Sucker rod coupling

Abstract

The utility model provides a sucker rod coupling, which belongs to the technical field of oil extraction in oil fields and is characterized in that a body is provided with an insertion hole, the insertion hole is arranged along the length direction of the body, an internal thread is arranged in the insertion hole, the sucker rod coupling further comprises a sleeve, and the sleeve is sleeved on the body; in order to achieve compression resistance and bending resistance of a sucker rod coupling, the structure of the sucker rod coupling needs to be strong enough to meet the corrosion resistance, but steel or alloy steel is generally adopted, but the cost of the steel or the alloy steel is high; if an anti-corrosion coating is arranged on the surface of an iron body, although the use requirement can be met, the anti-corrosion capacity is lost after the anti-corrosion coating is damaged or abraded, the whole sucker rod coupling is corroded immediately, and potential safety hazards are large in the use process.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field production, in particular to a series of sucker rod couplings for oil production. Background Art

[0002] In oil extraction, sucker rods are needed to pump underground crude oil into the oil pipeline. Both ends of the sucker rods have external threads for connecting the surface equipment of the pumping unit and the pumping device at the bottom of the pumping unit. As the oil well extends downward, it is necessary to continuously add sucker rod couplings, which are key components for connecting the sucker rods. Sucker rods are connected with couplings. During the pumping process, they not only have to withstand huge pressure, twisting and bending, but also require high wear resistance to resist corrosion from various chemicals such as oil and water.

[0003] In the development of oil, the formation conditions are very complex, and a large number of blocks are severely corroded. Therefore, there is an urgent need for a pumping rod coupling that has the ability to resist compression, distortion, wear and corrosion. Utility Model Content

[0004] In view of this, the utility model proposes a method of connecting a sleeve outside a body to achieve corrosion protection of the outer surface and compression and bending resistance of the body.

[0005] The technical solution of the utility model is implemented as follows: a sucker rod coupling, comprising a body, a plug-in hole is arranged on the body, the plug-in hole is arranged along the length direction of the body, an internal thread is arranged in the plug-in hole, and also comprises a main tube, the main tube is sleeved on the body, one end of the main tube is bent into one end of the plug-in hole, and the other end of the main tube is bent into the other end of the plug-in hole.

[0006] On the basis of the above technical solution, preferably, the main tube includes a sleeve, a first connecting ring and a second connecting ring, and the sleeve is arranged between the first connecting ring and the second connecting ring.

[0007] On the basis of the above technical solution, preferably, at least two pressing grooves are provided on the sleeve, and a plurality of the pressing grooves are evenly arranged along the circumference of the main tube.

[0008] On the basis of the above technical solution, preferably, a pressure ring is provided on the sleeve, and the pressure ring is arranged around the main tube.

[0009] Compared with the prior art, the sucker rod coupling of the utility model has the following beneficial effects:

[0010] (1) If the coupling is to achieve its compression and bending resistance, its structure needs to be strong enough to meet the corrosion resistance. Generally, steel or alloy steel is used. However, the cost of steel or alloy steel is relatively high. If an iron body is used with an anti-corrosion coating on its surface, although it can meet the use requirements, when the anti-corrosion coating is damaged or worn, the anti-corrosion ability is lost, and the entire coupling will be corroded immediately, which poses a great safety hazard during use.

[0011] (2) In order to meet the requirements that the coupling can not only resist pressure and bend, but also prevent surface corrosion, and the cutting cost is low, the technical solution uses a body with high pressure resistance and bend resistance, and a sleeve is sleeved on the outside of the body. The sleeve is made of alloy steel or titanium alloy with strong corrosion resistance, so as to meet the requirements of the sucker rod coupling for pressure resistance and bend resistance, and also for corrosion resistance. Since the price of iron is significantly lower than that of alloy steel and titanium alloy, the use of iron in the body can reduce costs;

[0012] (3) One end of the sleeve is bent into one end of the plug-in hole, and the other end of the sleeve is bent into the other end of the plug-in hole. At this time, the sleeve wraps the body more tightly to prevent the body from being corroded; the internal thread of the plug-in hole is used to cooperate with the sucker rod to realize the function of connecting the sucker rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a front view of a sucker rod coupling of the utility model;

[0015] Figure 2 It is a left side view of a sucker rod coupling of the utility model;

[0016] Figure 3 This is a top view of a sucker rod coupling of the utility model;

[0017] Figure 4 For this utility model Figure 1 A cross-sectional view of

[0018] Figure 5 It is a cross-sectional view of the main body of the utility model;

[0019] Figure 6 The utility model is a schematic diagram of another structure of a sucker rod coupling. DETAILED DESCRIPTION

