Permanent water stopping device and method for one-hole same-diameter drill hole of double confined aquifer

• Main Authors: LI XIAOLONG, YANG WENXUAN, CAI KAIXUAN, LI YUAN, WANG XIAOGANG, MA SEN, NIU WENBIN, ZHAI QIN
• Format: Patent
• Language: Chinese; English
• Published: 19.07.2024
• 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 provides a permanent water stopping device for one-hole same-diameter drilling of double confined aquifers. The permanent water stopping device comprises a pipe body, a separation supporting ring, an expansion material layer, a lubricating layer, a plugging material and an elastic piece. The plugging material is adopted to plug the lower end of the pipe body, and it is ensured that cement grout overflows to the annulus from the small hole of the pipe body; the expansion material layer is wound between the two separation supporting rings, so that the kelp sections are prevented from being scoured by water flow in the drilling process; the funnel-shaped elastic piece is adopted, and it is ensured that cement grout is precipitated and solidified upwards in the annular space. The invention further discloses a permanent water stopping method for the same-diameter drill holes of the double confined aquifer, the reasonably-graded casing pipes are selected according to the API drill bit size standard, a