1.standard: API7-1 2.OD:79.4mm-279.4mm 3. factory directly delivery
Spiral drill collar is the main products in Jiangsu HEXIN, such drill collar can provent drilling process in the differential pressure block, the spiral groove will allow the mud around the drill collar of freedom flow to differentialpressure sticking. With the drilling shaft to reduce the contact area. Which can effectively reduce the block have the possibility of differential pressure.
Spiral drill collar had been widely used because of the characteristics of its own decesion,this special spiral drill collar to reduce the tube wall and the contact area. The drill sting so as to avoid “sticking”phenomenon.
Type | OD(mm) | ID(mm) | L(m) ±152.4mm d | DF(mm) ±0.4 |
NC23-31 | 79.4 | 31.8 | 9.14 | 76.2 |
NC26-35 | 88.9 | 38.1 | 9.14 | 82.9 |
NC31-41 | 104.8 | 50.8 | 9.14or9.45 | 100.4 |
NC35-47 | 120.6 | 50.8 | 9.14or9.45 | 114.7 |
NC38-50 | 127 | 57.2 | 9.14or9.45 | 121 |
NC44-60 | 152.4 | 57.2 | 9.14or9.45 | 144.5 |
NC44-60 | 152.4 | 71.4 | 9.14or9.45 | 144.5 |
NC46-62 | 158.8 | 57.2 | 9.14or9.45 | 149.2 |
NC46-62 | 158.8 | 71.4 | 9.14or9.45 | 150 |
NC46-65 | 165.1 | 57.2 | 9.14or9.45 | 154.8 |
NC46-65 | 165.1 | 71.4 | 9.14or9.45 | 154.8 |
NC46-67 | 171.4 | 57.2 | 9.14or9.45 | 159.5 |
NC50-70 | 177.8 | 57.2 | 9.14or9.45 | 164.7 |
NC50-70 | 177.8 | 71.4 | 9.14or9.45 | 164.7 |
NC50-72 | 184.2 | 71.4 | 9.14or9.45 | 169.5 |
NC56-77 | 196.8 | 71.4 | 9.14or9.45 | 185.3 |
NC56-80 | 203.2 | 71.4 | 9.14or9.45 | 190.1 |
6-5/8REG | 209.6 | 71.4 | 9.14or9.45 | 195.6 |
NC61-90 | 228.6 | 71.4 | 9.14or9.45 | 212.7 |
7-5/8REG | 241.3 | 76.2 | 9.14or9.45 | 223.8 |
NC70-97 | 247.6 | 76.2 | 9.14or9.45 | 232.6 |
NC70-100 | 254 | 76.2 | 9.14or9.45 | 237.3 |
8-5/8REG | 279.4 | 76.2 | 9.14or9.45 | 266.7 |
NC50-67 | 171.5 | 71.4 | 9.14or9.45 | 159.5 |
spiral drill collars 279.4mm*76.2mm
