drilling mud centrifuge

GNSX-450 is a three phase decanter centrifuge. The bowl size of GNSX-450 three phase decanter centrifuge is 450mm (18 inch) diameter by 1800mm in length. It is designed for 24 hours continuous and smooth operation throughout the day. It is mainly composed of driving system, decanter bowl, and screw conveyor inside the bowl, cover box, skid and VFD control panel.

Working principle of GN Solids Control 3 phase decanter centrifuge

GN Solids Control 3 phase decanter centrifuge is mainly designed and made for liquid, liquid and solids separation. GN Solids Control 3 phase decanter centrifuge can also be applied to two immiscible liquids with different specific gravities. When the solids and liquid mixture (raw material before separation) rotates into the high-speed rotating bowl internal the 3 phase decanter centrifuge, the solids and liquid mixture rotates synchronously with the drum. As the reason of the different specific gravity, the centrifugal force of the solids and different liquid is different.

The solid particles which with the larger specific gravity are subjected to the greatest centrifugal force, followed by the heavy phase liquid (such as water) and the light phase liquid (such as oil). So the centrifugal force is becoming less from outside to inside according to the magnitude of centrifugal force. A concentric solid layer and two liquid layers are formed.

The Solids phase inside the mixture will be pushed out by the conveyor impeller of the centrifuge bowl, and liquids are removed from their respective nozzles depending on different gravities. As the reason, GN Solids Control three-phase decanter centrifuge can not only separate the solid from the solids and liquid mixture, but also separate the two-phase liquid with different specific gravity in the liquid and liquid mixture. In this case, Solid / liquid / liquid separation can be achieved.

Besides 3-phase decanter centrifuge for oil field and non-oil field, GN Solids Control has other separation equipment to cater for different application, like shale shaker, mud cleaner, desander, desilter, degasser, transfer pumps, drilling waste management equipment, etc…

Screw pump is also called as Progressive Cavity Pump. A screw pump is a type of rotary pump which is equipped with rotor and stator. The rotor and stator is combined together and rotate within a cylindrical cavity or liner. The fluid or transfer medium enters from the suction side of the screw pump and moves linearly along these intermeshing screws / rotors to the discharge side of the pump.

Screw pump is a popular feeding pump type for centrifuge, no matter for decanter centrifuge, 3-phase centrifuge, or disc centrifuge. Besides screw pump, submersible slurry pump and sand pump are also been used a centrifuge feeding pump. But as submersible slurry pump and sand pump are both a kind of centrifugal force pump, they are not as good as screw pump to feed for decanter centrifuge.

Decanter centrifuge is a high speed rotating device. There will be many self-protection function for safety and also for protect the device. A major self-protection application is over-load protection. It means in case the centrifuge feeding is over load, the centrifuge will be stopped to avoid damaging bearings or damaging rotating component. In this case, the feeding screw pump must be capable to adjust the feeding flow. There are mainly 2 ways to control the feeding screw pump input flow rate:

1) If fixed speed screw pump is used to feed for decanter centrifuge, a VFD control panel is requested to adjust the feeding flow rate to avoid over load, and to reach the better separation performance.

2) If manual adjustable speed screw pump is used as decanter centrifuge feeding screw pump. Fix speed control panel can be used for the pump for start and stop.

Furthermore, as the decanter centrifuge has self-protection function in case of overload. To avoid damage the centrifuge, there must be an inter-lock connection between the centrifuge control and the feeding pump control. In case the centrifuge is stopped, feeding pump can be stopped immediately. And the screw pump cannot be started until the decanter centrifuge is running stably.

This is the last working week before Chinese Lunar New Year holiday, after that offices and workshops will be closed for a 2-week holiday. All GN workers are working day and night in order to ship as more as orders before the 2-week holiday.

Some dewatering centrifuge units are dispatched to sea port, they will be exported to a Southeast Asia client. The dewatering centrifuge units will be used for TBM mud treatment. TBM is short for Tunnel Boring Machine, it has a wide application in railway, hydropower, transportation, mining, municipal and other tunnel projects.

Drilling mud is used to lubricate drilling bits during Tunnel and Boring drilling activities. For environment protection, the drilling mud and waste water must be recycled and reused during and after the drilling activities. Besides normal mud desanding plant, dewatering centrifuge unit is also requested in some application to treat the waste water.

GN dewatering centrifuge unit consists of big bowl big ratio decanter centrifuge, and chemical dosing unit. The decanter centrifuge and chemical dosing system is combined as a full package unit to remove as more ultrafine solids as it can do. The decanter centrifuge and chemical dosing system are both allocated inside a fabricated container. The full package can be shipped as a shipper owner container during international shipment. And the containerized design can protect the centrifuge and chemical dosing system, which values much. And they are easy for shipment between different jobsites.

