Cementing method for gas storage well casing tube

Abstract

The invention discloses a method for cementing a sleeve pipe of a gas storage well, which is characterized by comprising the following steps: (1) arranging one or more slurry filling pipes in the well, and filling cement slurry into the well bottom through the slurry filing pipes, wherein the cement slurry is added with a retarding agent; and (2) putting down the sleeve pipe of the gas storage well to touch the cement slurry at the well bottom, simultaneously continuing filling the cement slurry into the well through the slurry filling pipes until the cement slurry returns from the mouth of the well so as to ensure that the whole well is filled with the cement slurry, then stopping filling the slurry, and achieving the aim of completely cementing the well after the cement slurry solidifies. The method can guarantee that the bottom and the circumference of the sleeve pipe of the gas storage well are both covered by the cement and prevent the bottom of the sleeve pipe of the gas storage well from contacting with the ground floor, has the advantages of no easy loosening of the gas storage well and no corrosion of the bottom of the sleeve pipe of the gas storage well, and improves the well cementing quality.

Description

technical field [0001] The invention relates to a well cementing method for gas storage well casing. Background technique [0002] At present, when constructing a CNG filling station, the cementing method of its underground gas storage well casing is determined by figure 1 As shown, the gas storage well casing 5 is usually lowered to the bottom of the well, and then the grouting pipe 6 is installed in the well, and the cement slurry 7 is injected into the well through the grouting pipe 6 until the cement slurry 7 returns from the wellhead, so that the gas storage well casing 5 The space between the well wall and the well wall is filled with cement slurry 7, and then the grouting is stopped. After the cement slurry 7 solidifies, the purpose of well cementing is achieved; however, the bottom of the gas storage well casing 5 will still be in contact with the formation, and the gas storage well is easy to loosen. The bottom of the pipe 5 is also easily corroded, reducing the ce...

AI Technical Summary

Problems solved by technology

[0002] At present, when constructing a CNG filling station, the cementing method of its underground gas storage well casing is determined by figure 1 As shown, the gas storage well casing 5 is usually lowered to the bottom of the well, and then the grouting pipe 6 is installed in the well, and the cement slurry 7 is injected into the well through the grouting pipe 6 until the cement slurry 7 returns from the wellhead, so that the gas storage well casing 5 The space between the well wall and the well wall is filled with cement slurry 7, and then the grouting is stopped. After the cement slurry 7 is solidified, the purpose of well cementing is achieved; however, the bottom of the gas storage well casing 5 will still be in contact with the formation, and the gas storage well is easy to loosen. The bottom of the pipe 5 is also easily corroded, reducing the cementing quality

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