drilling waste management | GN Decanter Centrifuge

Q/A for GNLW Series Decanter Centrifuges

GN Solids Control, as the first API certified solids control manufacturer in China and also the leading oil and gas centrifuge producer, has a full range of centrifuge models from the 9 inch diameter bowl baby centrifuge to the 30 inch diameter bowl giant centrifuge. Each year, GN produces more than 150 sets centrifuges of different sizes and GN equipment like shale shakers, shaker screens and decanter centrifuges are sold to more than 70 countries or regions in the world.

About GN Solids Control

This Q/A are giving more information for choosing and getting a more comprehensive information of GN Centrifuges.
1. Why there are VFD for decanter centrifuge and also fixed speed available?
VFD control panel helps the operators to adjust the speed, the differential speed and other main parameters of centrifuge to get a suitable separating result. In drilling cuttings or drilling fluid waste management conditions, when the material condition is not stable, it is necessary to use a VFD one. But in case of solids control system of a drilling rig, when the mud condition is stable, a fixed speed control panel here is more economic, cause it requests less maintenance and easier operating. Take GNLW363CG for example, even the fixed speed one, GN could provide pulley and belt for an extra common speed.
2. What’s the main difference between the high speed decanter centrifuge and a middle speed decanter centrifuge? The rotating speed of centrifuge determines the cutting point the centrifuge could treat out, for example the GNLW452C decanter centrifuge, with a typical speed at 1800RPM is mainly used in a solids control system for barite recovery, the cutting point is 5 to 7 microns, while the GNLW453C-VFD with a typical speed of 3000RPM, which is a high speed one, cutting point is 2-5 microns.
3. What’s the difference between longer centrifuge and shorter centrifuge? The length diameter ratio is an important factor of a centrifuge. The longer centrifuge is a centrifuge with a larger length diameter ratio. The bigger this value is, the longer time material stays in centrifuge, then the dryer separating result you could get.
For more information, welcome to visit GN website of contact GN sales directly.

GN Big Bowl Centrifuge Working With Large Capacity

Since early this year in CIPPE Beijing, GN Solids Control firstly showed its big bowl decanter centrifuge GNLW764-VFD, the super bowl decanter centrifuge with a diameter of up to 30 inches, this centrifuge model got lots of attentions from the end users, especially from the construction work and piling projects. The large capacity and excellent performance is exactly what they want.

The big bowl centrifuge GNLW764-VFD has following features:
1. With a bowl of 7650mm long, while 3344mm as a bowl diameter, GNLW764 is promised to have a large treating capacity in order to be suitable for many applications.
2. Because for the large length diameter ratio, which is up to 4.4 and also a G force at 3000G by high speed rotating, this centrifuge could give a for a perfect separation result, a clearer Liquid phase after treatment.
3. Just as all centrifuge models GN provides, the liquid discharge port is easy to adjust. It helps operator to get a suitable dryness fraction by adjusting rotation speed, differential speed and liquid discharge ports.
4. Stable performance：all rotating part of the centrifuge are fabricated by five-axis machine, and well dynamic balancing tested at high speed to ensure a precise fabrication. Besides, theis model is also functioned with automatic lubrication.
5. Heavy load：GN employs a gearbox with 25000N.M torque for GNLW764-VFD for handling heavy load conditions.
6. Long service life：bowl material is duplex stainless steel SS2304 by centrifugal casting, YG8 hard tiles for impeller protection, and also YG8 material for liquid discharge ports and solids discharge ports. Genuine SKF bearings are used in order to ensure a longer service life.
7. Easy operation：with PLC smart control system，HMI visual operating screen, the operator can observe the on time working condition of the centrifuge. By adding more devices onto the centrifuge like temperature protection for bearings, vibration protection, overload protection and current monitor are all equipped fo this centrifuge, for a more convenient operation.

GN Big Bowl Centrifuge Successfully Used for Railway Construction Project

Centrifuges are equipment with high efficiency and various applications. Centrifuges with different sizes are used for different applications.

