drilling mud centrifuge

GN Solids Control just finished a job site training via internet for a client in South America. The training is for number 2 decanter centrifuge GNLW363C-VFD. Now the decanter centrifuge start to running well at rig site. It is a 14inch high speed decanter centrifuge with variable frequency drive (VFD) control panel. The 2 decanter centrifuges are used at the drilling rig mud system in South American.

GN Solids Control 14 inch decanter centrifuge is widely used for various applications. The decanter centrifuge can be used in oil and gas drilling solids control system, used in HDD mud recycling system, used in drilling waste management fine solids separation, used in slurry separation treatment, it can also be used in dewatering treatment system, etc…

GN Solids Control major business is for drilling mud solids control and drilling cuttings treatment. Most decanter centrifuge is designed for drilling mud solids control. GN Solids Control decanter centrifuge is designed and made for both drilling mud solids control and drilling waste management.

Unlike drilling mud treatment decanter centrifuge, drilling waste treatment centrifuge requests better wearing-resistance of the equipment. In this case, the centrifuge centrifuge and vertical cuttings dryer used for waste management must have high material standard:

1) The bearings brand of GN Solids Control decanter centrifuge is international leading brand SKF and FAG. As there are big bearings in the machines.

2) GN Solids Control decanter centrifuge bowl material is SS2304 Duplex made by centrifugal casting.

Besides offering variable speed variable frequency drive (VFD) control panel, GN Solids Control is also capable to offer fixed drive control panel, and full hydraulic drive (FHD) control panel for the 14inch high speed decanter centrifuge. For the fixed speed decanter centrifuge, GN Solids Control can also offer other sets of pulley and belt. The clients can change the pulley and belts to get another fixed speed. The optional speed is 3200rpm, 2800rpm and 1800rpm.

Besides the number 2 decanter centrifuge, there are 2 screw pumps which are used to feed for the 2 decanter centrifuge.

 

Centrifuge separator is a relative complex separation equipment. Centrifuge manufacturing have high request on production machines and the design ability of the companies. In this situation, few solids control manufacturer have the capability to design and make centrifuge separators. GN Solids Control is among the few companies who can make full line solids control equipment and drilling waste decanter centrifuge.

Besides solids control equipment, centrifuge is a major separation equipment designed and made by GN Solids Control. Besides the oil field decanter centrifuge to treat drilling fluids and drilling cuttings, oil field oil sludge, GN Solids Control also design and make 2-phase and 3-phase decanter centrifuge and disc centrifuge to treat sewage waste and industry waste water.

This week, GN Solids Control factory is working on the assembly and commissioning of a package of decanter centrifuge. The decanter centrifuge package is customized and made for chemical engineering projects for clients in China. It is a customized decanter centrifuge specially designed for chemical industry separation. The bowl design is much different with the oil field decanter centrifuge and sewage waste centrifuge.

It is a big bowl high speed decanter centrifuge equipped in the industry engineering project. The decanter centrifuge will be used to treat liquid chemicals. Besides oil industry separation and chemical engineering separation, GN Solids Control centrifuge can also be used in below applications:
1) GN Solids Control makes centrifuge separator for sludge dewatering, mud dewatering and suspensions.
2) GN Solids Control can design and make centrifuge to clarifying different types of liquids.
3) GN Solids Control can design and make centrifuge for sludge / mud thickening.
4) GN Solids Control designs and makes 3-phase decanter centrifuge / disc centrifuge to separate 3-hase mixtures, it is mainly two immiscible fluid phases and a solid phase. E.g.: oil, water and soil.
5) GN Solids Control designs and makes centrifuge to classifying solids in a wet suspensions to recover a certain size solids.
6) GN Solids Control designs and makes centrifuge for the separation of solids according to various densities

A customized drilling mud processing system is is ready for shipment at GN Solids Control Beijing factory. It mud cleaning system is composted of a mud cleaner, a mixing hopper, and a centrifugal pump for mud mixing and transfer.
The drilling mud cleaning and mixing system is designed and made by client’s request to suit his drilling mud situation. Normally, mud cleaner is equipped after a pre-seperation shale shaker. But in this mud cleaning system, the first separation equipment is mud cleaner.

Drilling Mud Cleaner

Drilling Mud Cleaner

The reason why the client do not use shale shaker is that, they said the solids content in the mud is not much high. And mostly are fine solids. In this case, the drilling mud can be separated by mud cleaner directly. It is to save cost. As once the shale shaker is running, clients need to replace shaker screen periodically. It is a continue cost for operation. While delete the shale shaker, the system can meet client’s request. It can save the cost of shale shaker, and furthermore, the can reduce wearing spare parts shaker screen cost.

