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

Abstract

The invention belongs to a multilayer gas storage well cylinder body for a high-pressure fuel gas underground gas storage well and a molding method thereof. The gas storage well cylinder body comprises an inner layer gas storage well cylinder body, a cement protection reinforced layer and an outer cylinder body. The molding method comprises the following steps: drilling a basic well; preparing retarding cement slurry and fixing the outer cylinder body; preparing the retarding cement slurry used for a protection reinforced layer; fixing the gas storage cylinder body; and molding the multilayer gas storage well cylinder body. In the multilayer gas storage well cylinder body, the cement protection reinforced layer which can be tightly packed on the outer surface of the gas storage cylinder body and fastens the gas storage cylinder body and the outer cylinder body into a whole is additionally arranged on the basis of a traditional two-pipe underground gas storage well, therefore, corrosion to the gas storage cylinder body by underground water can be completely isolated in the use process, the well fixing effect is effectively improved, frequent deformation amplitude of the gas storage cylinder body due to alternating load is greatly reduced, the safety and the reliability of gas storage and operation of the underground gas storage well are ensured, the service life of the gas storage well is prolonged, breakage or explosion accidents of a well cylinder of the gas storage well are prevented in the use process, 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 forming method of the well body, in particular to a multi-layer gas storage well casing for underground high-pressure fuel gas containing a gas storage casing, a cement protection reinforcement layer and an outer casing protection layer. The shaft body for gas storage, and the forming method of the shaft body; adopting the multi-layer gas storage shaft body for underground gas storage wells of high-pressure fuel gas of the present invention to store high-pressure fuel gas can ensure that the outer surface of the gas storage shaft is uniformly covered by cement and is in contact with the outer surface. The cylinder is fastened into one body, so that the strength of the gas storage cylinder can be enhanced, and the gas storage cylinder can be effectively prevented from being corroded by groundwater and harmful gases, so as to ensure...

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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". The reinforcement layer 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, which strengthens the inner layer of the gas storage cylinder to reduce the impact of alternating loads on the gas storage cylinder during use. In addition, because 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 immerse, even if the outer cylinder is due to cementing defects In the subsequent use process, it will be perforated due to the corrosion of groundwater and harmful gases. 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. The service life of the gas storage well; 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 layer of the gas storage cylinder with the outer cylinder body, the fixing method of the multi-layer gas storage well cylinder body of the present invention It is: first use geological drilling to set up a foundation well, inject the prepared slow-setting cement slurry into the foundation well to 40-55% of the volume of the foundation well, and then lower the outer cylinder with a sealing head at the bottom into the foundation well. After the cylinder is lowered below the surface of the retarded cement slurry, counterweights are put into the outer cylinder to overcome the buoyancy of the retarded cement slurry, until the outer cylinder sinks in place and the retarded cement slurry overflows the upper mouth of the outer cylinder After the retarded cement has solidified the outer cylinder body and the foundation well into one, take out the counterweight; then inject the prepared retarded cement slurry into the outer cylinder body to 30-50% of the inner cavity volume of the outer cylinder, and then put the The air storage cylinder of the head and centralizer sinks into the inner cavity of the outer cylinder filled with retarded cement. In order to ensure that the air storage cylinder sinks in place, a fluid medium is injected into the air storage cylinder as a counterweight to overcome the buoyancy of the retarded cement slurry , until the gas storage cylinder sinks in place and the retarded cement slurry overflows the upper mouth of the outer cylinder, after the retarded cement slurry solidifies and the gas storage cylinder and the outer cylinder are fixed together, the fluid counterweight is drawn out

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