Drilling Mud Recycling System

GN designed 3 phase decanter centrifuge is mainly used for oil sludge treatment, slop oil treatment and other solids liquid liquid three phase separation, which consists of driving system, bowl assy, collection box, screw conveyor, centrifuge skid and VFD control panel.

The working principal of three phase decanter centrifuge is as below:
The 3 phase separation is based on different specific gravity and the difference should be obvious, , the solids, oil and water with different specific gravity, it is the basic pre-condition for performance well. With different specific gravity, the centrifugal force is different. The solids phase with large specific gravity and largest centrifugal force, the heavy liquid phase water with smaller specific gravity and smaller centrifugal force, the light liquid phase oil with smallest specific gravity and smallest centrifugal force. The centrifugal force becomes less from outside to inside and formed a solids layer and two liquid layers. The screw propeller is pushing the solids to small end solids discharge port, the 2 phase liquids are removed from heavy liquid outlet and light liquid outlet.
The bowl is made of duplex stainless steel SS2205, the screw conveyor material is also duplex stainless steel SS2205. The solids discharge port and liquid distribution nozzle are all protected by tungsten carbide insert. The screw conveyor is protected by tungsten carbide tiles and it is repairable. The main motor, back drive motor and pump motor 3 VFD drive installed inside the VFD control cabinet for frequency adjustment.
A pre-treatment equipment should be used to ensure the feeding material with solids content less than 10% and solids particle size should be smaller than 2mm. The 3 phase decanter centrifuge will be installed on top of mud tank. A separate bearing lubrication system is adopted for big model 3 phase decanter centrifuge, which will improve the working life of bearing.

Recently 3 units of GNZS595J shale shaker and 1 unit of GNZJ594J-3S16N mud cleaner with spill proof cover are ready for shipment to China drilling company.

GNZS595J-SHBJ linear motion shale shaker is special designed for offshore drilling rig, which with 5pcs shaker screen panels, dimension 585x1165mm, composite material frame shaker screen, total screen area is 3.4m2, the shaker deck can be adjusted from -1º to +5 º. 2ea of vibration motor drived the shale shaker and produce adjustable G force up to 7.5G. The shaker dimension is 3578 x 2020 x 1439mm. The vibration motor and starter are comply with ATEX explosion proof standard. The aluminum alloy explosion proof starter with protection grade of IP 56 or above. The shaker screens are fixed by ratchet wrench for fast screen replacement. The wear resistant polyurethane rubber strip with good sealing effect and long working life.
The GNZJ594J-3S16N mud cleaner with 1500gpm treating capacity, which consists of 3ea of 10 inch desander cone, 16ea of 4 inch desilter cone and bottom shale shaker. The shaker screen dimension is same with shale shaker 585 x1165mm. The spill proof cover are installed on top of shale shaker to avoid mud spill.

Centrifugal pump is used to feed drilling fluids to desander cone and desilter cone, GN centrifugal pump with hard ductile iron alloy wear resistant material pump casing and impeller, and the bearing is SKF brand for reliable operation.The wide open vane impeller produce lower axial and improve bearing life. All spare parts are interchangeable with international brand centrifugal pump for easy replacement.
Except for linear motion shale shaker and mud cleaner, GN can also produce vacuum degasser, decanter centrifuge, vertical cuttings dryer, mud tank, mud gas separator, mud agitator, mud gun, mixing hopper and various pumps etc. solids control equipments and drilling waste management equipments.

One unit of waste pit cleaning vacuum pump and decanter centrifuge are ready for shipment to Asia client. The working process is that the solids vacuum pump suck the waste sludge from waste pit, and dilute it with water and agitating, then the slurry is feed to decanter centrifuge for dewatering process. The mechanical separation of decanter centrifuge cut point is 2~5 microns, with chemical dosing unit, the separation performance will be improved.

