Patent ID: 11879335
Assignee: CANOPUS DRILLING SOLUTIONS HOLDING B.V.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 19:
20. The directional drilling system according to claim 11, wherein the abrasive particles are magnetic abrasive particles, the system further comprising a downhole recirculation unit for recirculation of the abrasive particles passed through the abrasive jet nozzles into impingement with the borehole bottom, said downhole recirculation unit comprising one or more magnets arranged such that one or more magnetic fields produced thereby attract abrasive particles from the stream downstream of said impingement thereof with the borehole bottom, and convey the attracted particles in a recirculation stream at a substantially constant flow rate to a mixing section through which said stream passes upstream of said abrasive jet nozzles.