CN201963212U - Steel Sucker Rods, Sucker Rod Packs and Pipe Wrench - Google Patents

Abstract

This utility model discloses a steel sucker rod, including a rod head. The wrench face of the rod head includes a cylindrical surface and at least two wrench guards distributed on the cylindrical surface. This utility model also provides a sucker rod assembly using this steel sucker rod and a special pipe wrench for use with the steel sucker rod. In this utility model, the uniform transition of the rod head along its length improves the strength and fatigue resistance of the rod head, and also reduces the resistance to movement when the sucker rod is lifted and lowered in the sucker tube.

Description

Steel Sucker Rods, Sucker Rod Packs and Pipe Wrench

technical field

The utility model relates to a steel sucker rod used in a pumping unit in the field of oil production in an oil field, and a sucker rod group composed of a plurality of sucker rods and couplings. The utility model also relates to a special pipe wrench for disassembling and assembling the steel sucker rod.

Background technique

In the field of oil production, the sucker rod is an important part of the pumping unit.

At present, the structure of the steel sucker rod commonly used on the pumping unit is shown in Figure 1 and Figure 2. The steel sucker rod 10' includes a shaft 11' and a head, and the head is successively formed by a thick flange 12' , wrench square surface 13', external thread shoulder 14' and connecting thread 15'.

The processing process of the steel sucker rod is as follows: First, the rod head is upset first, then the rod head is die-forged to obtain a wrench square surface, and then the connecting thread and other technological structures are obtained by machining.

At present, the cross-sectional shape of the square surface 13' of the wrench and the rough flange 12' and the external thread shoulder 14' have a large degree of concavity and convexity, and there are obvious steps P, which brings difficulty to the die forging process, and the rod head The fatigue strength is also slightly lower. Especially when the sucker rod lifts up and down the oil sucker pipe, the excessive concave-convex transition will cause a certain movement resistance, and then increase the lifting load of the sucker rod.

Utility model content

The purpose of this utility model is to provide a steel sucker rod and a sucker rod group composed of a plurality of sucker rods and couplings, so as to improve the fatigue resistance of the head of the steel sucker rod and reduce the Movement resistance of the sucker rod in the sucker pipe. The utility model also aims to provide a special pipe wrench for disassembling and assembling steel sucker rods.

Therefore, according to an aspect of the present utility model, a steel sucker rod is provided, including a rod head, wherein the wrench surface of the rod head includes a cylindrical surface and at least two wrench ribs distributed on the cylindrical surface.

Further, the above-mentioned at least two spanner ribs are four, which are evenly distributed on the outer circumference of the cylindrical surface.

Further, the above-mentioned at least two spanner ribs are three, which are evenly distributed on the outer circumference of the cylindrical surface.

Further, the above-mentioned rod head sequentially includes a wrench face, an external thread shoulder and a connecting thread.

Further, the above-mentioned rod head sequentially includes a thick flange, a wrench face, an external thread shoulder and a connecting thread.

According to another aspect of the present utility model, there is provided a pipe wrench, the clamping surface of which is adapted to the wrench surface of the steel sucker rod described above, including a first clamping surface covering a cylindrical surface and a receiving At least two grooves for the rib of the wrench.

The utility model also provides a sucker rod group, which includes a plurality of sucker rods and a coupling connecting the heads of two adjacent sucker rods, wherein the plurality of sucker rods include the steel sucker rods described above oil stick.

Further, the outer diameter of the end surface of the coupling is the same as the outer diameter of the external thread shoulder of the rod head.

In the utility model, the square wrench face of the prior art is replaced by a substantially cylindrical wrench face, so that the transition between the wrench face and the shoulder of the external thread is even. In this way, the uniform transition of the rod head in the direction of the rod length not only improves the strength and fatigue resistance of the rod head, but also makes the movement smooth and the resistance of the sucker rod reduced when the sucker rod is lifted up and down in the sucker pipe. Reduce the lifting load and achieve energy saving effect.

In addition to the purposes, features, and advantages described above, other purposes, features, and advantages of the present utility model will be further described in detail with reference to the accompanying drawings.

Description of drawings

The accompanying drawings that constitute a part of this specification and are used for further understanding of the utility model show preferred embodiments of the utility model, and are used together with the description to illustrate the principle of the utility model. In the picture:

Fig. 1 shows the structural representation of the steel sucker rod of prior art;

Fig. 2 shows the A-A sectional schematic view of the steel sucker rod shown in Fig. 1;

Fig. 3 shows the structural representation of the steel sucker rod according to the utility model;

Fig. 4 shows the B-B cross-sectional schematic view of the steel sucker rod shown in Fig. 3;

Fig. 5 shows a schematic structural view of a pipe wrench according to the present invention;

Figure 6 shows a schematic structural view of the sucker rod group according to the present invention; and

Fig. 7 shows a schematic structural view of the clamp of the sucker rod group according to the present invention.

Detailed ways

The embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, but the utility model can be implemented in various ways defined and covered by the claims.

Fig. 3 shows a schematic structural view of a steel sucker rod according to a preferred embodiment of the present invention, and Fig. 4 shows a schematic B-B cross-sectional view of a steel sucker rod according to the present invention. As shown in Figures 3 and 4, the steel sucker rod 10 includes a shaft 11 and a thick rod head, the rod head sequentially includes a wrench face 12, an external thread shoulder 14 and a connecting thread 16, and the wrench face includes a cylindrical surface 12a and the four wrench retaining ribs 12b distributed on the cylindrical surface, the wrench surface of the specific shape of the utility model is referred to as "star surface" hereinafter.

