CN208564454U - A kind of cladding sucker rod - Google Patents

Abstract

A coated sucker rod, the rod body is coated with an anti-corrosion pipe, the head of the rod body has external threads, the diameter of the inner hole of the lower part of the push-bearing joint is equal to the diameter of the head of the rod body, the upper part of the push-bearing joint has internal threads, and the push-bearing joint has internal threads. The inner thread of the upper part of the bearing joint matches the outer thread of the head of the rod body, the bearing joint is sleeved from the head of the rod body, the lower part of the bearing joint reaches the upper part of the anti-corrosion pipe, and the inner thread of the upper part of the bearing joint matches the outer thread of the head of the rod body. Threaded connection, so that the push-bearing joint forms a push-bearing surface on the head of the rod body, and the lower part of the push-bearing joint is squeezed, so that the lower part of the push-bearing joint is deformed and reduced in diameter and then pressed on the anti-wear tube, and the extrusion force is transmitted to the rod body. There is no gap between the upper part of the anti-corrosion pipe and the rod body, and the well fluid cannot penetrate into the gap between the rod body and the anti-corrosion pipe, so as to prevent the rod body from being corroded by the well fluid, the processing is simple, the cost is low, and the reliability of preventing the rod body from being corroded is high. It can prolong the service life of the sucker rod string, reduce the workover operation of the oil well, and improve the economic benefit of the oil well.

Description

A coated sucker rod

technical field

The utility model belongs to a sucker rod used for connecting an oil sucking pump and an oil pumping unit in an oil field oil well, which is a coated sucker rod.

Background technique

In the oil field pumping system, the sucker rod is immersed in the well fluid to work, and the well fluid contains corrosive medium, which corrodes the sucker rod, resulting in a short service life of the sucker rod string, a short production cycle of the oil well, and poor economic benefits. . In order to solve this problem, material-type anti-corrosion sucker rods have been used in the oil field, but this kind of sucker rod is made of metal material with limited corrosion resistance and cannot completely solve the problem of corrosion. Chinese patent 200620086330.8 "Anti-eccentric wear sucker rod", the technical solution involved in this patent is in actual use, it is found that well fluid will enter the anti-wear pipe, so that the sucker rod will be corroded by the well fluid, which will cause long-term corrosion. The sucker rod is damaged, and the sucker rod breakage accident is prone to occur. To this end, the technicians also designed the Chinese patent 2012203275962 "a new type of anti-eccentric wear sucker rod". This kind of sucker rod should be treated with QPQ salt bath on the surface layer of the sucker rod (1) to form a QPQ salt bath layer ( 4), the well fluid will enter the anti-wear pipe and the sucker rod will not be corroded, but the processing is complicated. It will greatly increase the production cost of the sucker rod.

SUMMARY OF THE INVENTION

The purpose of the utility model is to design a coated sucker rod, so that the sucker rod is not corroded, and the service life of the sucker rod string is improved.

The purpose of the utility model is achieved in this way: including a push-bearing joint, an anti-corrosion pipe, and a rod body, the rod body is covered with an anti-corrosion pipe, the head of the rod body has an external thread, and the diameter of the lower inner hole of the push-bearing joint is equal to the head of the rod body. Diameter, there is an inner thread on the upper part of the push bearing joint, the inner thread on the upper part of the push bearing joint matches the external thread of the head of the rod body, the push bearing joint is sleeved from the head of the rod body, and the lower part of the push bearing joint reaches the upper part of the anti-corrosion pipe, push the The inner thread of the upper part of the bearing joint is connected with the outer thread of the head of the rod body, so that the bearing joint forms a bearing surface on the head of the rod body, and the lower part of the bearing joint is squeezed, so that the inner hole of the lower part of the bearing joint is deformed and reduced in diameter. It is tightly pressed on the anti-wear pipe, and the extrusion force is transmitted to the rod body, so that there is no gap between the upper part of the anti-corrosion pipe and the rod body, and the well fluid cannot penetrate into the gap between the rod body and the anti-corrosion pipe to prevent the rod body from being corroded by the well fluid.

