Expanding and blocking preventing device used for radial hole forming of pipeline and expanding and blocking preventing method

Abstract

The invention discloses an expanding and blocking preventing device used for radial hole forming of a pipeline, and belongs to the technical field of oil and gas storage and transportation safe operation. The expanding and blocking preventing device comprises parallel reinforcing ribs, a parallel double-arch rib plate, an inclined rib plate and a center positioning plate, and is characterized in that the parallel reinforcing ribs are composed of two parallel edges; the center positioning plate is round inside and square outside; the two ends of the center positioning plate and the two edges of the parallel reinforcing ribs are fixed; the parallel double-arch rib plate comprises two side faces of the same structure; the lower portions of the side faces are each of an arch-shaped structure; the radian of each arch-shaped structure is consistent with the radian of the outer diameter of the pipeline where a hole is about to be formed; the upper portions of the two side faces and the two edges of the parallel reinforcing ribs are fixed respectively; and the lower plane of the center positioning plate is tangent to the arc tops of the arch-shaped structures. The expanding and blocking preventing device is used in radial hole forming operation of the oil and gas pipeline under pressure; due to the fact that the expanding and blocking preventing device is pre-welded before hole forming, the problem that a saddle-shaped arc plate is deformed because of internal stress release in the hole forming cutting and separating process, and consequently a cylindrical cutter is expanded and blocked is solved; and the hole forming success rate is increased.

Description

technical field [0001] The invention belongs to the technical field of safe operation of oil and gas storage and transportation, and in particular relates to a circumferential anti-expansion jamming device and an anti-expansion jamming method for a tool when a pipeline is opened under pressure. Background technique [0002] At present, during the reconstruction and repair process of oil and gas pipelines, oil and gas pipeline drilling operations are often carried out according to GB / T28055-2011 "Technical Specifications for Hot Sealing of Steel Pipelines". Under the condition of pressure, the undercut cylindrical cutter is used for radial cutting perpendicular to the pipe and rotating feed. Due to the long-term pressurized operation of the pipeline, a large internal stress is generated inside the material, which is equivalent to applying prestress to the pipeline. When the cylindrical tool cuts, the saddle-shaped arc plate gradually separates from the pipeline as a whole. S...

AI Technical Summary

Problems solved by technology

[0003] The invention provides an anti-expansion clamping device for the radial opening of pipelines. In order to solve the problem of the cylindrical tool being expanded and clamped, the invention takes reducing the expansion deformation of the saddle-shaped arc plate as the entry point, and designs a device that can be pre-installed. The anti-expansion clamping device welded on the pipe can lock the deformation of the saddle-shaped arc plate before opening the hole, and minimize the expansion and jamming of the cylindrical tool by the separated saddle-shaped arc plate when opening the hole pressure to achieve normal drilling operations

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