Anti-falling solid sucker rod for heavy oil high-temperature well

Abstract

An anti-falling solid sucker rod for a heavy oil high-temperature well relates to the technical field of sucker rods and comprises a lower-end rod head and an upper-end rod head which are arranged in parallel from top to bottom, a coupling is jointly connected between the lower-end rod head and the upper-end rod head in a threaded mode, a locknut is connected to the lower-end rod head in a threaded mode, and a conical stop sleeve is fixedly connected to the lower end of the locknut. A conical stop groove is formed in the inner ring of the upper end of the coupling, a plurality of deformation notches extending in the axial direction are formed in the conical stop sleeve in the circumferential direction, and the outer wall of the conical stop sleeve abuts against the conical stop groove. The anti-disengaging structure solves the problems that when an anti-disengaging structure in the prior art is used, due to the fact that the anti-disengaging structure bears large torsional stress, the anti-disengaging phenomenon occurs between an anti-disengaging nut and a coupling, the connecting position of a sucker rod is disengaged, and the stability in the oil pumping process is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of sucker rods, in particular to an anti-fall-off solid sucker rod for heavy oil high-temperature wells. Background Art

[0002] Due to the special wellbore structure of heavy oil and high temperature wells, the sucker rod anti-slip device of the sucker rod pump is subjected to large bending and torsional stresses during operation, causing the sucker rod anti-slip device connection to disengage.

[0003] The prior art discloses a patent with announcement number CN220705651U, which includes several sucker rods arranged vertically, with couplings threadedly connected between adjacent sucker rods, the lower end of the coupling abuts against the sucker rod below, and the upper end of the coupling is provided with a lock nut threadedly connected to the sucker rod above, and a circumferential limiting structure is provided between the butt ends of adjacent sucker rods, which solves the problem that the anti-detachment coupling in the traditional technology is easily loosened due to the rotational force of the sucker rod during use; and the existing anti-detachment coupling is prone to relative rotation between adjacent sucker rods when connecting two adjacent sections of sucker rods, thereby exacerbating the problem of disengagement.

[0004] As the device of the above patent is used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] First, when the existing anti-slip structure is in use, when the anti-loosening nut is screwed, the gap in the compensation ring groove is easily increased after being stressed, resulting in a reduction in the locking force between the threaded locking ring section and the upper thread, which is prone to disengagement.

[0006] Second, the two anti-loosening washers are stopped by the helical tooth protrusions. Since the contact area between the two anti-loosening washers is small, the anti-loosening performance is poor and the phenomenon of tripping occurs.

[0007] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0008] In response to the defects in the existing technology, the utility model solves the problem that when the anti-slip structure in the traditional technology is in use, when the anti-loosening nut is screwed, the gap in the compensation ring groove is easily increased after the force is applied, resulting in a reduction in the locking force between the threaded locking ring section and the upper thread, and the problem of easy disengagement.

[0009] In order to solve the above problems, the present invention provides the following technical solutions:

[0010] An anti-slip solid sucker rod for heavy oil and high-temperature wells comprises a lower rod head and an upper rod head arranged in parallel from top to bottom, a coupling being threadedly connected between the lower rod head and the upper rod head, a locking nut being threadedly connected to the lower rod head, a conical stop sleeve being fixedly connected to the lower end of the lock nut, a conical stop groove being provided on the inner ring of the upper end of the coupling, a plurality of deformation notches extending in the axial direction being provided on the conical stop sleeve along the circumferential direction, and an outer wall of the conical stop sleeve being against the conical stop groove.

[0011] As an optimized solution, a circumferential limiting structure is provided on the opposite ends of the lower rod head and the upper rod head.

[0012] As an optimized solution, the conical stop sleeve and the anti-loosening nut are both provided with an open groove along the axial direction.

[0013] As an optimized solution, four deformation notches are evenly distributed along the circumference.

[0014] As an optimized solution, a wrench groove is provided on the outer wall of the coupling.

[0015] As an optimized solution, the circumferential limiting structure includes semicircular clamping blocks respectively fixed to the end portions of the lower rod head and the upper rod head, and the two semicircular clamping blocks are arranged opposite to each other.

[0016] As an optimized solution, a platform is fixedly connected to the upper end rod head and abuts against the lower end of the coupling.

[0017] As an optimized solution, the upper end rod head is provided with an upper end connecting thread which is threadedly connected to the coupling.

[0018] As an optimized solution, the lower end rod head is provided with a lower end connecting thread that is threadedly connected to the coupling and the anti-loosening nut.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] When in use, first screw the coupling and the anti-loosening nut onto the lower rod head, then align the lower rod head with the upper rod head, screw the coupling downward so that the lower end of the coupling contacts the stage, and then screw the anti-loosening nut downward. When the anti-loosening nut is tightened, the conical stop sleeve contacts the conical stop groove to generate radial extrusion force, and the deformation notch on the anti-loosening nut begins to deform, forming additional friction, so that the conical stop sleeve completely locks the lower end connecting thread, thereby achieving permanent anti-loosening, simple structure and fast assembly;

[0021] This structure not only overcomes the problems caused by the compensation ring groove and the anti-loosening washer in the prior art structure, but also simplifies the structure and makes assembly more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 This is a structural diagram of the utility model when the coupling and the anti-loosening nut are tightened;

[0025] Figure 3 It is a structural schematic diagram of the utility model when the coupling and the anti-loosening nut are not tightened.