Decanter centrifuge itself is a Physical separation machine. It can only separate solids by particle sizes. It cannot remove ultrafine solids smaller than the cut point. By chemical dosing, the ultrafine solids can be flocculated, and reach the centrifuge cut point for solids removal.

Besides dewater centrifuge unit, GN Solids Control makes full line desanding separation equipment for TBM and other trenchless no dig activities, like shale shaker, desander, desilter, etc…

GN Solids Control 18 inch (450mm) diameter bowl decanter centrifuge is a big bowl centrifuge series. GN Solids Control 18 inch big bowl decanter centrifuge has 2 design options for different matrial separation request. The length over diameter ratio of GN 18 inch decanter centrifuge can be 3.4 : 1 or 4 : 1 for removal of low gravity solids from the liquid. And the big bowl centrifuge can reach a bigger capacity to reduce operating costs.

GN Solids Control 18 inch (450mm) diameter centrifuge is fitted with a 75hp main drive and a 30hp back-drive at one end for compact design. Depends on client’s selection The unit is optional to be fitted with main bearing temperature and vibration sensors. The optional sensors and functions give the GN 18 Inch Centrifuge improved standard on safety and performance monitoring features.

GNLW454EY is big bowl decanter centrifuge specially designed for waste water treatment. GNLW453 is also a big bowl decanter centrifuge. But unlike GNLW453 big bowl series decanter centrifuge, GNLW454EY is with a longer length and diameter ration to cater for waste water treatment requirements. And there are some other difference on the impeller and bowl design.

This week, 5 sets GNLW454EY big and long bowl Decanter Centrifuge was dispatched Tianjin sea port for departure to destination. T5 sets GNLW454EY big and long bowl Decanter Centrifuge will be used at a power plant to treat the waste water. The clients visited many centrifuge factories in China, and finally, they decided to buy from GN Solids Control. After months waiting, the 5 sets waste water treatment centrifuge is sailing for the client. Once the centrifuge arriving jobsite, GN Solids Control will send engineer to help for the first time commissioning and to train the operators.

Besides different models 18 inch big bowl centrifuge, GN Solids Control also makes small centrifuge from 9 inch, normal size 14inch, and bigger size 22inch and up to 30 inch bowl decanter centrifuge.

This week, a batch of solids control equipment was dispatched from GN Solids Control. The equipment will be used in Chinese rig site for a drilling rig mud circulation system.

It is a set of full package solids control mud processing equipment including below equipment:
1) 2 sets of linear motion shale shaker: GNZS703F. It is a 3-panel shale shaker for drilling mud pre-separation.
2) 1 set of desander mud cleaner, model GNZS752F-2S. The desander mud cleaner is equipped with a big under flow shale shaker the same model with first stage solids control shale shaker. It is easy for clients to stock spare parts and replacement screens for both shale shaker and mud cleaner.
3) 1 set of Desilter mud cleaner, model GNZS752F-12N. The desilter mud cleaner is equipped with the same under flow shale shaker with first stage solids control shale shaker and desander mud cleaner.
4) 2 sets of Decanter centrifuge, model GNLW452. It is a economic standard middle speed decanter centrifuge for barite recovery.
5) 2 sets of mud tanks.
6) 1 package of jet mud mixing system.

Besides the mentioned equipment, GN Solids Control is also capable to make drilling mud agitator, mud gun, centrifugal pump which are fully interchangeable with international popular brand, other VFD centrifuges, FHD decanter centrifuge, Vertical cuttings dryer, high G dryer, screw conveyor, and various model replacement shaker screens for different brand shaker models.

GN VFD decanter centrifuge is with advantages for self-protection and smart control.
The LPC program of GN hydraulic centrifuge is with below self-protection functions:
The start/stop of the hydraulic centrifuge and the start /stop of the centrifuge feed pump are logical connected for protection.
1. After start the centrifuge, only after the centrifuge bowl achieve the preset speed and running for some seconds, the feeding pump can be started for feeding mud.
2. When the decanter centrifuge is stopped, feeding pump cannot be started.
3. During the centrifuge running, the centrifuge will not be cut off if directly press the centrifuge stop button. Only by pressing the stop button of the feeding pump and stop the feeding pump, and then the centrifuge can be powered off.

A few weeks ago, GN Solids Control had a shipment for some solids control equipment to a client in Uzbekistan. Soon, the equipment will be used in extreme cold regions of Uzbekistan. The lowest ambient temperature in the area can be below minus 50 degrees Celsius.

