Underground washable well water injection inserting pipe sealing device

• Main Authors: WANG WEI, YAO BIN, JU YAFENG, HU GAIXING, HE RUXIAN, SHEN XIAOLI, WANG SHOUHU, WANG XIAOE, WANG JUNTAO
• Format: Patent
• Language: English
• Published: 16.12.2015
• 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 oil field separated layer water injection development and relates to an underground washable well water injection inserting pipe sealing device comprising a tubular main joint, a sheath and a lower joint, wherein the internal diameters of the sheath and the lower joint are equal, the internal diameter of the tubular main joint is gradient and is gradually increased from the lower part to the upper part, and the minimum internal diameter of the tubular main joint is equal to the internal diameters of the sheath and the lower joint; and a mounting hole penetrating through the tubular wall is also formed in the tubular wall of the main joint and is internally provided with a check valve for realizing one-way communication of the outside and the inside of the tubular wall of the main joint. By using the underground washable well water injection inserting pipe sealing device, the requirement for sealing concentric double-pipe separate injection inserting pipes of a separate injection well can be met, meanwhile, the problem of inserting pipe sealing element failure caused by scale formation and fallen object deposition easily generated at the sealed parts of inserting pipes because the conventional concentric double-pipe separate injection sealing mechanism cannot be self-washed is effectively solved, the sealing reliability of an inserting pipe sealing element can be improved, the success rate of separate injection operation of double concentric pipes can be increased, and the efficient developing effect of a separate injection well for an oil field can be achieved.