Desander Desilter

The vertical cuttings dryer and decanter centrifuge should be lay on the telescopic skid for better performance and convenient operation. Recently we shipped several units of telescopic skid mounted vertical cuttings dryer and decanter centrifuge to international oilfield service company, they repeat the same order since 2014, and they are satisfied with the equipments performance, quality and our after sales service.

When the vertical G dryer and decanter centrifuge is installed on the mud tank, we will provide simple support frame legs, and the solids discharge trough is also an option if required.
Vertical cuttings dryer is an ideal equipment to treat the oil based drilling cuttings and SOBM, when used for water based drilling cuttings, high G drying shaker can work better and with higher cost performance ratio. The cuttings discharged from vertical cuttings dryer with oil content in the cuttings is below 5%, in some countries, it is permitted to be disposal directly or for landfill. In some other countries, it needs further treatment such as burning, TDU, Biodegradation or injection. The treated fluids will flow to an intermediate tank, then decanter centrifuge feeding pump will transfer the fluids to VFD decanter centrifuge to separate more fine solids from the fluids, the treated fluids will be collected by an centrifuge tank and transfer to active mud tank system for reuse or chemical mixing tank to prepare for new drilling fluids. The drilling waste management system is environmental friendly system to reduce the drilling waste and reduce the harmful to the earth, also can recycle more useful drilling fluids for the customer and save the drilling cost, especially in some countries the zero discharge system is compulsory, otherwise they cannot get permit for drilling project.

For more solutions of OBM, SOBM, WBM drilling waste management solution, pls contact with GN solids control.

Recently we shipped shale shaker and decanter centrifuge to International Environmental Company. They use GN equipments to treat the slurry collected from different recycling company, including metal, glass, silt, sand, plastic etc. By using GN equipment, they succeeded to separate out those valuable info such as metals, glass or silt to resell. The technical configuration is as below：

1）Before feeding to shale shaker, the operator use a crusher to broke all the materials recycled from different place into small size, otherwise the shaker screens will be damaged very quickly, and make it easier transferred by the pump. 4 panel drying shale shaker to separate coarse solids from slurry, the fluids dropped into the mud tank. The centrifugal pump feed the fluids to desander cone and desilter cone.

2) 4 panel mud cleaner to separate the fine solids from fluids, the desander cone separation cut point is 45 microns, the desilter cone separation cut point is 25 microns, the hydrocyclones material is 100% PU material for longer working life. The clean fluids drop into the mud tank, the decanter centrifuge feeding pump transfer the clean fluids to decanter centrifuge for further treatment.
3) GNLW553C-VFD decanter centrifuge with chemical dosing system to separate ultra fine solids up to 1 microns. Since adding the flocculants in the slurry will reduce the treating capacity of decanter centrifuge a lot, to meet the required treating capacity of the project, a big bowl big treating capacity decanter centrifuge should be applied.
The centrifuge discharged solids can be collected by waste bag or waste collection box, if the user want to get much drier solids, press filter can be applied.

As a professional manufacturer of shale shaker, mud cleaner and decanter centrifuge in China, our equipments can be applied not only for oil & gas industry, it can be also used for solids liquid separation project of environmental protection project.

Drilling waste management equipments for pitless solution including vertical cuttings dryer, high G drying shaker, VFD decanter centrifuge, screw conveyor, sludge vacuum pump, screw pump, etc. Recently GN solids control shipped one batch of drilling waste management equipments to International oilfield service company. The client collect the drilling waste from onshore and offshore rig site and dump the drilling waste together, with both water based mud and oil based mud drilling waste. The operator need one drilling waste management system which can treat both water based mud and oil based mud.

The working principal is as below:
The sludge vacuum pump pick up the drilling waste to the collection hopper of screw conveyor, which will transfer the drilling waste to high G drying shaker and vertical cuttings dryer. If there is no vacuum pump, an auger system to collect all the drilling waste from the rig solids control system is necessary. The cuttings are separated out by high G drying shaker and vertical cuttings dryer and collected by skips, the fluids are dropped into the mud tank, the centrifuge feeding pump transfer the clean fluids to decanter centrifuge to separate the fine solids, the cut point is 2~5 microns. The clean fluids cn be reused for drilling rig and prepare for new fluids. By using proper chemicals, the separation cut point is up to 1 microns, most of the solids can be separated out.

