Oil pipe righting tool capable of being fixed and righting at any position

Abstract

The invention relates to an oil pipe righting tool capable of being fixed and righting at any position. The oil pipe centralizer mainly solves the problems that an existing oil pipe centralizer is insufficient in locking force and cannot centralize any position of an oil pipe. Which comprises an oil pipe (3) and is characterized in that a rigid centralizer (1) is arranged outside the oil pipe (3), a plurality of axial centralizing ribs (11) are arranged on the outer surface of the rigid centralizer (1), and a locking sleeve (2) is connected outside the rigid centralizer (1) in a threaded mode. The oil pipe righting tool capable of being fixed and righting at any position is simple in structure, large in locking force, adjustable in righting distance and capable of achieving fixed righting at any position of an oil pipe.

Description

Technical Field

[0001] The invention relates to the field of oil fields, in particular to an oil pipe straightening tool which can be fixed and straightened at any position. Background Art

[0002] During the oil well pumping process, in order to ensure that the oil pipe is centered in the casing and prevent the oil pipe from bending and causing eccentric wear of the rod and pipe, a tubing centralizer is usually installed on the oil pipe. If there are many deformation points in the oil well casing or the oil well has a large inclination angle, the requirements for tubing centralization will be more stringent, and the spacing of tubing centralization will become smaller, from installing one centralizer on each oil pipe to installing two or three centralizers. In this way, it is required to install a tubing centralizer at any position of each oil pipe and ensure that the centralizer is firmly fixed and locked on the oil pipe.

[0003] There are three main types of tubing centralizer structures at present: one is a structure in which two semicircular tubes with hinged shafts are clasped on the outer surface of the tubing and locked by a pin connection; the second is a hollow cylindrical structure that is directly sleeved on the tubing and can slide at any position of the tubing; the third is a short-circuit tubing centralizer structure that is directly connected to one end of the tubing and has a fixed position. The above tubing centralizers have the following problems: first, the locking force of the tubing centralizer is insufficient, and the tubing centralizer is easy to move on the tubing; second, it cannot realize the centralization of the tubing at any position; third, the tubing centralizer has a complex structure and high processing cost. Summary of the invention

[0004] In order to overcome the shortcomings of existing oil pipe straighteners that have insufficient locking force and cannot straighten the oil pipe at any position, the present invention provides an oil pipe straightening tool that can be fixed and straightened at any position. The oil pipe straightening tool that can be fixed and straightened at any position has a simple structure, a large locking force, and an adjustable straightening interval, so that the oil pipe can be fixed and straightened at any position.

[0005] The technical solution of the present invention is: a tubing straightening tool that can be fixed and straightened at any position, comprising an oil pipe, a rigid straightener is arranged outside the oil pipe, a plurality of axial straightening ribs are arranged on the outer surface of the rigid straightener, and a locking sleeve is threadedly connected to the outside of the rigid straightener.

[0006] The rigid centralizer comprises a main body, the centralizing ribs are located on the outer surface of the main body, one end of the main body opposite to the centralizing ribs is a centralizing cone sleeve with a conical outer surface, and an outer thread is arranged on the upper end of the centralizing cone sleeve.

[0007] The side wall of the centering cone sleeve is provided with two symmetrically arranged axial notches.

[0008] The outer surface of the external thread is connected to a locking sleeve, and the inner surface of the locking sleeve at one end opposite to the thread is a conical surface matched with the straightening cone sleeve.

[0009] The inner surface of the centralizing cone sleeve is provided with threads.

[0010] The outer wall of the main body between the straightening rib and the external thread is the pipe clamp bite surface.

[0011] The number of the straightening ribs is 3 and they are evenly distributed along the outer surface of the main body.

[0012] The cross section of the straightening rib is cylindrical and is welded to the outer surface of the main body.

[0013] The present invention has the following beneficial effects: due to the adoption of the above scheme, the outer surface of the rigid straightener is provided with cylindrical straightening ribs, which plays a role in straightening the oil pipe; the outer surface of the straightening cone sleeve is a conical surface, which cooperates with the inner conical surface of the locking sleeve through the conical surface, and at the same time, a thread is provided between the straightening cone surface and the locking sleeve, so that the locking sleeve can move along the outer conical surface of the straightening cone sleeve when rotating, and because the straightening cone sleeve is provided with a notch, the compression of the locking sleeve can make the outer conical surface diameter of the straightening cone sleeve smaller and smaller, so that it is tightly held on the surface of the oil pipe, and the tighter the locking sleeve is screwed, the greater the locking force. The inner surface of the straightening cone sleeve is processed with an internal thread, which increases the friction between the inner surface of the straightening cone sleeve and the outer surface of the oil pipe, and the inner surface of the straightening cone sleeve firmly holds the outer surface of the oil pipe, which can prevent the oil pipe straightening tool from moving on the oil pipe. The oil pipe straightening tool of the present invention has a simple structure and can be fixed at any position of each oil pipe. Each oil pipe can be installed with multiple oil pipe straightening tools, so that the spacing of the oil pipe straightening tools can be adjusted, the installation is convenient, time-saving and labor-saving, and the installation efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a top view of the present invention; Figure 2 is along Figure 1 Sectional view of AA in the middle; Figure 3 It is a structural schematic diagram of a rigid centralizer.

