Pressure-maintaining coring mechanism, rope pressure-maintaining coring device and pressure-maintaining coring method

• Main Authors: ZHU GUANGHUI, GUO YING, ZHAO TONG, MI HONGGANG, KONG LINGQIANG, FAN ZHILI, PENG WENCHUN, WU JIAN, CHAO WEIWEI, WANG BO
• Format: Patent
• Language: Chinese; English
• Published: 11.06.2024
• 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 belongs to the technical field of well drilling coring, and discloses a pressure maintaining coring mechanism which comprises a pressure maintaining coring device, a pressure maintaining bin assembly, a plugging ring and a pressure divider. The pressure maintaining coring device comprises a heat preservation pipe and an inner layer pipe, the inner layer pipe is coaxially arranged in the heat preservation pipe, and a first annular space is formed between the inner layer pipe and the heat preservation pipe; the pressure maintaining bin assembly comprises a carrying pipe, and a sealing seat is inserted into the inner-layer pipe in a sealed mode to form a second annulus. The carrying pipe comprises an inner wall and an outer wall, a sealed third annular space is formed between the inner wall and the outer wall, and the carrying pipe has elasticity; the plugging ring is hermetically inserted into the inner-layer pipe to plug the second annulus; the pressure divider comprises a pressure dividing drivi