Arc sealing device for pipeline or drill pipe hole forming under pressure and using method

Abstract

The invention relates to an arc sealing device for pipeline or drill pipe hole forming under pressure and a using method and belongs to the technical field of hydraulic and pressurized sealing. An antiskid hoop and a sealing hoop are provided with arc grooves, a circular-arc-shaped sealing groove is formed in the arc groove of the sealing hoop, and an arc sealing ring is arranged in the circular-arc-shaped sealing groove. The sealing hoop is provided with a drilling channel communicated with a hole forming device. The hoops hold a drill pipe through hexagon bolts and hexagon nuts. A balance dual type structure is adopted in one face of the arc sealing ring, and an arc groove is formed in the outer face of the arc sealing ring. Two grease filling channels connected with the rear end of the sealing groove are arranged in the sealing hoop with the drilling channel, and grease filling check valves are arranged at inlets of the grease filling channels. The sealing hoop with the drilling channel is provided with two pressure testing channels connected with the drilling channel, and pressure testing check valves are arranged at inlets of the pressure testing channels. A pressure testing end cap and a pressure relieving screw are arranged at the right end of the sealing hoop with the drilling channel.

Description

technical field [0001] The invention relates to an arc-shaped sealing device used for opening a pressurized pipeline or a drill pipe and a using method thereof, and belongs to the technical field of hydraulic pressure and air pressure sealing. Background technique [0002] In the process of oil and gas pipeline transportation, when the pipeline is damaged during operation or a branch is to be added to the existing pipeline, the traditional method is to stop the pipeline, decompress, release, purge, etc., and then carry out construction. This construction method requires a long time of pipeline stoppage, many links involved, high labor intensity, poor safety, serious pollution and large production loss. Especially when transporting heavy oil and other easily condensable crude oil on the main line, often due to the long stoppage time, the pipeline is blocked and the additional workload is increased, and the entire pipeline will be scrapped if it is serious. In order to solve ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the potential safety hazards caused by welding pipeline sealing in the existing sealing technology for pipeline or drill pipe opening, and the problems of low pressure, large deformation, short life and liquid leakage of plane balanced double seal, the invention provides a Arc-shaped sealing device for opening holes in pressurized pipelines or drill pipes and its application method

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