Author: gnadmin

Recently one batch of solids vacuum pump, mud cleaner and mud cleaner are ready for shipment to Middle East Oilfield Service Company.
The 3 units of solids vacuum pump is used to clean up the drilling waste at the drilling site and for tank cleaning.

1 unit of 1000gpm mud cleaner GNZS594J-2S12N, with 2 ea of 10 inch desander cone and 12ea of 4 inch desilter cone, the hydrocyclone frame installed on top of the bottom shaker, with 4 panel of shaker screens 585x1165mm, the treating capacity for drilling fluids is 1000gpm, the shaker screen is composite material frame for longer working life.

1 unit of GNLW363D decanter centrifuge，the working principal of the decanter centrifuge is as below:

The centrifuge bowl and screw rotates in same direction with a set differential speed, the feeding material is transferred by the centrifuge feeding pump continuously into the screw shaft, then flies to the bowl along with high speed increase. Under the working of centrifugal force, the heavy phase solids deposite on the bowl wall to form sediment layer, the solids is pushed the bowl cone section and discharged from the solids outlet. The light liquid phase forms a liquid ring, which is continuously overflow out of the bowl from the liquid outlets at the big end of the bowl. The straight section of the bowl is the clarification area, and the cone section is extrusion drying area. The decanter centrifuge separation cut point is 2~5 microns, with proper chemicals additives, the separation cut point is up to 2 microns. The centrifuge bowl diameter is 360mm, the bowl length is 1271mm, the max speed is up to 3900rpm, and max G force is 3063G, the designed capacity for water is 200gpm, and typical capacity is 132gpm, the main motor is 50HP, back drive motor power is 15HP.

One set of solids control system and one set of drilling waste management system are ready for delivery to our client. The technical specification is as below:
1) Solids Control system, including one unit of GNZS703F-SHBF shale shaker, one unit of GNZJ703F-12NF desilter, one unit of 100YZ160-38A submersible slurry pump, one unit of GN50YZ40-10B submersible slurry pump as decanter centrifuge feeding pump, one unit of GNLW452D-GP decanter centrifuge, 2 units of mud tanks with mud agitator, mixing hopper, mixing pump and tank accessories, one set of 36ft screw conveyor GNSC12B-36 to collect drilling waste discharged from shale shaker , desilter, decanter centrifuge.

2) Drilling waste management system, including GNCD930E-GP vertical cuttings dryer, GNLW363C-VFD decanter centrifuge, GN50YZ40-10A submersible slurry pump, mud agitator and mud tank with electric control system.
The solids control system and drilling waste management system work together as a closed loop zero discharge system, the user do not need to make extra waste pit to stock the drilling waste, according to environmental protection laws, it is forbidden to dig waste pit at drilling site.

The working principal is as below:
The drilling mud flow to shale shaker for primary solids separation, the treated mud dropped into the shaker tank first compartment, the desilter feeding pump (submersible slurry pump) transfer the mud to desilter cone for fine solids separation and flow to desilter compartment, the decanter centrifuge feeding pump ( submersible slurry pump) feed to decanter centrifuge for ultra fine solids separation and the clean fluids drop into the centrifuge tank 1st compartment, the clean fluids can be recycled directly or adding chemicals to prepare for new drilling fluids with mixing hopper and mixing pump. The drilling cuttings are collected by screw conveyor and transfer to vertical cuttings dryer system.
For more information of solids control system and drilling waste management system, pls contact GN solids control.

NEMO pump is normally used as decanter centrifuge feeding pump.
How to operate GN NEMO pump?

In actual operation, the decanter centrifuge back drive motor should be started firstly, wait 5 second till it reach normal speed, start the main drive motor and wait to normal operation, finally start the feed pump motor. When shut down, firstly stop the feeding pump motor, close the main pipe valve and open flushing pipe valve to flush the centrifuge. When flushing is finished, stop the main motor , then stop the back drive motor, finally switch off the main power supply.
When operate the NEMO pump, always remember that never run the NEMO pump dry, rotations in dry condition will damage the stator. The Netzsch screw pump is a progressing cavity pump which produce pressure that may cause the bursting of vessels or pipes, and open valves and vents before starting the pump, and check the rotation direction.
How to maintenance the Nemo pump?

