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

A technology for gas storage and oil and gas reservoirs, which is applied in earthwork drilling, mining equipment, mining equipment, etc. It can solve the problems of difficult control of gas-water interface, volume loss, and high cost of building storage, so as to meet the requirements of safe production and operation and prevent drilling Effects of complex accidents and supporting technical safety

Inactive Publication Date: 2013-05-08
DAGANG OIL FIELD GRP
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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

Method used

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

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Embodiment

[0053] Firstly, run the Φ508mm surface casing after the drilling is completed, and consolidate the surface casing in the wellbore according to the standard requirements; after consolidation, run a Φ273mm technical casing into the surface casing, and consolidate the technical casing according to the standard requirements In the surface casing and wellbore; after consolidation, run the Φ177.8mm oil layer casing in the technical casing, and consolidate the oil layer casing in the technical casing and the drill hole according to the standard requirements.

[0054] Then, during the drilling process, the drilling fluid technology, drilling technology, cementing technology, and well completion technology for protecting the gas reservoir were implemented. By predicting pore pressure, collapse pressure, and fracture pressure, for gas storages with a relatively high pressure coefficient in the initial target layer of Dazhangtuo gas storage, the drilling fluid density is determined accord...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/16
Inventor 张强刘延平李国韬宋桂华朱广海刘在桐王育新李路曾晓辉
Owner DAGANG OIL FIELD GRP
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