Patent Number: 9,970,237

Title: Steerable earth boring assembly

Abstract: A steerable earth boring assembly which includes an annular collar and a drive shaft with a drill bit, where the shaft pivots with respect to the collar. An upper portion of the shaft inserts into an orientation sleeve which resides in the collar. An axial bore is obliquely formed through the sleeve, and in which the upper portion inserts. Rotating the sleeve causes precession of the upper portion, thereby pivoting the drill bit obliquely to the collar. Selective rotation of the sleeve orients the drill bit into a designated orientation for forming a deviated wellbore. Included in the assembly is a flow tube with an end in sealing contact with the drive shaft.

Inventors: Davis; Treston Greggory (Sugar Land, TX), Marshall; Ricki Don (Sugar Land, TX)


International Classification: E21B 7/06 (20060101); E21B 7/04 (20060101)

Expiration Date: 2022-05-15 0:00:00