decanter

GN Solids Control is a worldwide famous
brand of mud solids control system, drilling waste management system, as well
as replacement shaker screens.

This week, GN Solids Control China factory
finished a mud system for a domestic project. It is a 4-tank mud system for
750hp drilling rigs.

1) The 4 mud tanks of the 750hp rig mud
system are the same size with 40ft container. And the tanks are equipped with
3-runner oilfield skid. The oilfield skid is with 250mm at each tank ends. It makes
the tanks easy to movement at jobsites.

2) GN Solids Control equips 2 sets Solids control
linear motion shale shaker separator for the system. The system is equipped
with 2 each 3-panel shale shaker, model GNZS703E. It is the most popular shaker
models for oil and gas mud system from GN Solids Control.

3) In this system, the clients choose 1
desander separator and a desiler separator.

The desander model is GNZJ752-2S. It is
equipped with 2 ea 10’’ desander cone. Each 10’’ desander cone is with max. 120
m3/h (528GPM) handling capacity.

The desilter cone model is GNZJ752-12N. It
is equipped with 12 ea 4’’ desilter cone. Each 4’’ desilter cone is with max.
20 m3/h (88GPM) handling capacity. For totally 12 ea 4’’ desilter cone, the
desilter handling capacity can reach to 240m3/h (1056GPM).    

4) The 4-tank mud system is equipped with a
middle speed decanter centrifuge to recovery the barite and reduces the mud
weight. The centrifuge model is GNLW452. It is a most cost-effective big bowl
decanter centrifuge widely used in solids control mud systems for oil rigs.

5) And there are many mud agitators, mud
guns, lights, and pumps for the system.

6)
This clients choose a separate jet mud mixing system. The jet mud mixing hopper
and mixing pump as well as control panel are all mounted in a separate oil field
design skid. It is easy to move it and work to different mud tank systems.

Shale shaker, mud cleaner and desander, desilter are the most common solids control equipment for different drilling rigs, like oil and gas drilling, Horizontal directional drilling, coal bed methane (CBM drilling), water well drilling, piling, micro tunneling, and other trenchless and underground activities.
GN Solids Control as one of China leading manufacturing for solids control mud recycling system and equipment, they exported some shale shaker and mud cleaner for Hong Kong China for a trenchless project.
The client bought equipment from GN:
1) Solids Control shale shaker, GNZS703E.
It is a linear motion shale shaker with 3-panel shaker deck. It utilize pretention shaker screen and mounted by wedge for fast screen changing. GN offers steel frame screen and composite materials for its screens. Customer can choose suitable type per need. All GN shaker deck is made from stainless stain for better anti-corrosion and long lifetime. 

2) Mud cleaner GNZJ703E-3S16N
The mud cleaner is the combination of a linear motion shale shaker GNZS703E, 3 × 10 inch desander cone and 16 × 4 inch desilter cones. The cone assembly is mounted on the shaker deck. It is user friendly design. If you do not want to use mud cleaner, you just remove the cone assembly parts and use it as a shale shaker.
3) Mud cleaner ZNZJ703E-16N.
It is the combination of shale shaker and desilter cone. The under flow shale shaker is GNZS703E. Normally clients choose underflow shale shaker the same with solids control shale shaker. For this mud cleaner, it is only 16 ea 4 inch desilter cone, no desander cone applied.

Other solids control equipment can be offered by GN:
Complete mud recycling systems, mud tanks, decanter centrifuge, mud agitator, mud gun, poor boy degasser, mud gas separator, jet mud mixer.
Solids Control equipment is only a small part of GN Solids Control company. The main field of GN group is drilling waste management. f you want more information, or you have any questions on drilling waste management, welcome you contact GN group at any time.

GNLW452 is an economic standard decanter centrifuge. It is specially designed and made by China top solids control manufacturer – GN Solids Control Company. It is a basic centrifuge model for middle speed. It is widely used for barite recovery. Another popular function is to reduce the weight of high gravity mud, like used in HDD mud system to reduce the weight of the mud.

Parameters of GNLW452 middle speed decanter centrifuge for mud recovery system or barite recovery.

