Decanter centrifuges are specifically built for oilfield applications, both onshore and offshore drilling activities. Adjustable operating parameters enable the decanters to be employed for a wide range of solids control purposes in drilling fluid systems including: Barite recovery from the active mud system or from surplus mud in storage, separation of drilled solids from unweighted muds.

The decanter is equipped with a hydraulic Coupling and belt pulley for main drive and a belt pulley system for the back drive, discharge funnels for solids and liquid discharge as well as a gearbox overload switch, cover open switch and vibration switch.

In most cases Decanter centrifuges do a good job of separation without benefit of chemical additives. However, some fluids containing a high proportion of colloidal fines, e.g. in drilling waste applications, may need to be flocculated to make them separable. Flocculent chemicals are expensive, so it pays to exploit the other tuning capabilities of the Decanter to the full in order to minimize the dosage.
GN solids has varies of choices on decanter centrifuge from top notch material build to economic material build, from big bowl big volume to small bowl small volume, from fixed speed to variable speed.

500GPM Mud Drying System consists of two mud tank system Tank #1 and Tank #2. Tank #1 is to process the dirty mud with shale shakers and decanter centrifuge and clean mud will fall into the centrifuge compartment.Tank #2 is to store dirty mud and dry cuttings from shakers.

Procedure Description of Water Based Drilling Mud Drying System
1) Dirty drilling mud collected from drilling site being transferred to Compartment #4
2) Screen Separation by GNZS703 shale shaker
#2 GNSB6x5-12J (37kw) Centrifugal Pump transfers dirty mud to #1 GNZS703 shale shaker. The mud goes through screens and falls into compartment #1, drilled solids discharge directly into mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker.
Alternately, #2 GNSB6x5-12J (37kw) Centrifugal Pump can transfer the dirty mud to #2 GNZS703 shale shaker. The mud runs through screens and falls into compartment #1, and drilled solids are being conveyed by a GNSC180x2000 screw conveyor to mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker.

3) Centrifugal separation by GNLW363G decanting centrifuge.
#1 Slurry Pump 50YZ40-10 (5.5kw) feeds mud in compartment #1 to GNLW363G decanter centrifuge. After the centrifuge treatment, clean mud will fall into compartment # 2, discharging drilled solids out of Tank #1 and collected by cuttings collection box #1. #1 GNSB6x5-12J Centrifugal Pump suck the clean mud from compartment #2 and transfer it out for reuse.

4) Drilled Cuttings Drying by GNZS594 Hi-G Cuttings Dryer Shaker.
Drilled cuttings from screen surface of GNZS703 shale shakers will be discharged into mud feeder of GNZS594 Hi-G Cuttings Dryer Shaker. Dried solids discharges to Cuttings Collection Box #2 and a little mount of liquid falls into compartment # 3. When the compartment #3 is full, #2 Slurry Pump 50YZ20-18 (3kw) will transfer the mud back to the compartment #4 for recycling.

GN Skid-mounted mud handling system is a mud circulation system of mud configuration, purification and supply. It is specially designed and manufactured for oil gas drilling rig.Technological process description of every subsystem of oil gas drilling rig solids control system and installation, operation, maintenance and dismantling of the system will be provided.

This solids control system can handle the drilling mud by classification with mud mixing, weighting, shearing, agitating and at the same time supply mud to the well bore. The system consists of mud tank, elevated mud manifolds, mud distribution device (feeder); including five stage solids control equipment - shale shaker, degasser, desander, desilter and decanter centrifuge. It is a combination of mud gas separator, mud agitation system, mud pump suction system, mud mixing and weighting system, mechanical shearing system, mud gun line, clean water supply line (electric control system, lightning system) etc.

Oil gas drilling rig solids control system is a multifunctional design, therefore it can meet the requirements of various drilling depth and different types of drilling mud. Every subsystem and flow process can work separately or function as a whole.

Zero-Discharge System has became the trend of drilling waste management Dilled cuttings and the waste drilling water should be disposed in a safe way to avoid the harm to sensitive environment. This is crucial to oil based drilling mud. A set up of one zero-discharge system contains the following parts:

1. Linear motion shale shakers to separate the drilling cuttings of size over 200 mesh from the drilling mud. The solids off the shakers are discharged over a screw conveyor to transport them to vertical cuttings dryer.

2. Vertical cuttings dryer is used to recover the oil from the drilling cuttings. The centrifugal force inside the dryer allows the liquid portion of the feed pass through the cake bed of solids while the cake bed itself is continuously sent to the discharge at the outer diameter of the screen basket. The “dried” cuttings exit from the front of the machine where they are discharged to another screw conveyor for further handling and treatment. The recovered oil exists tangentially from the base of the unit into a holding tank.



3. Centrifugal pumps feed the desander cone and desilter cones of the mud cleaner. The overflow discharge and the screen undersize are sent to the next compartment on the mud tank system. The cuttings with size over 250 mesh discharged by the mud cleaner screen are sent to the cuttings dryer.



4. Progressive displacement pump (PDP) feeds the low-speed decanter centrifuge to recover the barite. The effluent is then fed to the high-speed decanter centrifuge to separate the colloidal particles from the drilling fluid. This fluid is mixed with the liquid from the cuttings dryer discharge.




5. The effluent from the high-speed centrifuge is mixed with the barite from the low-speed centrifuge and returned to the mud system with a centrifugal pump.

GN centrifuge provide you with efficient centrifugal separation technology both in the horizontal and vertical types of centrifuges.