GN Solids Control makes different sizes mobile Dewatering unit. It is full package dewatering decanter centrifuge unit, which is complete with its own mixing, dosing and monitoring system.

The Dewatering Unit can be containerized, self-contained with all required equipment and suitable for offshore and onshore rigs. The objective of Dewatering Unit shall be to reduce liquid waste volume in such locations.

The Dewatering Unit can provide chemically and /or mechanically enhanced treatment of wastewater based drilling fluids using flocculation and coagulation methods of separating solids up to colloidal size for disposal and recycling the fluid for preparing new drilling fluid volume.

The Dewatering unit shall have fluid processing capacity such that it is able to effectively and efficiently process waste 10 ppg waste water based drilling fluid containing minimum 10% (v/v) solid particles of particle sizes ranging from 200 microns to <1 micron. The mud handle capacity depends on the decanter centrifuge bowl size.

The waste drilling fluids will be bentonite based fluid or polymer based fluid containing all chemicals normally used in drilling fluids, including but not limited to, barite, bentonite, calcium carbonate, marble, xanthan gum polymer, drilling starch, modified starch, polyanionic cellulose, acrylamide polymers, polyamine, latex polymers, sulphonated asphalt, ester based lubricants, phosphate based lubricants, graphite, cellulose fibers, sodium chloride, sodium bromide, potassiumchloride, calcium chloride, calcium bromide, sodium hydroxide, sodium carbonate, sodium bicarbonate, magnesium oxide, citric acid, defoamers, zinc carbonate, sodium sulphite, ammonium bisulphite, amine corrosion inhibitors, biocides, lime, etc. each in various concentrations as required by COMPANY’s drilling program.

The waste drilling fluid will also have formation-drilled solids predominantly from clay, shale, limestone and dolomite formations, formation oil traces, scale, etc…

The Dewatering unit includes all necessary pipes, hoses, tanks, vessels, valves, connectors, fittings, adapters, sampling points, flushing system, cooling system, electrical system, cables, protectors, control system and safety system (level, pressure, temperature, torque, emergency stop, system protection, etc.), spares, etc. The electrical system can be non-explosion proof for safety ares. It can also be Zone 1 which is suitable and safe for drilling rig’s zonal requirements.

The decantering decanter canl be fully operational on a continuous basis. The ambient temperature can up to + 55° C

screw conveyor is the most popular transfer device for drilling cuttings transfer at oil and gas drilling rigs. There are many types of screw conveyor, but U- type is most common type for oil and gas drillings application. GN Solids Control can make fixed speed screw conveyor and manual adjustable speed screw conveyor.

Furthermore, GN Solids Control can also make VFD control panel for fixed speed screw conveyor. The explosion proof standard can be fully CNEX, IECEx or ATEX Zone 1 and Zone 2 Rated and suits for 460V/60HZ 3 Phase, 480V/60HZ 3 Phase, 380V/HZ 3 Phase, or suits for customized power system. Clients confirm voltage and HZ before order.

GN Solids Control makes screw conveyor with auger diameter vary from 10 inch to 18 inch (10 inch, 12 inch, 14 inch, 16 inch and 18 inch). And the screw conveyor length can vary from 12 ft to 48ft (12 ft, 24 ft, 36 ft and 48 ft) as standard model. Each auger are combined with standard length of 12ft per section. For other customized diameter and transfer length, clients can contact GN Solids Control for customization.

As screw conveyor is rotation equipment, there must be necessary safety protections to meet HSE standard and to protect job site operators.

Firstly, the top of screw conveyor will be covered and sealed by metal plate or by gratings. From one hand, it can prevent big matters fall down inside the screw conveyor which may broke the auger impellers. Secondly, it can protect people figure or foot from touch the screw conveyor while the auger rotation.

Secondly, GN Solids Control can equip Safety Grab Wires all long the auger length and ESD Devices (emergency stop device) to start and stop the control panel in case of emergency.

GN Solids Contol can offer Audio / visual alarm system on auger control panel which will be automatically activated once the power is switched on followed by the actual auger startup with a safety delay time. Audio / visual alarm system to be in the OFF mode after some time once the auger starts operation.


GN Solids Control can design and make waste water treatment systems. Oil water separator unit can be used together with inclined plate clarifier. The function is to settle down small content of soil and sands, separate oil and water for recycling and reuse. It can be used to replace skimmer on the oil field.