Dimension: The centrifuge is with 450 mm (18 in) bowl diameter and 1105 mm (43 in) in length. So some customer called it big bowl centrifuge.
Speed and G force: The max. bowl speed is 1800 rpm and the typical speed is also 1800 rpm. G force under 1800rpm is 815. Differential speed is 32rpm @ 1800rpm. In some cased, drilling site may need a lower speed, in the condition that, the mud weight is big, or want a bigger capacity, GN Solids Control can offer another set of pulley and belt to get a lower fixed speed, like 1200 rpm. In this case, customers only need to change the pulley and belt to lower down the speed.
Separation point: 5~7 microns. It means, it can remove solids bigger than 5 ~ 7 microns. Bigger than this point, the solids will remain in the mud. For HDD mud recovery system, this separation point is good. And when GNLW452 is used for barite recovery or used to reduce the weight of the mud, it is mainly used for pre-separation. There normally will be another set of high speed centrifuge for fine solids separation.
Recommended feeding pump for GNLW452 centrifuge is 11kw (15hp) screw pump. GN Solids Control recommended German brand NETZSCH pump feeding for the centrifuge.

Advantages of GNLW452 middle speed decanter centrifuge for mud recovery system or barite recovery
1) Single motor design for more compact design
2) Screw protection is interchangeable ceramic tile for longer lifetime and easy maintenance.
3) Screw flow distribution port and bowl solids discharge port protected by tungsten carbide alloy.
4) Easily adjustable liquid discharge weir height for flexible application.

Applications of dewatering unit
1) Dewatering unit is an important part for waste water treatment.
2) Combined with high speed or super high speed decanter centrifuge, dewatering unit is widely used for water base mud drilling cuttings treatment.
3) Dewatering unit can be used in TBM (Tunnel Boring Machine) drilling mud system
4) Dewatering unit can be used in dredging slurry separation system in civil projects. In this case, it is used together with belt compressor.

Flocculants is the most important part to effect dewatering unit performance. In order to insure a better performance of dewatering unit, we should pay attention on below points:
(1) If the surface of the flocculants powder is dissolved too rapidly, there will be particle mutually attached, therefore it will cause the particle interior does not be dissolved completely; the usual operation is to use various types of dispersing and dissolving device.
(2) Per different conditions, the time used to dissolve the flocculants varies. The main factors may as below:
A. The types of flocculants be used;
B. The water quality used as dissolution;
C. The temperature of water
D. The mixing efficiency.
Normally, its takes around 1hour for flocculants powder to be fully dissolved. If the flocculants cannot be mixing completely, it will reduce the performance.

Dewatering unit Design in drilling waste management field
Dewatering unit is usually put into container. GN Solids Control company offers 20ft containerized dewatering unit and 40ft containerized dewatering unit.
Dewater centrifuge for dewatering unit can be put into the container, inside the container or even on the top of container.

When dewatering unit is used together with decanter centrifuge. It should pay attention to that: the chemicals should add on centrifuge feeding pump outlet pipe, and before enter into centrifuge. The mud cannot be mixed with chemicals and then transfer to centrifuge. Pls refer our former mail for dewatering unit pipeline.

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1500HP land drilling rig usually match 2000bbls mud system. The mud system will have complete full 4 stages solids control equipment and with 5 steps separation process.

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Equipment included in 1500 hp land drilling rig mud system:

1) First stage solids control – Shale shaker GNZS594E / GNZS703E linear motion, 3 each

2) The second & third stage solids control – Mud cleaner GNZJ594E-3S-16N / GNZJ703E-3S16N, 1 each

3) Vacuum degasser GNZCQ360 to remove gas from drilling mud before enters into mud cleaner desander / desilter cone.

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4) The fourth stage solids control – Decanter centrifuge, 2 each

 One decanter centrifuge GNLW452S in middle speed for barite recovery.

 Another decanter centrifuge GNLW363 in high speed to separate the low gravity mud.

5) Jet mud mixing & shearing mixing system, with GN high efficiency centrifugal pump and shear pump for chemical shearing and mixing.

6) 7 each Mud tanks: shale shaker tank, decanter centrifuge tank, suction tank, mixing tank, shearing tank, storage tank 1 or 2 each

Above is the standard 2000bbls mud system for 1500 hp land drilling rigs. GN Solids Control can make customized mud system per user’s special requirements. If you need more information of other size land drilling rig mud system, you can visit GN website or send mail to vivi@gnsolidscontrol.com