Flexible composite pipe interlayer gas exhaust device for gathering and transportation of acid natural gas and installation method of flexible composite pipe interlayer gas exhaust device

Abstract

The invention discloses a flexible composite pipe interlayer gas exhaust device for gathering and transportation of acid natural gas, which comprises a flat-head core pipe and an external thread core pipe, the external thread core pipe is connected with the flat-head core pipe through a nut, the external thread core pipe and the flat-head core pipe are respectively provided with a joint sleeve, a plurality of exhaust through holes are formed in the side wall of the connector sleeve, and a detachable exhaust valve connecting sleeve is arranged on the side wall of the connector sleeve. Due to the fact that an exhaust pipeline is additionally arranged, interlayer gas is led out through an exhaust valve to be treated in a centralized mode, and the hidden danger of environmental protection when the interlayer gas is exhausted into soil or air originally is overcome. The flexible composite pipe interlayer gas exhaust device has the advantages of being reasonable in structural design, stable in quality, reliable and practical, the requirement for exhausting the interlayer gas of a flexible composite pipe for gathering and transportation of the acid natural gas can be completely met, and when transportation is stopped, the conditions that the gas pressure in the interlayer is larger than the external pressure capacity of a lining layer to cause collapse and failure, and the acid natural gas contains H2S and other toxic gas, resulting exhaust environmental protection hidden danger risks are avoided.

Description

technical field [0001] The invention relates to a natural gas transportation device, more precisely, an interlayer gas exhaust device of a flexible composite pipe for sour natural gas gathering and transportation. Background technique [0002] Flexible composite high-pressure delivery pipe (hereinafter referred to as flexible composite pipe) has corrosion resistance, high pressure resistance, swelling resistance, good flexibility, long single pipe, less pipe fittings, simple construction, long life and good economy, and has been widely used in oil and gas fields . [0003] The flexible composite pipe adopts a multi-layer composite structure, including inner lining layer, reinforcement layer and outer protective layer. The inner lining layer is made of polymer resin material, which has gas permeability due to its own molecular structure characteristics. When transporting sour natural gas, if the transport medium contains more small molecule gases such as CH4, CO2 and H2S, sm...

AI Technical Summary

Problems solved by technology

Even so, it cannot ensure that the exhaust valve is vertically upward, and if the exhaust valve is not installed vertically upward, it is easy to cause the exhaust valve spool to be stuck, and it cannot be exhausted or closed normally.

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