Roller Cone Bits: Grand Product Line
Large diameter three cone bits with open bearings, designed for drilling upper well sections (surface hole drilling) with up to 600 RPM.
Without sealing elements in the bearing, it is possible to maximize the journal and the rollers dimensions. This enables to achieve full circulation in the bearing which is highly important as it helps reducing the torque, providing quick cooling action and increasing bearing life.
Bearing life is greatly extended due to hardfacing of radial and thrust journal bearing surfaces with wear-resistant hard alloy.
The cutting structure is designed to guarantee maximum wear resistance and increased bit life. Depending on the formations’ hardness and abrasiveness, drill bits can have a cutting structure of steel teeth or TCI. To increase durability, the steel teeth are hardfaced with wear-resistant tungsten carbide based material. Where it is required, gauge is protected with tungsten carbide compacts. Hard grain alloy is applied along the shirttail and leg leading edge.
Some Grand Steel Tooth Bits
|Old Designation||NewDesignation||Size: mm / in||IADC||PIN Size, "|
|V-K11T||GRD111||660.4 / 26||111||7 5/8 API REG|
|V-K12T||GRD121||660.4 / 26||121||7 5/8 API REG|
|V-K13T||GRD131||660.4 / 26||131||7 5/8 API REG|
|V-KL11||GRD111||555 / 21_17/20||111||7 5/8 API REG|
|V-KL11||GRD111||508 / 20||111||7 5/8 API REG|
|V-KL11||GRD111||490 / 19_19/64||111||7 5/8 API REG|
|V-KL11||GRD213||490 / 19_19/64||213||7 5/8 API REG|
|V-KL11||GRD111||444.5 / 17_1/2||111||7 5/8 API REG|
|V-KLS31T||GRD311||444.5 / 17_1/2||311||7 5/8 API REG|
|V-K11T||GRD111||393.7 / 15_1/2||111||7 5/8 API REG|
|V-K21||GRD211||393.7 / 15_1/2||211||7 5/8 API REG|