GN oilfield decanter centrifuges can be used in different applications for handling drilling mud for solids control and drilling waste management.

How to set up bowl speed for decanter centrifuge for drilling mud?

Take GNLW363 serires decanter cantrifuge for examsple, operator can set up the decanter centrifuge speed as following, it can used for following application:

PLC Decanter Centrifuge Speed

• Barite Recovery: Operator can run the centrifuge with G foce at range from 700-1000 G, and run the 14 inch decanter centrifuge at speed around 2000 RPM.
• High Gravity Solids(HGS) Separation:Operator can run the centrifuge with G foce at range from 1000-2000 G, and run the 14 inch decanter centrifuge at speed around 2500 RPM.
• Low Gravity Solids(LGS) Separation:Operator can run the decanter centrifuge with G foce at range from 1800-2300 G, and run the 14 inch decanter centrifuge at speed around 3000 RPM.

How to asjust the speed for decanter centrifuge?

The method to set up bowl speed for decanter centrifuge normally have three ways, one is to USE the VFD control system to adjust the frequency for the motors to control the speed for the decanter centrifuge, second is to use Hydraulic driven system to adjust the bowl speed and differential speed.Third, to change the centrifuge speed is to use different sizes of pulley and belt to change the speed.

GN offers decanter centrifuge for all above types to allow users to use the decanter centrifuges for different applications.

Decanter Centrifuge Feeding Pump speed and capacity.

To feed the GN 14 inch GNLW363 Decanter centrifuge, normaly we recommend to use GNG30-7.5 screw pump.The GNG30-7.5 screw pump is a positive displacement single screw pump, the capacity of the pump depends on the speed or the motor, the motor transfer the speed thru gearbox to the pump.  For example, the ration of the Screw pump is 6/1 so if the pump motor run at 60HZ, that means the motor run at 1750RPM and the pump will run at 291RPM. And if the decanter centrifuge feeding pump run at 291 RPM with capacity at 30m³/h. And if adjust the VFD to run at 30HZ, the pump speed will be half capacity, around 15m³/h.

GN TBM Slurry separation equipment are optimally adapted to the requirements of the tunnelling (TBM) process and separate the drilling suspension completely from the solid particles consisting of gravel, stone and sand in various grain sizes. A powerful combination different solids control equipment of state-of-the-art shale shaker technology and Hydro cyclones with high g-forces results in deposit able excavated material.

micro tunnelling tbm slurry separation system

GN Solids control manufacture all major solids control equipment for the TBM Slurry separation system including following:

• TBM Slurry separation Shale Shakers for coarse solids separation.

• TBM Slurry separation desander and desilters for desanding and desilting separation.

• Big bowl big volume decanting centrifuge for fine solids separation.

• Centrifugal slurry pump for feeding to the separation equipment.

• Mixing hoppers for bentonite mud mixing.

• Mud tanks for storage drilling mud Continue reading →

Solids Control Unit for Civil and Underground Industry

• Drilling mud Solids Control systems – This industry involves horizontal directional drilling rigs and Micro tunneling rigs which require it to be equipped with drilling solids control systems. So we can sell the mud solids control system package to the drilling rig manufacturer, and underground drilling contractors as well as the mud service companies who do service for the drilling contractor.
  

  Solids Control Unit Mining

For this industry, we have two major advantages, first, we can do customized design with competitive pricing as required by customer. We also service the untapped civil and underground industry  with solids control equipment whereas our competitors in America may focus only on the oil gas industry, or only have prefabricated models for the customer, who will only  customized design at very high extra costs.

Mining industry Solids Control unit

• Solids Control system –  During the exploration of the mines by drilling, the drilling contractor will need to use a mud recycling system to clean the drilling fluids and reuse the drilling fluids. Especially for diamond drilling customer, they need compact mud systems to clean drilling fluid and to separate very fine solids.

• Small compact solids control equipment – Many companies have ignored this industry, so they did not design small compact equipment like mini shakers, mini solids control decanter centrifuge to fit this industry.

Even if our competitors have the mini solids control equipment, as they are very big companies who are not willing to make the complete customized package for the customer, like we do. GN Solids Control have already done many project for this industry in Australia, Asia and Canada which has a huge demand for such mining exploration solids control equipment for diamond drilling.

