Natural gas hydrate reservoir sand prevention device

• Main Authors: LIU ZHIHUI, SUN JIAXIN, LIU TIANLE, LIU ZHICHAO, OU WENJIA, LUO QIANG, WANG DONGDONG, NING FULONG
• Format: Patent
• Language: Chinese; English
• Published: 30.11.2021
• 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 utility model provides a natural gas hydrate reservoir sand prevention device which comprises a sand blocking cylinder, a base pipe and a plurality of sand prevention units, the sand blocking cylinder and the base pipe are both of a hollow structure with the top end open, the base pipe is located in the sand blocking cylinder, the sand prevention units are arranged in the circumferential direction of the side wall of the base pipe, and each sand prevention unit comprises a cover cap, a cover body and a metal sheet. The cover cap and the cover body are each of a hollow cavity structure with the two ends open, a groove is formed in the inner side of the cover cap, the metal sheet is placed in the groove, the cover body comprises a cover body upper portion and a cover body lower portion, the cover cap is in threaded connection with the cover body upper portion, and the cover body lower portion is in threaded connection with the side wall of the base tube. The metal sheet only allows fine sand particles with