| Type |
IADC Code |
Application |
Recommanded Parameter |
| Weight on Bit (KN/mm) |
Rotary Speed (r/mm) |
| RA111 |
111 |
It is suitable for very soft formation such as clay, silts sand etc |
0.3-0.15 |
180-30 |
| RA114 RA115 |
114 115 |
very soft formation with low compressive strength and high drillability, such as stone, mudstone, white powder etc |
0.3-0.75 |
180-60 |
| RA116 RA117 |
116 117 |
It is suitable for extremelyt soft formations with high resistance to pressure and drillability, such as soft shales, clay, salt rock, etc |
0.35~0.9 |
150~80 |
| RA124 RA125 |
124 125 |
Soft formations with low compressive strength and high drillaility, such as mudsone, gypsum, salt rock, soft shales, soft limesone, etc. |
0.3-0.85 |
180-60 |
| RA126 RA127 |
126 127 |
It is applicable to soft formations with high drillability against pressure, such as shale, clay, salt rock, soft lime, etc |
0.35~1.0 |
150~70 |
| RA134 RA135 |
134 135 |
Soft to medium soft formations with low compressive strength and high drillability, such as medium soft shales, antydrite, medium soft affordable, medium soft sandstone and soft formations with hard interlayers. |
0.3-0.95 |
150-60 |
| RA136 RA137 |
136 137 |
It is suitable for soft to medium soft stratum with compressive strength or hard interlayer in soft stratum, such as anthydrite, soft limestone, sandstone, etc |
0.35~1.05 |
120~60 |
| RA211 |
211 |
It is suitable for medium hard formaiton such as limestone, anhydrites, dolomite etc. |
0.15-0.25 |
150-30 |
| RA216 RA217 |
216 217 |
Suitable for medium hardness with high pressure resistance and hard interlayer, such as hard shale, sandstone, limestone, etc |
0.5~1.20 |
90~50 |
| RA244 |
244 |
Medium-hard formations with high compressive strength, such as abrasive shales, limestone, sandstone, dolomite, anthydrite, marble,etc. |
0.5~1.20 |
100~50 |
| RA246 RA247 |
246 247 |
Medium-hard formations with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc. |
0.4~1.0 |
80~50 |
| RA311 |
311 |
Suitable for hard formation, such as shale(calcareous), sandstone(siliceous) siltsone etc |
1.0~1.15 |
150~100 |
| RA317 |
317 |
Suitable for high compressive strength, medium hard and abrasive formations, such as limestone, dolomite, sandstone, flint, etc |
0.7~1.30 |
80~45 |
| RA324 |
324 |
Moderately abrasive formations such as abrasive shale, limestone, sandstone, dolomite, anhydrite, marble, etc |
0.4~1.0 |
120~50 |
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