Fig. 3

Concept of a physical method for lost circulation prevention and plugging whilst drilling. 1—drill collar; 2—hydraulic tool; 3—jet; 4—bit; 5—bit nozzle; 6—bottom; 7—thief zone; 8—wellbore wall; 9—annulus.

Concept of a physical method for lost circulation prevention and plugging whilst drilling. 1—drill collar; 2—hydraulic tool; 3—jet; 4—bit; 5—bit nozzle; 6—bottom; 7—thief zone; 8—wellbore wall; 9—annulus.