China has more and more strict regulation for environment protection. GN Solids Control makes various sizes decanter centrifuge for oil sludge treatment and waste water treatment. Besides centrifuge, GN Solids Control makes dewatering unit, waste treatment system, and other waste management equipment.

Last week, 2 sets of 22 inch big bowl decanter centrifuge are ready for assembly. The 2 centrifuges will be tested in the factory. After all QC process finished, the 2 sets decanter centrifuge will be shipped to a client in Yun Nan China.

The client is a very big and reputable industry in Yu Nan. Before knowing GN Solids Control, the client intents to import the separation decanter centrifuge. After they started to connect GN Solids Control, and they know GN Solids Control major market is international clients. GN Solids Control has rich experience on international projects. The client has great interest. They invite GN Solids Control engineer came to their industry in Yun Nan to communicate technical request. After that, they send engineering team to visit and talk with GN Solids Control directly to make sure the order.

The 2 decanter centrifuge is GNLW554EP, a 22 inch big bowl decanter centrifuge. It is a model specially designed for waste water treatment. The normal bowl length and diameter ratio is around 3. The bowl length and diameter ratio of GNLW554EP is up to 4. It means the slurry has to go through a longer route after entering into the centrifuge bowl. In this case, the slurries have a longer time for separation while going through the centrifuge. The recovered water is cleaner. And the discharged soil cake is dryer.

Besides 22 inch decanter centrifuge, GN Solids Control makes other models: 9 inch decanter centrifuge, 14 inch decanter centrifuge, 18 inch decanter centrifuge, 30 inch decanter centrifuge. GN Solids Control also makes various sizes of disc centrifuges and 3-phase decanter centrifuge.

GN Solids Control offers 2 proposals to treat slurries without oil, like to treat the used drilling mud, like drilling mud from oil well drilling, from construction field, from piling, or industry waste water.

The first option is GNWTU-50A Wastewater Treatment Unit very Economic. It is a sample separation by settlement. The solids discharge from GNWTU-50A Wastewater Treatment Unit is very wet. The recovered water is not clear. The chemical dosing unit is manually. And the solids and water quality after separation cannot be adjusted. Below are some feature of GNWTU-50A Wastewater Treatment Unit.

The chemical dosing unit is suitable for liquid chemical only. The Unit is a special designed for construction mud settlement, industrial waste water settlement. Maximum discharge rate up to 50m3/h.

The chemically enhanced separation reduces the suspended solids content below 50 mg/litre so that the treated water can be either discharged into the public drainage system or recycled for further use.

If the clients do not have high separation demands for the recovered water, they only want to separate as more waste water as apossible with the low cost, they can choose GNWTU-50A Wastewater Treatment Unit.

Another option is Chemical enhanced decanter centrifuge separation. It is precision separation. The solids discharged from chemical enhanced decanter centrifuge are dryer, and the recovered water is clean. But the cost is higher. As the chemical dosing system is in this proposal is automatically and all components are fixed into a 20ft fabricated container.

The decanter centrifuge is high speed C/W VFD control panel. The discharge solids and water quality can be adjusted while adjusting the centrifuge bowl speed and conveyor speed. The solids and water quality can also be adjusted while the feeding rate is changed. The less the feeding rate, the better the separation result (the solids is more dryer and water the clearer).

GN Solids Control makes drilling mud dewatering system for reuse and recycling the drilling fluids and waste water. For example, GN Solids Control is capable to make complete dewatering system for clear water extraction off drilling mud and drilling fluids.

The dewatering system for clear water extraction off drilling mud is not like drilling fluids solids control system or drilling waste management equipment, like like desanders, mud cleaners, shale shakers, etc. But it is a complete recovery of reusable water taken from drilling fluids. The system should be used together with chemical dosing. The dewatering system for clear water extraction off drilling mud includes chemical enhance mechanical separation.

GN Solids Control dewatering system for clear water extraction off drilling mud can be used by drilling fluids waste management companies. And it can also be used by companies which are with core business for water recovery off drilling mud, drilling mud solids control and drilling waste management. Actually the use will be for drilling mud used in oil well drilling water recovery. This is a conventional water base mud with components like salt, mennonite, barite, and polymers and so on. The type of dewatering system will be used for a closed loop drilling mud recycling system.

