Trepanning pup joint for oil-gas pipeline

Abstract

The invention discloses a trepanning pup joint for an oil-gas pipeline, and belongs to the technical field of oil-gas pipeline construction. The trepanning pup joint for the oil-gas pipeline comprisesan external flange and a reinforcing plate; the external flange comprises a flange plate and a coiled tube, wherein the first end of the coiled tube is arranged in the flange plate in a sleeved modeand fixedly connected with the flange plate; the second end of the coiled tube can be arranged in the reinforcing plate in a sleeved mode; and the annular face of the reinforcing plate can be attachedto the outer wall of the oil-gas pipeline. Through the trepanning pup joint, the welding workload during welding is decreased by adopting the reinforcing plate, so that overall operation is easy, convenient and easy to do; meanwhile, the welding amount is also decreased, and the possibility of stress concentration of the oil-gas pipeline is decreased; meanwhile, the reinforcing plate, the coiledtube and the oil-gas pipeline are welded into a whole, and thus an annular space is not formed between the reinforcing plate and the oil-gas pipeline any more; and therefore, after the oil-gas pipeline is trepanned, fluid in the oil-gas pipeline does not make contact with the reinforcing plate, the sealing failure of the reinforcing plate is avoided, and use safety is ensured.

Description

technical field [0001] The invention relates to the technical field of oilfield pipeline construction, in particular to an oil and gas pipeline opening pup joint. Background technique [0002] With the development of the national economy, the demand for energy such as oil and natural gas has exploded, and more and more main oil and gas pipelines in operation need to lead out smaller-caliber branch pipelines for new customer demand. When connecting the branch pipes, in order not to affect the conveying efficiency, the non-stop conveying with pressure drilling operation becomes the preferred solution. In order to ensure the smooth implementation of the non-stop and pressure drilling operation, it is necessary to weld the drilling sub-joint on the oil and gas pipeline. [0003] In the prior art, an all-inclusive open hole pup joint is provided, including: an upper guard plate and a lower guard plate that can be closed into a hollow cylindrical shape, and a flange tube welded t...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the defects of large volume and heavy welding workload and difficulty in welding of the open pup joint in the prior art, and the corrosion of the guard plate is easy to occur, the embodiment of the present invention provides an open pup joint for oil and gas pipelines. The technical plan is as follows:

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