The pitless solution or zero discharge system is consist of solids control system and drilling waste management system, the solids control system is working to reduce the discharged drilling waste, which will be collected by screw conveyor system and transferred to drilling cuttings treatment system. The discharged solids can be collected by waste container for land fill or injection. The whole process is environmental friendly design without needing a waste pit on the ground.

As one of the high speed decanter centrifuge manufacturer in China, GN solids control can produce different size decanter centrifuge for different applications from 9 inch bowl to 30 inch bowl size. Recently one batch of high speed decanter centrifuge are shipped to Russia, the model is GNLW363CG, which is the best seller among all the centrifuge models.

The features of GN high speed decanter centrifuge:
1) Centrifuge bowl straight cone is made of duplex stainless steel 2304, which is much better than SS316 & SS304, the taper cone of the bowl and other components are made of stainless steel 316L.
2) The screw is made of stainless steel for better anti-corrosion, which is heat treatment up to 1000 degree, the opening screw propeller design increase the treating capacity

3) The bowl collection box is made of SS304 for better anti-corrosion, the air spring design allow one worker to open the collection box easily without damage their body.
4) The SKF brand bearing ensure the working life for reliable operation.
5) The screw propeller is protected by tungsten carbide tiles for longer working life, which is interchangeable if damaged.
The max speed of the high speed decanter centrifuge can be up to 3900 rpm, the normal operation speed is 3200 rpm. The max G force is up to 3063G, and the normal G force is 2062G. The decanter centrifuge is used to separate low gravity solids from the drilling fluids ( both for water based mud and oil based mud), we have pulley set with middle speed which can be replaced for barite recovery. The client can use VFD decanter centrifuge if they do not want to replace different speed pulley, the VFD control panel can adjust the speed of the decanter centrifuge for both LGS separation and barite recovery.

The dewatering centrifuge produced by GN solids control can be widely used for TBM, waste water treatment, oil sludge separation system, drilling fluids treatment, tailing slurry treatment, etc. industries.

The dewatering centrifuge should be with bigger size, when the chemical dosing system is applied, the treating capacity of the decanter centrifuge will be reduced a lot. Normally the bow diameter is 18 inch, 22 inch, or 30 inch, we have models of GNLW453-VFD, GNLW454-VFD, GNLW553-VFD, GNLW554-VFD, GNLW764A-VFD for option. The most popular model is GNLW553-VFD, with bowl diameter is 22 inch, the bowl length is 71 inch, the ratio is 3.2, the bigger of the ratio, the better of the separation performance of the material. The dewatering centrifuge is drived by VFD control panel with main motor inverter, back drive motor inverter, pump motor inverter, the centrifuge motor can be started with variable frequency so that the start current could be smaller, the motor will not easily burnt because of high current. All of the 3 VFD drive are used world famous brand for reliable working. The other electrical components are also made of world famous brand components, like Siemens, Shneider, Omron, etc.

The dewatering centrifuge and chemical dosing system are installed in a closed 20ft container with windows and doors for convenient transportation and operation. It can use for both powder and fluids chemicals. The dewatering centrifuge mechanical separation cut point is 2~ 5microns, by using proper chemicals, the separation cut point is up to 1 microns. Most of the ultra fine solids can be separated out from the TBM slurry and get the clean water, which can be reused for Tunneling boring machine.
The TBM slurry should be treated by desander unit or mud cleaning unit firstly before feeding to dewatering centrifuge to protect the decanter centrifuge and improve the treatment efficiency.

One set of 15m3/h oil sludge treatment system shipment to domestic client for oil sludge separation project in China. As one of the professional manufacturer of oil sludge treatment system in China, GN solids control have 3 standard models with different treating capacity for your option, including 1 ~2 m3/h, 5m3/h, 15m3/h. If you need bigger treating capacity, we suggest to use several units of oil sludge treatment system.