The major equipment which is used in dewatering system for clear water extraction off drilling mud including but not limited to following items:
1) Chemical Dosing Unit complete with
(i) PAM Flocculent mixing units, which is complete with mixing hopper and mixing tank system. There are stainless steel agitator for each tank compartment.
(ii) Flocculent dosing pumps,
(iii) Coagulant dosing pumps,
(iv) Chemicals metering system,
(v) Fluids transfer system,
(vi) Turbulent mixer system to properly mix waste fluid with flocculent and coagulant,
(vii) Agitators,
(viii) Pumps and motors,
(ix) Flow monitoring and control system,
(x) Control panel and process control system.
2) decanter centrifuge if needed.

HDD, full name is horizontal directional drilling. It is widely used for trenchless pipe jacking, like to lay a pipe under a river, to lay pipes crossing a road without damage the road surface. The drilling hole size is much smaller than micron tunneling machines. Micron tunneling machine is usually used to drill tunneling inside mountains, or crossing sea or big rivers.

The famous projects utilizing horizontal directional drilling (HDD) rigs includes nature gas transfer pipelines from Russia to China, and nature gas transfer pipelines from Russia to Europe. They both are very typical application to use HDD rigs for underground pipeline laying. horizontal directional drilling can also be used to drill holes for laying fuel oil pipes at airports.

Mud Cleaning and Recycling System is more and more popular used together with horizontal directional drilling (HDD) rigs in model cities. Its function is to filter, clean and recycle the drilling fluids from the drilling bore.

The main functions of drilling fluid or drilling mud are to provide hydrostatic pressure to prevent formation fluids from entering and to stabilize the bore. The drilling fluids is also used to keep the drill bit cool and clean, to carry drill cuttings back out to the surface, and to suspend the drill cuttings while drilling is paused or during the pullback process. Drilling fluid containing excess cuttings can easily damage the pistons, liners, and valves of mud pumps, In this case, it’s critical to clean the fluid down to trace amounts of solids.

A solids control Mud Cleaning and Recycling System for HDD rig is normally contains of mud tank, which divides into different compartment based on the function, like sand trap for shale shaker, desander tank, desilter tank for clean mud, decanter centrifuge for clean mud, centrifuge tank if there is a decanter centrifuge in the mud cleaning system. Mud mixing tank and mud storage tank for clean mud. Suck tank for mud pump to transfer qualified drilling mud from the mud cleaning system to HDD drilling rig.

Screw Conveyor (auger) and Vertical Centrifuge are widely used at oil and gas drilling site. This week, some sets of Screw Conveyor and Vertical Centrifuge is ready. They will be shipped to an International Environmental Engineering Company. The screw conveyors can be used to collect drilling mud and drilling cuttings from solids control shale shaker, desander mud cleaner, desilter mud cleaner, and decanter centrifuge.

Vertical centrifuge is popular called as vertical cuttings dryer. It is used to further recover usable drilling fluids from drilling cuttings waste; especially from the oil based drilling cuttings. The vertical centrifuge can be used to treat the oil base cuttings from solids control shale shaker, desander mud cleaner and desilter mud cleaner. But the vertical centrifuge cannot be used to treat drilling cuttings discharged from decanter centrifuge. As the solids sizes allowed for entering decanter centrifuge is too fine for vertical centrifuge. They will all pass the screen opening of vertical centrifuge, nothing can be recovered.

GN Solids Control offers 3 sizes screen basket for GNCD930 vertical centrifuge: 0.25mm, 0.35mm and 0.5mm. Solids sides bigger than the screen opening will be blocked and discharged from the vertical centrifuge screen basket. Liquid and solids with smaller size than the screen opening will go through the screen opening and recovered for further treatment. As the screen opening is big, most fine solids will be recovered together with the useful mud, it will be too heavy to reuse. Decanter centrifuge should be used after vertical centrifuge to reduce the mud weight.

The International Environmental Engineering Company will use the screw conveyor, decanter centrifuge and vertical centrifuge in an area, where the remperature is extra frozen in winter. GN Solids Control locates all the processing equipment: decanter centrifuge, vertical centrifuge, feeding screw pump and flush screw pump, insides a fabricated container. The container is located with windows, doors and heating system to keep warm in winter to protection the devices. Clients can choose the suitable screen opening to suit for their mud situation.

There normally 2 sets screw conveyors for vertical centrifuge for cuttings dryer. Firstly, there is a screw conveyor with auger transfer to feed the drilling cuttings to the vertical centrifuge dryer. After the vertical centrifuge dryer, there should be another set of screw conveyor to collect the dryer solids discharged from vertical cuttings dryer, and transfer to solids skips or other storage place.

