DRILL STRING, COMPONENTS HAVING MULTIPLE-THREAD THREADED JOINTS Russian patent published in 2017 - IPC E21B17/42 

FIELD: mining.

SUBSTANCE: group of inventions relates to drilling components and systems and, in particular, to drilling tool threaded joints, having higher strength, as well as resistance to jamming, cross threading and wedging. Drilling string threaded component includes hollow housing having first end, opposite second end and central axis, passing through hollow housing. There are two threads located at hollow housing first end and having front ends, which are arranged along circumference at distance of 180 degrees from each other near hollow housing first end front edge. Each of said two threads includes number of helical turns, extending along hollow housing first end from its location near hollow housing first end front edge in direction to hollow housing second end. Each of said two threads has thread recess, thread top, permanent thread pitch and thread width. Each of said threads under pressure has lateral side negative angle of inclination.

EFFECT: technical result is improvement of threaded connections reliability.

28 cl, 6 dwg