralizing sleeve are installed and fixed on the inner wall of the fixed sleeve. The inner diameter of the fixed sleeve is the same as the outer diameter of the first and second centralizing sleeves. When the centralizing sleeves are not installed, the inner diameter of the fixed sleeve, i.e., the through-diameter, is consistent with that of the wellhead blowout preventer, and large-diameter tools can pass through; the lower plane of the fixed sleeve is a flange plate structure and is installed on the blowout preventer through bolts; the lower end of the inner wall of the first centralizing sleeve is a flared opening; a disc concave surface is opened on the upper plane of the flange plate of the fixed sleeve, and two positioning block grooves are opened on the symmetric sides of the diameter position of the disc concave surface for placing the first centralizing sleeve and the second centralizing sleeve. After the positioning blocks of the first centralizing sleeve and the second centralizing sleeve are seated in the positioning block grooves of the fixed sleeve, the first centralizing sleeve and the second centralizing sleeve are installed as semi-cylinders and combined into a cylinder.

2. The wellhead tubing straightening and anti-scraping device according to claim 1, characterized in that, Safety pin holes are provided on both side walls of the fixed sleeve and the side walls of the first centralizing sleeve and the second centralizing sleeve, and the safety pin holes on both side walls of the fixed sleeve are on the same axis as the safety pin holes on the side walls of the first centralizing sleeve and the second centralizing sleeve. The upper planes of both side walls of the fixed sleeve and the first centralizing sleeve and the second centralizing sleeve are on the same horizontal plane. At this time, the upper plane of the fixed sleeve seats the tubing elevator; after the first centralizing sleeve and the second centralizing sleeve are seated in the fixed sleeve, safety pins are inserted into the safety pin holes, thereby fixing the first centralizing sleeve and the second centralizing sleeve in the fixed sleeve.

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