Author: gnadmin

Recently one set of GNZS595J triple shale shaker equipped with ViST electric vacuum unit are ready for shipment to China drilling company. Each single shaker installed 5pcs of 585x1165mm composite material frame shaker screen which is compliant with API RP13C standard.

The GNZS595J-SHBJ linear motion shale shaker with drilling fluids flow rate approx. 140m3/h ( 616gpm), the flow rate is for reference only, it will be different based on different API No. of shaker screens. it is drived by 2ea of 1.72KW vibration motor, the max vibration G force is up to 7.5G, the shaker screen is 5pcs of 585x1165mm, total screen area is 3.4m2, the deck angle adjustable range is -1° ~ +5°, the feeding method is back feeding box by receiving drilling fluids from drilling rig to its possum belly then flow to shaker buffer box. We have CNEX, IEC EX, ATEX for option based on client’s requirement.

The ViST vacuum screen technology is utilized to work with shale shaker to reduce drilling waste and recycle more useful drilling fluids, it can be widely used for OBM, SOBM, WBM and for both onshore and offshore applications. A good ViST vacuum screen can reduce waste by 30~50% effectively, for less cost of drilling waste transportation, storage and waste treatment.
The catch pan is installed under the last screen panel by connecting with the vacuum unit, it could be 100% air operated or electric for your option. One ViST vacuum unit can be connected to 2~3 shakers with only one air supply to the ViST vacuum unit. Each electric vacuum unit is for one unit shaker only.
The 3 units of single shale shaker are installed on one triple shaker skid for convenient movement and installation, one set of possum belly is designed for these three units of shale shaker.

One unit of Diamond core drilling solids removal unit are ready to delivery to South Africa. This is our standard GNSR-130L solids removal unit with customized design for client’s special requirement. The system capacity is 130L/min, the separation cut point is 2~5 microns.

The technical configuration is as below:
1) One unit of GNZS752 two panel shale shaker to separate coarse solids and reduce solids content
2) One unit of GNLW224F-VFD decanter centrifuge to separate fine solids from the water
3) One unit of mixing hopper with mixing pump to prepare for new drilling fluids
4) The centrifugal pump can be also used as centrifuge feeding pump by switch the button of the control panel
5) 2 unit of mud gun as mud mixing to avoid the solids sediment
6) The tank volume is up to 6m3
7) Compact design to be installed on top of the trailer for convenient operation and movement
8) It can be lifted freely by lifting pad when used in the mountain

According to the client’s requirement, we may remove shale shaker when solids content is very low and no coarse solids in the mud, only use a decanter centrifuge to clean the waste water, which can be reused for drilling , reduce water consumption and reduce drilling cost, and protect the drilling machine to expend its working life.
The decanter centrifuge bowl and screw is made of duplex stainless steel 2304, the other components is made of stainless steel 316L, the screw blade is protected by tungsten carbide tiles which is replaceable once repaired. The bearing is SKF brand for reliable operation, max speed is up to 5000rpm, and typical speed is 0~4500rpm, the max capacity is 130L/min. The centrifuge bowl and screw is drived by main motor 11KW and back drive motor 5.5KW.

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.