Plugging method for abandoned well of gas storage

A technology for gas storage and abandoned wells, which is applied in earthwork drilling, sealing/isolation, wellbore/well components, etc. It can solve the problem of up and down migration, or migration to non-gas storage layers and wellheads, affecting a well Well production safety, unsealed wells to be plugged, etc., to achieve permanent plugging effect, quality assurance, safe operation, and good results

Pending Publication Date: 2021-11-02
PETROCHINA CO LTD
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Problems solved by technology

[0004] However, because the operation of the gas storage has the characteristics of periodic strong production and strong injection, even after it is plugged, it still bears high and low pressure alternating loads. Therefore, the above method directly plugs the abandoned well to be plugged, which will make There is a certain micro gap between the cement p

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  • Plugging method for abandoned well of gas storage
  • Plugging method for abandoned well of gas storage
  • Plugging method for abandoned well of gas storage

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[0045] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0046] An embodiment of the present disclosure provides a plugging method for an abandoned well of a gas storage. In order to better describe the plugging method, first combine figure 1 , to illustrate the formation structure of the abandoned well to be plugged.

[0047]The abandoned well to be plugged includes artificial well bottom 1, reservoir 2, cap layer 3 and casing 4, artificial well bottom 1 is located at the bottom of the abandoned well to be plugged, reservoir 2 is located above artificial well bottom 1, and cap layer 3 is located above the reservoir 2, and the caprock 3 is used to seal the reservoir 2.

[0048] The caprock 3 is generally implemented to seal the reservoir 2 by pouring cement plugs. The casing 4 is arran...

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Abstract

The invention provides a plugging method for an abandoned well of a gas storage, and belongs to the technical field of gas storage production. The plugging method comprises the steps that superfine cement paste is injected into the position, corresponding to a reservoir stratum, in the to-be-plugged abandoned well, and a reservoir stratum cement plug is formed in the to-be-plugged abandoned well to plug the reservoir stratum; conventional cement paste is injected into the position, corresponding to a cover layer, in the to-be-plugged abandoned well, a cover layer cement plug is formed in the to-be-plugged abandoned well to plug the cover layer, and the cover layer is an original layer located above the reservoir stratum and used for sealing the reservoir stratum; the conventional cement paste is injected into the position above the cover layer cement plug in the to-be-plugged abandoned well, and a continuous cement plug is formed above the cover layer to plug the cover layer cement plug; and barite paste is injected into the position above the continuous cement plug in the to-be-plugged abandoned well, and a heavy cement plug is formed above the continuous cement plug to compact and seal the continuous cement plug. According to the plugging method for the abandoned well of the gas storage, the plugging effect can be remarkably improved.

Description

technical field [0001] The disclosure belongs to the technical field of gas storage production, in particular to a plugging method for an abandoned well of a gas storage. Background technique [0002] Gas storage is a kind of artificial gas field or gas reservoir formed by reinjecting commercial natural gas transported by long-distance pipelines into underground space. Then set up gas storage wells in the gas storage for gas production. The production characteristics of gas storage wells are high-pressure gas injection in spring, summer and autumn, and large-volume gas production in winter to ensure normal gas supply. During the gas injection process, the abandoned wells to be plugged in the gas storage are also subjected to the same high pressure, and the formation pressure is relatively high in the later stage of gas injection. Blocking processing operations. [0003] In related technologies, the plugging of abandoned wells to be plugged in the gas storage generally ado...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/138E21F17/16
CPCE21B33/13E21B33/138E21F17/16
Inventor 杨晶张裔张艳茹李昊辰柳灵艳张涵张新胜张亚明李军
Owner PETROCHINA CO LTD
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