Author: gnadmin

Decanter centrifuge is the effective equipment used to treat drilling fluids in oil and gas drilling, in CBM drilling or in TBM projects.

In order to meet different customers’ request, GN Solids Control have different model high speed centrifuge GNLW363 and low speed centrifuge GNLW452, with big bowl centrifuge GNLW553, GNLW453, normal size centrifuge 14’’ and the mini centrifuge GNLW223.

GN Solids Control is the most professional Chinese manufacturing on oil and gas drilling field decanter centrifuge. It makes high standard decanter centrifuge to cater for international market who is concerning on top quality. GN also makes economic standard to compete with China normal brand, price good but and quality still better than normal Chinese brand, to cater for customers who want to save cost.

Difference of GN international high standard and GN economic standard

1) Bowl material and conveyer:

High standard centrifuges use Duplex Stainless Steel 2205 by centrifugal casting, while economic standard use stainless steel 304 material

2) Screw protection

High standard centrifuges use interchangeable Tungsten Carbide Tiles, while economic standard centrifuge use ceramic tiles.

Remarks: Normal Chinese brand only use hard surface welding. The protection material is very thin. It is difficult for maintenance or prepare.

3) Bearing brand:

High standard centrifuges use famous brand SKF / FAG original bearing. While economic standard use NSK brand bearing.  

4) VFD control system

High standard centrifuges is 3 VFD for main drive motor, back drive motor and feeding pump. It useS PLC for smart control. The VFD panel is positive pressurized for hazardous areas. And with ATEX or IEC standard for option.

GN different standard decanter centrifuge can be used for both solids control and drilling waste management field. Beside decanter centrifuge, GN also makes other solids control equipment, like shale shaker, desander, desilter, mud cleaner, agitator, jet mud mixer. On drilling field management field, besides decanter centrifuge (normal size or big bowl), GN also makes vertical cuttings dryer, screw conveyer, NEMO pump, high G drying shale shaker.

If you have any inquire or any question on mud solids control & drilling waste management field, welcome you contact GN Solids Control company for solution.

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.

GN solids America has 2 units of variable frequency drive decanter centrifuge in Houston warehouse, we accept to make test firstly in the factory before shipment, welcome to contact GN solids sales to arrange for a test.

Working principal of VFD decanter centrifuge:

GN use Netzsch Brand NEMO pump to feed the drilling mud into the feed tube and flow to the centrifuge bowl, the bowl rotates high speed under , the screw conveyor, which is inside the bowl ,get a differential speed through the gearbox. The bowl and conveyor compose the pulley and belt with the differential speed and rotates in the same direction.

Under the working of different centrifugal force , the heavier solids paticles is pushed to the inner bowl and pushed theought the screw to the solids discharge port, the lighter weight fluids is settle down and discharged through the fluids output port, which with 6pcs adjustable dams to adjust the fluids pond depth inside the centrifuge bow.

Viriable frequency drive decanter centrifuge can adjust the screw rotary speed to achieve different working purpose. For example, when start the centrifuge, firstly you start it with a low frequency to get a lower electric currency to protect the VFD control panle, when it works stably, you can adjust the frequency to your required data to get your required performance. For the drilling mud with high gravity solids, 2500rpm rotation speed is required; for the drilling fluids with low gravity solids, 3200rpm is recommend. To collect the barite, 1800rpm is recommend. But such recommendation is just for oil & gas drilling, not inludes food, waste water, etc.

Applications of GN decanter centrifuge

1 solids control system, working to separate fine solids 2~5 microns

2 drilling waste managements system, working to separate the fine solids from the recycled mud from linner shale shaker

3 Liquid mud plant, working to separate fine solids and re-mix the drilling fluids, which can be re-used by the rig.

Mud System Check List

http://mengda0312.over-blog.com/2014/10/mud-system-check-list.html

Double deck shale shaker is widely used in CBM drilling (Coal bed methane), piling, micro tunneling and other HDD rig mud system as its big capacity and compact design. The top deck shaker screen can use steel screen (0.1mm, 0.2mm, 1mm etc… per jobsite condition) to separate the coarse size. The bottom deck use normal pretensioned frame screen (API40, 60, 80 etc…)

