We will come across rock HDD drilling project time to time. There are so many kinds of tricone bits options. Which one should be right for us? Let ZLCONN introduce to you.
Compress Strength <25mpa, Formation hardness: Very soft, Rock type: clay, silts, sands. Choose 111/124 tricone bit
Compress Strength 25 to 50mpa, Formation hardness: Soft, Rock type: claystone, marl, lignite,sandstone,tuff . Choose 116/137 437 tricone bit
Compress Strength 50 to 75mpa, Formation hardness: Middle soft, Rock type: claystone, marl, lignite,sandstone,tuff, Anhydrites… Choose 136/137 517 527 tricone bit
Compress Strength 75 to 100 mpa, Formation hardness: Medium, Rock type: Mudstone, Limestone,anhydrites, sandstone(calcareous) Choose 211/217 517 537 tricone bit