Screw Conveyor is called Auger Conveyor, in oilfield drilling waste management, it is widely used for drilling cuttings transfer to feed to the drilling cuttings dryer.

Normally, totally 3 screw conveyor are needed for the drilling cuttings dryer system.
Two screw conveyors will be deployed between the mud cleaner and shale shaker and the vertical cuttings dryer unit to transport drilled cutting discharged from the rig shakers and the mud cleaner to the drilling cuttings dryer. The length of the first screw conveyor depends on the mud tank solids control equipment layout, normally 25 meters is required for the 3 shale shaker and 1 mud cleaner drilling cuttings discharge.

The third screw conveyor is required to remove the processed dry  cutting from  Vertical cuttings dryer  to the drilling  cuttings  skips.  The Screw conveyor under the shale shaker and mud cleaner is  about  25m length  will  be  placed  on  top  of  the walkway in front of the shakers and mud cleaner with enough extension to allow for an emergency skip to be placed before the second screw conveyor. This Screw conveyor will  be used both during WBM drilling phase and OBM drilling phase. Two discharge holes with a sliding plate will be made on the screw conveyor to allow for cuttings discharge into the coral during
WBM phase and to be closed during OBM phase. A third discharge hole will be towards the end of the auger extension to discharge into a drilling cuttings skip in case of emergency repair or maintenance on the Vertical Cuttings Dryer.

The next Scew conveyor (2) about 10 mtr length will be at an angle (90Deg) from the first screw conveyor, facing the coral direction. This screw conveyor will be inclined vertically to about 10-15 deg off its swivel base line, to be able to discharge drilling cuttings at the top/feed end of the drilling cuttings dryer.

The third (3) conveyor about 6 mtr length will be installed beneath the Drilling Cuttings Cryer chute and inclined outwards to fill the double skip arrangement.

GNLW553VFD is a High Throughput decanter centrifuge for drilling field. It ultizes big bowl and high speed for big volume. GN offers Variable speed centrifuge including feed pump unit, complete with all required starter boxes, hoses, cable, transformer, power pack and control panel for worldwide market.

GNLW553-VFD centrifuge utilize positive pressurized control cabinet for explosion-proof. And the VFD panel equipped with PLC system for smart and automatic control. Besides vivid control on centrifuge performance parameters, another big advantage of GN High Throughput decanter centrifuge is smart control.

We take maintenance for example. Bearing is a main and most important part in high speed rotating equipment like centrifuge, and it is cost high. Good and regular Lubrication is necessary for a reliable performance and longer lifetime of bearing. Different bearing, the lubrication duration is much different, from 48 hours from 1000hours. People have to make many records to insure regular maintenance. And normally, it is that, they remember to lubricating when there is abnormal performance. It is not good. With the PLC smart system, works no need to make the record. The PLC system will reminder you for necessary maintenance at due time.

Decanter Centrifuge – High Throughput Specification

Applications of GNLW553VFD High Throughput decanter centrifuge

1) Oil and gas drilling mud solids control system

Normally, 14 inch centrifuge used in solids control system. As a trend, more and more drilling company they prefer to no use desander, desilter mud cleaner. They only used shale shaker as 1 stage separation. That request a high standard on decanter centrifuge performance.

2) GNLW553 Decanter Centrifuge is a big bowl big volume centrifuge for fast drilling or the high volume mud like Tunneling.

3) Drilling waste management or waste water treatment for High Throughput

4) Soil decontamination for High Throughput

GN Solids Control is the only 1 API and ISO certified manufacturer who makes both mud solids control system and drilling cuttings waste management system.

Centrifuge and cuttings dryer system for drilling waste management is specially designed and made by GN Solids Control company. It is widely used in China, Middle East, South America, Russia and Africa.

Applications of Centrifuge and cuttings dryer system for drilling waste management

The drilling cuttings treatment system with both centrifuge and vertical cuttings dryer is used after mud solids control system. Formerly, many drilling rifs, they just discharge cuttings to drilling site after come out from mud solids control shale shaker, desander, desilter, mud cleaner. Nowadays, more and more government increase standard on drilling field solids discharge.

GN designed Centrifuge and cuttings dryer system for drilling waste management have wide applications. It can be used in oil based mud drilling cuttings treatment, water based mud drilling cuttings and synthetic drilling cuttings.

Equipment included in the Centrifuge and cuttings dryer system for drilling waste management

Or GNCD930C-VFD for variable frequency drive (VFD)

GN VFD centrifuge is made and designed for mud solids control and drilling waste management.

There are 4 parameters can be changed on GN VFD Decanter centrifuge:

1) Bowl speed: More speed, fluids more clean, and accordingly, solids more dryer

2) Conveyer speed: More conveyer speed, the centrifuge push material more fast, means shorter time for separation, more solids in fluids

3) Fluids height at centrifuge big end (the motor end): Now it is already the largest depth. The higher the fluids level, more clean of the fluids.

4) Pump flow: according to different treating material and different performance customer want, capacity different.

Centrifuge operator can follow below steps to find out the most suitable bowl speed, conveyer speed and pump feeding flow for decanter centrifuge in specified jobsite:

Step 1 find out the most suitable bowl speed of VFD decanter centrifuge:

Fixed the conveyor speed, like 30rpm, fix the pump flow, e.g.: 10m3/h: then increase bowl speed more and more. For more speed, the fluids phase from centrifuge will be more clean. So job site operator can try from 2500 / 2800/ 3000/3200 rpm. After 10min around normal running, take sample for each speed.

Compare the different samples to find out the best bowl speed.

Step 2 find out the best centrifuge conveyor speed:

Fix the bow speed as the same with step 1 found out, fixed the same pump flow, 10m3/h. Change conveyer speed from 23rpm, increase it more and more. For every conveyer speed, after 10min, take sample.

Compare different samples and find out the most suitable centrifuge conveyor speed for the jobsite.

Step 3: find out the biggest pump flow with best performance for the centrifuge in specified jobsite:

Set the most suitable bowl speed got from step 1. The most suitable conveyor speed from step 2, increase pump flow from 5m3/h. Increase it more and more, like, 5cbm, 8cbm, 10cbm, 15cbm, 18cbm, 20cbm, and compare the performance, to find the most suitable performance you want get.

After the 3 stages, you will find out the best performance can come out from decanter centrifuge in the specified jobsite.

Remember: Every time the treating material changed, the centrifuge operator should repeat the 3 steps to find out the new centrifuge setting suitable for the new condition.

Decanter centrifuge is a physical separation machine. If the final result cannot satisfy you, that means physical treatment not enough, you may need chemical treatment or combined with other process.