1. Clean the Nemo pump if need, the pump should be cleaned regularly if the feeding materials deposit. You can clean the pump through the cleaning ports, or manually by dismantling the pump.
2. Lubrication of the Nemo pump every 5000 operating hours or 2 years whichever comes first.
3. Shaft sealing through single mechanical seal
4. When the stator is stock for a long period, it is suggested to remove it and stored in a cool dry place in air tight package to give protection against light and air. Otherwise the stator will increase the break away torque.
5. When a stand by nemo pump is re-started, it might be seized due to compression, it should be running time to time.
   If you have problem to operate decanter centrifuge feeding pump, pls contact with GN solids control engineer.

Recently one batch of 18 inch drilling mud decanter centrifuges are shipped to offshore drilling platform. The decanter centrifuge is customized designed for offshore drilling company, the features are as below:
1) With offshore standard design lifting frame for offshore platform lifting, the third party lifting certificate is for option

2) The control panel is with stainless steel cover cabinet for anti corrosion
3) The control panel is for easy operation and maintenance compared with positive pressurized VFD control panel without needing air supply from rig
4) The centrifuge collection box is stainless steel material and the screw propeller is made of SS316L, The centrifuge bowl and the screw core is made of duplex stainless steel SS2205 or SS2304 by centrifugal casting, which is superior to the performance of SS304 and SS316L.
5) The solids outlet and fluids outlet is protected by tungsten carbide alloy which is replaceable hard alloy sleeve.
6) The screw is protected by repairable tungsten carbide tiles, which is with longer working life of hard facing wear resistant coating
7) SKF brand bearing for reliable operation and longer working life
8) Planetary gear box with large transmission torque, small size, stable operation and convenient maintenance.

9) The painting and coating is from PPG/ Japan Kansai Heavy Duty Marine Painting, corrosion resistant life time is up to 10 years.
Except for 18 inch bowl drilling mud decanter centrifuge, GN also produce 14 inch bowl decanter centrifuge, 22 inch bowl decanter centrifuge, 30 inch bowl decanter centrifuge with different treating capacity, the explosion proof standard CNEX, ATEX, IECEX of motor and control panel is for option.
We use manual speed adjustable screw pump as decanter centrifuge feeding pump to be installed on the centrifuge telescopic skid. If you need offshore drilling mud decanter centrifuge, pls contact with GN solids control.

This week one complete set of mud tank system are ready for delivery to India oil drilling company. This is a customized mud tank system and a repeat order from the drilling company. The detailed technical configuration is as below:

1) Total active tank volume 80m3, water tank volume 40m3, trip tank volume 8m3, pill tank volume 8m3

2) The solids control equipments installed on the mud tank system including 1 unit of mud gas separator, 2 units of double deck shale shaker ( the treating capacity is up to 600gpm), 1 unit of desander, 1 unit of mud cleaner, 1 unit of vacuum degasser, 1 unit of high speed decanter centrifuge, 2 units of desander desilter feeding pump, 1 unit of mixing pump with mixing hopper, 1 unit of trip pump for trip tank, 1 unit of water pump, 1 unit of pill tank transfer pump, 1 unit of decanter centrifuge feeding pump, 4 units of mud agitator, 8 units of mud gun and other mud tank accessories, such as radar liquid level meter, audible visual alarm, IEC explosion proof control system, walkway, guardrail, stairs, pipelines, etc.

3) Shaker screen and complete set of spare parts, the shaker screen used for shale shaker and mud cleaner is OEM produced by GN solids control comply with API RP13C standard, the composite material shaker screen frame with 3 layers of stainless steel wire mesh and 4 sides pre-tensioned to ensure longer working life of the screens, and save time for screen replacement.

The mud tank system is designed as per client’s requirement and their rig site layout, it will be packed as sea worthy package to be shipped by containers or bulk cargo. If you need a customized solids control system for oil drilling rig, pls contact with GN solids sales.