Oily sludge separation system to treat drilling cuttings in Uganda
GN Solids Control is a leading manufacturer on drilling rig mud solids control system, drilling cuttings treatment system, and oily sludge separation system. GN Solids Control is a private company without any government background. GN Solids Control main market is international market. Its solids control equipment and drilling waste management equipment have been exported to 74 countries and regions till now.
China National Offshore Oil Corporation ("CNOOC") is the largest offshore oil & gas producer in China. CNOOC is a state-owned company operating directly under the State-owned Assets Supervision and Administration Commission of the State Council of the People's Republic of China.
In year 2016, GN Solids Control offered an oily sludge separation system for CNOOC. The project destination is Uganda in Africa. GN Solids Control offered a turnkey solution for the drilling cuttings treatment project of CNOOC. Till now, the system have been running for 1 year. Per feedback from jobsite, the performance is good, CNOOC are very happy with the system.
The oily sludge separation system for drilling cuttings treatment is including below unit:
1) Automatic drilling cuttings taking unit: The unit includes portal crane, Submerged slurry pump, high pressure gun and supporting skids. It is used to transfer cuttings from the drilling cuttings pit to
2) Automatic drilling cuttings transfer unit: The unit includes high pressure washing system, V-hopper, screw conveyer, material tank and a skid for all above items.
3) Drilling cuttings shearing and separation unit: the unit includes following items: shear pump, high G shale shaker, surging tanks, transfer pump and a skid for all above items.
4) High speed solids washing system: this unit including a washing tank, mud agitator, transfer pump, high speed decanter centrifuge, automatic chemical dosing system, etc…
5) Ultrasonic oil-water separation system. This system is used to get clean water and oil. And there will be transfer pumps for the recovered oil and water.
1-skid cuttings drying system for oil base and water mud cuttings to South America
2 full sets cutting drying system will be finished soon and will be dispatched to South America. The drying system can be used to treat both oil base mud cuttings, as well as water based mud cuttings.
The cuttings drying system for South America client is customized per client’s request. The client purchases from GN for many years. They owns many of GN equipment, especially decanter centrifuges, they have over 10 sets different models of GN decanter centrifuge, for both drilling rig solids control system and drilling waste cuttings treatment system. As the client said, all GN equipment works well so far. That is why they continue order new systems from GN. This time, the client ordered the 1-skid cuttings drying systems. They want the systems to help them expend their business. 
The system is including following equipment:
1) GNCD930D vertical cuttings dryer. The GN Vertical Cutting Dryer uses centrifugal force to dry drilled solids in oil or synthetic base fluids. A stainless steel screen bowl traps “wet” solids and accelerates them up 900RPM with G force to 420G or super high speed 1200RPM with G force to 750G The can reduce oil on cuttings to 3% or 5%. 3% ~ 5% oil on cuttings is the discharge requirement in most countries.
2) Linear motion High G Force Drying shaker GNZS594HGE-LD. 
GN high G shaker is designed for primary solids control separation, as well as drying the cuttings from the primary solids control equipments, recover silts and ultra-fine sands, provide solids in a consistently stackable and conveyable form and requires no expensive chemicals or polymers. GN high G drying Shaker with Adjustable G force Up to 8.0 G.
3) High speed decanter centrifuge GNLW336CG-VFD. The high speed centrifuge is used to remove ultra fine solids from the recovered liquid from high G shaker or decanter centrifuges.
1-skid cuttings drying system is equipped with both VG dryer and high G dryer, jobsite operators can choose the suitable separation equipment per his jobsite condition.
High quality decanter centrifuge for Oil field
World famous brand - GN Solids Control makes high quality decanter centrifuge with different size for oil and gas drilling field.
Below are some of the different applications of GN high quality decanter centrifuge in oil and gas drilling field:
1) GN high quality decanter centrifuge can be used after shale shaker, desander and desilter for barite recovery. The function is to recovery the valuable barite from the drilling fluids for reuse. And reduce the mud weight to make it qualified for drilling activities.
Recommended model for barite recovery application is GNLW452 series. It is middle speed big bowl centrifuge. It is with 18’’ bowl and with a single motor middle speed. The normal standard is fixed speed control for GNLW452 series centrifuge. GN also offers VFD control for GNLW452 centrifuge.
2) GN high quality decanter centrifuge can be used to remove the ultra fine solids and reduce the weight of the mud. Hydro cyclone separators can only move solids above 30 microns. And middle speed centrifuge can remove solids above 5 ~ 7 microns. And they are not D100 (100%) separator. After some circulations, the fines solids content will be higher and higher. The drilling fluids will be very heavy and not suitable for drilling activities. High speed centrifuge can be used to remove the fine solids around 2~5 microns to reduce the mud weight.
GNLW363 series is a classic 14’’ centrifuge widely used for fine solids separation. GN offers mechanical speed changing and the automatically speed changing. Clients can choose fixed speed control and changing the pulley and belt to change speed. Clients can choose VFD speed control to get a more wide speed and differential speed scope.
3) Compared with 14’’ centrifuge, 18’’ centrifuge and 22’’ are worked as big bowl for big volume at the oil and gas drilling field.
Recommend bi bowl centrifuges of big bowl from GN Solids Control: GNLW452, GNLW453, GNLW553. For more details and applications of GN high quality decanter centrifuge, welcome you contract GN group freely.