The oriented bent sub is a major power deflection tool having a fixed angle deviated from the low end thread of the bent sub to the axial line of drill stem. Under the application of oriented bent sub the power drill tool give the bit a constant lateral force to ensure that the bit can cut on the well wall laterally and further drill into a curved well trace.

　　The material of oriented bent sub is usually 4145H/ 4145H-MOD /Non-magnetic alloy.

　　Available outer diameter range: 89-203 mm