Concave-convex arc interference fit sealing special screwed joint for oil casing

• Main Authors: LIU YI, WANG HAILONG, ZHANG JUGUO, WANG YUHAI, ZHANG KE, ZHANG JIANGUANG
• Format: Patent
• Language: Chinese; English
• Published: 28.04.2023
• 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

A concave-convex arc interference fit sealing special threaded connector for an oil casing comprises a connected external threaded pipe body and a coupling used for connection and provided with internal threads, and further comprises concave and convex arc surface interference fit mechanisms, and the external threaded pipe body is connected with the end of the coupling with the internal threads through the concave and convex arc surface interference fit mechanisms; the concave cambered surface interference fit mechanism comprises a first internal thread convex cambered surface, a first linear section, a first chamfer cambered surface, a first shoulder included angle, a first external thread concave cambered surface, a second linear section and a second chamfer cambered surface, and the first internal thread convex cambered surface is arranged at the position, close to the internal shoulder, of the coupling; a first linear section is arranged at one end of the first internal thread convex cambered surface, and