Drilling Mud Recycling System

As a manufacturer of decanter centrifuge in China, GN solids control can produce different types decanter centrifuge for many different applications, including oil and gas industry used VFD decanter centrifuge and full hydraulic drive decanter centrifuge, rated speed decanter centrifuge, which can be used for drilling fluids solids control centrifuge, drilling waste treatment centrifuge, oil sludge treatment centrifuge, mud dewatering centrifuge; and industrial waste water treatment decanter centrifuge. Especially for VFD decanter centrifuge and full hydraulic drive decanter centrifuge, they are the most popular decanter centrifuges.

The centrifuge bowl assy is same for the VFD decanter centrifuge and full hydraulic drive decanter centrifuge, the difference between them are motor power and drive system.
Simply speaking, VFD decanter centrifuge is drived by VFD control panel, mostly the VFD control panel is positive pressurized, we can provide CNEX, ATEX, IEC EX based on different client’s requirement, and the suitable ambient temperature from -20℃ to + 40℃ or +55 ℃. Take GNLW363C-VFD decanter centrifuge as example, the main motor power is 50HP, the back drive motor power is 15HP, the feeding pump motor is normally 10HP, sometimes use submersible slurry pump, it is 7.5HP. The VFD decanter centrifuge will be lay on the telescopic skid directly or on top of mud tank with support leg.

Full Hydraulic Drive decanter centrifuge is drived by VISCOTHERM Full hydraulic drive system, The advantage of the FHD centrifuge is for use in high temperature ambient for heavy mud with flexible bowl
and differential speed. The compact one skid design makes it easier for rig up. Take GNLW363-FHD decanter centrifuge for example, the main motor power is 45KW, the electric control with PLC smart control, The torque gearbox is up to 4163 N.M (3260 ft.lbs)for heavy mud separation.
If you need VFD or Full Hydraulic Drive decanter centrifuge, pls contact with GN solids control.

Recently one batch of vertical cuttings dryer and solids control centrifuge are ready for shipment to oversea client, the equipments list including:

2. GNLW363CG solids control centrifuge, 4 units
3. Vertical cuttings dryer GNCD930G, 1 unit
4. Screw conveyor , 6 units, 2 units can be used to collect the drilling waste from primary shale shaker, 1 unit screw conveyor can be used to collect the discharged solids from vertical cuttings dryer and transfer to the skips.
5. Decanter centrifuge feeding pump, 4 units, which are single screw pump, brand Netzsch, the client can outsource the wear parts locally if urgently required. The pump flow rate can be easily adjusted by the touch screen on the VFD control panel of the decanter centrifuge.
   The client will make the telescopic skid or tank skid locally according to their rig schedule. It is recommend to treat the fresh oil based drilling waste from primary shale shaker( in the solids control system) by the vertical cuttings dryer system, the ideal result is to reduce the oil content on the cuttings below 5%, sometimes it is even reduced to 3.7% in some rigs. But when the drilling waste have been storage for a long time or it has been transported by trucks from rig site to waste treatment facility and storage in an open air area, it has contacted with water in the air or rainy water and the water content is higher than before, the waste shape has changed to very sticky material and it is hard to separate than before, then the treatment result by the vertical cuttings dryer will become worse, so we suggest to our users not to storage the waste for too long, the earlier to treat it, the better result to reach.
   If you need a drilling waste management equipments, pls contact with GN solids control.

Recently three sets of oil rig drilling waste management equipments are ready for inspection for Nigeria Drilling Company, the equipments list are as below:

1. Decanter Centrifuge GNLW363C-VFD, 6 sets
2. Vertical cuttings dryer GNCD930F-VFD, 3 sets
3. GNLW363C-ZJ telescopic skid, 6 sets
4. GNCD930F-ZJ telescopic skid, 3 sets
5. screw conveyor to transfer the drilling waste and discharged solids
6. screw pump, 9 units This is the repeat order from this client, they already purchased many sets of drilling waste management equipments in the past years, including decanter centrifuge with its telescopic skid, vertical cuttings dryer with its telescopic skid, screw conveyor with control panel, screw pump ( as decanter centrifuge feeding pump and vertical cuttings dryer flushing pump). The equipments will be inspected strictly and shipped to Nigeria. The models are remained the same during the past years, the client always use the same model for convenient operation, maintenance and stock spare parts. We keep improving our decanter centrifuge and
   Vertical cuttings dryer design according to client’s feedback, to make it more user friendly and better performance. We can make all the equipments in one skid for compact design and convenient transportation, also we can make the decanter centrifuge and vertical cuttings dryer in separate telescopic skid for flexible installation, the client can use them for different project according to their drilling plan.
   The screw conveyor made by GN solids control is U type continuous conveying equipment without flexible traction. The standard length for each section is 12ft, we have option for 1 section 12ft, 2 section 24ft, 3 sections 36 ft, 4 sections 48 ft. the screw diameter with option of 10 inch, 12 inch, 14 inch, 16 inch, 18 inch. The screw speed is 50~60 rpm.
   If you need customized drilling waste management system, pls contact with GN solids control.

Recently one set of 35000bbl liquid mud plant are shipped to international drilling fluids service company, this liquid mud plant including the modular as below:

1. Solids control system modular: including 1 set of drilling fluids processing tank, with 1 unit shale shaker GNZS594F, 1 unit middle speed decanter centrifuge GNLW452D for barite recovery, 1 unit of GNLW363C high speed decanter centrifuge to separate low gravity solids, mud agitator, mud gun, with electric control system, tank handrails, walkway and stairs, also with a 110HP charging pump with soft starter.
2. Mixing tank modular, including 2 units of mud mixing tank, with 4 units of 100HP mixing pump with 4ea customized dust free hopper, mud agitator, 8 units of mud gun, also with electric control system, tank handrails, walkway and stairs, and two units of 110HP charging pump with soft starter.
3. Storage tank modular: 500bbl (80m3) vertical storage tank 70 units, total capacity 35000bbl. It can be used to storage water based drilling mud, oil based drilling mud, Synthetic Oil Based Mud, crude oil, brine water, etc. Each storage tank with its own handrails, there is walkway between 2 tanks, each line with long walkway, each tank at corners with its stairs, and each line of storage tank with its charging pump for suction and discharge, each line with its pipelines.
   If required by the user, we can also provide drilling waste management system which can be connected with the mud processing tank, to collect the oil based drilling cuttings from shale shaker and transfer to vertical cuttings dryer, to separate the solids from drilling fluids, the discharged solids result can reach oil content in the cuttings around 5%. The drilling fluids can back to mud processing tank and treated by decanter centrifuge again, as a closed loop circulation system.

One batch of drilling waste treatment equipments are successfully used for international oilfield service company. The equipments list including:

1. GNZS594F-SGZF High G drying shaker
2. GNCD930F-VFD vertical cuttings dryer
3. GNSC12B-24 & GNSC14B-48 screw conveyor
4. Support skid for vertical cuttings dryer and high G drying shaker
5. GNLW363C-VFD decanter centrifuge
   For a standard drilling waste treatment system, normally we will use decanter centrifuge and vertical cuttings dryer, sometimes when solids content of the fine solids smaller than 0.35mm is very high, the client will use the high G drying shaker to reduce the solids content firstly before feeding to decanter centrifuge, otherwise the high solids content will be easily block the centrifuge bowl. For vertical cuttings dryer screen basket screen opening, we have 0.5mm, 0.35mm and 0.25mm for option, we suggest the user to select 0.35mm or 0.5mm screen opening, for smallest screen opening, the screen basket will be blocked very frequently and the treatment result can not meet the expected result. For the treated fluids will flow to high G drying shaker buffer box, and flow to shaker screens evenly, by using very fine mesh shaker screen, such as API 270, API 325, they can reduce the solids content before feeding it to the decanter centrifuge, which will increase the separation efficiency of the decanter centrifuge.
   The vertical cuttings dryer is the ideal equipment to treat the oil based drilling cuttings, we recommend the user to treat the oil based drilling cuttings from primary shakers only, the drilling waste from desander, desilter and decanter centrifuge will be easily block the screen basket and the treatment result will be influenced. They can be collected and sent to oil sludge treatment unit, to get the solids, water and recovery oil.
   If you need a solution for drilling cuttings treatment and oil sludge treatment, pls contact with GN solids control.