Air-tight sealing structure of oil casing and oil casing

• Main Authors: FAN XIAOXIAN, CAO QINGMENG, JIA WUJIANG, WANG RUIRUI, LI QINGQING, WANG KAI, DU RENZHI, ZHANG DUANGUANG, YU XUAN, ZHANG HONGYAN, GONG SHUZHAN, GAO FEI, PAN XIAOJIE, ZHU KUIMENG, SHEN JUNFANG, LI QIAN
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• 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 an oil casing air-tight sealing structure and an oil casing, and relates to the technical field of oil pipe sealing, the oil casing air-tight sealing structure provided by the invention comprises an external thread connector, and the peripheral surface of the external thread connector is sequentially provided with an external auxiliary sealing surface, a first external meshing surface, a shoulder external matching surface, an external main sealing surface and a second external meshing surface in the axial direction of the external thread connector; the outer auxiliary sealing face is located at the end of the external thread connector and protrudes to be in an arc shape, the shoulder outer matching face gradually inclines towards the second outer meshing face in the direction close to the axis of the external thread connector, and the outer main sealing face gradually gets away from the axis of the external thread connector in the direction away from the shoulder outer matching face. Th