Multilayer fuel gas storage well cylinder used for high-pressure underground fuel gas storage well and molding-fixing method thereof

Abstract

The invention belongs to a multilayer fuel gas storage well cylinder used for a high-pressure underground fuel gas storage well and a molding-fixing method of the multilayer fuel gas storage well cylinder. The fuel gas storage well cylinder comprises an inner-layer fuel gas storage cylinder, a cement protecting-reinforcing layer and an outer cylinder. The molding-fixing method comprises the following steps: drilling a foundation well and lowering the outer cylinder, fixing the outer cylinder, lowering the fuel gas storage cylinder, pouring the cement protecting-reinforcing layer and molding and fixing the multilayer fuel gas storage well cylinder. In the invention, the cement protecting-reinforcing layer which tightly wraps the outer surface of the fuel gas storage cylinder and fastens the fuel gas storage cylinder and the outer cylinder integrally is additionally arranged on the basis of a traditional double-tube underground fuel gas storage well, so that the multilayer fuel gas storage well cylinder has the advantages that in the using process, the corrosion of the fuel gas storage cylinder caused by the underground water can be isolated completely, the well fixing effect is improved effectively, the deformation amplitude of the fuel gas storage cylinder caused by alternating load is reduced greatly, the safety and reliability of the fuel gas storage and the running of the underground fuel gas storage well is ensured, not only the service life of the fuel gas storage well can is prolonged, but also the breakage or explosion in the using process of the shaft of the fuel gas storage well is prevented, and the like.

Description

technical field [0001] The invention belongs to a multi-layer gas storage well body for underground gas storage wells of high-pressure fuel gas and a method for forming and fixing the well body, in particular to a multi-layer gas storage well casing containing a gas storage casing layer, a cement protection strengthening layer and an outer casing protection and fixing layer for use in A shaft body for underground gas storage, and a method for forming and fixing the shaft body; adopting the multi-layer gas storage well shaft body for a high-pressure fuel gas underground gas storage well of the present invention to store high-pressure fuel gas can ensure that the outer surface of the gas storage layer is covered by cement and the outer cylinder body Evenly coated and fastened into one body, it can effectively prevent the gas storage cylinder from being corroded by groundwater and harmful gases while enhancing the strength of the gas storage cylinder, ensuring long-term safe and r...

AI Technical Summary

Problems solved by technology

[0004] The solution to the multi-layer gas storage well body of the present invention is to aim at the disadvantages existing in the use process of the double-pipe underground natural gas high-pressure gas storage well. The layer not only tightly wraps the outer surface of the gas storage cylinder and tightly connects the inner layer of gas storage cylinder with the outer cylinder, but also strengthens the inner layer of gas storage cylinder to reduce the impact of alternating load on the gas storage cylinder during use. Adverse effects; in addition, since the inner gas storage tank, the cement protection reinforcement layer and the outer cylinder are fastened together, there is no cavity or gap in the middle, not only the surface water is difficult to infiltrate, even if the outer cylinder is in the In the subsequent use process, the groundwater and harmful gas will cause perforation, etc., and because the outer surface of the gas storage cylinder has a layer of cement protection and strengthening layer that tightly wraps it, it can still effectively protect the gas storage cylinder from damage and ensure high-pressure storage. The service life of the gas well; in order to ensure that the cement protection reinforcement layer not only tightly wraps the outer surface of the inner layer gas storage cylinder, but also tightly connects the inner layer gas storage cylinder and the outer cylinder body into one effect, the fixing of the multilayer gas storage well cylinder body of the present invention The method is: first use geological drilling to open a foundation well, then lower the outer cylinder body with the grouting process hole at the bottom into the foundation well and insert the grouting pipe into the outer cylinder body, and its lower end communicates with the grouting process hole at the bottom of the outer cylinder body, Then start the grouting pump to pour cement slurry between the outer cylinder and the foundation well from bottom to top, stop pouring when the cement slurry overflows the ground, open the upper joint of the grouting pipe, install the rubber plug (grouting process hole), and then start the grouting pump. After pushing the rubber plug into the grouting process hole at the bottom of the outer cylinder, stop the pump; then pull the lower end of the grouting cannula away from the grouting process hole at the bottom of the outer cylinder, and clean the inner cavity of the outer cylinder; then seal the bottom of the cylinder There are grouting process holes on the head, and the gas storage cylinder with centralizers on the outer surface of the cylinder is lowered into the outer cylinder. After it is in place, the gas storage cylinder is clamped and fixed by the cylinder hoisting splint, and then the grouting pipe is inserted into the gas storage cylinder. , Its lower end is connected with the grouting process hole at the bottom of the gas storage cylinder and starts the grouting pump to pour cement slurry between the gas storage cylinder and the outer cylinder from bottom to top, stop pouring when the cement slurry overflows the ground, then pull out the grouting pipe and Through the bayonet at the lower end, screw the plug of the grouting process hole of the gas storage cylinder into the process hole to close it, and finally pull out the grouting pipe until the cement slurry solidifies to form a protective reinforcement layer

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