Decanter centrifuge is very popular to be used together with chemical dosing system for dewatering treatment. The dewatering decanter centrifuge unit is widely used for waste water treatment and oil sludge treatment.

But how to choose the right model and right size dewatering centrifuge unit to suit for a certain applications? There are some questions for preparing accurate quotation:

1) Mostly, the chemical dosing dewatering system will be located at safety area. Non-explosion proof is enough. Can you accept non-explosion proof? 

2) If it is must to be explosion proof, can you accept CNEx (China National Explosion proof) for chemical dosing system inside the container?

Or is it must ATEX or IECEx standard? Price and leading time varies greatly when the explosion proof standard is different.

As the chemical dosing dewatering unit is allocated inside a fabricated container. While the decanter centrifuge and centrifuge feeding pump locate outside the container. Sometimes, clients accept CNEx standard chemical dosing dewatering unit, and the decanter centrifuge and centrifuge feeding pump can be ATEX Zone 1 or IECEx zone 1. 

3) Some regions and areas the temperature is high. GN Solids Control will suggest equipping Air Conditioner for the container. The Air Conditioner can be CNEx / ATEx / IECEx standard for Zone 1, and it can also suit for +55C degree? 

For example, GN standard 20ft containerized chemical dosing system equipped with A/C, the PAM Polymer dosing pump capacity is 1200L/Hr. The PAC Coagulant dosing pump is 500L/Hr. The dosing pump speed are both adjustable. If clients need customized dosing capacity, welcome to contact GN sales engineers.

4) What is the right size decanter centrifuge the client want for the chemical dosing system: 14 inch centrifuge, 18 inch centrifuge or 22 inch decanter centrifuge are the most popular for dewatering treatment. 

Vertical mount Oil field mud gas separator also called as poor boy degasser. Similar as fire foam system, Oil field poor boy degasser is a kind of safety device for oil and gas drilling rig mud systems.

Vertical mount Oil field mud gas separator has been used with choke manifold, BOP, and usually it is complies with gas igniter, to deal with the free gas invaded into the active drilling fluids, especially for drilling fluids with H2S or drilling holes not well balanced. Normally, the oil field poor boy degasser is used after choke manifolds / BOP, and before mud system shale shaker. After the Oil field poor boy degasser, the invaded gas will be discharged in 2 ways:

Firstly, the invaded gas will be discharged in to atmosphere via a long vent pipe on top of the poor boy degasser. We call it atmosphere poor boy degasser. But it is not big, as sometimes there maybe H2S inside the invaded gas, which is hazardous to human beings.

Another gas treatment way is more popular: the invaded gas will be lead to a place a little far away from the mud gas separation through extended vent line under the degasser. The vent line can be 50 ~ 100m away, it depends on the jobsite layout. There will be a fire igniter near the vent line outlet. GN Solids Control fire igniter is automatic type, it fires at setup frequency to fire the hazardous gas from mud gas separator.

The drilling mud from mud gas separator will flow into solids control shale shakers. As there are normally more than 1 shale shaker inside a solids control mud system, so before the mud flows into shale shaker, it will flow into a distribution box, or distribution pipelines, and then through the distribution box or pipelines, mud be divides into each shale shaker.

GN Solids Control makes 3-panel and 4-panel shale shakers for mud processing after poor boy degasser. The shale shaker can be linear motion or dual motion. GN Solids Control also can make 3-way, 4-way and 5-way compact design distribution box for shale shaker mud distribution.

GN Solids Control, as a professional manufacturer for drilling mud solids control equipment makes different sizes of poor boy degasser. GN Solids Control makes 24 inch ID, 40 inch OD, and 42 inch OD mud gas separator to suit for all kinds of oil rig mud system.

Centrifugal pump is also named a sand pump. It is a very standard transfer device for water, oil sludge, drilling mud and other liquid flowable materials. There are many different brands of centrifugal pump manufacturer all over the world.

On oil and gas drilling field, centrifugal pump is widely used as trip pump, feeding pump for desander, desilter, mud cleaner, or decanter centrifuge. Centrifugal pump is also used a mixing pump together with mixing hopper or sharing hopper. Or used as transfer pump to transfer material from one tank to another.

