• Vibrating Mechanical drilling, in which the introduction of the drill string is carried out by vibrotechnika.

• Hydrodynamic drilling in which the rock is destroyed by the high-pressure fluid jet.

• Thermal drilling in which the rock is destroyed by the heat impact.

• Of electro drilling that destroys the rocks under the influence of forces arising from the electrical discharge.

• Explosion-drums drilling in which the rock disintegrates under the influence of forces generated in the explosion.

• Chemical drilling in which the rock destroyed by the action of reagents, entering it into a chemical reaction.

• With flushing drilling, in which the products of destruction of rocks are removed by the flow of washing fluid.

• With purge drilling, in which the products of destruction of rocks are removed by the gas flow.

Drill column.

Drill string is a lowered into the well the Assembly of drill pipes fastened together drill locks designed for hydraulic and mechanical energy to the bit, to produce axial load onto the drill bit and to control the trajectory of the well drilled.

Being together with the drill bit and a downhole motor drilling

tool, drill performs the following functions:

• transmits the rotation from the rotor to the drill bit;

• perceives from the downhole motor, the reactive moments;

• delivers to the bottom of the wash agent;

• brings hydraulic power to the bit and the submersible hydraulic engine;

• pushes the chisel in the rocks on the bottom, acting by its gravity (axial load on bit creates a part of heavy weight drill pipe (UBT), included as part of bottom hole Assembly (BHA), part heavy weight drill pipe (UBT) is used to tension the drill string.

• provides replacement bits and the submersible motor by moving them to the bottom or to the surface;

• allows emergency and other special operations in the wellbore.

Drilling rig.

A drilling rig is a machine that creates holes in the earth sub-surface. Drilling rigs can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells, or they can be small enough to be moved manually by one person and such are called augers. Drilling rigs can sample sub-surface mineral deposits, test rock, soil and groundwater physical properties, and also can be used to install sub-surface fabrications, such as underground utilities, instrumentation, tunnels or wells. Drilling rigs can be mobile equipment mounted on trucks, tracks or trailers, or more permanent land or marine-based structures (such as oil platforms, commonly called 'offshore oil rigs' even if they don't contain a drilling rig). The term "rig" therefore generally refers to the complex equipment that is used to penetrate the surface of the Earth's crust.

Small to medium-sized drilling rigs are mobile, such as those used in mineral exploration drilling, blast-hole, water wells and environmental investigations. Larger rigs are capable of drilling through thousands of metres of the Earth's crust, using large "mud pumps" to circulate drilling mud(slurry) through the drill bit and up the casing annulus, for cooling and removing the "cuttings" while a well is drilled. Hoists in the rig can lift hundreds of tons of pipe. Other equipment can force acid or sand into reservoirs to facilitate extraction of the oil or natural gas; and in remote locations there can be permanent living accommodation and catering for crews (which may be more than a hundred). Marine rigs may operate thousands of miles distant from the supply base with infrequent crew rotation or cycle.