Nov 21

In last blog, we introduced the shale shaker and mud cleaner in a compact mud recycling system produced by GN Solids Control for the SINOPEC. In this system, there are in all 4 steps of separation, with the first step as shale shaker, second step as the mud cleaner with 1 of 10 inch desander cone and 8 of 4 inch sized desilter cones. The dewatering centrifuge is the fourth step separation for the fine particles left in the liquid.

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Why need a decanter centrifuge?
Till now, the decanter centrifuge is a second to none choice for choosing out the particles in the drilling mud between 2 to 5 microns. Even for finer particles, the decanter centrifuge can handle them by adopting a chemical dosing or so called flocculating unit.

How to choose a suitable centrifuge?
1. First of all, to choose a suitable size of centrifuge, the diameter of a centrifuge determines the treating capacity of a centrifuge. In this project, the end user chose GNLW363-VFD, with a 14 inch bowl diameter while the speed is typically 3200RPM, which is quite popular in drilling solids control and drilling waste management applications. Besides this most popular model, GN has centrifuges from small size as 9 inch bowl to big size up to 30 inch diameter bowl.
2. The centrifuge bowl diameter ratio determines the particle size to be separated out, for example, the longer centrifuge is, the dryer solids come out. Among GNLW centrifuge models, there are bowl length diameter ratios for option from 2 to 4.
3. And the higher speed a centrifuge has, the finer particles to be separated out. Per different speeds’ range, there are middle speed centrifuge and high speed centrifuge. Normally a middle speed means around 1800RPM, for example as the big bowl centrifuge GNLW452, with a typical speed as 1800RPM, and a bowl of 18 inch diameter, which is mostly used for barite recovering in a solids control system.

Welcome to send your project information to GN for more professional suggestions.

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written by shale shaker

Oct 27

Last week, one international contactor for mining industry started their project in Australia, among the separation line, two green colored equipment were significantly shown. They are big bowl centrifuges from GN Solids Control, a leading manufacturer for industrial separating equipment manufacturer based in China.

GN Solids Control has been designing and producing the separating equipment like shale shakers, mud cleaners, decanter centrifuges, vertical cuttings dryers for many years. At first, the equipment are mainly used for the oil and gas drilling solids control systems, and later, as GN’s quickly increasing development of technology and producing capability, GN Solids Control has enlarged its centrifuge model range from 14 inch bowl to bigger ones and smaller ones. Those 2 sets of GNLW764A decanter centrifuges are till now the biggest sized centrifuges made by GN Solids Control, with a bowl diameter of 30 inch and a treating capacity up to 120cbm/hr.

Besides the giant bowl decanter centrifuge GNLW764A-VFD, GN Solids Control has various centrifuge models with size as small as 9 inch diameter bowl, up to 30 inch diameter bowl, including the 14 inch bowl , 18 inch bowl, 22 inch bowl and etc.

GNLW764

For each size, there are different models available per different bowl length diameter ratios. Normally the comparably longer bowl a centrifuge has, a cleaner separation result it could give. Among GNLW series decanter centrifuges, take the 18 inch bowl diameter as example, there are different ratios like 2, 3 and 4. GNLW452 is a stout shaped decanter centrifuge with middle speed and shorter bowl, which is mostly used for barite recovery in a solids control system based on the barite size and gravity. GNLW453 is a high speed centrifuge for waste management systems, or as the dewatering centrifuge, for fine particles. While the GNLW454 is quite suitable for waste water separation with a longer bowl up to 4 times of bowl diameter, around 61 inches.

GNLW764, the 30 inch bowl diameter centrifuge has a bowl length-diameter up to 4. And this giant could separate quite fine particles at a large capacity, even after a dewatering unit.

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written by shale shaker \\ tags: , ,

Jun 26

Centrifuges are quite popular in separation industries, in oil and gas solids control, in drilling cuttings waste management, and in oily sludge separation projects. It is perfect solution for separating out particles from 2 microns to 5 microns. The centrifuges are playing more and more important role. But still, it is more difficult to operate the centrifuge well and let the centrifuge to work more efficiently.

GN HIGH SPEED CENTRIFUGE WITH SKID

GN HIGH SPEED CENTRIFUGE WITH SKID

There are some suggestions to help improving the centrifuges’ performance:
1. Before using the decanter centrifuge, make sure the material which enters the centrifuge are not so big for the centrifuges, in order to avoid blocking of centrifuges. For instance, a high speed centrifuge is capable to separate out particles from 2 microns to 5 microns. In practice, particles no larger than 2mm could enter the centrifuges. So it is suggested to use a shaker unit before the centrifuge.
2. How about when the particles are too small? When there are so many extra fine particles, it would be difficult for the centrifuge to separate the particles out. In this case, a chemical dosing unit is invited before the centrifuge. By adding flocculant into the material, the extra particles flocculate into bigger ones in order to be separated by centrifuge.
3. If the material is of too high viscosity, some polymers fed by the chemical dosing unit into the material, to lower down the viscosity. Then the separation result would be much enhanced.
4. Confirm the material content before choosing a suitable bowl rotating speed and a suitable differential speed. The material content information includes: solids content percentage, the distribution of each particle size, and etc. Such information helps the operator to adjust the centrifuge parameters.
GN Solids Control is quite professional in centrifuge design and manufacturing, GN centrifuge sizes range from 9 inch bowl to 30 inch bowl. Pls contact GN for consultancy.

