THREADED CONNECTION OF PIPES Russian patent published in 2003 - IPC

FIELD: threaded connection of casing and tubing strings utilized in oil and gas industry. SUBSTANCE: threaded connection of pipes includes embraced member which end has two independent male threads with same axial pitch arranged in sequence along axis and matching embracing member that has two corresponding independent female threads. Male thread of embraced member located near its end and female thread of embracing member corresponding to it and located on side of its body are conical and can be made interference fit while screwed. They have triangular profile with rounded vertexes and recesses. EFFECT: simplified design of threaded connection, expanded field of its application. 1 dwg