OnGauge

Torque-reduction sealed-bearing roller reamer

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Torque reduction minimizes stick/slip and downhole vibration

Designed with a pressure compensated bullet seal and bearing assembly, the OnGauge torque-reduction sealed-bearing roller reamer reduces the downhole torque typically experienced using fixed-blade stabilizers. Torque reduction enables a more stable drilling environment, enabling extended runs in complex extended-reach wellbore geometries. Reducing downhole torque also improves weight transfer to the bit and minimizes stick/slip so that more energy is available at the bit to improve ROP and extend the operational life of the drill bit and MWD and LWD tools.

Torque reduction can be achieved using the OnGauge torque-reduction sealed-bearing roller reamer.

The OnGauge roller reamer has three cutter assemblies that rotate continuously, minimizing surface area and associated friction so that more torque transmits to the cutters to fracture and remove rock. Using a roller reamer will cause the BHA to have less parasitic torque, enabling more torque to go to the cutters, therefore fracturing and removing the rock more effectively.

Illustration of the OnGauge torque-reduction sealed-bearing roller reamer retention.

Reliable cutter retention is achieved through mechanical retention blocks. The tapered geometry forces the cutter block into the reamer body.

Cutter retention system provides assurance in harsh environments

A wedge-style cutter retention system prevents lost cutter incidents, and a durable sealed-bearing assembly ensures high loads, temperatures, and rotary speeds to extend bearing life.

Illustration of the OnGauge torque-reduction sealed-bearing roller reamer.

Specifications
Hole size, in	8 1/2	8 3/4	12 1/4	17 1/2
Tool length, in	87	87	111	116
Max. body diameter, in	7 24/25	7 24/25	11 71/100	15 1/2
Fishing neck diameter, in	6 3/4	6 3/4	8 1/4	9 1/2
Fishing neck length, in	28	28	39	39
Bore diameter, in	2 1/4	2 1/4	3	3
Annular flow area, in²	9.9	13.29	22.26	82.5
Max. recommended speed, rpm	150	150	150	150
Max. temperature, degF	300	300	300	300
Body weight, lbm	782	782	1,236	2,658
Recommended max. cutter revolutions, millions	10	10	10	10

Advantages

Usable in extended-reach drilling (ERD) operations and complex well geometries
Torque reduction for severely packed hole assemblies
Effective in extremely abrasive drilling conditions

Benefits

Reduces downhole torque caused by doglegs, wellbore spiraling, and the well profile
Maintains borehole quality and addresses ledging formations
Maintains hole gauge in abrasive conditions
Improves ROP and increases bit life due to reduced stick/slip

Maximum cutter revolutions: 10,000,000

Maximum rpm for 12.25 or larger: 125 rpm

Maximum rpm for 8.5 or smaller: 150 rpm

Maximum temperature: 300 degF

OnGauge

Torque-reduction sealed-bearing roller reamer