Sucker rod assembly

Abstract

The application discloses an oil pumping rod assembly, which comprises a rod body and a coupling. The rod body comprises a first joint, a first rod body and a second joint which are sequentially connected. The first joint and the second joint are both provided with external threads and are of the same type. The two end faces of the rod body are respectively provided with a convex part and an inner recess part, so that the adjacent two rod bodies can be adjusted by the way of inserting the convex part into the inner recess part. The coupling is provided with internal threads which are matched with the external threads, so that the adjacent two rod bodies can be connected through the coupling. Compared with the prior art, the oil pumping rod assembly can connect the adjacent two rod bodies through the coupling, so that the overall length of the oil pumping rod assembly can be adjusted to adapt to oil wells with different depths.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil extraction, in particular to an oil pumping rod assembly. BACKGROUND

[0002] The continuous oil pumping rod is a large-length oil pumping rod made on a special production line by a special process, the length of which can be selected according to the depth of the well, and there is no thread and coupling in the middle. In use, the friction between the coupling part and the pipe wall can be avoided, and the problem of decoupling does not occur. In actual use, the special operation vehicle carries the continuous oil pumping rod with a length greater than the depth of the well each time, and the continuous oil pumping rod is cut off at the appropriate position after repeated tests according to the specific well depth on site. Therefore, when using the continuous oil pumping rod, on-site fire operation is often required, which has safety hazards. SUMMARY

[0003] The purpose of the present application is to provide an oil pumping rod assembly which can be connected in series to the appropriate length according to the actual well depth on site to avoid on-site fire operation.

[0004] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0005] The present application discloses an oil pumping rod assembly, comprising:

[0006] A rod body, the rod body comprises a first joint, a first rod body and a second joint connected in sequence; the first joint and the second joint are both provided with external threads and are of the same type; both end faces of the rod body are respectively provided with a protruding part and an inner recess part, so that the adjacent two rod bodies can be aligned by means of inserting the protruding part and the inner recess part;

[0007] A coupling, the coupling has an internal thread matched with the external thread, so that the adjacent two rod bodies can be connected through the coupling.

[0008] Preferably, it further comprises a spare cap, the spare cap has an internal thread matched with the external thread; the first rod body is provided with a positioning shoulder;

[0009] When the adjacent two rod bodies are connected through the coupling, the two ends of the coupling are respectively abutted with the positioning shoulder on one of the rod bodies and the spare cap outside the other rod body, so as to limit the position of the coupling.

[0010] Preferably, the outside of the spare cap is provided with an anti-injury groove, which is an annular groove coaxial with the spare cap.

[0011] Preferably, the two ends of the positioning shoulder are respectively provided with a positioning face and a transition face, and the positioning face is used for abutting with the coupling for limiting.

[0012] Preferably, the anti-disengagement structure is provided, and the anti-disengagement structure has a minimum diameter equal to that of the sucker rod assembly, so that when the sucker rod assembly is blocked, the anti-disengagement structure is pulled off first.

[0013] Preferably, the anti-disengagement structure comprises:

[0014] The first connecting rod comprises a third joint, a second rod body and a fourth joint connected in sequence, the third joint is spherical, the second rod body is provided with a disengagement and breakage groove coaxial with the second rod body, the disengagement and breakage groove has a diameter smaller than that of the rod body and equal to that of the first connecting rod, so that when the sucker rod assembly is blocked, the disengagement and breakage groove is pulled off first, and the fourth joint is provided with an external thread matched with the internal thread of the coupling, so that the first connecting rod can be connected with the rod body through the coupling.

[0015] The guide sleeve is provided with a spherical surface at one end for ball joint connection with the third joint, and is provided with an internal thread at the other end.

[0016] The second connecting rod is provided with an external thread at the first end matched with the internal thread of the guide sleeve.

[0017] Preferably, the second end of the second connecting rod is provided with an external thread, and the center of the end face of the second end of the second connecting rod is provided with a receptacle.

[0018] Preferably, the external thread of the second end of the second connecting rod is matched with the internal thread of the coupling, so that the second connecting rod can be connected with the rod body through the coupling, and the receptacle of the second end of the second connecting rod is the same as the internal recess structure, and the center of the end face of the fourth joint of the first connecting rod is provided with a plug matched with the protruding structure.

[0019] The present application has the following technical effects compared with the prior art:

[0020] In use, the adjacent two rod bodies can be connected through the coupling, so that the overall length of the sucker rod assembly can be adjusted to adapt to oil wells of different depths, and the on-site fire operation for adjusting the overall length can be avoided. In the preferred scheme of the present application, the two ends of the coupling are respectively abutted against the positioning shaft shoulder on one rod body and the spare cap on the outer side of the other rod body, so as to limit the position of the coupling. In the preferred scheme of the present application, the anti-disengagement structure is further provided, and when the sucker rod assembly is blocked, the anti-disengagement structure is pulled off first, so that the damage of the threaded connection part can be avoided, and the anti-disengagement structure only needs to be replaced after being pulled off. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present application shall fall within the protection scope of the present application.