A basic oil sludge treatment system including: vacuum pump, pre-mixing tank modular, coarse solids separation shale shaker modular, chemical dosing system, decanter centrifuge and 3 phase centrifuge separation skid with buffer tanks. The decanter centrifuge and 3 phase separation skid is the most essential components, the other modular in separate skid is to separate the coarse solids as much as possible and reduce the solids content, so that the decanter centrifuge will not be easily damaged because of high solids content, and the oil is easily separated from the solids. When the solids content is below 5%, and the solids size is below 1 microns, it can be freely treated by the disc centrifuge and get the pure oil, water and few solids.

For cheaper price and higher treating capacity, inclined plate clarifier, oil water separator can be utilized when the required performance result is permit, as the discharged solids with too much moisture, and separated water with much suspended mass, the separated oil BSW is also high, by using proper chemicals, the result will be better. The advantages is with cheaper price, higher treating capacity, no electricity power is required, when there is explosive gas involved in the sloop oil , it can be used freely without explosion .
We can design customized oil sludge treatment system according to different client’s requirement, pls contact with our sales engineer for more information.

The mud recycling system applications are widely used for international construction projects of HDD & TBM. We introduced some of the typical case study:
Project 1: China-Russia gas pipeline project,
CHINA PETROLEUM PIPELINE BUREAU China-Russia gas pipeline Trenchless mud recycling and cleaning system, there are 5 sets of mud recycling system working for the China-Russia gas pipeline project. The technical configuration of the mud cleaning system:

5 sets of 500 GPM HDD mud recycling system, include 5 sets of desander mud cleaner, 5 sets of desilter mud cleaner, 10 sets of drilling mud centrifuge, 5 sets of mud tanks. The working process is as below:
The centrifugal pump #1 feed the slurry from mud pit to desander cone, the discharged solids from desander cone dropped on the shaker screen to recovery more useful fluids, the dry solids are separated out. The fluids flow to mud tank through fluids discharge line. The centrifugal pump #2 feed the slurry from desander compartment to desilter cone, the separated solids from desilter cone dropped on the shaker screen to recovery drilling fluids, the dry solids are separated. The fluids flow to desilter compartment. The centrifugal pump #3 feed the clean fluids to decanter centrifuge to separate the fine solids and storage in the centrifuge tank.
Project 2: Hong Kong Airport

Hong Kong Airport 5.2 KM Aviation fuel Pipeline HDD Trenchless mud recycling system. The HDD mud cleaning system treating capacity is 1500gpm, including 2 sets of shale shaker GNZS703, 1 set of mud cleaner GNZJ703E-3S16N, 1 unit of mud tank, 2 sets of centrifugal pump and screw conveyor. The screw conveyor transfer the discharged solids continuously out and drop down from the discharge port.
GN solids control can design and produce customized mud recycling system for different HDD, CBM, TBM and pipling projects, welcome to contact with our sales engineer.

Several units of drilling fluids treatment high speed decanter centrifuge are shipped to Russia clients recently, this is repeat order again, their previous purchasing including shale shaker, mud cleaner, centrifugal degasser, middle speed decanter centrifuge, high speed decanter centrifuge.

The high speed decanter centrifuge is widely used to treat drilling fluids, drilling waste, oil sludge, construction slurry, industrial waste water and other sludge. The mechanical separation cut point is 2 ~5 microns, according to different client’s requirement, chemical dosing system can be used with decanter centrifuge, to increase the separation performance of the decanter centrifuge, the separation cut point is up to 1 microns. The centrifuge bowl is made of duplex stainless steel and the other components are made of stainless steel 316L, the bowl collection box is made of SS304, the screw is also made of SS304 by heat treatment, the screw propeller is protected by tungsten carbide tiles for longer working life, all the fluids touch parts are corrosion resistance which can be used to treat corrosive slurry. All the wearable parts are protected by tungsten alloy, like fluids distribution port, solids discharge port, screw propeller. The decanter centrifuge can be installed on the telescopic skid or mud tank based on different applications.