For example, GN oil water separators can “Run-off” water from the rig activities is directed by the rig drains and collected in the concrete pit under shale shaker. The contaminated water generated from the activities is then pumped into the skimmer tank or inclined plate clarifier (ICP) by using the vacuum sludge pump or diaphragm pump to facilitate the separation process by gravity between the water and any free oil contaminate.

There are many inclined plates inside the inclined plate clarifier (ICP) which increase the settlement area, accelerate the settle down of soil inside the oil slurry mixture liquid, and increase the waste water discharge capacity. Liquid will flow to oil water separator device next to the ICP for getting oil and water. There is a small auger and a small diaphragm pump underneath the inclined plate clarifier (ICP) to clean out the settle down soil at the tank bottom periodically.

Once the process has been completed, the oil is transferred to the oil tank in the oil water separator skid, likewise for the clean water which goes to water tank on the same skid; the separated oil and water are then pumped into the other oil or water tanks at rig sites or at job sites. There are level gauge with its control on oil tank and water tank for high / low level control. When the level is high, the gauge control will start the pump to transfer the oil / water outside. When the level is low, the gauge control will stop the pump.

The capacity of GN waste water treatment unit is 50 m3 per hour.
Finally, the water and oil are ready to be reused back into the mud and rig operations (cleaning, dilution, mixing, etc)

Decanter centrifuge is used to treat oil slurry, waste water and drilling mud of drilling field. It utilizes centrifugal force to separate fine solids from slurry and water mixture. It is precision separation equipment for solids control mud system at oil and gas drilling rigs. It is used after solids control equipment. After the drilling mud treated by shale shaker, desander, desilter, or mud cleaner, the recovered mud will be pumped to decanter centrifuge for precision separation. The decanter centrifuge can be used to recover barite for reuse, or to remove the ultrafine solids from drilling fluids to reduce the mud weight, to make the drilling qualified for drilling activity.

When the slurry or drilling mud is fed to FHD decanter centrifuge internal bowl, the slurry flows in the channels between the conveyor’s flights, the heavy particles settle at an accelerated rate due to the centrifugal force generated by the rotating bowl. Sand particles settle almost instantly; then the finer, lighter particles settle. Particles that cannot be settled under the present centrifuge settings will be discharged with the liquid through the adjustable weirs on the liquid bowl head. Liquid exiting the liquid bowl head is directed through the liquid discharge outlet.

The settled solids form a cake on the inside of the bowl and are transported by the conveyor toward the narrow end of the bowl, or beach. As the solids travel across the beach, their free liquid film is lost due to centrifugal squeezing and drainage. When they are discharged at high velocity through the solids discharge ports on the bowl, they contain only the adsorbed moisture.

Since the discharge cake is very heavy and sticky due to the lack of free liquid, the centrifuge should be installed over the receptacle that is to receive the discharged solids. If this is not possible a slide or chute is needed to convey the solids. A steep angle is required to ensure self-cleaning, or a wash system must be provided to prevent material buildup.

The coronavirus situation hit the whole world greatly since months ago. More and more countries and people involved in. The virus let us know, all people in the world are bonded, we are a whole unit, no one can exist without consider others.
China, as the first country to aware the serious of the virus and the first one to fight against the virus, got great help from many countries and worldwide people. We get many kinds of material from China and outside of China to help us bit the virus soon. The virus situation in China got into control since March. And people life and factories get recovered. A friend in need is a friend indeed. Now it is time for Chinese people to help others.

Face mask is approved to be a good way for protection when people go outside of home. But mace masks are short of storage in many countries, it is difficult to buy it. GN Solids Control bought some medical surgical face mask. For any friends or clients from GN Solids Control, if you need medical surgical face mask, please send you request and information to GN Solids Control for arrangement. GN Solids Control will arrange the delivery soon once get your request.

For people outside of China, you can send your mask reservation to sales@gnsolidscontrol.com
If you are stay in China, you can send your mask reservation to sales@gngukong.com

Besides wearing face mask, below actions is also suggested to be useful to fighting against the Virus:
1) Try to stay at home. Do not go out wide more than 2 persons.
2) Wash your hands as often as you can. Because you do not know when and where you may touch something which is not clean or have been polluted by virus.
3) Avoid touching other people. Keep at least 1.5m with other people.

GNLW363 FHD centrifuge is designed expressly for removing low specific gravity solids from slurries and drilling fluids. In one type of processing, solids are removed and the liquid is returned for recirculation. Alternatively, solids are returned to the active system and the liquid is discarded.

