Large-aperture compressed natural gas storage well and installation method thereof

Abstract

The invention discloses a large-aperture compressed natural gas storage well and an installation method thereof, which belong to the technical field of compressed natural gas storage equipment. The gas storage well comprises a well fixing cast pipe (1), a well fixing cement layer (2), a dry pipeline (3), a dry pipeline valve (4), a gas inlet and outlet pipeline valve (5), a pressure meter (6), a safety valve (7), a main control valve (8), a pollution discharge pipeline (9), a pollution discharge pipeline (10), a gas storage cylinder (11) and a fixed position (12), wherein the lower end of thegas storage cylinder (11) is arranged on a bottom support flange; the upper part of the gas storage cylinder (11) is fixed on a gas storage cylinder opening sealing flange through a flange and a pin;and an enclosed structure is formed by the well fixing cast pipe (1) and a gas storage cylinder opening flange. The well has the advantages of high safety performance and low operation cost and makesthe installation, the maintenance and the inspection of a gas storage device convenient.

Description

technical field [0001] The invention belongs to the technical field of compressed natural gas (CNG) gas storage equipment, and in particular provides a compressed natural gas storage well and an installation method thereof. Provide a gas storage device and gas storage method with high safety performance, easy installation, maintenance, inspection, and low operating cost for the storage of CNG in natural gas filling stations. The invention has the advantages of adopting an integral bottle-type gas storage device, simple structure, high reliability, low leakage rate, convenient maintenance, cost reduction of about 30% compared with traditional gas storage wells, and significant economic benefits. Background technique [0002] Under the traditional gas storage well technology conditions, a natural gas filling station is equipped with 4 to 6 gas storage wells for storing CNG with a pressure of 25MPa. Gas storage wells usually use seamless steel pipes with an outer diameter of 1...

AI Technical Summary

Problems solved by technology

[0005] (1) Poor safety performance: In conventional wells, the seamless steel pipes are fixed together by the tie, and the outer wall is fixed underground with cement, which lacks protection against lateral impact and is subject to complex forces, which leads to easy fracture of the gas storage pipe or the tie. The gas well was completely scrapped, and even caused major accidents such as gas storage well explosion

[0006] (2) The gas storage cylinder is easy to string up: due to poor cementing quality, some gas storage wells will slowly climb up or sink during use, and even continue to climb or sink after one treatment The phenomenon

[0008] (4) Periodic inspection and maintenance cannot be effectively implemented: the construction personnel can only carry out effective maintenance work on the wellhead part, and for the underground part, because of the sealing operation, the outer surface of the steel pipe cannot be repaired smoothly, and the inner surface is made of oil well. Inspection and maintenance of flaw detection equipment, there are problems in detection accuracy and reliability

In this way, there is a great potential safety hazard in this structural form.

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