October, 2015 | GN Decanter Centrifuge

Water based mud drilling waste management system for CNPC & Sinopec

Since the new regulations for China oilfield
environment is issued, GN solids control has
provided over 25 sets of drilling waste management system for their water based
drilling fluids.

The main features of GN drilling cuttings treatment
system including:

1 Modular design: vertical
cuttings dryer, high G dryer, decanter centrifuge are all set on top of the
telescopic skid as a separate module, each module can be used separately when
the actual situation is required by the rigsite, and they can be used together
for best performance.

2 Less cost, good effect, the cuttings discharged from
the vertical cuttings dryer is dry as powder, which can be disposal directly or
used for construction industry without damage of the environment. Before using
GN drilling waste management equipments, the drilling company use the truck to
ship the drilling cuttings from the mud pit to a waste management factory, the
liquid waste spray out and they get a lot of complains from the farmers.

3 To recycle/reuse the clean fluids and less the
drilling cost. The working principal of GN drilling cuttings treatment system
is mechanical separation, without any chemicals additives. The clean fluids
discharged from
decanter centrifuge can be used for preparing the drilling fluids. Unlike
other supplier’s proposal, we do not add chemicals during the process, it will
not damage the configuration of the original drilling fluids, it can save a lot
of cost for the drilling fluids and less the waste treatment cost.

4 The high-G dryer is used to less the fine solids
content of the drilling fluids before feeding to the decanter centrifuge, the
unique design can make the centrifuge working longer time with less wear on the
screw impeller.

5 The drilling
waste management system for water based drilling fluids can be also used
for your oil based cuttings treatment, you do not have buy another unit , this
modular waste management system can be used for both of your applications.

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Positive pressurized VFD control panel for variable speed decanter centrifuge

As one the lead decanter centrifuge
manufacturers in the world, GN solids
control( with branch office GN solids America in Houston) provide both high
speed decanter centrifuge and variable speed decanter
centrifuge with VFD control panel, VFD decanter centrifuge the most popular
model during our clients from over 60 countries in the world.

We provide 4 types VFD control panel of
decanter centrifuge based on different clients requirements:

1 positive pressurized VFD control panel for
explosion proof Exd II BT4 with PLC control

2 positive pressurized VFD control
panel with IEC certificate with PLC control

3 positive pressurized VFD control panel with
ATEX certificate with PLC control

4 flame proof/ explosion proof control panel

The positive pressurized VFD control panel is
specially designed for the working site with high temperature, moist air, heavy
rain, strong sunshine area with good performance. To ensure the long operation
life, we also suggest to use a sun/rain proof cover on top of the centrifuge
unit, as GN
drilling waste management project in Sichuan, China, Where is a lot of rain
and very moisture air.

With air cooler inside the control cabinet, we
have a temperature sensor installed and setting according the environmental
temperature and client’s requirement, once the inside temperature reached the
setting value, the cooler unit will start to work and feed to the inside
cabinet cold air and let the warm air out, the constantly circulation make the
inside cabinet to remain the respectively cool and will not be too hot during
long term working in the hot weather.

PLC control VFD control panel change the
frequency smartly, the last flame proof/ explosion proof control panel can not
work in hot weather, the electric components will be too hot to stop working or
be burned when it becomes hot. And the frequency inverter is working through
very traditional way. Such products are only supplied to the cold area or when
cheapest price is required by the client.

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Solve temperatures raise a problem for decanter centrifuge

Solve temperatures raise a
problem for decanter centrifuge

Decanter
centrifuge operation in proper RPM speed is the basis for normal
operation. Operation reach above normal
temperature and cannot come down is a major concern for decanter centrifuge
operation.

Normal
operation temperature for decanter centrifuge is around 104 degree F. It is normal when change the new oil from the
old, lubricants and turn the decanter centrifuge on, the temperature will be
raised up but later will be going down.
If the temperature does not go down, then there will be some place that needs
to be checked.

The
first ting need to check is the level of
oil and lubricants in the gearbox and bearing when the decanter centrifuge is
not on. Not enough oil and lubricants
will not grease the moving parts and gears in high speed operation will cause
grinding that lead to permanent damage.
The other side of problem if too much oil and lubricants will cause the
flow not flowing properly between gear
and parts. The air and oil mixing ratio
is not balanced will cause a temperature rise and not coming down as well.

Flush
the oil in the
gearbox of
Decanter centrifuge by turn the box upside down and drain all the
oil out. When the oil is completely out,
turn the filler hole to 10 o clock position and fill the gearbox oil. When filling the oil show the sign of
overflowing oil, it is filled with enough oil and should stop. Close the draining plug and do not topping
the gearbox oil.

Turn
the decanter centrifuge on and do the first temperature check. Then it needs to check very 15 minutes to get
the gearbox and bearing uprising temperature curve. Two hours later, after turn the decanter
centrifuge on, the temperature should reach to the top and start to show signs
to go down to 104 degree F.

If the temperature does not come down after 2
hours, stop the machine and open up the drain plug. Take the compressor connect with hose and
trigger and blow the air into the drain plug.
During the filling of the new gearbox oil, it might mix with air to
create air bubbles in the gear box.
Eliminate the air bubbles and turn the decanter centrifuge back on will
result the temperature comes down to normal operating temperature.

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