Cavity dissolving method and cavity dissolving equipment for salt cavern gas storage with thick interlayer

• Main Authors: LIANG XIAOPENG, CAI RUI, YANG CHUNHE, ZHAO KAI, MA HONGLING, LI YINPING, LIU YUANXI, SHI XILIN
• Format: Patent
• Language: Chinese; English
• Published: 11.02.2022
• 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; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention provides a cavity dissolving method for a salt cavern gas storage with a thick interlayer, the salt cavern gas storage is built in a first salt rock layer and a second salt rock layer, and the cavity dissolving method comprises the following steps: a well body with a preset depth is drilled from the ground to the underground; then a production casing pipe, a cavity-building inner pipe and a cavity-building outer pipe are sequentially lowered to the first salt rock layer from the well mouth of the well body for cavity dissolving, so that a first cavity is obtained, perforation is conducted on the circumferential outer wall of the production casing pipe after cavity dissolving of the first cavity is completed, and the first interval is made to communicate with a second salt rock layer through holes; after the cavity construction inner pipe and the cavity construction outer pipe are synchronously moved into the second salt rock layer, cavity dissolving is conducted on the second salt rock layer, an