Like among the GN Solids Control’s centrifuge models, the fixed speed 14 inch diameter bowl GNLW363 series centrifuges and GNLW452 decanter centrifuge with 18 inch diameter bowl are widely used for the oil and gas drilling solids control systems for the barite recovery. The VFD controlled GNLW363G, GNLW453 and GNLW553 series decanter centrifuges are used for the drilling cuttings waste management when working with a GN high G drying shaker or a GN Vertical cuttings dryer which are respectively for WBM and OBM and drilling fluids treatment projects, when working together with a chemical dosing system. GNLW223 and GNLW224 decanter centrifuges are mostly used for the diamond drilling projects and some projects with small treating capacities.
GNLW764 decanter centrifuge is a newly designed decanter centrifuge with a 30 inch big bowl, and a length bowl ratio as large as 4. It is specially designed for the big TBM projects, working after the shale shaker and desander plant. In some clients’ jobsite, there are 2 parallel desander units, each including one GNZS594 shale shaker and a GNZS594-2S12N mud cleaner. All fluids after treated by the 2 desander unit are transferred to the giant decanter centrifuge. On inlet of decanter centrifuge, there is a set of GNDW2000 Dewatering unit, it is used for chemical dosing for the centrifuge. It has 3 chambers for adding different chemicals for flocculating the extra fine particles into bigger ones, in order to be separated out by the centrifuge. Although after flocculation, the decanter centrifuge’s treating capacity is greatly reduced, GNLW764 could still handle a large capacity upto 90 cbm per hour.
Except for the giant centrifuge, other sections of the system are all designed into 20 ft containers. Even the shaker and mud cleaner are in frames with container corners. It is easy for transportation and layout.
If you need more information, welcome to contact GN Sales team directly.

How and Why to Choose a Suitable Drilling Cuttings Waste Management System for OBM

By using an efficient solution of the drilling cuttings waste management system and treat the solids well, the particles could be dryer and even reach the standards to be discharged, meanwhile, the expensive drilling fluids could be collected and put back to the drilling system.

GN DRILLING CUTTINGS WASTE MANAGEMENT EQUIPMENT

Ever since year 2013 when GN Solids Control firstly designed and put into reality the GNCD930 series cuttings dryer, GN has designed 2 kinds of drilling cuttings treating system, both combined by following equipment:
1. GNCD930 vertical cuttings dryer. It is like a drying step of a washing machine, by high speed vertical drying, the liquid phase, drilling fluid passes the mesh of the cone sized basket, while the solids phase, the cuttings, fall down to the discharge port. After treatment of GNCD930, the OCC could be less than 5%. And according to different cuttings condition, GN gives 3 optional mesh opening sizes. Clients could prepare all of the three for different conditions.
GNCD930 Vertical cuttings dryers are firstly designed for the OBM and SBM, but per some clients’ feedback, it could be useful for some water based mud, too.

2. After the GNCD930 vertical cuttings dryer, the drilling cuttings are collected while the drilling fluid falls into a container and to be pumped to next step, the GNLW363 series decanter centrifuges. GNLW363 series decanter centrifuges are the super star among GN centrifuge models. In every 10 sets of GN Centrifuges, 7 are GNLW363 decanter centrifuges. It has the medium size and more optional control panels for option. In solids control system, clients always choose fixed speed GNLW363, while in drilling cuttings waste management or drilling fluid treatment project, the VFD model with PLC control panels are more popular. In some none explosive conditions, clients could choose the more economic model, while in some countries and regions when IECEX or ATEX is a must, GN also have those models for option.

3. GNSC series screw conveyors. By providing screw conveyors of different diameters and length, GN has 12 models for option. Clients could choose per the transporting capacity and distance to be transported.

Small Mud Recycling System for Diamond Core Drilling

Diamond core drilling is one kind of drilling project which is similar with some small HDD or TBM drilling. But comparing with HDD or TBM drilling, although the requested capacity of the diamond core drilling is smaller, the separation standard is even higher.

core drilling mud system — GN compact solids removal unit

GN Solids Control has some mature solutions for such kind of drillings, and GN Solids Control has a group of compact designed separating equipment to serve in this system. This system is combined by a small shale shaker and a baby centrifuge, which are the most efficient separation equipments, and the cutting point could reach 2 to 5 microns. Besides the separation equipment, this system has a mixing unit also, which is used for adding more components into the system.
In this system, following equipment are included:

1. GNZS752E-DM shale shaker. This is a small shale shaker, suitable for the small capacity applications like the diamond core drilling. It has 2 pieces of shaker screens, with a screen area of only 1.35 cbm, only larger than half of GN normal shakers. But this capacity and mud routine is enough for the small projects. GN has a shaker screen factory for making composite material frame screens for this shaker model.

2. GNLW223-VFD decanter centrifuge. It is the smallest decanter centrifuge among GN centrifuge models. The bowl diameter of GNLW223 is only 9 inch, but the rotating speed could reach 4200RMP as normal operating speed.

3. Jet mixing hoppers for the mixing unit.

4. A tank for housing those above mentioned equipment and for receiving the liquid discharged from the equipment.

5. Centrifugal pumps respectively for feeding the decanter centrifuge and the mixing unit. GN centrifugal pumps are fully interchangeable with NOV Mission pump in both installation dimensions and spare parts.
Besides being used to the diamond core drilling projects, it is also used for some small HDD projects. For more information, pls contact GN Sales team.