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PDC drill bits, or fixed cutters, come in either matrix

PDC drill bits, or fixed cutters, come in either matrix or steel body. One might ask, What is the difference? and Which one do I need?

 

Matrix body fixed cutters are made from tungsten carbide material. This provides improved wear resistance and erosion.

Additionally, they are typically more heavy set as far as cutter count.

In applications of high fluid volume or high sand, matrix body bits offer longer life and multiple bit runs.

 

Steel body fixed cutters are made from a high alloy steel. These bits can sometimes be repaired and may be good for multiple runs, depending on the application.

Because steel is better able to withstand high impact, steel body bits are often designed with higher blade stand-off and cutter exposure, thusincreasing ROP.

The invention of the PDC cutter propelled the fixed cutter to the forefront of the drilling industry and the idea instantly took off.

However, a number of design features had to be considered. Below are common aspects of PDC design that every engineer has to consider:

*Gage Pads

*Cutter Profile

*Cutter Layout

*Blade Layout

*Impact Arrestors

*Cutter Force Balancing

*PDC Cutter Technology

*Cutter Energy Balancing

Although fixed cutters differ in design aspects from roller cone bits, they share much in common. Both have pins that conform to API standards and both are manufactured to specific plus or minus tolerances. Both fixed cutters and roller cone bits are dull graded the same way.