Separating solids from liquids plays a key role in oil drilling mud recycling. Decanter centrifugal separator from GN Solids Control plays this crucial function exceptionally well. The working performance is strongly related with the working principle. So how it works?

In order to understand this, we need to define what is decanter centrifugal separator.  Decanter centrifugal separator also can be named short as Decanter centrifuge or centrifuge. The most common model is vertical, horizontal and conveyor centrifuges. The principle behind a decanter centrifuge is based on the theory of gravitational separation. For example, if you fill a glass with a mixture of mud and water, over time the weight of the mud will cause it to settle down at the base of the glass. With the mud congealed at the bottom, the water will be forced upwards, creating a clear separation between the two. However, unlike the glass mixture, the process is expedited through the use of continuous rotation. In fact, rotation provides anywhere from 1000 to 4000 times the normal gravitational force, reducing the time required for separation from hours to seconds.

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Decanter centrifuge has many kinds, classified as speed, it has high speed, middle speed, low speed; classified by drive type, it has belt drive, fully hydraulic drive and magnetic drive; classified by manufacturers, it has GN Solids Control. The former 3 brand are U.S. brand and the last one is China brand. The only China brand can compare with U.S. brand.

Hereunder, we listed some middle speed centrifuge which is popular used for weighted drilling mud barite recovery, overseas and domestic market.

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Centrifuge uses high-G force to separate fine solids from liquid. It can be used to process weighted and unweighted, oil based and water based drilling mud. Popular centrifuge manufacturer like Derrick, Swaco and NOV brandt are US brand. Here introduce a China popular brand, GN Solids Control.

Let’s compare GN Solids with NOV Brandt centrifuge hereunder:

1. NOV Brandt centrifuge, HS-2171L centrifuge

The HS-2172L centrifuge is fed from the solids end of the conveyor. Mud is introduced into the feed chamber of the HS-2172L through a feed tube and, with the aid of a concave accelerator, exits through twelve (12) nozzles into the bowl.

The HS-2172L is equipped with variable frequency drive (VFD) control, which provides a controlled application of motor drive power to the centrifuge components (bowl, conveyor and feed pump). Customized hardware and software packages can be designed to meet specific installation and operational requirements. With a processing capacity of up to 550 gal/min (2082 lit/min), the HS-2172 series centrifuge is able to quickly process high volumes of mud while allowing prescribed mud weights and separation efficiency to be maintained. This enables the HS-2172 series centrifuge to produce fine cut points at higher flow rates, making it ideal for high-flow applications and critical-conditions solids control.

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ADIPEC 2013, Abu Dhabi oil show is the largest oil show in Middle East area. It has a large influence in oil and gas field, especially for companies from Middle East and North Africa. This month, GN Solids Control Co., Ltd attend the show with there high speed centrifuge, GNLW363VFD. This centrifuge is the best seller in Middle East and North Africa.

1. GN customer around the world, using GNLW363VFD.

This centrifuge has a stable working performance and also good reputation from the customer. Now it has been used in Iran, Iraq, Kuwait, UAE, Egypt, Lybia, Nigeria, Tunisia, Argentina, Brazil, America, India etc, over 60 countries and areas.

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Tunisia is a country located in North Africa. As an export-oriented country, the majority of the electricity used in Tunisia is produced locally. Oil production of Tunisia is about 97,600 barrels per day. That means this country has many drilling works under going.

GN Solids has already established links with many Tunisia national drilling company and Tunisia national mud Service Company. Only this year, they have exported many sets of solid control equipment and waste management equipment to Tunisia.

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There are many pumps need to be used for solid control system, like centrifugal pump, submersible slurry pump, shear pump, screw pump etc. The pump is accessory equipment to solid control system, not main equipment, but also necessary for your smooth job. If the pump quality is not reliable, you may find many troubles during the work.

GN Solids Control Co., Ltd. is the first API and ISO certified solid control equipment manufacturer from China. Their equipment is widely used in many areas of the world. The reliable product quality and nice service win good reputation for them. Hereunder, we see one importance pump, shear pump in all perspective.

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Hereunder, we want to introduce a kind of equipment connected solid control system and waste management system. It is screw conveyor, or name it auger. It is utilized to transfer solid waste or slurry from solids control system (including shale shaker, mud cleaner or centrifuge) to drilling waste systems for further treatment.

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