Hybrid drill bit and design method

A method of drilling subterranean formations, comprising:

• drilling with a first bit comprising:
• a first fixed blade, a second fixed blade, and a third fixed blade, wherein at least one of the fixed blades of the first, second, or third fixed blades has a first row of cutting elements arranged on a leading edge and configured to remove formation in cone, nose, and shoulder regions;
• a first truncated rolling cutter assembly, a second truncated rolling cutter assembly, and a third truncated rolling cutter assembly, wherein at least one of the truncated rolling cutter assemblies of the first, second, or third truncated rolling cutter assemblies has a plurality of rows of cutting elements configured to remove formation in at least the shoulder region, but not in the cone region;
• and
• wherein the first truncated rolling cutter assembly and the first fixed blade are spaced apart by a first angular distance and the second truncated rolling cutter assembly and the second fixed blade are spaced apart by a second angular distance, the first angular distance being different from the second angular distance,
• wherein the third truncated rolling cutter assembly is angularly spaced apart from the third fixed blade by a third angular distance, the third angular distance being different from the first angular distance and the second angular distance, and;
• determining aggressiveness of drilling with the first bit as a function of rate of formation penetration and weight-on-bit;
• and thereafter;
• and
• varying the aggressiveness of drilling by:
• drilling with another bit having an angular displacement between a truncated rolling cutter and a fixed blade cutter that is different than an angular displacement of first bit;
• or
• drilling with another bit having an effective projection between at least two adjacent cutting elements on a truncated rolling cutter that is different than an effective projection between adjacent cutting elements of at least one truncated rolling cutter assembly of the first bit;
• or
• drilling with another bit in which cutting elements on a rolling cutter lead cutting elements on a fixed blade more than on the first bit;
• or
• drilling with another bit in which cutting elements on a fixed blade lead cutting elements on a rolling cutter more than on the first bit;
• or
• drilling with another bit having cutting elements on opposing at least one fixed blade and cutting elements on at least one truncated rolling cutter such that the cutting elements track in the same kerf.