Well completion method for reconstructing brine discharging well of gas storage from old cavity of salt mine

• Main Authors: JIANG HAITAO, ZHOU DONGLIN, LEE RUEY-MIN, JIAO YUJIA, GUO HONGSHUAI, QI LEI, CHEN FEI
• Format: Patent
• Language: Chinese; English
• Published: 26.05.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to a well completion method for rebuilding a brine discharging well of a gas storage by an old salt mine cavity. The well completion method comprises the following steps of: selecting a plurality of old salt mine cavities with unexploited salt layers at the upper parts of cavity tops in an area to be rebuilt; brine sealing performance testing is carried out on the multiple alternative salt mine old cavities, and the salt mine old cavities with qualified sealing performance are selected for reconstruction; an instrument is used for detecting the salt mine old cavity near a shaft of an original salt mine old cavity production well, and the cavity shape and the size of the salt mine old cavity are accurately described; determining the position of a salt layer where the cavity bottom of the current salt mine old cavity is located, and determining a well track; drilling to a proper distance from the old cavity of the salt mine according to the well track, and running a casing for well cementa