Decanter centrifuge is used frequently to remove solids in oilfield drilling operation to achieve drilling fluids purification system. Decanter centrifuge, also called horizontal screw discharge sedimentation centrifuge, is the special solids control equipment to conduct solid/liquid separation. It is usually used as the forth stage equipment, the first is oilfield shale shaker, the second is desander, and the third is desilter. The desander and desilter can be combined as another equipment---mud cleaner. It can accomplish such procedures as feeding, centrifugal sedimentation, unloading, etc. Usually at least 2 sets of decanter centrifuge should be used for 1 drilling rig.

The first decanter centrifuge with middle speed was acted as the fourth phase solids control equipment. It is used for recovering barite which is an expensive material for drilling mud. A decanter centrifuge with good barite recovery can help reduce drilling cost and increase drilling efficiency.

The second generation of decanter centrifuge will be used for the treatment of the drilling cuttings. Usually, it is used downstream from vertical cuttings dryer after high G shaker for WBM. It is used to cover useful drilling mud from drilling cuttings.
 

It is mainly made from SS321 or SS316L, SS316 material. It contains a spiral propeller, whose blades are welded with wear-resisting tungsten carbide for effective extension of propeller’s lifespan. Its inwall consists of wear-resisting antiskid ribs to both protect rotary drum and increase discharging efficiency. The slag hole at its narrow end is coupled with outlet sleeves made from YG wear-resisting materials. On the surface of the narrow end is matched with several changeable and wearable liquid level board used to adjust the depth of liquid level.

We mainly purchase nation-renowned explosion-proof electric motors due to their ability to effectively ensure the power supply for drilling equipment, stability and safety.

It has a gear reducing structure. Its shell is connected to rotary drum. Its input shaft is linked to auxiliary electric motor via belt-pulley. When they work together, they will generate differential rotational speed to the propeller inside drum. Differential gear is the key part in centrifuge, primarily used for supply of large torque and constant differential rotational speed . Its three drive structures are planetary gear, cycloid pin gear and hydraulic gear.

Its outer shell is explosion-proof, adopting welded steel plate structure made up of socket and control chamber. Master electric motor cabinet contains such original parts as AC contactor and thermal relay so that the motor will be protected to the greatest degree once emergency occurs. Besides, we also provides explosion-proof frequency conversion control tank. It is a flexible hydraulic rotating device connected to master electric motor which thereby can start no-load centrifuge to reduce the starting current and protect the motor. If the load is too much, oil temperature inside will rise quickly above 120 degrees centigrade, oil will erupt via fusible plug, then the drive will be stopped and the motor and other components will be prevented from damage.

As a significant oilfield solids control equipment, drilling mud decanter centrifuge consists of a conical, horizontal steel bowl that rotates at high speed using a double screw type conveyor. The conveyor rotates in the same direction as the outer bowl, but at a slightly slower speed. It is mainly used for recycling barite, eliminating small solids, reducing the solid content of drilling fluids, controlling the density and viscosity of drilling fluids, ensuring the performance of drilling fluids, and it plays an important role in drilling fluids circulating system.