This is not the first time that GN Solids Control has sent equipment to the extremely cold regions of the Commonwealth of Independent States (CIS).  4 years ago, in 2014, some package of drilling cuttings drying system was dispatch to Baker Hughes in Russian. The systems were running from 2014 till now. End users are very happy with GN products quality and GN services. Since they have other Chinese brand equipment in other jobsites, after comparison, end users said GN vertical cuttings dryer and decanter centrifuges are the best from China.

The solids control equipment will be used in clients’ drilling rig mud system for mud processing, the shipment is including following processing equipment:
1) Some linear motion shale shakers. It is the first stage solids control equipment in drilling rig mud system.
2)Some Mud cleaners. In rig mud system, mud cleaner is used after shale shaker. The desander can clean the mud to 50 microns, while the desilter separator can separate the drilling fluids to 27 microns.
3)Some Decanter centrifuge. There will be at least 2 sets decanter centrifuges in a complete drilling mud processing system. Firstly, a middle speed decanter centrifuge at 1800 rpm will be used to recovery the barite. After some circulation, there will be too much ultra fine solids inside the drilling mud, a high speed decanter centrifuge can be used to reduce the mud weight.

Furthermore, GN Solids Control is with rich experience to offer processing equipment for high temperature areas in Middle east and Africa, like in UAE, Kuwait, Iraq, Qatar, Yemen, Oman, Saudi, Algeria, Egypt, Ukraine, etc…In these areas, the highest temperature can up to +55 degrees Celsius. GN Solids Control is capable to make solids control and drilling waste management equipment for cold temperature areas to minus 50 degrees Celsius and to high temperature areas up to +55 degrees Celsius.

In past couple years, besides the petroleum industry, GN also tried expanding the business to some other fields. The big bowl decanter centrifuge and dosing system are two of the main equipment that widely used in environmental protection for waste water treatment. The decanter centrifuge is used to remove the solid particles in the waste water, used together with the dosing system; the treated water could be discharged directly with national standard for environmental protection.

GN Decanter Centrifuge

Dewatering Centrifuge

By now, GN has already developed he big bowl decanter centrifuge for dewatering process. A very popular model GNLW553 in GN’s production line is the unit with 22 inch bowl diameter. The bowl length is over 3 times of the diameter. This is not the largest model GN can make. In near future, GN’s decanter centrifuge especially used for water treatment will be released. The model series would be 454 and even 554.
GN’s decanter centrifuge is VFD available for main motor, back motor and the feeding pump. All the electric components used come from worldwide famous brand. Operator could set the RPM on the HMI panel and monitor the machine running conditions.

The dosing system is designed containerized with all the components are installed inside the container. GN has both 20 feet and 40 feet model. Clients could choose high configuration that including automatic dosing system and acid/alkali mixing tank or simple polymer mixing tank.
The cured flocculation polymer is fed to the waste water and then the ultra fine solids will be gathered to become large size blocks for easy separation by the centrifuge.

Polymer Dosing System

Dosing System

Features of GN Waste Water Decanter Centrifuge
1. Speed adjustable as per treated waste water condition
2. Humanized HMI operation for easy operation and reducing of manpower
3. Low consumption on polymer and energy comparing with filter press
4. Considerable protection for solids discharge port and scroll for longer lifetime

GN will release more models of decanter centrifuge for environmental protection waste water treatment. Any questions, please feel free to contact GN know.

GN now has over 30 high configuration decanter centrifuge stocked for urgent request and prompt delivery. The decanter centrifuge is normal type equipment used in the drilling fluids recycling system for fine solids separation. As a leading manufacturer of solids control equipment in China, GN always makes the inventory plan for the main equipment that most requested by the clients, like the shakers, decanter centrifuge etc.

What are the basic technical parameters of the decanter centrifuge
1. Size: 14 inch of bowl diameter, 50 inch of bowl length, this length and diameter ration is fine for most of the application
2. Treating Capacity: Max. capacity of 200 GPM with recommended capacity of 132 GPM
3. Speed: Designed Max. speed is up to 3900RPM with recommended normal working speed of 3200 RPM.
4. G Force: 2062 @ working speed 3200 RPM, under this speed, the solids with size larger than 5 microns could be removed out.
5. Gearbox: Torch of 3500 N•M, gear ration 57:1
6. Motor Power: Dual motors as main and auxiliary drive, 37 KW + 11 KW

