The drilling mud circulation system plays the role of purifying and recovering circulating mud in the drilling rig. The mud circulation system can prepare mud suitable for drilling. It is mainly filtered through the first-level classification of solids control equipment such as shale shakers to filter the particles in the mud. 

The drilling mud circulation system is an important part of the drilling rig. The drilling mud circulation system includes: mud shale shaker, desander, desilter, decanter centrifuge, mud agitator, mud tank, jet mud mixer, sand pump, and vacuum degasser.

 The drilling mud circulation system is designed for different drilling conditions. Some drilling areas, such as Russia, require a mud circulation system that can withstand the cold; such as the middle east, where the temperature is very high, and the mud circulation system needs to be designed to withstand high temperatures. For example, for desert areas, the mud circulation system can be designed to prevent wind and sand erosion.

 Drilling mud circulation system for different types of drilling rigs is also divided into 1000HP drilling rig mud circulation system, suitable for drilling rigs with a drilling depth of 4 kilometers; 1500HP drilling rig mud circulation system, suitable for drilling rigs with a drilling depth of 5 kilometers; 2000HP drilling rig mud circulation system, suitable for drilling rig with drilling depth of 7 kilometers; mud circulation system of 3000HP drilling rig, suitable for drilling rig with drilling depth of 9 kilometers, etc.

 According to the drilling mud system, the drilling mud circulation system can be divided into: oil-based mud circulation system and water-based mud circulation system. The oil-based mud circulation system is mainly used in ultra-deep wells and directional well drilling. The water-based mud circulation system is mainly for shallow drilling that does not require high drilling mud.

 In short, the equipment composition and layout of the mud circulation system determine the role and classification of the mud circulation system. The drilling mud circulation system will continue to improve with the progress of drilling technology. More elements will be added to the drilling mud circulation system in the future.