GNLW363C-FHD decanter centrifuge is fully hydraulic drive. The bowl speed and conveyer speed 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 mechanical operation principle of a full hydraulic  drive decanter centrifuge is as below:

  1. The centrifuge employs centrifugal force produced by the high-speed rotation of a cylindrical bowl to separate solids from slurry. Centrifuge performance is based on three variable factors:
  2. Force exerted on the fluid – Centrifugal force pulling fluid against the outside wall of the Centrifuge
  3. Retention time in the centrifuge – The longer the slurry remains in the centrifuge the smaller the particle that can be separated
  4. Differential speed of conveyor – The faster the conveyor rotates the wetter the solids

All three factors may be manipulated in GNLW363C-FHD centrifuge to alter the liquid and solids discharge. The centrifugal force is adjusted by varying the bowl RPM. Retention time is controlled by adjusting the liquid discharge ports on the liquid bowl head to vary the pond depth (depth of liquid remaining in the bowl), and the feed rate to the unit (the lower the feed rate, the higher the retention time).

The conveyor operates at a slightly lower speed than the bowl. The conveying speed is the difference between the bowl and conveyor speeds. During decanter centrifuge operation, the CONVEYOR SPEED indicator on the hydraulic control panel displays the number of conveyor RPM less than the current bowl RPM. For example, a displayed conveyor speed of 30 with a bowl speed of 2000 RPM translates into a conveyor speed of 1970 RPM.
Other than pond depth, all other parameters may be changed quickly and easily to adjust the equipment for optimum efficiency in response to varying the feed conditions. For best performance, the slurry should be screened to 74 microns in vibrating screening machines before passing to the centrifuge for processing.

During the last week of golden September, the government is business for the preparation of the mega even: Military Parade and celebration for 70’s Birthday of China. And GN Solids Control is busy on equipment delivery every day. Most products are for international clients to let world know more about MADE IN CHINA.

One of the shipments is high speed decanter centrifuges and centrifugal pumps for Russia client for oil field application.
The 2 sets of high speed decanter centrifuge are GN 14 inch (360mm) diameter bowl decanter centrifuge which has a length over diameter ratio of 3.5:1. The decanter centrifuge is with high speed up to 4000 RPM. The bowl of the decanter centrifuge is made from centrifugally casted duplex stainless steel. The impeller of the centrifuge bowl is protected by tungsten carbide hardened tiles to maximize the GNLW363 centrifuges operational service life between overhauls. Furthermore, the centrifuge is equipped with replaceable tungsten carbide inserts at the feed distribution and solids discharge zones for long lifetime and easy maintenance. The unit also has Tungsten Carbide plows to continuously clear the solids discharge area. All bearings fitted to the GNLW363 centrifuge are SKF premium brand bearings for longer life time and reliable operation.

There are many centrifugal pumps in the shipment. Compared with other Chinese pump suppliers, GN Solids Control centrifugal pump is with below advantages:
1) GN centrifugal pumps are fully interchangeable with a popular old brand. All the sizes and spare parts are all interchangeable. It helps clients to replace the pump easy. And it also helps clients to source and stock spare parts easily.
2) GN centrifugal pump casing and pump impeller are made from hard ductile alloy. The higher standard material increase abrasion resistant capability of GN pump compared to competitors pump.
3) All bearings of GN centrifugal pumps are from top brand for reliable performance.
4) The skid for holding the pump and motor is made from casting instead of welding to provide reliable operation and less vibration in a result to extend the pump and motor life.

Besides centrifugal pump, GN Solids Control makes other kinds of pumps for various applications. Below are some of GN made pumps:
1) Solids and sludge transfer vacuum pump
2) Submersible slurry pump
3) Mud shearing and mixing pump

A batch of drilling mud shale shaker are ready for shipment. The shale shaker will be dispatched to Tianjin sea port for sailing to Indonesia client in the coming days.

Vibrating Shale shaker is one of the main processing equipment of drilling mud solid control system for oil and gas drilling rigs. It is a repeated order the Indonesia client giving to GN Solid Control. Before this order, the client is already has many GN Solids Control mud processing equipment running at his rig site. They are happy with GN Solids Control equipment performance and GN services, and repeated order to GN Solids Control once they got new projects and have demands for new mud processing equipment.

Shale shaker is the first stage solids control equipment of mud purification and separation in the drilling mud system, its importance is self-evident. The performance of drilling mud solids control shale shaker will determine the mud purification performance of the whole solid control system to a great extent, and it is importance to the drilling activities.