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written by shale shaker \\ tags: , ,

Mar 23

Drilling waste management is one of the core system GN Solids Control produces, it includes the drilling cuttings separation and also the drilling fluids separation. Dewatering unit, which is also called chemical dosing unit is one of the important components of the drilling fluid treatment systems.

GN dewatering jobiste

GN dewatering jobiste

In some countries and regions, it is a must that a drilling rig must be accompanied with a dewatering unit and a dewatering centrifuge, for one thing, more drilling mud could be recycled, which means to reduce the cost and save money. For another thing, it is reducing the harmful components to be discharged to the soil or environment, it helps to protect the surroundings.

GN Solids Control has been providing the dewatering unit for many years, and the dewatering unit now are more and more widely used for different applications, such as:

1. Oil and gas drilling fluids separation. After being used for a certain time, there are more and more extra fine particles in the drilling fluids, even too fine to be separated out by a centrifuge. By adding some chemicals into the fluid, the extra fine particles flocculate into bigger ones to be separated out by centrifuge.

2. In TBM, Piling and other projects, when the slurry is of higher viscosity or need to be added with some chemicals, the dewatering unit is playing an important role, just as shown in the picture, the treatment was successful.

3. In oily sludge separation projects, the added chemicals helps to separate the oil from the cuttings, which greatly increase the efficiency of centrifuge and oil water separator.

GNLW Series decanter centrifuge, especially GNLW363G-VFD, GNLW553-VFD centrifuges are always ideal choice for working together with dewatering unit. Besides those models, GN also has centrifuges with bigger length-diameter ratio for clearer separation.

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written by shale shaker \\ tags: , , , , ,

Dec 12

Recently, GN has produced for 2 different clients who worked for similar projects, with following equipment and solutions:
1. GN big bowl 22 inch diameter decanter centrifuges.
2. GN chemical dosing unit
3. GN standard containers.

GN CONTAINERIZED CENTRIFUGE AND DEWATERING

GN has been providing this design for many years, and the technology is quite mature:
1. GNDU2000 Chemical dosing unit. GN has been providing the chemical dosing unit or so called the dewatering unit for many years, since some of GN clients are using GN centrifuges as dewatering centrifuges and prefer GN to make compact design for them. A chemical dosing unit is used to treat the material by some chemical methods, for example, to add some material to reduce the viscosity of material, or to flocculate the extra fine particles into larger ones, which are suitable for centrifuge use.
2. GNLW553C-VFD decanter centrifuge is a big bowl decanter centrifuge with a treating capacity up t to 90 cbm per hour, and the rotating speed could reach 3000 rpm. It is quite suitable for drilling liquid management, especially being used together with chemical dosing system. Normally, the centrifuge treating capacity for material after flocculation would be greatly reduced, that’s why a big bowl centrifuge with a large treating capacity is always used for this application.
3. 20 ft containers for housing the centrifuge and chemical dosing system, which is quite popular design. For one thing, it is more convenient and easy to transport the system when the main equipment are in standard containers. Secondly, the containers give a shield to the equipment, providing a suitable temperature and clean condition. Thirdly, the 2 sets of 20 ft containers could be put one under another, in this way, less room to be occupied.
In this design, GN engineers designed the round shaped ladders for the upper located container with the big bowl decanter centrifuge, when transporting, the ladder could be put into the container.

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written by shale shaker \\ tags: , ,

Jul 11

Per experiences and calculated data, the drilling liquid occupies in any well drilling is between 4 percentage to 10 percentages, no matter in onshore drillings or offshore drillings. Considering its effects on the drilling operation performance, which occupies nearly 50 percentages, the drilling fluid is quite vital to the drilling.

GN Waste Management Equipment

That’s why, a professional drilling manager has to have a professional team for the drilling mud services, or find a qualified drilling fluid service company. In practice, drilling companies or drilling contractors always focus on drilling work, and employing a subcontractor for the solids control system. Each drilling rig has eight systems connected to each other, among which, the solids control system is comparably independent. An expertized drilling fluid company has the right personnel and suitable equipment, and more important, they know how to treat the fluid well.

A professional oil service companies provide following services:
1. Solids control equipment and services. The solids control systems help to treat the drilling fluid directly from the well mouth. It contains three or four phases for separation, including the shale shaker as the first phase, the desander cones as the second phase, the desilter cones as the third. Some include the decanter centrifuge as the forth one. In most solids control systems, there are mixing unit for adding more chemicals into the fluid when necessary.
2. Drilling cuttings waste management systems, in some countries, this part is also regarded as a part of solids control, because this is also for treating the solids from the drilling fluid. Those systems always contains the vertical cuttings dryer, the high G drying shaker and the decanter centrifuge.
3. Drilling fluid waste management, it is the further treatment for the drilling fluid. As the fluid has been used for a long time, this system uses some chemicals to flocculate the extra fine particles into larger ones before being separated out by a decanter centrifuge.
As one of the leading manufacturers of solids control and waste management, GN Solids Control has been providing lots of oil service companies in the world for all above mentioned systems and equipment. For more information or a formal quotation, welcome to contact GN directly.

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written by shale shaker \\ tags: , , , ,