Novel connection structure for oil well pipes and couplings

Abstract

The invention discloses a novel connection structure for oil well pipes and couplings. The structure comprises a plurality of oil well pipes. The ends of any two adjacent oil well pipes are connectedby a coupling; the end of each of the oil well pipes includes a hollow oil well pipe end body (1). The outer wall of the rear end of each oil well pipe end body (1) is provided with a plurality of external threads (2). The front end of each oil well pipe end body (1) is provided with a guiding column (5); each coupling includes a hollow coupling body (8), and the front inner walls of the left andright sides of the coupling bodies (8) are symmetrically provided with a plurality of internal threads (9). The inner walls of the coupling bodies (8) at the rear ends of the internal threads (9) areprovided with guiding sleeves (11); the external threads (2) and the internal threads (9) are meshed with each other, and the guide columns (5) are inserted into the guide sleeves (11). The structurecan ensure a reliable sealing connection between the coupling and the end of the oil well pipe with strong sealing property, and can effectively avoid leakage of oil or natural gas.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a novel connection structure between an oil well pipe and a collar. Background technique [0002] At present, when oil and gas are exploited in oil and gas wells, oil well pipes are usually used, and dozens or even hundreds of oil well pipes need to be connected together for the transmission of oil or natural gas. [0003] In order to connect two adjacent oil well pipes, the usual method is: threaded connection through a coupling, and the left and right ends of the oil well pipe are tapered cylinders with external threads, and the coupling is a symmetrical inner The inner taper and outer cylinder of the thread form a pipe joint through the tightening of the inner thread and the outer thread to realize the connection of two oil well pipes, and the tapered inner thread and outer thread play a sealing role , which is also a traditional American Petroleum Institute API standard ...

AI Technical Summary

Problems solved by technology

[0004] For oil and gas wells, it is usually necessary to twist dozens or even hundreds of oil well pipes together through couplings to form pipe strings. However, for existing oil well pipes and matching That is, loading and unloading), then the threaded connection between the coupling and the end of the oil well pipe will be prone to problems such as excessive wear, bonding, or insufficient strength, which will reduce the sealing performance of the threaded connection between the coupling and the end of the oil well pipe. The coupling cannot be fully tightened and connected to the end of the oil well pipe. In severe cases, it may even cause the oil well pipe to fall off from the pipe string, and cause oil or natural gas to leak from the threaded connection between the coupling and the end of the oil well pipe. serious safety hazard

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