Composite pipeline hot tapping plugging method

Abstract

The invention discloses a composite pipeline hot tapping plugging method which comprises the following steps: firstly carrying out hot tapping on a steel lining composite pipe by adopting tapping equipment, wherein a cut-off saddle-shaped piece is taken out by a center drill; measuring the external diameter of the saddle-shaped piece and the diameter of an open pore in the steel lining composite pipe, and making a sealing ring according to the size different for later use; chamfering the acute angle of a cutting surface of the saddle-shaped piece into an obtuse angle, smearing adhesive to the surface of the saddle-shaped piece, and arranging the sealing ring on the cutting surface to form a plug used for the open pore; after other construction operations are completed, sending the plug to the home position of the open pore in the composite pipe by adopting a mechanical method, and fixing with a three-way snap ring, thus completing plugging of the open pore of the composite pipe. The method has the advantages that the sealing method is simple, the sealing effect is good, plugging sealing of the open pore is performed by adopting a method of using the saddle-shaped piece cut off by tapping and the sealing ring, and the material cost is low, thus well solving the difficulty of sealing of an adhered part of a steel pipe and an inner lining pipe at the pipe wall of the open pore after plugging construction of the steel lining composite pipe is completed.

Description

technical field [0001] The invention relates to the pressure drilling operation of pipelines, in particular to a pressure drilling and sealing method for steel-lined composite pipelines. Background technique [0002] Transmission pipelines in oil, natural gas, and chemical industries often require construction operations such as line changes, valve replacements, and dangerous leakage repairs without the medium being transmitted. figure 1 shown. Some pipeline rerouting distances are only a few meters, and some can reach tens of kilometers. For example, the opening and sealing procedure for a section of pipeline to be repaired is as follows: first, weld the package bypass tee and the plugging tee at both ends of the main pipeline to be repaired. Open the bypass tee with pressure and connect the temporary bypass; open the plugging hole with pressure on the plugging tee, and use a sealing machine to seal; after both ends are sealed, remove the old pipe and replace it with a new...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above-mentioned defects in the prior art, and to provide a method for sealing composite pipes with pressurized holes, so as to solve the problem of bonding between the steel pipe and the lining pipe at the wall of the hole after the construction of the steel-lined composite pipe. sealing problem

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