GN Solids Control makes centrifugal pumps which are mainly used for oil and gas drilling, our pumps have higher material standard than others. Below are some difference of GN brand centrifugal pumps with other brands:

1) GN Pump casing and impeller are made from hard ductile iron alloy with increased abrasion resistant capability; While other brands are made from ductile iron or even gray iron. It enables a longer servicing time for drilling mud transfer.

2) GN pump is made by precision casting; It is much better than other brands which are made from sand casting.

3) GN pump skid is made from casting; while other brand skids are made from welding. And GN pump coupling cover is stainless steel, while others are carbon steel.

The casting skids provide reliable operation and less vibration in a result to extend the pump and motor life.

4) The motor brand we choose China leading manufacturer, they are also OEM of ABB motors.

Screw conveyor is the most popular transfer equipment to collect drill cuttings from solids control shale shaker, mud cleaner, and feed to vertical cuttings dryer. While using screw conveyor auger to feed for vertical cuttings dryer, normally at least 2 screw conveyor augers will be used.

Firstly, there will be a screw conveyor located in horizontal to collect drill cuttings from solids control mud system separation equipment, mostly, from shale shaker, desander, desilter and mud cleaner. After the horizontal screw conveyor, a second screw conveyor will be located inclined to transfer drilling cuttings from the horizontal screw conveyor and feed to the top feeding hopper on the top of vertical cuttings dryer.

Besides screw conveyor, Drilling cuttings transfer pump is another popular feeding device for vertical drilling cuttings dryer. Drilling cuttings transfer pump collect drill cuttings to its tank hopper, and use hydraulic power to push the drill cuttings to separation equipment, like vertical cuttings dryer, or to waste pits. But Drilling cuttings transfer pump is not self-suction pump. It can only collect drilling cuttings which can fall down into the holding tank. It cannot suction drill cuttings from waste pits.

Vacuum sludge transfer pump is another transfer pump which can feed for vertical cuttings dryer. It is a 100% air driven pump, need big air consumption. And it is a self-suction pump. Vacuum sludge transfer pump can transfer mud from solids control system, or suction material from waste pits and feed to separation equipment.

GN Solids Control can make screw conveyor, drill cuttings transfer pump, vacuum sludge pump, and vertical cuttings dryer to treat drill cuttings. Besides these equipment, GN Solids Control is capable to make other waste management equipment, like decanter centrifuge, big bowl centrifuge, high G drying shale shaker, solidification unit, dewatering unit, oil water separator, oil sludge separation system, etc…

Mud cleaner is a basic drilling mud separation equipment for various drilling activites. It is used after solids control shale shaker. Last week, Some sets of mud cleaner are ready for delivery from GN Solids Control Beijing factory.

The mud cleaners are specially designed for offshore rigs. Compared with normal onshore mud cleaner, the offshore mud cleaner with special design to suit for DNV2.1-1 lifting standard to meet offshore requestment.

Mud cleaner utilizes desander and desilter hydro cyclones to separation a certain sizes of solids phase. It is a combination of shale shaker, desander and desilter. The most popular desander cyclone is 10 inch. The 10 inch desander cone can remove particles above 47 microns. The most popular desilter cone is 4 inch. The 4 inch cone can separate solids to 27 microns. In some cases 12 inch desanter cone and 5 inch desilter cone may be used, but very few.

The hydro cyclones incorporate a precise combination of proportions, angles, ratios, and materials to optimize separation of solids from the feed material. In normal operation, feed slurry is introduced tangentially into the interior of the hydro cyclone at high velocity causing a whirlpool effect to occur inside the cone. The swirling motion of the slurry drives the larger, denser particles outward against the cone wall while the smaller, lighter particles move toward the center of the cone.

The low-pressure vortex at the center of the cone pulls in the excess liquid and small particles, as well as drawing in air through the apex at the lower discharge end of the cone. The high-velocity air stream aids the upward flow of liquid and small particles toward the cone’s upper discharge, while the spiraling stream of liquid and larger particles flows downward along the cone wall toward the lower discharge. Large solids leaving the lower discharge may be further processed for removal of remaining small particles and liquid, while the upper discharge from the hydrocyclone is often routed to desilters having 4-inch hydrocyclones for removal of finer particles.

Besides mud cleaner, GN Solids Control is capacity to make shale shaker, decanter centrifuge, mixing system, cuttings skips and other separation equipment with DNV2.7-1 lifting certificate for offshore rigs.