But if the solids content is high, or the particle side is big, which is over the hydracyclone separation point and its mud handing capacity, it is better to use a shale shaker before the mud cleaner. At one hand, the shale shaker can reduce the flow rate which feed to the mud cleaner. At another hand, after the shale shaker separation, the solids content will be reduced, and the big size particle are total removed based on the shaker screen API size and cut point. It can increase the hydraucyclone separation efficient, and also to avoid the fast wear out the hydraucyclones. 10 inch desander cone and 4 inch desilter cone are the most popular cyclone sizes used for drilling fluids separation system. Operator can choose the to use only desander cone or desilter cone, or both based on the mud condition and their budgetary. Desander and / or desilter cone quality depends on the handling capacity of the whole system.

Drilling Mud Centrifuge

Drilling Mud Centrifuge

Feeding pump for mud cleaner is centrifugal pump. The centrifugal feed pump is located on tank slope for compact design and for maximize the total tank usable volume.

After the mud recycling and mixing system, a drilling mud decanter centrifuge is used for fine solids separation. As there will be more and more fine and ultra fine solids after some circulation of the system. Decanter centrifuge will be used to reduce the mud weight.

A set of GNMS-1000D mud recycling system and a 18 inch decanter centrifuge is ready for shipment. They will be shipped for a trenchless drilling project. GNMS-1000D is a Mud Treating & Recycling System. The mud cleaning system is designed and manufactured according to the needs and requirements of customers. GNMS-1000D mud recycling system is specially designed to treat the drilling mud in mining industry, piling machine, HDD (horizontal directional drilling) and other trenchless drilling activities. The treatment capacity of GNMS-1000D mud recyling system and cleaning system is up to 240m³/h.

1000GPM Mud Recycling Unit

A double deck shale shaker is used in the GNMS-1000D mud cleaning system. There are 2 sets of 10 inch desander cone assembly on top of the double deck shale shaker to use as a mud cleaner. The advantages of a single deck mud cleaner is that, it has the function of both shale shaker and cleaner and the footprint if small while with the compact design. The dirty mud will be fed to bottom shaker deck, which is mounted coarse shaker screen. The centrifugal pump is located on the tank slope to feed for the desander cleaner. Besides GNMS-1000D mud recycling system, GN Solids Control makes other capacity drilling mud cleaning system for trenchless drilling rigs: D Series Mud Recycling Models: 1) GNMS-200D mud cleaning system with handling Capacity: 200GPM, 50m3/h 2) GNMS-500D mud cleaning system with handling Capacity: 500GPM, 120m3/h 3) GNMS-1000D mud cleaning system with handling Capacity: 1000GPM, 240m3/h 4) Other models can be customized according to clients special request. GNLW452 is an economic standard decanter centrifuge. It is a 18 inch big bowl centrifuge. But the bowl diameter and bowl length ration is only 2. And the max. Bowl speed of the GNLW452 centrifuge is 2200RPM. It is a single motor decanter centrifuge with fixed speed control. VFD control is available if requested by clients. The centrifuge is widely used for trenchless drilling mud treatment, and oil & gas drilling mud barite recovery.

GN Solids Control waste management decanter centrifuge is specially designed for drilling cuttings and various waste material. It is widely used after high G drying shaker, Vertical cuttings dryer for drilling cuttings treatment. Or used together with chemical dosing system for dewatering treatment.
Compare with normal decanter centrifuge in China or from U.S, Europe, GN Solids Control decanter centrifuges have below advantages.

GN decanter centrifuge is made per international high standard specially designed for drill cuttings and waste management. Below are some necessary features. It is much more durable than economic standard. :

GN decanter centrifuge Bowl material is Duplex Stainless Steel 2304 and by centrifugal casting; While other Chinese brand or even U.S brand are normal SS304 or SS316 made by casting. GN material grade and processing technology are both better. It ensures a better dynamic balancing during high speed operation. So GN waste decanter centrifuge has less vibration compared with other brand centrifuges at the same working situation.

GN decanter centrifuge Screw Protection is Tungsten Carbide Tiles. It can last for longer life and is easier for replacement;

GN decanter centrifuge Solids Discharge is 360° type with wear protection with 6 fully covered tungsten carbide discharge wear liners. And it is interchangeable.

GN decanter centrifuge Liquid Discharge port is protected by adjustable Weir Plates. Operators can adjust the wetness per material situation.

All Bearings used in GN decanter centrifuges are from international top brand: Original SKF or FAG.

GN Solids Control special designed mobile skid is heavy duty telescopic skid with operation height 2800m, or 4100 per clients request. Both the feeding screw pump and VFD control panel can be mounted on the skid for easy movement. There are foldable walkways and guardrails make the skid easy for movement and easy for job site layout. And it is safe and convenience for operator to go up and down to check and centrifuge operation. Clients likes GN design much.

