Rapid slip-casting capsule type plugging technology for oil transmission pipeline

Abstract

The invention discloses a rapid slip-casting capsule type plugging technology for an oil transmission pipeline. The technology comprises the following concrete steps of shutting down and depressurizing the pipeline; manufacturing an operating pit; welding and manufacturing a trepanned short section; installing a trepanning machine; trepanning; assembling a slip-casting plugging device; replacing the slip-casting plugging device; debugging the slip-casting plugging device, and ensuring the normal operation; sending a capsule, and blending a slurry; slip casting: starting a slip-casting pump, pressing and injecting the slurry in a slurry tank into a slip-casting capsule through a capsule sending slip-casting rod, and stopping pressing and injecting the slurry after the diameter of the slip-casting capsule is fully filled in the whole pipeline to be repaired and rescued; disassembling the slip-casting plugging device; disconnecting the capsule sending slip-casting rod, and closing a checkvalve, so that the slurry in the slip-casting capsule is prevented from overflowing in the reverse direction; pulling out the capsule sending slip-casting rod, returning to the upper part of a sandwich valve, closing the sandwich valve, and disassembling and cleaning the slip-casting plugging device; and finishing plugging after the slurry is solidified.

Description

technical field [0001] The invention relates to a rapid grouting bladder plugging process for oil pipelines, which is applied to the technical field of emergency repair of oil pipelines. Background technique [0002] At present, the commonly used plugging technologies for oil pipelines include plug plugging (disc type), baffle-bladder plugging, etc. [0003] (1) The principle of plug type plugging (disc type) is to weld equal-diameter plugging tee on the pipeline, then open a hole with the same or similar inner diameter as the pipeline, and then use the main shaft of the plug to send the hanging plugging head into the pipeline The advantage of this method is that it can block high-pressure media. At present, the highest domestic plugging pressure is 10MPa. In this way, the opening size is large, and the opening and welding time is long; there are too many accessories for the blocking equipment, which requires opening headers, blocking cylinders, blocking headers, hydraulic ...

AI Technical Summary

Problems solved by technology

[0005] Both of the above two methods have the characteristics of complicated installation, long operation time, and high requirements on the site. For emergency repair of pipelines, they cannot meet the requirements of rapid and safe sealing of leaking pipelines under harsh site conditions to avoid large-scale leakage of crude oil. requirements

Images