Packer and sealing method

• Main Authors: QIAO GENCAI, LIU YANPING, BAI JIE, LUO JINGBING, LI CHUNBAO, LIU JUNLIN, ZHANG GENHONG
• Format: Patent
• Language: Chinese; English
• Published: 20.09.2022
• 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

The invention discloses a packer and a sealing method, and belongs to the field of oil well downhole tools. The packer comprises a central pipe, a sealing cylinder arranged on the central pipe in a sleeving mode and a sealing assembly. The sealing assembly comprises a filtering ring, an overflowing cylinder, a hydraulic cylinder and an elastic element. When a first liquid is injected into the central pipe, the first liquid enters an annular space between the overflowing cylinder and the central pipe through a first through hole in the central pipe and a filtering channel in the filtering ring, and the first liquid in the annular space drives the overflowing cylinder to move downwards along the axis of the central pipe, so that an overflowing hole in the lower end of the overflowing cylinder is separated from a boss on the central pipe; and the first liquid enters an annular space between the sealing cylinder and the central pipe through the flowing holes. Under the pressure of the first liquid on the sealing