GN Solids Control made a small liquid and solids separation system. The small system is customized for an Europe company per clients request. The client asked for a small recycling unit with cleaning capacity of about 12-15 m³ / hour. The client wants a small single centrifuge in the small recycling system.

GN Solids Control customized a compact system which is composed of a small size shale shaker and a mini size decanter centrifuge. The shale shaker and decanter centrifuge are located on a mud tank together with a centrifuge feeding pump and electric control cabinet for the whole system. Tank size for the whole system is 3900Lx2250Wx1300H (mm) for easy movement. It is a small capacity recycling system with turn-key solution. All connections inside the system are included.

The Shale shaker separator model is GNZS752F-MDZF. It is a 2-panel small size shale shaker with small footprint.

The Decanter centrifuge model is GNLW223D-VFD. It is a 9” baby centrifuge for fine solids separation. The Cut point of GNLW223D-VFD centrifuge is 2 ~ 5 microns.

The color, brand and logo are all customized per client’s request. GN Solids Control is capable to make other customized system per clients job site situation. Clients can contact GN Solids Control sales engineer to get customized solutions.

Besides the small mud recycling system, GN Solids Control makes various sizes of Mud Recycling System for HDD, water well drilling, Trenchless, Piling and TBM activities.

The major applications of GN mud recycling system covers below field, but not only limited to below:
1) Trenchless HDD Project
2) Bored Pile Project
3) Micro TBM (Tunnel Boring Machine)
4) Diamond Drilling, Water Well Drilling etc

Below are some Mud Recycling desanding plant Models GN can make:
D Series Mud Recycling Models:
1)GNMS-200D Capacity: 200GPM, 50m3/h
2)GNMS-500D Capacity: 500GPM, 120m3/h
3)GNMS-1000D Capacity: 1000GPM, 240m3/h
4)Other models should be customized per clients’ request

Many clients do not know how to choose the right model solids control and drilling waste management equipment to suit for their projects. Below are some comments and suggests from GN Solids Control to help clients make decision. For more assistance, clients can contact GN Solids sales engineers.

1. Shaker screen. To ensure accurate cut point, clients must to choose replacement shaker screens which are confirmed to API RP13C. In order choose the right model replacement shaker screen, firstly clients need to confirmed the shaker model, once shaker model confirmed, screen size is known. And then based on the requested separation point to choose right API size. For different brand replacement shaker screen, the same API size screens are interchangeable.

2. High speed Decanter Centrifuge or low speed decanter centrifuge Package complete with feed pump, connection hoses and control panels.
GNLW363C fixed speed centrifuge is recommended as high speed and low speed operation. It is the most popular size 14 inch decanter centrifuge. Operators can change pulley and belt to get another fixed speed.
Fixed speed centrifuge is easy for operation and maintenance, and its cost is much lower than VFD centrifuge or FHD centrifuge.

3. Screw conveyor Auger transfer for drilling cuttings
GN Solids Control makes screw conveyor with auger diameter vary from 10″ 12’’ 14’’, 16’’ and 18’’. The auger body is equipped with grab wire for emergency stop.
Suggest clients to choose a size auger to min. spare parts stock.
GN augers are combined by standard length 12ft per section. 14” dia. with 36ft transfer length is recommended. You can remove the middle section to use it as 24ft, or add another middle section to use as 48ft.

4. Sludge transfer pump
GN Solids control have various types transfer pump. Clients should tell GN Solids Solids Control their request for model selection, like what is the material for transfer, mud, cuttings, solids, or others? What is the transfer capacity want to reach? What is the transfer length? GN Solids Control has submersible slurry pump, and vacuum pump for solids and sludge transfer, it is driven by air. Users should offer air supplier. It can be supplied by air compressor, or supply air from the rig site. GN Solids Control also makes centrifugal pump.

GN Solids Control makes different sizes mud recycling and mud mixing system for HDD rigs, water well drilling rigs, etc… The popular size includes but not limited to 150GPM, 200GPM, 350GPM, 500GPM, 600GPM, 750GPM, 1000GPM, etc…

GN Solids Control makes different sizes and customized design mud recycling and mud mixing system to suit for clients request.

For example, a client contact GN to inquire a customized water well drilling mud cycling system for 500GPM ~ 1000GPM. The client want a customized mud recycling system equipped with 2 shale shakers, 2 desander mud cleaners, 1 desilter mud cleaner, 1 middle speed decanter centrifuge and the system should be complied with a mixing hopper and mixing pump unit.

The client wants both shale shakers and both desander mud cleaners should have the possibilty to use only one of them if client drill smaller borehole and uses smaller mud pump. GN Solids Control will equip valves at shale shaker distribution pipelines and desander inlet pipes to control the feeding. Clients can choose to use both or either.