gn-decanter-centrifuge-inventory

GN Decanter Centrifuge In Stock

What is the configuration the decanter centrifuge in stock
1. Material: Bowl is made of Duplex stainless steel 2205, screw propeller is from SS 316.
2. Bowl Fabrication: Centrifugal Casting technology ensures better material distribution to maximum avoid casting defects.
3. Protection: Screw propeller is protected by the tungsten carbide tiles with uniformly thickness of 4mm, much better than spraying welding 2mm uneven surface. Solid discharge ports are protected by ceramic lining for long life time and less maintenance. Collection box has air spring for easy open and damping close to protect operator.
4. Bear Brand: Genuine SKF bearing for longer and reliable operation
5. Control Panel: Both fixed speed and VFD panels are available as per customers’ requirements. Main electric components are from ABB, Siemens or Schneider.
6. Certificates: CE certificate for main machine, DNV lifting certificate for frame base, ATEX/ IEC Ex certified electric motors and panels are available hazardous area application.

Sufficient inventory is a guarantee for customers’ urgent request and prompt delivery. Now is near the end of the year, and GN is starting the customers profit surrender plan. Call GN no hesitation and you can get a special discount.

Drilling cuttings would be produced when drilling. In order to recover and reuse the drilling fluids, the operator need remove the drilling cutting from the drilling fluids. The well known equipment to remove the cutting from drilling fluids is the solids control equipment. So, what is the cuttings dewatering system? And how it works to remove the cuttings in the drilling fluids?

The drilling fluids with cuttings coming from the well hole is fed to the shale shaker unit via the elevated pipeline, this the method used in oil rig package. For some other drilling project, like the no-dig horizontal directional drilling, the used drilling fluids would be collected into a pit on the ground, and then the fluids would be transferred by a slurry pump to the shale shaker unit.

cutting-flocculation-polymer-dosing-system

Mud Dewatering

Shale shaker unit is the first stage for removing the coarse size cuttings in the drilling fluids. And then the de-sander and de-silter cyclone could remove out the cuttings with size down to around 20 microns. The used drilling fluids treated by the de-silter cyclone are already clean enough to be reused. However, the cuttings with size less than 20 microns would build up to make a heavy mud which is not suitable for normal drilling application.
The dewatering system is especially equipped to remove the ultra fine solids that even cannot be separated by the decanter centrifuge unit. A decanter centrifuge like GN’s 22 inch model GNLW553 can remove the cutting with size down to 5 microns. For the even finer cuttings, we need a flocculation process to gather the ultra fine solids so that the decanter centrifuge could remove out. The polymer mixing system is a critical part of the dewatering system, GN’s polymer mixing system is designed with powder hose conveyer, automatic dosing system, mixing tank and diaphragm pump for transferring the polymer to the drilling fluids. For better flocculation process, always one acid tank and one alkali tank is equip to make the suitable PH value.
Sometimes, the drilling fluids are mixture of water and oil, GN is also able to provide the oil water separator system for recovering the water and oil.
GN now has already have the design of the complete system for drilling cutting dewatering system, for more
information, please feel free to contact with us.

GN Solids Control is the 1st one manufacturer in China who ever sent the drilling cuttings solidification unit to client’s jobsite. It was predictable that many comments regarding the performance of GN solidification unit would come back. More important is how to response to these comments.
GN is always keeping developing new products, which is the reason of the first unit drilling cutting solidification unit coming from GN. Some of the comments on GN solidification unit are positive, while some are very good suggestions for GN to perfect the design. The unit sent to site was designed whole assembly installed on one skid, which makes the unit too long to move and locate the unit easily. The new design divides the machine into 2 parts; one is for solidification agent storage, the other part is for mixing. These 2 parts could be located more freely according to the site space. Comparing with old model, the new one has larger tank for agent storage, on top of the tank, hand rails are installed. The agent bag pallet could be put on top of the tank, which greatly increases the working efficiency. Though 2 parts, the whole system still could be put into one 40ft container for oversea transportation.

GN-drill-cutting-Solidification-unit

Cuttings Solidification Unit

The drilling cutting discharged out of the shale shaker and decanter centrifuge could be fed into the solidification unit for treatment. However, there is a misunderstanding on the performance of the solidification unit: No matter how wet the cutting is, so long it is fed into the solidification unit; the dry material will come out. This is not correct. The much wet the cutting is, the more solidification agent will be used. Hence, the operator should make the cutting as dry as possible before feeding into the solidification unit.
GN’s solidification unit was proved greatly saved the man power on site as it can working continuously, the speed could also be adjusted as per the working condition. Solidification unit is one of the final solutions for water base drilling cuttings. Easy operation and maintenance are its advantages.