[0020] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-6 As shown, a sucker rod coupling comprises a body 1, on which a plug hole 11 is arranged, and the plug hole 11 is arranged along the length direction of the body 1, and an internal thread is arranged in the plug hole 11, and also comprises a main tube 2, and the main tube 2 is sleeved on the body 1, and one end of the main tube 2 is bent into one end of the plug hole 11, and the other end of the main tube 2 is bent into the other end of the plug hole 11. If the sucker rod coupling is to achieve its compression resistance and bending resistance, its structure needs to be strong enough to meet the corrosion resistance, and steel or alloy steel is generally used, but the cost of steel or alloy steel is relatively high; if an iron body 1 is used and an anti-corrosion coating is applied on its surface, although it can meet the use requirements, when the anti-corrosion coating is damaged or worn, the anti-corrosion ability is lost, and the entire sucker rod coupling will be corroded immediately, and there are great safety hazards during use; in order to meet the sucker rod coupling's ability to resist compression and bending, and to prevent surface corrosion, and to have a low cost, the present technical solution utilizes the present invention with high compression resistance and bending resistance. The main body 1 is a body 1, and a main cylinder 2 is sleeved on the outside of the main body 1. The main cylinder 2 is made of alloy steel or titanium alloy with strong corrosion resistance, which can meet the requirements of the compression and bending resistance of the sucker rod coupling and the corrosion resistance. Since the price of iron is significantly lower than that of alloy steel and titanium alloy, the main body 1 uses iron to reduce costs; one end of the main cylinder 2 is bent into one end of the plug hole 11, and the other end of the main cylinder 2 is bent into the other end of the plug hole 11. At this time, the main cylinder 2 wraps the main body 1 more densely to prevent the main body 1 from being corroded; the internal thread of the plug hole 11 is used to cooperate with the sucker rod to realize the function of connecting the sucker rod.

[0022] The main tube 2 includes a sleeve 21, a first connecting ring 22 and a second connecting ring 23. The sleeve 21 is used to wrap the side of the body 1. The first connecting ring 22 is arranged at one end of the sleeve 21, and the second connecting ring 23 is arranged at the other end of the sleeve 21. The first connecting ring 22 and the second connecting ring 23 are used to protect the end of the body 1, so that the sleeve connection between the body 1 and the main tube 2 is smoother. The opening diameter of the end of the body 1 where the first connecting ring 22 and the second connecting ring 23 are arranged gradually increases, and one end of the first connecting ring 22 and the second connecting ring 23 is sunk into the plug hole 11, so as to improve the corrosion resistance of the body 1.

[0023] At least two pressing grooves 3 are arranged on the sleeve 21, and a plurality of the pressing grooves 3 are evenly arranged along the circumference of the sleeve 21. The pressing grooves 3 are arranged on the sleeve 21, and are used to position the sleeve 21 and the body 1, so as to avoid movement between the sleeve 21 and the body 1 due to thermal expansion and contraction, which affects the use. Secondly, the pressing grooves 3 can also be used to fix and clamp the sucker rod. This embodiment provides two pressing grooves 3, and the two pressing grooves 3 are symmetrically arranged.

[0024] If the relative stability of the position between the main tube 2 and the main body 1 is to be achieved, it is not necessary to use a pressure groove. A pressure ring 31 can also be provided on the sleeve 21. The pressure ring 31 is arranged around the sleeve 21. The pressure ring 31 can also prevent the sleeve 21 and the main body 1 from separating or moving in position under the action of radial force.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sucker rod coupling, comprising a body (1), wherein the body (1) is provided with an inserting hole (11), wherein the inserting hole (11) is arranged along the length direction of the body (1), and an internal thread is arranged in the inserting hole (11), wherein the characteristics are: It also comprises a main tube (2), which is sleeved on the main body (1), one end of the main tube (2) is bent into one end of the plug hole (11), and the other end of the main tube (2) is bent into the other end of the plug hole (11).

2. A sucker rod coupling according to claim 1, characterized in that: The main cylinder (2) comprises a sleeve (21), a first connecting ring (22) and a second connecting ring (23); the sleeve (21) is arranged between the first connecting ring (22) and the second connecting ring (23).

3. A sucker rod coupling according to claim 2, characterized in that: At least two pressing grooves (3) are arranged on the sleeve (21), and a plurality of the pressing grooves (3) are evenly arranged along the circumference of the sleeve (21).

4. A sucker rod coupling according to claim 2, characterized in that: The sleeve (21) is provided with a pressure ring (31), and the pressure ring (31) is arranged around the sleeve (21).

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