Advantages of GN Solids Control shale shaker:
1) Patent design shale shaker deck angle jacking system. It can be adjusted while the shaker is working. The jacking system is mechanical deck angle adjustment with reliable performance.
2) Patent rubber sealing design for shale shaker deck and screen. It can project the shaker deck and extend shaker screen servicing time. And the insert type sealing rubber is easy for replacement. It is avoid to use bolts or screws.
3) Shale shaker bottom deck made from Stainless Steel for long service life.
4) Heat treatment on complete shale shaker deck for High G force operation. The adjustable G force is up to 8 G.
5) Pretensioned composite frame shale shaker screen for better separation and longer lifetime. The wedge type screen fixing is for fast screen replacement.
6) Famous Brand Vibration Motors: CN EX, IEC Ex, ATEX and UL Certified for clients’ optional.
7) Electrical components of the control panel: SIEMENS, Schneider Brand
8) Flexible feeding type including Weir Feed, Top Feed, and Hopper Feed for different applications.


Shale shaker is the most popular separation equipment of drilling mud system, no matter for oil and gas drilling or for non-oil drilling field, like for piling, micro tunneling, CBM, water well drilling, mining, or other construction separation system.

Shaker deck angle is an importance factor to affect the shaker performance. The suitable shaker deck angle can ensure a better separation performance, can enlarge the mud handling capacity, and also it can enlarge the shaker screen lifetime. Per different mud condition and different mud flow, the shaker deck angle may be different to reach a better performance.

For different shaker brand, the shaker deck angle adjustment system design is different. GN Solids Control patent design shaker deck angle adjustment system is welcomed by operators.

The operators like GN Solids Design shaker deck angle adjustment system as below reasons:
1) GN Solids Control shale shaker deck angle can be adjusted during shaker running, while most other brand shakers have to be stopped before adjust the shaker deck angle. It can save time and simplify the operation.

2) GN Solids Control shale shakers utilize Synchronous deck angle regulation system.
It is Mechanical Deck an¬gle adjustable device which can working while shaker is working.
And the Synchronous deck angle regulation system can ensure both side angles changed at the same rate on matter operated from which side. While for other brand shakers, operators have to change the shaker deck angle from one side, and then change another side to the same degree. It takes longer time.

3) GN Solids Control utilizes Ratchet wrench to change the shaker deck angle. The Ratchet wrench is in the tool box on the shaker deck.

Another advance of GN Solids Control shale shaker is the sealing rubbers. GN Solids Control shaker deck sealing rubber is inset type. Compared with screw fixing type, it is reliable for working, and easy for maintenance and replaced.

This week, a batch of drilling waste management equipment is under running test before delivery. It is a full package of drilling waste management system for oil and gas drilling field. After proved qualified by the running test, the drilling waste management system will be packed and shipped to Russia client by international railway shipment. The drilling waste processing equipment for the Russia client will be used for treat oil based mud and oil based cuttings in their rig site.


Below is the major processing equipment included in the containerized drilling waste management systems:

1) Vertical cuttings dryer
Vertical cuttings dryer are the major processing equipment for oil based mud and oil based mud cuttings. It is an effective machine to recovery more valuable drilling mud. After VG dryer, the oil on the cuttings can be lower down to 3% ~ 5%.

2) High speed decanter centrifuge
It is 14 inch high speed decanter centrifuge in the cuttings drying system to using together with vertical cuttings dryer. As the drilling mud recovered from vertical cuttings dryer is too heavy to reuse. High speed decanter centrifuge will be used after it to remove ultrafine solids and reduce the mud weight.

3) Containerized dewater unit for chemical dosing
It is a 3-tank automatic chemical dosing system in the waste management system to help the centrifuge to remove ultrafine solids smaller than 2 microns. As the high speed decanter centrifuge is gravity separation equipment. It can only remove 90% solids above 2 micron. For the centrifuge itself it cannot remove ultrafine solids smaller than 2 microns.

All feeding pumps, connection pipelines, and control system inside the system for included for a turnkey solution.

Besides the mentioned drilling waste management equipment, GN Solids Control also make others waste management equipment, like screw conveyor, solids vacuum transfer pump, drill cuttings solidification unit, big bowl centrifuge 18inch, 22inch and 30inch, automatic tank cleaning system, oily sludge treatment system, etc…