2 shale shakers, 2 desanders, 1 desilter and centrifuge feed pump are located on #1 tank.
#1 mud tank will be divided into 3 compartments:
1.1 Both shale shakers feed the first tank.
1.2 Both desander mud cleaners feed the second tank.
1.3 Desilter mud cleaner will feed third tank. It is clean mud tank, Centrifuge feed pump sucks from desilter tank.

Decanter centrifuge, mixing hopper and mixing pump are located on the #2 mud tank.
#2 mud tank (for clean mud) will be divided in to 3 compartments:
2.1 decanter centrifuge tank, which suck mud from 1.3 desilter tank and feed the tank under it.
2.2 clean mud storage tank
2.3 mixing tank with hopper and mixing pump

Mud Agitators and feeding and transfer pumps will be located per needed and per payout.
Third pass to forth via liquid level height.

GN Solids Control is a professional manufacturer to make different sizes Solids Removal Variable Speed Centrifuge includes stand, feed pump and connecting hoses, and other processing equipment and accessory processing equipment before and after decanter centrifuge.

GN Solids Control makes Variable speed from 0 up to 4,000 RPM per different models. GN Solids Control is capacity to make both VFD control decanter centrifuge and full hydraulic drive (FHD) decanter centrifuge per meet clients’ request.
GN Solids Control brand decanter centrifuge is designed with high G-force to get a better separation performance.

GN Solids Control has big bowl decanter centrifuge vary from 18 inch to 22 inch, and max. to 30 inch for big fluid processing rate. In the world, few companies have the capability to make big bowl decanter centrifuge up to 30 inch. GN Solids Control is one of them who have the abilities.
GNLW553 VFD decanter centrifuge is a 22 inch bowl decanter.
GNLW453 VFD decanter centrifuge is a 18 inch decanter.
GNLW363 VFD decanter centrifuge is a 14 inch decanter.
Roughly, for the same conditions, 1 set 22inch decanter = 2 x 14 inch decanter centrifuge.

And 1 set 18 inch decanter = 1.4 x 14 inch decanter. The operators cannot expect to use an 18 inch decanter centrifuge to replace 2 x 14 inch decanter or to replace a 22 inch decanter.

GN Solids Control 14 inch, 18 inch and 22 inch decanter centrifuge can all be used for heavy mud solids control. And also some clients want to use the decanter centrifuge for different applications like for barite recovery, HGS (high gravity solids), LGS (low gravity solids), waste management, and dewatering treatment, or other different applications, the centrifuge features are not all the same. When GN Solids Control makes the design for standard models, GN Solids Control need to balance the performance for all the situations. If clients have fixed applications with the centrifuge, suggest clients to share the information to GN Solids Control sales engineer before order to get and best solution to suit for the projects and maximized the separation performance.

 

GNLW363 FHD centrifuge is a Full Hydraulic Drive decanter centrifuge. It is designed to remove low specific gravity solids from slurries. After the FHD centrifuge separation, the solids are removed and the liquid is returned for recirculation. Like in the drilling mud system, the recovered slurry is drilling fluids, it can be reused in drilling mud system, in waste water treatment system, the recovered slurry is water, which can be reused in the waste water treatment plant. And in some cases, like in the barite recovery treatment, the solids are returned to the active system and the liquid is discarded, or goes to further treatment processing.

GNLW363C-FHD decanter centrifuge is fully hydraulic drive. Th Full hydraulic driven system is imported from leading brand from Switzerland. The bowl speed and conveyer speed of GN FHD decanter centrifuge is adjustable within the permitted range. It can achieve independent, step-less and large-range speed regulation for the bowl and conveying. The bowl speed and conveyer speed during working is showing on the screen.

The advantage of the full hydraulic drive centrifuge is for use in high temperature ambient for heavy mud with flexible bowl and differential speed. The compact one skid design makes it easier for rig up.

GN FHD decanter centrifuge is composed of bowl assembly, collection box, hydraulic drive system, electrical control panel, drive motor, vibration switch (optional), case, base assembly, and skid.

During decanter centrifuge operation, drilling mud or slurry is pumped through the feed tube into the center of the rotating conveyor, where it splashes against the feed accelerator. Screw pump is widely used as feeding pump for decanter centrifuge, besides screw pump, centrifugal pump and submers. The high velocity slurry is then dispersed out four feed nozzles mounted in the periphery of the conveyor cylinder. Rotating at a higher speed than the conveyor, the bowl creates an additional shearing effect, which further increases the slurry’s acceleration. The depth of the slurry in the bowl (pond depth) is determined by the setting of weirs on the liquid bowl head (large end of the bowl).