The beneficial effect of the utility model is: when the head of the rod body forms a bearing surface, there is no gap between the upper part of the anti-corrosion pipe and the rod body, and the well fluid cannot penetrate into the gap between the rod body and the anti-corrosion pipe, preventing the rod body from being damaged. Well fluid corrosion. Compared with the prior art, the utility model has the advantages of simple processing, low cost, high reliability in preventing the rod body from being corroded, and can prolong the service life of the sucker rod string, prolong the production cycle of the oil well, reduce the workover operation of the oil well, and improve the performance of the oil well. economic benefits.

Description of drawings

Fig. 1 is the assembly drawing of the present utility model.

FIG. 2 is a structural diagram of the piece 1 in FIG. 1 when it is not extruded.

Detailed ways

Embodiments of the present utility model will be described below with reference to FIGS. 1 and 2 .

As can be seen from the figure, the embodiment of the present invention includes a push-bearing joint 1, an anti-corrosion pipe 2, and a rod body 3. The rod body 3 is covered with an anti-corrosion pipe 2. The head of the rod body 3 has an external thread 4, and the lower part of the push-bearing joint 1 is inside The diameter of the hole 7 is equal to the diameter of the head of the rod body 3, the upper part of the push-bearing joint 1 has an inner thread 6, the inner thread 6 of the upper part of the push-bearing joint 1 is matched with the outer thread 4 of the head of the rod body 3, and the push-bearing joint 1 starts from the rod body 3. The lower part of the push-bearing joint 1 reaches the upper part of the anti-corrosion pipe 2, and the inner thread 6 of the upper part of the push-bearing joint 1 is connected with the outer thread 4 of the head of the rod body 3, so that the push-bearing joint 1 is in the head of the rod body 3. The thrust bearing surface 5 is formed, and the lower part of the thrust bearing joint 1 is squeezed, so that the lower inner hole 7 of the thrust bearing joint 1 is deformed and reduced in diameter and then pressed on the anti-wear tube 2, and the extrusion force is transmitted to the rod body 3 to prevent corrosion. There is no gap between the upper part of the pipe 2 and the rod body 3, and the well fluid cannot penetrate into the gap between the rod body 3 and the anti-corrosion pipe 2, so as to prevent the rod body 3 from being corroded by the well fluid. There are bosses 8 on the inner wall of the lower inner hole 7 of the push bearing joint 1. There are several bosses 8, which can be pressed into the surface of the anti-corrosion pipe 2 to increase the bonding force between them and prevent the anti-corrosion pipe 2 from stretching.

Both ends of the sucker rod of the utility model have the same structure.

The function of the thrust bearing surface 5 is to connect with the sucker rod coupling to lock when going down the well, so as to prevent the sucker rod coupling from falling off and falling into the well.

Claims (2)

1. A coated sucker rod, comprising a push joint (1), an anti-corrosion pipe (2), a rod body (3), the rod body (3) is coated with the anti-corrosion pipe (2), and the head of the rod body (3) There is an external thread (4), which is characterized in that the diameter of the lower inner hole (7) of the thrust bearing joint (1) is equal to the diameter of the head of the rod body (3), and the upper part of the thrust bearing joint (1) has an internal thread (6) , the inner thread (6) of the upper part of the push bearing joint (1) is matched with the outer thread (4) of the head of the rod body (3), the push bearing joint (1) is inserted from the head of the rod body (3), and the push bearing joint ( The lower part of 1) reaches the upper part of the anti-corrosion pipe (2), and the inner thread (6) of the upper part of the push-bearing joint (1) is connected with the outer thread (4) of the head of the rod body (3), so that the push-bearing joint (1) is in the rod body. The head of (3) forms a thrust bearing surface (5), which squeezes the lower part of the thrust bearing joint (1), so that the lower inner hole (7) of the thrust bearing joint (1) is deformed and reduced in diameter and then tightly pressed against the anti-wear tube. (2), the extrusion force is transmitted to the rod body (3), so that there is no gap between the upper part of the anti-corrosion pipe (2) and the rod body (3), and the well fluid cannot penetrate between the rod body (3) and the anti-corrosion pipe (2). In the gap between the rods to prevent the rod body (3) from being corroded by the well fluid. 2 . The coated sucker rod according to claim 1 , wherein a boss ( 8 ) is provided on the inner wall of the lower inner hole ( 7 ) of the thrust bearing joint ( 1 ). 3 .