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(1) to obtain first-hand underground geological physical data, that is, from the borehole to remove core, core, cuttings or liquid, gas samples, if necessary from the hole wall supplement wall rock sample ore samples;

(2) as a geophysical logging channel to obtain various geophysical information of rock and ore layers;

(3) as an artificial channel to observe the hydrogeological dynamics of underground water layer;

(4) some drilling can combine exploration and exploitation, exploitation of groundwater, geothermal, oil and gas.

Drilling projects have been widely used in many sectors of the national economy, according to the purpose, drilling can be divided into the following categories:

(1) geological survey or exploration drilling, used to understand the geological structure, prospecting or proved mineral reserves;

(2) hydrogeological drilling, survey of underground hydrogeological conditions;

(3) Wells, for industry, agriculture, national defense and life to develop and use or recharge groundwater resources and enrich the role of hydrogeological data;

(4) engineering geological drilling, survey or for the construction plant foundation, dam site, reservoir, bridge and road, and other exploration of the engineering foundation;

(5) oil drilling, exploration and development of oil and gas;

（6） geothermal drilling, exploration and development of underground hot water and steam resources;

（7) drilling for the construction of engineering foundation; drilling for the construction of foundation pile or pipe pile used for the reinforcement of the construction of engineering foundation;

We have developed drilling to exploit underground brine, dissolve rock salt, sulfur, and burn and gasify underground coal.

(9) auxiliary drilling for mining or tunnel engineering, drilling for ventilation, drainage, water and gas exploration, freezing, transportation, construction and communication installation pipeline, blasting, sampling, grouting and other construction when mining or tunnel construction.