For the waste sludge which with high solids content and high viscosity, it can not be treated by decanter centrifuge directly due to the limit of centrifuge feeding tube. The solids content should be reduced by dilution the sludge by water in the mud mixing tank, if necessary, heating process should be applied to reduce the viscosity.
The vacuum pump main components including tank and base assembly, lifting frame, slurry pipe assembly, suction pipe assy, inlet pipe assy, intake pipe assy, control panel assy, knife gate valve, pneumatic bufferfly valve, air discharge pipe assy, etc. The user will prepare for suction hose and discharge hose according to their suction distance and discharge distance, and also need an air compressor for air supply to solids vacuum pump. For more details of air compressor, pls contact with GN solids control. The user can select automatic motion or manual motion according to the material condition. Under automatic operation mode, the timer of suction and discharge can be set as per experience, the user can adjust it according to mud density, viscosity, suction and discharge distance.

The centrifuge feeding pump is installed on the mud mixing tank and feed the mixed slurry to decanter centrifuge, the progressive cavity pump is normally used as centrifuge feeding pump, for reliable operation and easily adjustment of feed rate, which can be controlled by decanter centrifuge VFD control panel.

Recently one set of Oil Contaminated Soil Washing and Separation Equipments are ready for shipment to Middle East customer. It is a customized system for Oil Contaminated Soil Washing and Separation, including the modular as below: for more details, pls check with GN solids sales.

1. Mobile washing module
2. Solids vacuum pump feeding module: including solids vacuum pump, air compressor module to supply air for the vacuum pump and decanter centrifuge VFD control panel, material suction pipe and discharge pipe, air supply pipe.
3. Pre-mixing tank 1: including electrical steam generator with water softening equipment, pre-mixing tank with liquid level meter, lightings, electric control system, heating pipeline and tank accessories, mud agitator for chemical mixing and agitating, submersible slurry pump to feed to screening shaker.
4. Pre-mixing tank 2: including electrical steam generator with water softening equipment, pre-mixing tank with liquid level meter, lightings, electric control system, heating pipeline and tank accessories, mud agitator for chemical mixing and agitating, submersible slurry pump to feed to screening shaker. One pre-mixing tank in use and one pre-mixing tank as back up. Since the electric steam generator can not provide enough steam for heating the oil sludge immediately, the 2 sets of pre-mixing tank design can improve the working efficiency of the Oil Contaminated Soil Washing and Separation system and it can work continuously. Heating process is important to reach the expected treatment result.
5. Screening module: including shale shaker, pre-mixing tank, mud agitator, decanter centrifuge feeding pump and static mixer.
6. Chemical dosing module for chemical preparation and mixing
7. Centrifuge separation modular: including VFD decanter centrifuge, 3 phase disc separator with its feeding pump, flushing unit, solids discharge transfer unit, centrifuge fluids collection tank with mud agitator, buffer oil tank and water tank, and electric control system, lightings, tank accessories.

Recently one set of 1000HP drilling rig solids control system is ready for shipment to Middle East. The solids control system consists of components as below:

1. Shaker tank : 2 set of GNZS594F-SHBF shale shaker with mud distribution box and solids discharge trough, 1 set of GNZJ594F-S3S16NF mud cleaner with desander cone and desilter cone feeding pump, 2 sets of mud agitator with helical bevel type gearbox, 4 sets of mud gun, lighting, the mud cleaner can be used as back up shale shaker. The shaker tank dimension is equivalent with 40ft container with liquid level meter, the walkway, guardrails can be foldable during transportation. The shaker screen size is 585x1165mm with composite material frame, stainless steel material wire mesh, and the shaker screen for shale shaker and mud cleaner is same.
2. Reserve tank 1: The storage tank dimension is same with 40ft container with liquid level meter, the painting color is customized as per client’s requirement. 3 sets of mud agitator, 3 sets of mud gun, lightings and guard room are installed on the tank
3. Reserve tank 2: the dimension is same with reserve tank 1, also with mud agitator, mud gun on the tank.
4. Pump skid: 2 sets of 75KW centrifugal pump as desander and desilter feeding pump, 2 sets of 75KW mixing pump, 2 sets of mixing hopper, powder collection hopper are all installed on the same skid and pipelines connected with solids control system.
5. Water tank with water transfer pump and lightings
6. Electric control system: including cables, control panel, distribution box for all the tanks control system. The whole system comply with ATEX explosion proof standard which can be used for offshore drilling rig.
   If you need a customized drilling rig solids control system, pls contact with GN solids sales.