Gas injection and brine discharge method and device for salt cavern gas storage
A technology for gas storage and gas injection, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve the problems of small diameter of the brine discharge pipe, increase the operation risk, and increase the pressure of brine discharge, and achieve the goal of improving the discharge rate. The effect of halogen flow, saving operating procedures and operating costs, and reducing brine discharge time
Active Publication Date: 2019-05-07
PETROCHINA CO LTD
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Problems solved by technology
[0005] The diameter of the brine discharge pipe provided by the prior art is small, resulting in low flow of brine discharge, long time for brine discharge and high pressure of brine discharge, and taking out the brine discharge pipe under pressure will increase the operational risk
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[0036] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art. In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0037] An embodiment of the present invention provides a method for gas injection and brine removal in a salt cavern gas storage. The gas injection and brine removal method includes the following steps:
[0038] Step 101, after the cavity creation is completed in the cavity creation well, the cavity creation string is pulled out.
[0039] Step 102: Run the gas injection and production string into the production string of the cavity-making well, wherein the gas injection and production string carries a downhole safety valve, a permanent packer and a hand sub.
[0040] ...
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The invention discloses a gas injection and brine discharging method and device for a salt-cavern gas storage and belongs to the technical field of well completion. The method comprises the steps that after cavity construction in a cavity construction well, a cavity construction pipe column is taken out; a gas injection-production pipe column is put in a production pipe column of the cavity construction well, and the gas injection-production pipe column carries a downhole safety valve, a permanent packer and a releasing pipe nipple; natural gas is injected into an annular space of the production pipe column and the gas injection-production pipe column, so that brine in a cavity is discharged from the gas injection-production pipe column; after the brine is completely displaced from the cavity, the gas injection-production pipe column is cut off at the releasing pipe nipple, so that the releasing pipe nipple and the part, below the releasing pipe nipple, of the gas injection-production pipe column are discarded inside the cavity; and the permanent packer is subjected to setting, annular space protection fluid is injected into the annular space between the production pipe column and the gas injection-production pipe column, and gas injection and brine discharging of the salt-cavern gas storage is finished. According to the gas injection and brine discharging method, the brine discharging amount and brine discharging efficiency can be improved, the operation working procedure and operation cost can further be saved, and the operation risk is reduced significantly.
Description
technical field [0001] The invention relates to the technical field of well completion, in particular to a method and device for gas injection and brine discharge of a salt cavern gas storage. Background technique [0002] Salt cavern gas storage is a salt rock cavern that uses artificial methods to form a cave storage space through water dissolution in thicker salt layers or salt domes underground to store natural gas. for its smooth application. Therefore, it is necessary to provide a gas injection and brine discharge method for salt cavern gas storage. [0003] In the prior art, the following methods are used to inject gas and discharge brine in the salt cavern gas storage: 1) After the cavity is built in the cavity well, the cavity is pulled out; 2) Injection and production are run in the production string of the cavity The gas string, which carries the downhole safety valve and the permanent packer, lowers the injection and production gas string into the last casing i...
Claims
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IPC IPC(8): E21B43/00
CPCE21B43/00
Inventor 杨海军郭凯
Owner PETROCHINA CO LTD