Salt removal and prevention injection-production integrated tubular column

Abstract

The invention provides a salt removal and prevention injection-production integrated pipe column. The salt removal and prevention injection-production integrated pipe column comprises a subsurface safety valve, a circulating sliding sleeve, a check valve, a packer, a seating connector, a ball seat and a horn mouth which are sequentially connected through oil pipes from top to bottom. The high-pressure pipeline is located in the oil sleeve annulus and connected with the check valve, and the injection end of the high-pressure pipeline is located at a wellhead. When the gas storage is in normal injection-production operation and no high-pressure fluid is injected into the high-pressure pipeline, the check valve can be closed. When the gas storage normally injects and extracts or shuts in a well and injects high-pressure fluid into the high-pressure pipeline, the check valve can be opened, and it is ensured that the high-pressure fluid enters the oil pipe through the check valve. According to the salt removal and prevention injection and production integrated pipe column, salt deposition near a gas storage injection and production well shaft and a shot hole can be effectively prevented, and continuous, stable and safe operation of a gas storage is guaranteed. And meanwhile, the complexity and the cost of salt removal and prevention operation of the gas storage are greatly reduced, so that the purpose of quickly and efficiently removing and preventing salt at low cost is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas storage injection and production operations, and in particular relates to an integrated pipe string for cleaning and preventing salt injection and production. Background technique [0002] In the depleted gas reservoir type gas storage with high salinity formation water, with the increase of injection and production rounds, salt formation and scaling in the wellbore are very easy to occur, resulting in narrowing or even complete blockage of natural gas flow channels, affecting gas storage normal operation of the library. At present, the methods of salt cleaning and salt prevention in gas storage mainly refer to the experience in the development stage of gas reservoirs, and measures such as washing salt with water, salt inhibitors for salt prevention or mechanical desalination are often taken. In the development stage, the oil and casing of the gas well production string are connected. Generally, clea...

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Problems solved by technology

Therefore, it has a great impact on the injection-production efficiency and normal operation of the gas storage

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