What are some common types of drilling rigs used in well drilling trucks

There are a lots types of drilling rigs used in well drilling trucks, there are each suited for different drilling conditions and purposes. 

Here are some common types of drilling rigs:

1. Cable Tool Rigs: Also known as percussion rigs or spudder rigs, cable tool rigs use a heavy drill bit attached to a cable that repeatedly lifts and drops the bit to break through the ground. These rigs are commonly used for shallow water wells and are known for their simplicity and ability to handle various soil and rock formations.

2. Rotary Rigs: Rotary rigs utilize a rotating drill bit to cut through the ground. They employ a rotary table or top drive system to provide the rotational force. These rigs are versatile and can be used for both shallow and deep wells. They are commonly used in commercial and industrial applications.

3. Auger Rigs: Auger rigs use a helical screw-like drill bit, known as an auger, to excavate the ground. The auger is rotated into the ground, and the cuttings are lifted to the surface. These rigs are well-suited for drilling in softer soils and are often used for environmental and geotechnical drilling.

4. Air Rotary Rigs: Air rotary rigs utilize compressed air to operate the drilling process. The compressed air is pumped down the drill pipe, creating a high-velocity air stream that lifts the cuttings to the surface. These rigs are commonly used for drilling in hard rock formations and are capable of drilling deep water wells.

5. Mud Rotary Rigs: Mud rotary rigs use a drilling mud (a mixture of water, clay, and additives) to lubricate and cool the drill bit while also carrying the cuttings to the surface. The mud is circulated down the drill pipe and back up through the annular space. These rigs are often used for drilling in a wide range of formations, including clay, sand, and rock.