Month: November 2021

Below is the photo of one set of drilling cuttings treatment system working at rig site for international oilfield service company, the customer is satisfied with the treatment result. It is used to treat the oil based drilling cuttings from primary shaker, we suggest the user to collect the drilling cuttings from desander, desilter and decanter centrifuge separately and send to oil sludge separation system in the factory to get pure water, recovered oil and solids for disposal. If not meet the disposal standard, it can be sent to Thermal desorption unit for further treatment.

The pre-condition to use the vertical cuttings dryer including that the drilling cuttings should be oil based drilling waste, and only from primary shaker; the drilling cuttings should not be accumulated for too long, the long it is collected, the hard to separate the oil from solids, which will influence the treatment result. The drilling cuttings should not be polluted by rain water and other water, which will increase the water content, the discharged solids will with more moisture.

The high G drying shaker with the function to reduce the solids content, to get the better treatment result, we suggest client to use big screen opening of the screen basket, but by this way, some of the fine solids will be remained in the fluids, if the solids content is too high, the decanter centrifuge will be blocked and it is wear very fast, so we add a high G drying shaker  between them, no need extra feeding pump, just through flow by gravity, it will increase the separation efficiency of the whole drilling cuttings treatment system.
The decanter centrifuge is the last step treatment to separate the fine solids from the mud, the fluids can be reused to prepare for new drilling fluids and reused by the drilling rig.

Recently one batch of linear motion shale shaker, mud cleaner, decanter centrifuge are ready for shipment to oilfield service company. They are used to treat the used drilling fluids and recycle them to prepare for new drilling fluids, the new drilling fluids will be reused for drilling rig. As one of the solids control equipments and system manufacturer in China, GN solids control can produce complete line solids control equipments, including linear motion shale shaker, elliptical motion shale shaker, mud cleaner, desander, desilter, vacuum degasser, decanter centrifuge, mud agitator, centrifugal pump, mud gas separator, vertical cuttings dryer, mixing hopper, shaker screens, screw pump, screw conveyor, etc.

The single layer shaker screen with 4pcs panel shaker screens with 2.73m2 screen area, the equipped shaker screen is composite material frame shaker screen for longer working life and better separation performance. The mud cleaner with same model bottom shaker, the client can stock the wear parts convenient, the desander cone and desilter cone are installed with 1500gpm treating capacity. The cone is made of 100% polyurethane for better abrasion resistance. We can provide mud cleaner feeding pump – centrifugal pump, complete with pump head, explosion proof motor, pump skid, pump control panel, coupler with cover, etc.

The GNLW454ET-VFD decanter centrifuge is a high ratio 18 inch bowl decanter centrifuge with VFD control panel. The bowl diameter is 18 inch, the bowl length is 74.5 inch, the designed capacity is 400gpm, the typical treating capacity is 300gpm, The max bowl speed is 3500rpm, typical bowl speed is 0~3200rpm. Max G force is 3084G, typical G force is 0~ 2578G. The screw is protected by tungsten carbide tiles, the fluids distribution port and solids discharged port is protected by tungsten carbide alloy. Normally we use screw pump as decanter centrifuge to adjust the flow rate easily.

GN solids control design and produce 240m3/h, 360m3/h, 500m3/h TBM Slurry Separation Plant, which is suitable for big TBM project. The features of GNTBM slurry separation plant:

1.    Compact design, module design, integrated design, small footprint, easy transportation
2.    Customized design, can change our design as per client’s requirement
3.    5 phase separation, the discharged solids is much drier, and the fluids is more clean
By assembly different modules, we can provide more different treating capacity system.
Basic model:

GNTBM-240 ( 240m3/h)
GNTBM-360 ( 360m3/h)
GNTBM-500 ( 500m3/h)
Assembled model:
GNTBM-800 ( 800m3/h)
GNTBM-1000 ( 1000m3/h)
GNTBM-1500 ( 2000m3/h)
GNTBM-2000 ( 800m3/h)
GNTBM-2500 ( 2500m3/h)
GNTBM-3000 ( 3000m3/h)
Recently one set of 360m3/h TBM slurry separation plant are ready for shipment to pipe jacking engineering company. The technical configuration is as below:
1.    Coarse solids separation shaker : GNZKR-1230, 1 set
2    Double deck mud cleaner :GNZY705E-Y3S16N, 1 set
the bottom shale shaker is a double deck shale shaker, with 3 ea of 10 inch desander cone and 16ea of 4 inch desilter cone , the total treating capacity is 360m3/h. the screen area is 4m3. The vibration strength is max 7.5G ( adjustable)
3 Desander feeding pump is GNSB8X6-14/12J, desilter feeding pump is GNSB8X6-14/12J.
4.    The system frame is 6058 x 2438x2891mm, with fluids catching tank, during transportation, the coarse solids separation shaker will be disassembled.
The 5 phase separation process including:

Pre-treatment : coarse solids separation, to separate the big solids, stones, sand
Desander cone separation, the separation cut point is 45 microns
Desilter cone separation: the separation cut point is 20 microns
Mixing: the collected fluids will be used to prepare for new fluids to be reused.
Decanter centrifuge: the separation cut point is 2~5 microns
If you need a customized solution for TBM slurry separation plant, pls contact with GN solids control.

3 phase disc centrifuge and 3 phase decanter centrifuge is 2 equipments normally used for oily water separation, both of them have their advantages and disadvantages.
The comparison is as below:
Both of the 3 phase disc centrifuge and 3 phase centrifuge are for light liquid, heavy liquid, and solids separation, just one is vertical centrifuge, the other one is horizontal centrifuge.
The working principal is different:

3 phase Disc centrifuge: the oily water is feed into the disc centrifuge, under the centrifugal force, the material pass through the disc bundle separation intervals, the light liquid and heavy liquid are discharged by the lower centrifugal pump and the upper centrifugal pump respectively, the solids is discharged regularly.
3 phase decanter centrifuge: when the oil sludge is feed to the centrifuge inlet pipe and enter into high speed bowl, the material rotates synchronously with the bowl.The centrifugal force became less from outside to inside. The solids are pushed by the screw conveyor, the water is discharged from the nozzle in the upper, the oil is discharged from the bottom nozzle .

The disc centrifuge can be applied for materials with fine solids and with less solids content, so the material to be feed to disc centrifuge is very strict limited, the solids content should be less than 3% and the particle size is no more than 1mm, so normally we will use a decanter centrifuge before the disc centrifuge, to reduce the solids content and separate the big solids from the oily water/ oil sludge. So the cost of the proposal with a decanter centrifuge and a disc centrifuge will be definitely higher than 3 phase decanter centrifuge, but the treatment result will be always better, it can meet the requirement for oil recovery, solids disposal safely and water to be sent to waste water treatment.

As a waste sludge dewatering equipments manufacturer in China, GN solids control can produce a range of sludge dewatering equipments for our clients applied for different industries. Such as dewatering centrifuge, screw press dewatering machine, chemical doing unit. Recently one batch of waste sludge treatment equipments are ready for shipment to our environmental company customer.

Dewatering centrifuge unit with chemical doing unit is the most popular dewatering equipments for waste sludge treatment, like oil sludge treatment, construction waste sludge treatment, industrial waste sludge treatment. It is consist of one unit of dewatering centrifuge with VFD control panel, one unit of centrifuge feeding pump, one set of fluids collection tank, one unit of chemical dosing unit, sometimes it is installed on the skid of mud tank, sometimes it is in a separate skid or installed inside a 20ft container for sun/water proof and convenient operation. The waste sludge and prepared chemicals are mixed inside the centrifuge feed pipe, sometimes we will install Static mixer before that for their better mixing, then the mixture sludge will flow to centrifuge and treated as solids and liquid. If the user need further treatment like fluids with fluids, such as oil and water, we will use 3 phase decanter centrifuge or 3 phase disc centrifuge to treat the fluids to get pure oil and relatively pure water.

The screw press machine is introduced as sludge extrusion dewatering equipment, compared with filter press and dewatering centrifuge, it has its own advantages and disadvantages. For energy saving, decanter centrifuge is the highest engery consumption, ,and screw press is the lowest, for cost issue, filter press is the highest, decanter centrifuge in middle and screw press is the cheapest. For treating capacity, decanter centrifuge is high with better treatment result, the screw press is lower, for operation cost, screw press is the lowest.