Method for constructing underground gas storage by depleted oil-gas reservoir

Abstract

A method for constructing an underground gas storage by a depleted oil-gas reservoir includes the steps: firstly, drilling a well; secondly, performing injection-production well completion interaction; thirdly, controlling injection-production well safety; fourthly, optimizing corrosion prevention; fifthly, monitoring formation parameters; sixthly, plugging an old well; and seventhly, expanding water drainage capacity. The method has the advantages that reservoir protection effects are obvious, matching technology is safe, environment-friendly and energy-saving, a well field and a wellhead are reasonably arranged, drilling speed is high, complex well drilling accidents are prevented, the requirements of an injection-production well on safety production and operation can be met, and the underground gas storage is large in storage volume, high in mobility and wide in peak-shaving range.

Description

technical field [0001] The invention relates to a method for repeatedly utilizing depleted oil and gas reservoirs to build an underground gas storage, which belongs to the category of development and reuse of oil and gas reservoirs, and is a method for reusing and gas storage operation of depleted oil and gas reservoirs. Background technique [0002] The types of underground gas storage generally include rock salt caverns, depleted oil fields, underground aquifers, and depleted oil and gas fields. [0003] Salt cavern underground gas storage has a small storage capacity; salt layer creep can easily cause casing damage, resulting in a large volume loss; brine discharge and leakage may cause gas loss; There are certain risks in terms of sealing and stability. [0004] The gas storage rebuilt in the depleted oil field has unrecoverable dead oil in the oil reservoir, and a certain amount of crude oil is carried in the recovered gas, which requires special treatment, which limit...

AI Technical Summary

Problems solved by technology

[0003] Salt cavern underground gas storage has a small storage capacity; salt layer creep can easily cause casing damage, resulting in a large volume loss; brine discharge and leakage may cause gas loss; There are certain risks in sealing and stability

[0004] The gas storage rebuilt in the depleted oil field has unrecoverable dead oil in the oil reservoir, and the recovered gas carries a certain amount of crude oil, which requires special treatment, which limits its application

[0005] Because there is no gas in the underground aquifer gas storage, the amount of cushion gas required is relatively large, and this part of the gas cannot be produced, and the gas-water interface is difficult to control. The "gas-driven water" method is easy to generate gas Tapering, so the cost of building a library is high and the construction period is long

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