When used for drilling waste management system and oil sludge treatment system, the decanter centrifuge should be drived by VFD control panel. The main motor inverter, back drive motor inverter and pump inverter are all from world famous brand and installed within the positive pressurized VFD control panel. We can provide ATEX, IEC EX and CNEX according to different applications. The international famous brand HMI with touch screens for convenient operation, the user can adjust the differential speed, main speed convenient to get different separation result.
If you need decanter centrifuge for drilling fluids treatment, pls contact with GN solids control.

The mini decanter centrifuge is shipped to South America for solids liquid separation project. The function is to separate the ultra fine solids from the waste water, so that most of the fine solids can be separated out to get qualified liquid, which can be disposal directly or sent to third party waste water treatment facility for further treatment.

There are 2 models of mini decanter centrifuge for option, GNLW223D decanter centrifuge is normally used for diamond core drilling waste water treatment to recover water for reuse, also it can be used for mini oil sludge separation unit. GNLW224E-VFD decanter centrifuge can be used to treat waste water with high viscosity and higher density. The models with same bowl diameter 9 inch, but the bowl length is different. GNLW224E-VFD bowl length is 36.4inch, which is much longer than GNLW223D bowl length 26.4 inch, the waste water can stay longer inside the bowl, the discharged solids is much drier for easier disposal, the treated fluids is more clear, if necessary, proper chemical should be used together to increase the treatment capability. The mechanical separation cut point is 2 microns, by adding chemicals, it can treat solids up to 1 microns.

GNLW223D decanter centrifuge max bowl speed is 4500rpm, the typical speed is 3800rpm, gearbox ratio is 35:1, gearbox torch is 500N.M., max G force is 2492G, typical G force is 1777G. GNLW224E-VFD decanter centrifuge max bowl speed is 5000rpm, the typical speed is 0~4500rpm, gearbox ratio is 95:1, gearbox torch is 1400N.M., max G force is 3077G, typical G force is 2493G.
The bowl material is made of stainless steel 316, the screw is made of SS 304, and the propeller protection is by tungsten carbide tiles. The bearing is top brand NSK/FAG for longer working life. And the solids discharge port and fluids distribution port are both protected by tungsten alloy.

The decanter centrifuge for oil sludge treatment system produced by GN solids control is shipped to Brunei recently. For different treating capacity requirement, we have different models for option.
GNLW224EP-VFD decanter centrifuge is used for 1m3/h oil sludge separation system, GNLW363C-VFD decanter centrifuge is used for 5 m3/h oil sludge separation system, GNLW553C-VFD decanter centrifuge is used for 15 m3/h oil sludge separation system.

The working process is as below:
The vacuum pump pick up the oil sludge from the waste pit to pre-mixing tank, the chemical or water or diesel oil will be added in this process and the mud agitator is agitating to mix them evenly, the submersible slurry pump will transfer the oil sludge to shale shaker to separate the coarse solids from the oil sludge, then the fluids will drop down into the mud tank, the screw pump will transfer the fluids to decanter centrifuge, by adding proper chemicals to improve the separation performance. The fluids from decanter centrifuge will drop into the buffer tank, then flow to vertical centrifuge to separate oil and water. The oil and water will be recovered into storage tank.

The features of GN decanter centrifuge:
1) Centrifuge bowl is made of duplex stainless steel 2205 for longer working life.
2) The bearing is SKF bearing for stable working
3) The screw is made of stainless steel by heat treatment, the opening screw propeller to increase the treating capacity and improve the separation performance
4) The collection box is made of SS304 for better corrosion resistance.
5) The screw propeller is protected by tungsten carbide tiles, the solids discharge port and fluids distribution port is protected by tungsten carbide alloy. All of these protection is replaceable when damaged.
If you are interested in oil sludge treatment decanter centrifuge, pls contact with GN freely.