METHOD FOR ABANDONMENT OF PRESSURE WATER SUPPLY WELL Russian patent published in 2017 - IPC E21B33/13 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to construction in oil industry, namely to the method of abandonment of pressure water supply wells in pre-emergency condition. The method of abandonment of pressure water supply wells involves the tie-in to the network pipeline of pipelines for supplying of compressed air to displace water through the borehole filter to the upper mark of the aquifer followed by supply of cement slurry into the well casing. Initially, the cup of the well above the main set valve an additional valve with the flow passage, close to the flow area of the casing is mounted. The additional valve is closed and the main valve is opened fully. Then through the network pipeline compressed air is supplied to displace from the casing the water through the borehole filter up to the upper mark of the aquifer. Then the additional valve is connected by the pipeline from cement slurry pump. The cement slurry pump is activated and the cement slurry injection pressure and compressed air pressure are equalized, the compressed air supply is closed. Then the additional valve is opened and the well casing is completely filled with cement slurry. After that the additional valve is closed and the compressed air piping and cement slurry lines are disconnected.

EFFECT: invention improves reliability of abandonment works.

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