[0022] Fig. 1 A structure diagram of the sucker rod assembly in the embodiment;

[0023] Fig. 2 Another structure diagram of the sucker rod assembly in the embodiment;

[0024] Fig. 3 A diagram of the anti-disengagement and anti-jamming structure;

[0025] Fig. 4 A position diagram of the sucker rod assembly in the oil pumping well in the embodiment;

[0026] Explanation of reference signs:

[0027] 1-rod body; 11-first joint; 111-internal concave part; 12-first rod body; 121-positioning shoulder; 1211-positioning surface; 1212-transition surface; 13-second joint; 131-protruding part;

[0028] 2-coupling;

[0029] 3-reserve cap; 31-anti-injury groove;

[0030] 4-first connecting rod; 41-third joint; 42-second rod body; 421-anti-jamming and anti-disengagement groove; 43-fourth joint; 431-insertion rod;

[0031] 5-guide sleeve; 51-anti-scraping chamfer;

[0032] 6-second connecting rod; 61-insertion hole;

[0033] A-sucker rod assembly; a-anti-disengagement and anti-jamming structure. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative work shall fall within the protection scope of the present application.

[0035] The present application aims to provide a sucker rod assembly which can be connected in series to a proper length according to the actual well depth on site to avoid on-site fire operation.

[0036] In order to make the above objectives, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] With reference to Figs. 1-4 , the embodiment provides an oil pumping rod assembly, which comprises a rod body 1 and a coupling 2. The rod body 1 comprises a first joint 11, a first rod body 12 and a second joint 13 connected in sequence. The first joint 11 and the second joint 13 are both provided with external threads and are of the same type. Two end faces of the rod body 1 are respectively provided with a protruding part 131 and an inner recess part 111, which are coaxial with the rod body 1, so that the adjacent two rod bodies 1 can be aligned by means of insertion. The coupling 2 is provided with internal threads matched with the external threads, so that the adjacent two rod bodies 1 can be connected by means of the coupling 2.

[0038] In the embodiment, the inner recess part 111 is located at the first joint 11, and the protruding part 131 is located at the second joint 13. According to different actual needs, the inner recess part 111 can also be located at the second joint 13, and the protruding part 131 can also be located at the first joint 11. That is, the coupling 2 can be more conveniently rotated and moved from one rod body 1 to another rod body 1 by means of the insertion alignment.

[0039] In use, the adjacent two rod bodies 1 can be connected by means of the coupling 2, so as to adjust the overall length of the oil pumping rod assembly A to adapt to oil wells of different depths. When the oil pumping rod assembly A is connected in series, the coupling 2 is first threadedly connected to the second joint 13 of one rod body 1, then the protruding part 131 of the second joint 13 of the rod body 1 is inserted into the inner recess part 111 of the first joint 11 of another rod body 1, and then the coupling 2 is rotated to be threadedly connected to the two rod bodies 1 at the same time.

[0040] As a possible example, in the embodiment, the oil pumping rod assembly A further comprises a backup cap 3, which is provided with internal threads matched with the external threads. The first rod body 12 is provided with a positioning shoulder 121. When the adjacent two rod bodies 1 are connected by means of the coupling 2, the two ends of the coupling 2 are respectively abutted against the positioning shoulder 121 on one rod body 1 and the backup cap 3 outside the other rod body 1, so as to limit the position of the coupling 2.

[0041] As a possible example, in the embodiment, the outside of the backup cap 3 is provided with an anti-injury groove 31, which is an annular groove coaxial with the backup cap 3. When the backup cap 3 is rotated, the pipe tongs only clamp the side of the anti-injury groove 31 on the backup cap 3 away from the coupling 2, so as to avoid damaging the contact end face of the backup cap 3 and the coupling 2.

[0042] As a possible example, in the embodiment, the two ends of the positioning shaft shoulder 121 are respectively provided with a positioning surface 1211 (perpendicular to the axis of the rod body 1) and a transition surface 1212, the positioning surface 1211 is used to abut against the coupling 2, and the transition surface 1212 is a curved surface.

[0043] As a possible example, in the embodiment, the anti-disengagement structure a is further included. The minimum diameter of the anti-disengagement structure a is the minimum diameter of the sucker rod assembly A. When the sucker rod assembly A encounters a blockage, the anti-disengagement structure a is first broken, which can avoid damage to the threaded connection part, and only the anti-disengagement structure a needs to be replaced after being broken.

