Drilling Waste Management

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 screw press dewatering unit is designed and made to treat sludge and sewage waste water. GN screw press dewatering machine is widely used in sewage treatment projects of municipal, aquaculture, food, starch, oil, pharmaceutical, chemical, paper, leather and other industries.

GN screw press dewatering unit is a kind of economic and environmental friendly sludge dewatering treatment product. It is a new type of sludge extrusion dewatering equipment by using the principle of screw extrusion, through the strong squeezing force generated by the change of screw diameter and screw pitch, and the tiny gap between the floating ring and the fixed ring, to realize solid-liquid separation.

GN dewatering screw press unit includes below items:
1.PLC Smart control electrical panels for automatic control.
2.Chemical enhancing dewatering system for mixing and dosing flocculants into the waste water, slurries or sewage.
3.Sludge thickening and dewatering device
4.Liquid collecting tank to receive the recovered water from the screw press treatment.

GN dewatering screw press unit is with automatic control technology, which can mix and enhance flocculants automatically. After chemical enhancing, the screw dewatering press unit can running continuously to complete the sludge thickening and squeezing, finally return or discharge the collected filtrate liquid.

Besides dewatering screw press unit, GN Solids Control also makes automatic tank cleaning system. GN system is running automatically after preset parameters of the control panel. By adding the right tested chemicals, operators can achieve a satisfied liquid separation result. It can save time and save water in this case to further save cost. Some users of automatic tank cleaning system mentioned that, before without the automatic tank cleaning system they took 4 ~ 5 workers to clean one tank with 4-6 hours, now they just need 2 workers to clean one in 2-3 hours. It saves 80% man power and operation time.

If clients could share some technical demands, GN Solids Control is willing to check with engineering team and offer a customized solution to suit for clients; projects.

GN Solids Control is a mainly focusing on liquids and solids separation. GN Solids Control is capable to make waste water treatment system. GN Solids Control can make waste water treatment system to treat both oil slurry and non-oil slurry. The separation system for oil surry and non-oil slurry is not the same.

GNWTU-50A is a waste water treatment Unit specially design and made by GN Solids Control. The waste water treatment Unit is a special designed system for construction mud settlement, as well as for industrial waste water settlement. The maximum discharge rate of the GNWTU-50A waste water treatment Unit up to 50m3/h. It is a system designed to treat non-oil slurry.

GNWTU-50A waste water treatment Unit can be used for medium size sites such as civil engineering projects, or building project, like piling, and micro tunneling etc…

After the chemical dosing separation application, the suspended solids content can be below 50 mg/liter. In this case the treated water can be either discharged into the public drainage system or recycled for further use. The treated water can be reused of as drilling fluid, vehicular washing bays, recharge of wells, toilets, cube curing, ponding tests. This saves a lot of cost for water and protects the environment.

GNWTU-50B Wastewater Treatment Unit is a special designed system for oil water and solids separation system. Maximum discharge rate of GNWTU-50B Wastewater Treatment Unit can up to 50m3/h. GNWTU-50B Wastewater Treatment Unit is designed for industry waste water with suspended solids and free oil.

The chemically enhanced separation reduces the suspended solids content below 50 mg/liter and free oil to be below 10 mg/liter.

In this case the treated water can be either discharged into the public drainage system or recycled for further use. The treated water can be reused as drilling fluid, vehicular washing bays, recharge of wells, toilets, cube curing, ponding tests or industrial applications.

This saves a lot of cost for water and protect the environment.

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).

GN Solids Control design and make vacuum pump for solids and sludge suction and transfer. Sludge vacuum pump is a high efficiency and powerful suction pump for high solids content and big size solids material suction and transfer.

GN solids and sludge vacuum transfer pump can suck and discharge oil sludge material with solids content up to 80%. And the max. solids size the vacuum pump is capable to transfer can up to 75mm.

GN solids and sludge vacuum transfer pump is an ideal equipment used at offshore drilling rig platform. As at offshore drilling rig platform, the layout is very compact, space is very limited. Screw conveyor is popular used at on shore drilling rigs to collect and transfer drilling cuttings from solids control shale shaker, desander, desilter, mud cleaner, and decanter centrifuge. But screw conveyor takes a bigger footprint. The space is very limited at offshore platform. Screw conveyor is not suitable offshore drilling mud system.

Vacuum pump is suitable for this situation. A cuttings transfer station is used before vacuum pump after solids control equipment to collect drill cuttings. And then through hoses, vacuum pump can suck drilling cuttings from the cutting transfer station, and discharge to outside cutting storage tanks or places which can be max. 1000m away from the solids control equipment.

GN vacuum pump can also be used to suck and transfer rocks, sands, powder material directly. We can see, if the material is flowable, GN vacuum pump can be used.

As GN solids and sludge vacuum transfer pump is 100% driven by air. There is no electrical components. But the vacuum pump can suck material max. up to 50, and discharge material up to 1000m. In this case, in order to support the powerful suction and discharging capability, a big air supply is necessary to support stable running of the pump.

