Patent ID: 6102140
Filing Date: 2000-08-15
Classification: E21B

Abstract:
An insert for a rotary cone drill bit, the drill bit having a plurality of cones with each of the cones having a corresponding plurality of sockets for receiving one of the inserts, comprising:a unitary body having first and second matrix body portions with different compositions;the first matrix body portion being of preselected dimensions adapted for press fitting of the first matrix body portion within a respective socket of one of the cones, the second matrix body portion of the insert defining a cutting portion;the second matrix body portion of the insert formed with encrusted diamond pellets, tungsten carbide, and a binder fused with each other, and the second matrix body portion fused with the first matrix body portion of the insert to form the unitary body;each encrusted diamond pellet further comprising a diamond particle having a coating of hard material disposed on the exterior of the respective diamond particle with a plurality of first metallurgical bonds formed between the exterior of each diamond particle and the respective hard material coating; andeach encrusted diamond particle substantially free of heat degradation;the encrusted diamond pellets encapsulated in the second matrix body portion with a plurality of second metallurgical bonds formed between the respective hard material coating on each diamond particle and the second matrix body portion.