COMPONENTS OF DRILL STRING, HAVING MULTI-THREADED CONNECTIONS Russian patent published in 2020 - IPC E21B17/42 

FIELD: components and systems for drilling.

SUBSTANCE: threaded component of a drill string comprises a hollow body having a first end, an opposite second end and a central axis, passing through the hollow body and at least two threads located at the first end of the hollow body. Each of said at least two threads comprises a row of helical turns extending along the first end of the hollow body. Each of said at least two threads has thread recess, thread top, thread pitch and thread width. Each of said at least two threads has negative angle of side pressure side inclination. At least one parameter of thread width and thread pitch of said at least two threads increases from first value near front end at least on part of axial length of said row of its helical coils to final value in desired point on said at least one thread.

EFFECT: technical result is to provide reduced wear, jamming and spinning screwing, efficient use of available material, increased allowable load during drilling and reliability of connection.

33 cl, 6 dwg, 2 tbl