Drill collar for oil wells

Claim 1

A DRILL COLLAR CONNECTED INTERMEDIATELY OF A DRILL BIT AND A STRING OF DRILL PIPE FOR DRILLING A WELL BORE IN THE EARTH, COMPRISING: AN ELONGATE, TUBULAR STEM HAVING UPPER MEANS AND LOWER MEANS FOR CONNECTING SAID STEM TO SAID DRILL PIPE AND SAID DRILL BIT, RESPECTIVELY; AND A PLURALITY OF HELICAL THREADS INTERMEDIATE SAID UPPER AND LOWER MEANS, THE RADIUS OF SAID THREADS BEING GREATER THAN THE RADIOUS OF SAID DRILL PIPE AND SAID UPPER AND LOWER MEANS AND ONLY SLIGHTLY LESS THAN THE RADIUS OF SAID BORE TO LIMIT LATERAL MOVEMENT OF SAID DRILL COLLAR THEREBY KEEPING SAID BIT DIRECTED ALONG THE LONGITUDINAL AXIS OF SAID DRILL COLLAR, BUT WITHOUT SUBSTANTIAL CUTTING ACTION, EACH TWO ADJACENT THREADS CREATING A HELICAL GROOVE THEREBETWEEN HAVING A FIRST OR LOWER WALL ESSENTIALLY PERPENDICULAR TO THE LONGITUDINAL AXIS OF SAID DRILL COLLAR ON WHICH MATERIAL LOOSENED FROM THE EARTH BY SAID BIT IS TRANSPORTED FROM SAID BIT UPWARDLY INTO SAID BORE ABOVE SAID DRILL COLLAR AND HAVING A SECOND OR UPPER WALL INTERSECTING SAID FIRST WALL ALONG A HELICAL LINE EXTENDING THROUGHOUT THE LENGTH OF THE GROOVE AND SAID SECOND WALL CURVING UPWARDLY AND OUTWARDLY THEREFROM TO FORM THE LOWER SURFACE OF THE THREAD THEREABOVE, SAID SECOND WALL SERVING TO MAINTAIN SAID LOOSENED MATERIAL ON SAID FIRST WALL, WHEREBY SAID LOOSENED MATERIAL IS MORE EFFECTIVELY MOVED UPWARDLY FROM THE BIT.