GN Solids Control Screw Conveyor is popular in the oil and gas industry for transfering the drilling cuttings, and feed the drill cuttings to processing equipment, like to feed to the vertical cuttings dryer, high G force cuttings dryer, and cuttings collection box. GN designed different sizes of auger diameter, 12 inch, 14 inch, 16 inch. They are the most popular 3 sizes, each size has 4 different length for option according to the drilling site of the customer. GN Solids Control can also make small dia. auger 10 inch and big dia. auger 18 inch.

Some days ago, a client contacted GN Solids Control to inquire about drill cuttings screw conveyor. Below is the communications between the client and GN Solids Control.

Client’s Question: Do you have 5.5 m transfer auger?

Comments and questions from GN Solids Control: Why you ask for 5.5m auger? Do you mean transfer length is 5.5m? GN Solids Control standard screw conveyor is combined with standard sections with 12ft in length. Job site operators can remove a mid. Section to shorten the transfer length, or add a mid. Section to extend the transfer length. For standard auger models, the available length is 12ft, 24ft, 36ft and 48ft. And the auger dia. varies from 10 inch to 18 inch.

Client’s reply and comments: I want 5.5 m auger. In this case, I can put the auger into 20ft container. By the way, I will need a 20ft containerized dewatering unit. Can I put the 5.5m auger into the 20ft dewatering unit container?

Comments and questions from GN Solids Control: What materials you want to transfer with the auger?

Client’s reply and comments: I want to transfer oil sludge with the auger.

Besides used for oil and gas industry, GN Solids Control screw conveyor is also popular in other applications, below are some of the applications of GN Screw conveyor:
1) Environmental Waste management industry for material transfer
2) Mining and Coal industry transfer
3) Construction field waste managerial and bulk material handling and transfer
4) Grain industry.
5) Chemical and Pharmaceutical Engineering Industry.
6) Food & Beverage Industry
7) Power and metallurgy Plant

This week, a client contacted a sales manager of GN Solids Control; he said he wanted to order some Augers. He asked GN Solids Control sales manager to inquire what augers can GN Solids Control make, and he also want to know what the safety protections on GN Solids Control auger are equipped, so someone will not be hurt while using it.

GN Solids Control recommends the client some of the same safe standard for a major Oil copany in Middle East. Below are some of the HSE standards suggested to the client:

1) GN Solids Control can equip grab wire along the auger length: operator can stop the auger at any place along the auger. And in case the auger cover is opened, or not closed well, the auger will be stopped automatically. In this case, operators will not be hurt.

2) Control panel can be equipped with E-stop and with control for the grab wire, to switch off power supply to the auger automatically in case the auger covers are opened or removed or not closed or not appropriately fixed.

3) Another optional safety protection is Audio and / or visual alarm system on auger control panel: the voice and light alarm will automatically switch on once the power is switched on, and the Audio and / or visual alarm system keep for some seconds before the auger start rotating. The alarm gives time for the nearby operator to know the screw conveyor will start rotating, and reminder them to keep away.

Auger is also known as screw conveyor. It is widely used at oil and gas drilling flied. Screw conveyor can be located under shale shaker, mud cleaner, desander, desilter, or decanter centrifuge, to collect drilling cuttings discharged from solids control equipment, and transfer the drill cuttings to drilling waste management equipment, like high G force shale shaker and vertical cuttings dryer.

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…

Many people are interested in GN Solids Control Screen Vacuum System. It is not a popular technology, many people do not know much about the vacuum screen technology. Many customers contact GN Solids Control to ask for information of Screen Vacuum Unit, including Catch Pan, Hoses and all the required accessories. Below are some communications between clients and GN Solids Control.

Question: The Screen Vacuum Unit is designed to be used on Onshore rig and offshore rigs. There are different shale shaker models at different drilling rigs. Can GN Solids Control build Catch Pans based on the existing shale Shaker models?
Reply from GN Solids Control: GN Solids Control can only build catch pan for GN own design shale shaker, and a few shale shaker models. GN Solids Control cannot make catch pan for other brand shale shaker at this moment.

Question: It said, the air pressure required is 100-150 psi. Most of the rig air compressor only supply 80-120 psi, would this affected the Screen Vacuum Unit performance?

Reply from GN Solids Control: 80-120 PSI is fine.

Question: What are the sizes of hoses from the catch pan to the Screen vacuum Unit? What are the chances of this hoses being plugged up?
Reply from GN Solids Control: It’s 2 inch hoses from the catch pan to the screen vacuum unit.
Because of the high vacuum which is up to 25 HG (Mercury Column), the power for suction is high. And also the hose for the suction is specially designed with anti-blocking material like plastic inside the hose. So it will avoid the blocking.
The capability of the vacuum pump is shown below as in the video:
https://www.gnsolidscontrol.com/sludge-vacuum-pump

Question: Where is the recovery fluid going to be discharge? Back to the active or through centrifuge?
Reply from GN Solids Control: The recovery fluid will go back to the shaker tank under the shale shaker, it needs to be treated by the afterward solids control equipment like desander desilter or decanter centrifuge. The advantage for our vacuum screen unit is that, you can calculate the flowrate of the recovery fluids volume.