Underground drilling, the application of surface drilling techniques to drilling operations in tunnels. Its main purposes are: (1) to explore the structure of surrounding rock; (2) reveal the occurrence of the orebody; (3) advanced detection of groundwater and gas hazards in mining tunnels; (4) blind ore body was found; (5) to replace some exploration tunnels or guide the direction of tunnel heading, etc. The following is an introduction to underground drilling。
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Drilling pump - the "heart" of drilling construction
The development of underground drilling
Characteristics of underground drilling
The drilling pump was formerly called "mud pump". If the whole underground drilling is compared to human life activities, then the drilling pump is like the heart of a human being, which is the source of continuous circulation of drilling fluid from the ground to the bottom of the well, and then back to the ground from the bottom of the underground drilling. Drilling pump is an important part of drilling equipment. In the commonly used positive circulation drilling, it is to send the surface flushing medium - clean water, drilling fluid, or polymer flushing fluid under a certain pressure, through the high-pressure hose, tap, and the center hole of the drill pipe column, straight to the bottom of the drill bit, to cool the bit, remove the rock chips cut down and deliver them to the surface. The commonly used drilling pump is piston or plunger type, which is driven by the powerful engine to rotate the crankshaft of the pump, and the crankshaft then drives the piston or plunger to do reciprocating motion in the pump cylinder through the crosshead. Under the alternating action of the suction and discharge valves, the purpose of pressure and circulation of drilling fluid is realized. During the drilling process, if the drilling pump does not work properly, a downhole drilling accident will occur, just like the human heart stops beating. The classification of drilling pumps can be divided into single-acting drilling pumps and double-acting drilling pumps according to the form of action, and single-cylinder, double-cylinder, three-cylinder, and five-cylinder according to the number of cylinders.
Underground drilling construction is mostly shallow holes within 1000m, deep hole underground drilling has not become the main development demand; Because the construction area is wider and the personnel cost is high, foreign countries pay more attention to the equipment migration and adaptability. From the aspects of comprehensive construction cost control and drilling construction safety guarantee, more attention should be paid to the development of mechanization, program control technology, and safety and reliability in the drilling construction process. Based on the comprehensive economic analysis of underground drilling, combined with the breakthrough of bit metallurgy technology, new achievements of bit performance, such as suitable spectrum, high efficiency, and long life, have been obtained. To better serve geological and mineral exploration, the more accurate and easy-to-use core orientation and coring directional drilling technology has been developed according to the needs of geological research. At the same time, more porous integrated geophysical logging instruments are miniaturized, which provides a sharp tool to further meet the needs of geological exploration.
The characteristics of underground drilling are: (1) the underground tunnel space is small, often need to develop the underground drilling hole, in order to reduce the cost of underground drilling hole development, it is appropriate to use small volume, high degree of mechanization and automation underground drilling equipment, and the use of rope coring or hydraulic reverse circulation coring drilling process; (2) tunnel to drill in different azimuth and dip Angle of underground drilling, the drill to arbitrary Angle of the borehole (see figure gallery drilling a hole in the bedrock underground drilling, hole structure is simple, borehole diameter is small, the commonly used two kinds of aperture, geological prospecting exploration commonly used two aperture 46 mm and 59 mm, coalunderground drilling aperture slightly larger, commonly used two aperture of 75 mm and 91 mm; (4) underground drilling is limited by the working environment, the power of the drill is only suitable for electric hydraulic motor or compressed air drive, all the equipment should have waterproof, moisture-proof, fireproof, explosion-proof and leakage protection facilities.
It is the responsibility of each manufacturer to produce underground drilling that meets the standards Hambition mining conducts many tests on underground drillings for connection before they leave the factory, and the quality qualification rate is guaranteed. If you are in the underground drilling business, you can consider our cost-effective products.