Carbon fiber sucker rod coupling

Abstract

The invention belongs to the field of oil extraction equipment, and particularly relates to a carbon fiber sucker rod coupling. The carbon fiber sucker rod coupling comprises a coupling body, whereininternal threads used for being connected with a sucker rod are machined at the two ends of the inner side of the coupling body, anti-unscrewing devices are arranged in the part, on the inner sides ofthe internal threads, of the coupling body, each anti-unscrewing device comprises a ratchet wheel sleeve, a pawl and a pawl seat, the ratchet wheel sleeves are fixedly connected with the coupling body through screws, ratchets are machined in the ratchet wheel sleeves, and the pawl seats are connected with the sucker rod in an inserted mode so that the ratchet wheel sleeves and the sucker rod cantransmit rotary motion, the pawls are pivoted to the pawl seats, torsion springs are arranged at the pivoted positions, the free ends of the pawls tend to expand outwards under the torsion action of the torsion springs, and when the pawls abut against ratchets on the inner sides of the ratchet wheel sleeves, the pawls can only rotate in one direction relative to the ratchet wheel sleeves. According to the carbon fiber sucker rod coupling, the problem that the sucker rod and the sucker rod coupling are loosened is solved, production accidents caused by loosening in the reciprocating motion process of the sucker rod string are avoided, and the sucker rod coupling is easy to mount and dismount and can be repeatedly used.

Description

technical field [0001] The invention belongs to the field of oil production equipment, in particular to a carbon fiber sucker rod coupling. Background technique [0002] The sucker rod is a slender rod made of high-strength alloy steel. The two ends of the sucker rod are externally threaded joints. Multiple sucker rods are connected through the sucker rod coupling, and the downhole pumping rod is driven by the sucker rod. The piston of the oil pump reciprocates up and down to pump the oil in the formation to the ground. Since the diameter of the sucker rod coupling is larger than that of the sucker rod, the sucker rod coupling will inevitably rub and collide with the inner wall of the oil pipe, which will easily cause oil pumping. In order to reduce the wear of the rod coupling and the inner wall of the oil pipe, various types of carbon fiber sucker rod couplings are disclosed in the prior art, all of which have a good anti-wear effect and basically solve the above-mentioned...

AI Technical Summary

Problems solved by technology

[0002] The sucker rod is a slender rod made of high-strength alloy steel. The two ends of the sucker rod are externally threaded joints. Multiple sucker rods are connected through the sucker rod coupling, and the downhole pumping rod is driven by the sucker rod. The piston of the oil pump reciprocates up and down to pump the oil in the formation to the ground. Since the diameter of the sucker rod coupling is larger than that of the sucker rod, the sucker rod coupling will inevitably rub and collide with the inner wall of the oil pipe, which will easily cause oil pumping. In order to reduce the wear of the rod coupling and the inner wall of the oil pipe, various types of carbon fiber sucker rod couplings are disclosed in the prior art, all of which have a good anti-wear effect and basically solve the above problems

[0003] However, the problem still exists in the carbon fiber sucker rod coupling in the prior art is that the reciprocating sucker rod will generate torsion force during actual operation, resulting in a breakout torque between the sucker rod and the sucker rod coupling, and the unloading The fastening torque will cause the sucker rod and the sucker rod coupling to loosen or even fall off, making the connection invalid and causing major production accidents

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