Compared with the steel sucker rod in the prior art, the outer threaded shoulder and connecting thread of the rod head of the utility model do not change, but the wrench surface is improved from a square surface to a star-shaped surface. The function is as follows: the shape between the thick pier flange 18 and the wrench surface tends to be consistent, which can be regarded as omitting the pier thick flange, and the step area between the wrench surface and the shoulder of the external thread due to the difference in shape decreases, In this way, on the one hand, the strength and fatigue resistance of the sucker rod are improved, and on the other hand, the movement resistance of the sucker rod when it moves up and down in the sucker pipe is reduced.

In another embodiment of the steel sucker rod according to the present invention, there are two, three, five or more spanner retaining ribs on the spanner surface, which are evenly distributed on the outer circumference of the cylindrical surface.

Preferably, the cylindrical surface of the wrench face has a circular arc transition with the shoulder of the external thread, and the height of the rib of the wrench is flush with or slightly lower than the surface of the shoulder of the external thread.

In yet another embodiment of the steel sucker rod according to the present invention, the thick pier flange is reserved on the rod head, and the height of the rib of the wrench is flush with or slightly lower than the surface of the thick pier flange.

The manufacturing process of the steel sucker rod according to the utility model is as follows. Firstly, the rod head is thickened, then the wrench face is formed by die forging, and finally other technological structures such as external thread shoulders and connecting threads are obtained by machining.

The steel sucker rod according to the utility model can be loaded and unloaded with the coupling by using the existing pipe wrench, and the special pipe wrench 20 according to the utility model can also be used to load and unload the steel sucker rod.

Fig. 5 shows a schematic structural view of the pipe wrench according to the present invention. As shown in FIG. 5 , the clamping surface of the pipe wrench 20 according to the present invention includes a first clamping surface 22 covering the cylindrical surface of the wrench surface and a groove 24 for accommodating the rib of the wrench. The other structures of the pipe wrench are the same as those of the prior art, and will not be repeated here.

When installing or dismounting the steel sucker rod, make the clamping surface of the pipe wrench grip the wrench surface, and turn the handle of the pipe wrench to realize the installation or disassembly operation of the steel sucker rod.

Using the special pipe wrench of the utility model to install or disassemble the steel sucker rod, the clamping is stable and reliable, and the installation efficiency of the steel sucker rod can be improved.

The steel sucker rod of the utility model is connected together by a coupling (sucker rod coupling) during use to form a sucker rod group with a length of several kilometers. Based on the above-mentioned improvement of the shape of the sucker rod, the movement resistance of the sucker rod group in the sucker pipe is reduced, which helps to reduce the lifting load and achieve energy saving effect.

Fig. 6 shows a schematic diagram of the connection structure of the sucker rod group according to the present invention. As shown in FIG. 6 , the rod heads of two adjacent steel sucker rods are screwed together through a collar 30 .

Fig. 7 shows a schematic structural view of the coupling of the sucker rod group according to the present invention. As shown in Figure 7, the coupling 30 has transition surfaces 32, 34 adjoining the external thread shoulder of the sucker rod head, the outer diameter of the end surface of the coupling is the same as the outer thread shoulder of the rod head. The diameters are the same, that is, the small ends of the transition surfaces 32, 34 are flush with the externally threaded shoulder 14.

By improving the surface shape of the coupling 30, the shape transition between the sucker rod and the coupling is uniform, which can further reduce the lifting resistance of the sucker rod group when the sucker pipe moves up and down, and achieve energy saving effect.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Explanation of reference signs

10 steel sucker rod 11 shaft

12 wrench face 14 threaded shoulder

16 connection thread 18 pier thick flange

12a Cylindrical surface 12b Wrench rib

20 pipe wrench 22 first clamping surface

24 grooves 30 couplings

32, 34 Transition surfaces.

Claims (8)

1. A steel sucker rod, comprising a rod head, characterized in that the wrench surface of the rod head includes a cylindrical surface and at least two wrench ribs distributed on the cylindrical surface. 2. The steel sucker rod according to claim 1, characterized in that the at least two spanner retaining ribs are four, which are evenly distributed on the outer circumference of the cylindrical surface. 3. The steel sucker rod according to claim 1, characterized in that the at least two spanner retaining ribs are three, and are evenly distributed on the outer periphery of the cylindrical surface. 4. The steel sucker rod according to claim 1, characterized in that, the rod head comprises the wrench face, the external thread shoulder and the connecting thread in sequence. 5. The steel sucker rod according to claim 1, characterized in that, the rod head sequentially comprises a pier flange, the wrench face, an external threaded shoulder and a connecting thread. 6. A pipe wrench, characterized in that its clamping surface is adapted to the wrench surface of the steel sucker rod according to any one of claims 1 to 5, and includes a first A gripping surface and at least two grooves accommodating said wrench ribs. 7. A sucker rod group, comprising a plurality of sucker rods and a coupling connecting the rod heads of two adjacent sucker rods, characterized in that, the plurality of sucker rods include any of the sucker rods according to claims 1-5 One of the described steel sucker rods. 8. The sucker rod set according to claim 7, wherein the outer diameter of the end face of the coupling is the same as the outer diameter of the external thread shoulder of the rod head.

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