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 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, preparing extended slurry used for the protecting-reinforcing layer, and lowering the fuel gas storage cylinder and the multilayer fuel gas storage well cylinder for molding and fixing. 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 is 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 is prolonged, but also the breakage or explosion in the using process of the shaft of the fuel gas storage well can be prevented, and the like.

Description

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

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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. It not only tightly wraps the outer surface of the gas storage cylinder, but also tightly connects the inner layer of the gas storage cylinder with the outer cylinder to strengthen the inner layer of the gas storage cylinder to reduce the adverse effects of alternating loads on the gas storage cylinder during use. 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 due to cementing defects During the use of the gas storage cylinder, it is corroded by groundwater and harmful gases, causing perforation, etc. Since 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 gas storage wells service life; in order to ensure that the cement protection reinforcement layer not only tightly wraps the outer surface of the gas storage cylinder, but also tightly connects the inner gas storage cylinder and the outer cylinder body into one effect, the fixing method of the multi-layer gas storage well cylinder body of the present invention is: First, use geological drilling to open a foundation well, then lower the outer cylinder with a grouting hole at the bottom into the foundation well and insert the grouting pipe into the outer cylinder, and its lower end communicates with the grouting hole at the bottom of the outer cylinder, and then start grouting The pump pours cement slurry between the outer cylinder and the foundation well from bottom to top. When the cement slurry overflows the ground, stop pouring and open the upper joint of the grouting pipe, install the rubber plug (grouting process hole), and then start the grouting pump to remove the rubber plug. After pushing into the grouting process hole at the bottom of the outer cylinder, stop the pump; then pull the lower end of the grouting pipe away from the grouting process hole at the bottom of the outer cylinder to clean the inner cavity of the outer cylinder; then inject the inner cavity of the outer cylinder with a volume of 30 -50% retarding cement, finally sink the air storage cylinder with head and centralizer into the inner cavity of the outer cylinder filled with retarding cement, in order to ensure that the air storage cylinder sinks in place, inject fluid medium into the air storage cylinder as The counterweight is used to overcome the buoyancy of the retarded cement slurry until the air storage cylinder sinks in place and the retarded cement slurry overflows the upper mouth of the outer cylinder. After the retarded cement solidifies the air storage cylinder and the outer cylinder into one, pull out Fluid counterweight; after the multi-layer gas storage well body of the present invention is fixed and completed, the required wellhead device can be installed on the upper mouth of the gas storage well body according to requirements, which can be used to store high-pressure fuel gas

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