[0044] As a possible example, in the embodiment, the anti-disengagement structure a includes a first connecting rod 4, a guide sleeve 5, and a second connecting rod 6. The first connecting rod 4 includes a third joint 41, a second rod body 42, and a fourth joint 43 connected in sequence. The third joint 41 is spherical, and the second rod body 42 is provided with a disengagement and breaking groove 421 coaxial with the second rod body 42. The diameter at the disengagement and breaking groove 421 is the minimum diameter of the first connecting rod 4 and is smaller than the minimum diameter of the rod body 1, so that when the sucker rod assembly A encounters a blockage, the disengagement and breaking groove 421 is first broken. The fourth joint 43 is provided with external threads matched with the internal threads of the coupling 2, so that the first connecting rod 4 can be connected with the rod body 1 through the coupling 2. The guide sleeve 5 is provided with a spherical surface on one end for ball hinge connection with the third joint 41. The other end of the guide sleeve 5 is provided with internal threads. The first end of the second connecting rod 6 is provided with external threads matched with the internal threads of the guide sleeve 5. According to different actual needs, those skilled in the art can also select other types of anti-disengagement structures a, such as an anti-disengagement structure a including a breaking pin. In order to reduce friction, the guide sleeve 5 is provided with an anti-scraping chamfer 51.

[0045] As a possible example, the side surface of the second end of the second connecting rod 6 is provided with external threads, that is, the connection mode of the second connecting rod 6 and other structures is threaded connection. The center of the end face of the second end of the second connecting rod 6 is provided with a insertion hole 61, so that the second connecting rod 6 and other structures are aligned by insertion.

[0046] As a possible example, the external thread of the second end of the second connecting rod 6 matches the internal thread of the coupling 2, allowing the second connecting rod 6 to be connected to the stem 1 through the coupling 2. The socket 61 of the second end of the second connecting rod 6 is identical in structure to the internal recess 111, allowing the protrusion 131 on the stem 1 to be inserted into the socket 61 of the second connecting rod 6, thereby aligning (coaxially) the second connecting rod 6 with the stem 1 when the second connecting rod 6 is connected to the stem 1 through the coupling 2. The end surface of the fourth joint 43 of the first connecting rod 4 is provided with a plug 431 identical in structure to the protrusion 131, allowing the plug 431 of the first connecting rod 4 to be inserted into the internal recess 111 of the stem 1, thereby aligning (coaxially) the first connecting rod 4 with the stem 1 when the first connecting rod 4 is connected to the stem 1 through the coupling 2.

[0047] The principles and implementation manners of the present application are described in the specification by applying specific examples, and the above description of the examples is only for helping to understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application ranges. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A sucker rod assembly, characterized in that, include: The rod body includes a first connector, a first rod body, and a second connector connected in sequence; both the first connector and the second connector are provided with external threads and are of the same type; the two end faces of the rod body are respectively provided with a protrusion and a concave portion, so that two adjacent rod bodies can be aligned by inserting the protrusion and the concave portion; A coupling having an internal thread that matches the external thread, so that two adjacent rods can be connected by the coupling; The anti-disengagement and anti-jamming structure has a minimum diameter equal to the minimum diameter of the sucker rod assembly, so that when the sucker rod assembly encounters obstruction, the anti-disengagement and anti-jamming structure is broken first. The anti-detachment and card-unlocking structure includes: The first connecting rod includes a third connector, a second rod body, and a fourth connector connected in sequence. The third connector is spherical. The second rod body has a release groove coaxial with the second rod body. The diameter of the release groove is the minimum diameter of the first connecting rod and smaller than the minimum diameter of the rod body, so that when the sucker rod assembly encounters obstruction, the release groove is broken first. The fourth connector has an external thread that matches the internal thread of the coupling, so that the first connecting rod can be connected to the rod body through the coupling. The release groove is arranged adjacent to the third connector. The guide sleeve has a spherical surface on the inner side of one end for forming a ball joint connection with the third connector; the inner side of the other end of the guide sleeve has an internal thread; and the guide sleeve has a scratch-resistant chamfer. The second connecting rod has an external thread at its first end that matches the internal thread of the guide sleeve.

2. The sucker rod assembly according to claim 1, characterized in that, It also includes a spare cap having an internal thread that matches the external thread of the rod body; the first rod body is provided with a positioning shoulder; When two adjacent rods are connected by the coupling, the two ends of the coupling abut against the positioning shoulder on one rod and the spare cap on the outside of the other rod, respectively, to restrict the position of the coupling.

3. The sucker rod assembly according to claim 2, characterized in that, The outer side of the spare cap is provided with an anti-pinch groove, which is an annular groove coaxial with the spare cap.

4. The sucker rod assembly according to claim 2, characterized in that, The two ends of the positioning shoulder are respectively provided with a positioning surface and a transition surface, and the positioning surface is used to abut against the clamp limit.

5. The sucker rod assembly according to claim 1, characterized in that, The second end of the second connecting rod has an external thread on its side, and the end face of the second end of the second connecting rod has an insertion hole at its center.

6. The sucker rod assembly according to claim 5, characterized in that, The external thread at the second end of the second connecting rod matches the internal thread of the coupling, so that the second connecting rod and the rod body can be connected through the coupling; the insertion hole at the second end of the second connecting rod is the same as the concave structure, and the end face center of the fourth connector of the first connecting rod is provided with an insertion rod with the same structure as the protruding part.

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