Gas extraction and coal seam water injection integrated multipurpose coal seam drilling and sealing device and method

• Main Authors: HU PENG, SUN BIAO, ZHOU GANG, WANG GANG, ZHU MUYAO, YANG HE, YANG WENZHI, SHENG KAIHUA, LIU ZHEN, CHENG WEIMIN
• Format: Patent
• Language: Chinese; English
• Published: 17.06.2022
• 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 discloses a gas extraction and coal seam water injection integrated multipurpose coal seam drilling and sealing device which comprises a drilling sleeve tightly attached to the inner wall of a water injection hole, a hole sealing assembly and a water injection and gas extraction pipe penetrating through the hole sealing assembly, and the hole sealing assembly comprises a hole bottom hole sealing assembly and an orifice hole sealing assembly which are located at the front end and the rear end in the drilling sleeve; the invention further provides a gas extraction and coal seam water injection integrated multipurpose coal seam drilling and sealing method which comprises the following steps that A, a water injection hole is formed through drilling construction, and the gas extraction and coal seam water injection integrated multipurpose coal seam drilling and sealing device is installed in the water injection hole; b, under-pressure grouting is conducted through the grouting pipe, grouting is stopp