Hollow sucker rod

Abstract

The invention relates to the technical field of oil production engineering machinery in oil fields, in particular to a hollow sucker rod. The technical proposal is that the hollow sucker rod comprises a hollow joint and a rod body, wherein the rod body is provided with a hollow cavity and is fixedly connected with one end of the hollow joint, a centralizer is arranged on the rod body, and the outside diameter of the centralizer is larger than that of the rod body and the hollow joint. As an improvement, the centralizer is a carbon fiber centralizer. As a further improvement, the other end of the hollow joint is provided with a threaded connecting part which is provided with a thrust bearing surface and a sealing device. The hollow sucker rod has reasonable structure and reliable sealing, not only can play good centralizing effect, but also has high precision, reduces eccentric wears during oil pumping, reduces the machine halt frequency caused by the eccentric wear, greatly improves the service life of the hollow sucker rod, prolongs the working cycle, and reduces the oil production cost.

Description

1. Technical field: [0001] The invention relates to the technical field of oil field production engineering machinery, in particular to a hollow sucker rod. 2. Background technology: [0002] At present, with the continuous development of my country's petroleum industry, heavy oil, high wax and other difficult-to-recover reserves are continuously exploited, and the production of heavy oil, high wax and other difficult-to-recover reserves requires the use of hollow sucker rods in technology. The traditional ordinary hollow sucker rod is a new type of oil production equipment used for the exploitation of high-viscosity and high-condensation crude oil in oil fields. It injects heat carriers (hot oil, hot water, hot gas), chemical agents Or run into the cable for heating to achieve viscosity reduction and wax melting, thereby improving the fluidity of crude oil and improving the recovery efficiency of "three high" crude oil. It can also be used for water injection, wax removal, ...

AI Technical Summary

Problems solved by technology

[0003] However, since the hollow sucker rod continuously moves up and down in the oil well and passes through the pump to send the crude oil in the well to the ground, as the difficulty of mining increases, the extraction of high-condensation oil and heavy oil requires electric heating. Therefore, some oil wells need to use hollow sucker rods and insert thermal cables in the hollow sucker rods, and then extract oil from horizontal oil wells. When it is at the kickoff point in the well, when the sucker rods move on the inner wall of the tubing, the friction will damage and break the sucker rod, and the cable in the pipe will burn out. Moreover, the water content of the current oil well will increase, and the eccentric wear of the pipe and rod will increase. Affect oil well production

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