Views:0 Author:Site Editor Publish Time: 2018-01-25 Origin:Site
1. Correctly choose coring methods and tools according to the geological conditions of each mine area, the physical and mechanical properties of rock and ore layers, and technical factors.
2. All kinds of special coring tools must be properly kept before use should be carefully checked, cleaned and inspected after each use, note lubricants.
3. Coring hard rock layers, diamond or carbide drilling should be used as far as possible.
4. In coring difficult drilling, should limit the speed, pressure and pump volume, proper control back to the footage length and time.
5. When drilling back into the footage shall not exceed the length of the core tube.
6. In the seam, the roof and floor of the seam and the important sign layer, rock, ore core did not take up, should make a special trip fishing, should not continue drilling, drilling must not exceed 0.5 meters. Fishing rocks, mining heart should try to use spray reverse, no pump or wire drill and other effective methods.
7. Carefully withdraw the core, as far as possible to avoid artificially broken, and strictly prevent rock, mine heart, the order reversed. Broken, soft ground drilling should be matched with three semi-combined pipe tools, hydraulic pressure relief method.