November 22 2013

GN recently got contract for 2 Barite Recovery Decanter Centrifuges, and 4 Shale Shakers, two Mud Cleaners for two sets of 1500HP oil driling rig which will be shipped to venezuela. The customer build mud tanks, and purchase solids control equipments including barite recovery decanter centrifuges from GN Solids Control regularly.

Barite Recovery Decanter Centrifuges

The barite recovery decanter centrifuges made by GN Solids Control is from SS316 material, which is coated with tunsteng carbide tiles.Also GN Solids Control make decanter centrifuges for Low Gravity Solids Separation with high G force, we can make up to 3000 G force decanter centrifuge for very fine solids separation.Also we have the Low Gravity Solids Separation decanter centrifuges. More and more customer choose GN VFD and PLC model centrifuges to do more flexible jobs.

Drilling Fluids Shale Shaker

Operating Guidelines, Barite Recovery Decanter Centrifuges.
1. The following procedures are recommended to reduce torque when operating centrifuges in barite recovery mode to maximise liquid/ solids separation:
• For a given flowrate, increase the pond depth until the recovered solids become “runny”. Buoyant force reduces the torque needed to convey solids out of the centrifuge. A shallow pond creates a long beach section. Once the solids exit the pool, the extra energy required to convey these solids results in higher torque.
• Process weighted mud continuously at a reduced feed rate rather than intermittently at higher feed rates. This reduces solids loads and results in less torque. It also increases residence time which will result in finer separation.
• At higher mud weights, use hydrocyclones to reduce the solids loading in the feed mud to the centrifuge. The cone underflow is returned to the active system. The overflow, containing fewer solids is fed to the centrifuge. Since solids concentration is reduced, torque from conveying settled solids is reduced and permits higher G-force centrifuging.Barite Recovery Centrifuge


2. Provide sufficient centrifuge capacity to process 5-15% of the rig circulation rate. Centrifuge capacity is reduced in weighted mud; the 25% target recommended for unweighted mud is usually difficult to attain in weighted drilling mud.
3. Add as much dilution fluid as possible to the centrifuge feed to reduce the mud viscosity and improve centrifuge separation performance.
4. Return the solids to a well-agitated compartment upstream of the suction and mixing tanks. (preferably jet them back in)
5. Use a high weir between the barite return compartment and the next downstream compartment to keep the fluid level high. This will promote better mixing.
6. Always wash out the centrifuge on shutdown. (water based muds only)
7. Routinely check the centrifuge performance by measuring the flowrate and solids composition of the cake and centrate.

Further More, GN Solids Control can design the complete Barite Recovery Decanter Centrifuge System for customers applications.