[0026] In the figure: 1-lower end rod head; 2-upper end rod head; 3-coupling; 4-locking nut; 5-conical stop sleeve; 6-conical stop groove; 7-semicircular block; 8-upper end connecting thread; 9-lower end connecting thread; 10-stage; 11-deformation notch; 12-opening groove. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0028] like Figures 1 to 3 As shown, a solid sucker rod with anti-slippage for heavy oil and high-temperature wells includes a lower rod head 1 and an upper rod head 2 arranged in parallel from top to bottom, a coupling 3 is threadedly connected between the lower rod head 1 and the upper rod head 2, a locking nut 4 is threadedly connected to the lower rod head 1, a conical stop sleeve 5 is fixed to the lower end of the lock nut 4, a conical stop groove 6 is provided on the inner ring of the upper end of the coupling 3, a plurality of deformation notches 11 extending axially are provided on the conical stop sleeve 5 along the circumferential direction, and the outer wall of the conical stop sleeve 5 abuts against the conical stop groove 6.

[0029] Circumferential limiting structures are provided on the opposite ends of the lower rod head 1 and the upper rod head 2.

[0030] The conical stop sleeve 5 and the lock nut 4 are both provided with an open slot 12 along the axial direction.

[0031] There are four deformation notches 11 evenly distributed along the circumferential direction.

[0032] A wrench groove is provided on the outer wall of the coupling 3.

[0033] The circumferential limiting structure includes semicircular clamping blocks 7 respectively fixed to the ends of the lower rod head 1 and the upper rod head 2, and the two semicircular clamping blocks 7 are arranged opposite to each other.

[0034] A platform 10 is fixedly connected to the upper end rod head 2 and abuts against the lower end of the coupling 3.

[0035] The upper end rod head 2 is provided with an upper end connecting thread 8 which is threadedly connected to the coupling 3 .

[0036] The lower end rod head 1 is provided with a lower end connecting thread 9 which is threadedly connected to the coupling 3 and the anti-loosening nut 4.

[0037] The working principle of this device is:

[0038] When in use, first screw the coupling 3 and the anti-loosening nut 4 onto the lower end rod head 1, then align the lower end rod head 1 with the upper end rod head 2, screw the coupling 3 downward so that the lower end of the coupling 3 is against the stage 10, and then screw the anti-loosening nut 4 downward. When the anti-loosening nut 4 is tightened, the conical stop sleeve 5 contacts the conical stop groove 6 to generate radial extrusion force, and the deformation notch 11 on the anti-loosening nut 4 begins to deform, forming additional friction, so that the conical stop sleeve 5 completely locks the lower end connecting thread 9, thereby achieving permanent anti-loosening, simple structure and fast assembly.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. Anti-sucking solid sucker rod for heavy oil high temperature wells, characterized by: The invention comprises a lower rod head (1) and an upper rod head (2) arranged in parallel from top to bottom, wherein a coupling (3) is threadedly connected between the lower rod head (1) and the upper rod head (2), a locking nut (4) is threadedly connected to the lower rod head (1), a conical stop sleeve (5) is fixed to the lower end of the locking nut (4), a conical stop groove (6) is provided on the inner ring of the upper end of the coupling (3), a plurality of deformation notches (11) extending in the axial direction are provided on the conical stop sleeve (5), and the outer wall of the conical stop sleeve (5) abuts against the conical stop groove (6).

2. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: Circumferential limiting structures are provided on the opposite ends of the lower rod head (1) and the upper rod head (2).

3. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: The conical stop sleeve (5) and the anti-loosening nut (4) are both provided with an open slot (12) extending through the axial direction.

4. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: There are four deformation notches (11) evenly distributed along the circumference.

5. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: A wrench groove is provided on the outer wall of the coupling (3).

6. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 2, characterized in that: The circumferential limiting structure comprises semicircular clamping blocks (7) respectively fixed to the ends of the lower rod head (1) and the upper rod head (2), and the two semicircular clamping blocks (7) are arranged opposite to each other.

7. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: A platform (10) is fixedly connected to the upper end rod head (2) and abuts against the lower end of the coupling (3).

8. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: The upper end rod head (2) is provided with an upper end connecting thread (8) threadedly connected to the coupling (3).

9. The anti-sucking solid sucker rod for heavy oil high-temperature wells according to claim 1, characterized in that: The lower end rod head (1) is provided with a lower end connecting thread (9) that is threadably connected to the coupling (3) and the anti-loosening nut (4).

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