Parameters of GNZS705 double deck shale shaker

Model:                            GNZS705E

Vibration Mode:              Linear Motion

Vibration Motor:           2×1.94KW, Voltage and Frequency customized

Vibrating Strength:          ≤7.5G (Adjustable)

Treating Capacity:          528GPM(120m³/h)

Deck Adjustment:          -1°~5°

Top Shaker Screen:        3 Panel 2.1m3

Bottom Screen:                3 Panel 2.6m3

Weir Height(Back type buffer box):      895mm

Shaker deck material:           Stainless Steel

Weight:                            2000kg

Dimension (mm):                    2717x2012x1413

Remarks: Treating capacity test from mud:1.2g/cm3density & viscosity 45s & 60 mesh screens

Applications of GNZS705 double deck shale shaker

GNZS705 is a hot sale shaker model made by GN Solids Control company It is a double deck shale shaker with 5 screen panels: 2 screen panels in top deck and 3 screen panel in bottom deck. When the shaker model is used in CBM drilling system, piling system or micron tunneling mud cleaning system, customer choose steel frame screen for long lifetime and big volume. It is a common shaker model for GN compact mud system. It can even be used in GN350~500GPM HDD mud recycling system for small footprint and economic price.

Advantages of GNZS705 double deck shale shaker

1) The shaker model is made from Stainless steel material for better performance on anticorrosive.

2) Vibrating motor from world famous brand: IEC Ex, ATEX and UL Certified (Italy Oil or Martin brand motor, etc…)

3) The whole shaker deck is made from hot treatment. It is more stronger under high G force vibration.

4) Patent tighten rubber sealing for shale shaker deck and screen. It is with long life and easy for replacement.

5) Pretensioned shale shaker screen mounted with wedge for fast screen change.

6)  Flexible options on feeding type: Weir Feed, Top Feed, and Hopper Feed for different applications

7) The shale shaker can be mounted together with desander cone and used as a mud cleaner.

General description of Hydraucyclone desander desitler

Hydraucyclone is a normal parts used for mining industry, for drilling field, for waste water separation, soil depuration. In drilling field. Hydraucyclone can be used as desander desilter per different size. Or combined with shale shaker to work as mud cleaner. 

Big size desander cone normally used for mining, piling or CBM drilling.  Hydraucyclone for desander desilter in drilling fieldi usually small size:

1) Hydraucyclone for desander: 12inch, 10inch

2) Hydraucyclone for desilter: 5inch, 4inch

Main parts of Hydraucyclone for desander desitler. Take example of 4 inch desilter cone, it is components of below parts:

1) Shell

2) Cone tube

3) Drop in Apex

4) Orifice nut

When combined for a desilter machine, elbows and clamps, ball valves will be used for connection.

Principle of Hydraucyclone for desander desitler

Hydrocyclone is a cylindrical part of the conical vessel. The upper part of the internal cone section called the liquid cavity. Cone outside is provided with a liquid inlet pipe, and the liquid cavity is communicated to the tangential direction. The top of the container is the overflow port, the bottom is underflow (also called the discharging port). Cyclone size is determined by the maximum diameter of the cone. Its working principle is centrifugal sedimentation. Because of the coarse particles and fine particle size difference exists (or density difference), the centrifugal force, under the centripetal buoyancy, drag force of different sizes, due to the centrifugal sedimentation, pyramidal intermediate creates a low pressure area, forming a column of air, caused by vacuum suction effect, play, most of the fine particles in the cyclone under the actions of upper discharged from the overflow tube, heavy particles thrown to the wall of the barrel, slide along the barrel wall, from bottom outlet.

Materials ofd Hydraucyclone for desander desitler

Polyurethane is also called polyurethane formate, is a kind of polymer between the plastic and the rubber polymer materials. It has not only high strength plastic, and has the high elasticity of rubber. It is a new type of wear resistant material, an excellent comprehensive performance. It has many excellent performance, high wear resistance, in the synthetic material of the first, even more than some alloy steels. The polyurethane as hydrocyclone lining, its service life is four times of high chromium cast iron, four times eight times Ding hydrogen rubber, natural rubber. Polyurethane shore hardness in the range of 17~97 to 85~90, the best wear resistance.