Mud Tank

Introduction of Mud Tanks

Mud tanks are container, typically made of square steel tube and steel plate, to store drilling fluid on a drilling rig. Mud tanks play an important role in solids control system. It is the base of solids control equipments, and also the carrier of drilling fluids.

Mud tank is an important part in the solid control system.

Mud tank is a sizable storage container, typically with an open top. In the past, people called it a mud pit because it used to be just a pit dug out of the earth. It’s used to hold drilling mud.

Mud tanks are constructed from welded-up steel plates and tubes. The bottom of the tanks can either be square or cone-shaped. A tank can have several compartments.

Types of Mud Tanks

Based on functions, mud tank includes metering tank, circulating tank, chemical tank, aggravating tank, precipitating tank, storing tank, etc.

1. Metering tank is used for perfusion fluid metering.

2. Circulating tank is used in store normal operation of circulating drilling fluid during drilling process. Normally the shale shaker and vacuum degasser and desander are mounted together on the same circulating tank, while desilter and centrifuge on the second circulating tank.

3. In general, chemical tank's roof is mounted with shear pump. Chemical tanks are used for adding chemicals into drilling fluid.

4. Aggravating tank is used to configure weighted drilling fluid.

5. Reserve tank used for storing drilling fluid.

The role of mud tanks in solids control

Mud tanks play an important role in solids control systems. It is the basis of solids control equipment and the carrier of drilling fluid. The solids control equipment installed on the top of the mud tank includes:

Vibrating screen, vacuum degasser, desander, desilter, centrifuge, mud mixer, vertical slurry pump.

After returning to the well surface, the drilling fluid directly flows into the vibrating screen, the solids removed by the screen are discharged out of the tank, and the drilling fluid with less solid content flows into the mud tank through the screen for further purification. Centrifugal pumps draw the shaker-treated liquid into a desilter or mud cleaner for further purification. The mud pump is used to pump the drilling fluid into the centrifuge. The mud pump pumps the drilling fluid in the mud tank into the borehole after being processed by the centrifuge, and the circulation system continues to circulate.

The number of mud tanks required by a drilling rig depends on the depth of the well, as well as the drilling mud requirements. Typically, the shaker, vacuum degasser and desander are installed on the same mud tank as the first tank in the field, while the desilter and centrifuge are installed on the second tank.

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