[0015] In the figure, 1-rigid centralizer, 2-locking sleeve, 3-oil pipe, 4-casing, 11-centralizing rib, 12-main body, 13-pipe clamp occlusal surface, 14-external thread, 15-centralizing cone sleeve, 16-notch. Implementation

[0016] The present invention will be further described below in conjunction with the accompanying drawings: Depend on Figures 1 to 3As shown, a tubing straightening tool that can be fixed and straightened at any position includes an oil pipe 3, and a rigid straightener 1 is arranged outside the oil pipe 3. The rigid straightener 1 includes a main body 12, and the outer surface of one end of the main body 12 is provided with a plurality of axial straightening ribs 11. One end of the straightening rib 11 is flush with the end of the main body 12, and the outer surface of the main body 12 at the other end is a pipe clamp bite surface 13, which is used to clamp the pipe clamp when the straightener tool is installed. The outer surface of the main body 12 at the end of the pipe clamp bite surface 13 is processed with an external thread 14, and the end of the main body 12 opposite to the straightening rib 11 is a straightening cone sleeve 15 with a tapered outer surface. The side wall of the straightening cone sleeve 15 is provided with an axial notch 16, and the notch 16 is 10 mm wide and 40 mm long, and there are two of them, which are symmetrically distributed along the side wall of the straightening cone sleeve 15. The inner surface of the straightening cone sleeve 15 is provided with a thread, and the thread here is used to increase the friction coefficient between the inner surface of the rigid straightener 1 and the outer surface of the oil pipe 2 to prevent up and down movement.

[0017] The number of the straightening ribs 11 is 3, which are evenly distributed along the outer surface of the main body 12. The cross-section of the straightening ribs 11 is cylindrical, with a diameter of 8 mm and a length of 150 mm. They are welded on the outer surface of the main body 12. The diameter R of the circumscribed circle where the straightening ribs 11 are located can reach 118 mm. The inner diameter of the 5-1 / 2" casing 4 of the oil well is 124 mm, so that the oil pipe can be centered and straightened in the casing 4.

[0018] The outer thread 14 of the rigid centralizer 1 is connected to the locking sleeve 2. One end of the locking sleeve 2 is processed with an inner thread matching the outer thread 14, and the inner surface of the other end is a conical surface. The taper of the conical surface is consistent with the taper of the outer conical surface of the centralizing cone sleeve 15, so that the locking sleeve can smoothly move along the outer conical surface of the centralizing cone sleeve of the rigid centralizer. At the same time, since the centralizing cone sleeve 15 is processed with a notch 16, when tightening the locking sleeve 2, the outer conical surface diameter of the centralizing cone sleeve can be made smaller and smaller, so that the outer conical surface of the centralizing cone sleeve is wedged into the inner conical surface of the locking sleeve to a certain depth as much as possible, ensuring that the inner thread surface of the centralizing cone sleeve can firmly hold the outer surface of the oil pipe 3, preventing the rigid centralizer from moving on the oil pipe 3.

[0019] Before lowering the tubing string during on-site operations, first determine the number of tubing straightening tools installed on each tubing 3, then sequentially put the rigid straightener 1 and the locking sleeve 2 on the tubing 3, and use a 48-inch pipe clamp to bite the pipe clamp engagement surface 13 of the rigid straightener 1 to prevent the rigid straightener 1 from rotating. The end of the locking sleeve 2 with the internal thread is rotated and advanced along the straightening cone sleeve 15 of the rigid straightener 1 and the external thread 14 of the rigid straightener 1. The diameter of the external cone surface of the straightening cone sleeve of the rigid straightener 1 becomes smaller and smaller, and finally almost completely wedges into the internal cone surface of the locking sleeve 2. Since the inner surface of the straightening cone sleeve 15 of the rigid straightener 1 has an internal thread with a certain tooth angle, the straightening cone sleeve 15 is tightly locked to the outer surface of the tubing 3 until the locking sleeve 2 cannot rotate. The installation of the second or third tubing straightening tool is the same as the above installation steps, and the tubing straightening tool installed on each tubing 3 should be installed according to the above installation steps. The tubing straightening tools on all tubings 3 should be installed before going down the well. All tubings 3 must be lowered slowly when passing through the wellhead of the pumping well, and can be lowered at a normal speed after passing through the wellhead.

Claims

1. A tubing straightening tool capable of being fixed and straightened at any position, comprising an tubing (3), Features: The oil pipe (3) is provided with a rigid centralizer (1) on the outside, a plurality of axial centralizer ribs (11) are provided on the outer surface of the rigid centralizer (1), and the rigid centralizer (1) is externally threadedly connected to a locking sleeve (2).

2. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 1, Features: The rigid centralizer (1) comprises a main body (12), the centralizing ribs (11) are located on the outer surface of the main body (12), and the end of the main body (12) opposite to the centralizing ribs (11) is a centralizing cone sleeve (15) with a conical outer surface, and the upper end of the centralizing cone sleeve (15) is provided with an external thread (14).

3. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 2, Features: The side wall of the centering cone sleeve (14) is provided with two symmetrically arranged axial notches (15).

4. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 3, Features: The outer surface of the external thread (14) is connected to the locking sleeve (2), and the inner surface of the end of the locking sleeve (2) opposite to the thread is a conical surface that matches the straightening cone sleeve (15).

5. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 4, Features: The inner surface of the centralizing cone sleeve (14) is provided with threads.

6. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 5, Features: The outer wall of the main body (12) between the straightening rib (11) and the external thread (14) is a pipe clamp engaging surface (13).

7. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 6, Features: The number of the straightening ribs (11) is three and they are evenly distributed along the outer surface of the main body (12).

8. The oil pipe straightening tool capable of being fixed and straightened at any position according to claim 7, Features: The cross section of the straightening rib (11) is cylindrical and is welded to the outer surface of the main body (12).

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