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Bowl and slips
| Diamond Glossary (алмазы и бриллианты - глоссарий терминологии) |
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Spider and slips, английский
A gripping device used to grip and hold rods or casing while coupling or uncoupling them as they are being run into or pulled from a borehole. the device is essentially a heavy cast-steel circular ring called a spider in which the hole is tapered forming a surface against which four quarter-circle-wedge segments fit and slide. the inside faces of the wedge segments (slips) are serrated and shaped to fit snugly the outside of a drill rod or casing. when in use, any downward movement of the rod or casing causes the slips to wedge inside the tapered ring and grip the rod firmly; when the rods are moved upward the slips release. also called bowl and slips.
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Spider and slips, английский
A gripping device used to grip and hold rods or casing while coupling or uncoupling them as they are being run into or pulled from a borehole. the device is essentially a heavy cast-steel circular ring called a spider in which the hole is tapered forming a surface against which four quarter-circle-wedge segments fit and slide. the inside faces of the wedge segments (slips) are serrated and shaped to fit snugly the outside of a drill rod or casing. when in use, any downward movement of the rod or casing causes the slips to wedge inside the tapered ring and grip the rod firmly; when the rods are moved upward the slips release. also called bowl and slips.
Soft ground, английский
- A rock formation that can be drilled easily at a rapid rate of penetration or one that is friable.
- Rock around underground openings that caves easily and must be supported with heavy timbering.
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