Depleted oil-gas reservoir underground gas storage injection-production string and operating method thereof
An injection-production pipe string and oil and gas reservoir technology, which is applied to the field of injection-production pipe string of underground gas storage, can solve the problems of volume loss, inability to recover oil, and high cost of construction, achieve reasonable structure, and meet the requirements of snubbing and workover. Effect
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[0031] The present invention will be further described below with reference to the drawings and embodiments. However, those skilled in the art should know that the present invention is not limited to the specific embodiments listed, as long as it conforms to the spirit of the present invention, it should be included in the protection scope of the present invention.
[0032] See attached figure 1 . Depleted oil and gas reservoir underground gas storage injection and production pipe strings, there are depleted oil and gas reservoirs underground, and the surface casing 2, technical casing 3, oil layer casing 4, and oil layer casing 4 are consolidated from the outside to the inside. From the wellhead to the bottom of the gas storage layer 11, the injection and production string is located in the oil layer casing 4.
[0033] The injection and production string includes tubing 7, safety valve 1, telescopic tube 5, circulation sliding sleeve 6, packer 8, seated sub 9, and safety valve 1...
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