Dewatering system is used in a
complete zero discharge waste management system for an oil and gas drilling
rig. It is used to further treat the drilling mud after a certain operating
time of the mud system. There are more and more fine and extra fine solids
particles in the drilling fluids have to be separated out in order to make the
drilling fluid suitable for reuse.

But the extra fine particles are to
small even for the high speed centrifuges, that’s why, only physical separation
is not enough. We have to add some chemicals into the fluids and flocculate the
small particles into larger ones for the centrifuge.

What is the procedure?

There is a dewatering unit used for
this function. In the dewatering system, there are some dosing devices, one or
more chemicals are used for the system. Dosing device add the chemicals, and
some valves are used for measuring and feeding the water. It need some certain
time for the chemicals to be well mixed and ready for use. And there is a joint
of pipelines before the dewatering centrifuge, where the ready for use
chemicals enters the centrifuge together with the drilling mud to be treated.

What chemicals to use in the
dewatering unit?

Normally poly aluminum chloride
(also called P.A.C) and poly acrylamid (P.A.M) are used in dewatering system as
cheicals. the amount of usage is depend on solid concentration in the liquid
waste, and the mud condition and the depth of drilling are factors also.

GN other Waste management equipment/ systems.

If you need more information about
dewatering system or other solids control and waste management systems, welcome
to contact GN for more information. GN could provide complete dewatering system
including the dewatering unit, dewatering centrifuge and also centrifuge
feeding pump. GN dewatering unit is automatic one, with measuring pumps for accurate
feeding. It is a compact design which could be packaged in a 20ft container.

Few days before, GN’s waste materials management
equipment for three or more rigs passed the ordering and started running in
Nigeria. Total 33 units tools were involved including the squander cuttings
drying equipment, extra fine solids separation products and transferring
equipment. The photos was taken by the commissioning engineer when completing
the installation and having.
The client is one of the big drilling contractors in Nigeria, this is certainly
already the 3rd order out of this clients. Before this venture, the client
order 10 products waste decanter centrifuge in addition to 1 complete mud
flower system from
GN Solids Control
. Below links to another 2 projects for guide:
1 . Liquid Mud Flower System for Africa Drilling
2 . Ten sets GN Decanter Centrifuge for South africa Drilling Company
These thirty three units equipment are detailed as below:
3 arranged vertical cuttings dryer that is main drying equipment to get waste
cuttings, with the maximum. speed up to 1200 RPM, the G force can be up to 750.

6 value packs
high speed VFD decanter centrifuges
would meet the client’s distinct
requests on operation rate and waste conditions.
Entire 9 unit screw pushes, with 6 of them to get feeding the effluence cleared
out from the vertical cuttings dryer to decanter centrifuges, even though the
other 3 unit intended for flushing to clean the cuttings dryer.
15 set mess conveyors are located on web-site accordingly for transferring the
actual drilling waste to the dryer unit and collecting the actual solids
discharged from the dryer and centrifuge.

As per the opinions from the client, after a number of orders of GN’s devices,
they are very confident with typically the performance. This time, they
substituted all the equipment coming from a US brand that costing just a little
high by using GN’s devices with good comments to both the the cost and
GN these days has developed a series of equipment specifically
drilling waste management
additionally including the dewatering unit along
with solidification unit. If virtually any request aroused, just you can
contact with us.

GN solids control has
designed and produced hundreds of  mud
tank system for oil drilling rigs since 2008. We were also invited by some
tenders of ONGC, Oil India etc. oil company for their mud tank system. If you
have requirement for solids control equipments and mud tanks system, pls
contact with GN solids control sales.

Specifications of painting/ coating:

Internal tank with 2 layers of anticorrosive coatings, tank
outside with 3 layers of coatings, sandblast before painting. Two pack Epoxy zinc,
thickness 75 μ  for inside tank,                                                                                  
     Two Pack( first layer and
middle layer) Epoxy hi-build containing anticorrosive pigmentstwice,  thickness 250 μ   , Surface pigmented( top coating) with high
quality light fast PU pigments, thickness 70 μ for outside tank.

Mud tank materials:

Normally we make rectangular
tank for mud tank system,
sometimes we also make cylindrical tanks when rectangular tank is not suited
for the project, for example, limit of space, large volume, cheaper cost. For
rectangular tanks, we can make it open tank top or closed tank top or with
gratings cover. The mud tank dimension is calculated by the required storage
volume, we can make standard 40ft container size tank and customized size
tanks. The body(shell) of the tank is made of 6mm thickness corrugated steel plates, sometimes 8mm as required. The bottom plate is normally
8mm, sometimes 10mm as required. 3 runner oilfield tank skid with 250mm porch
on both sides.

However the above mentioned specs could be varies for different tenders.

The mud tank system also equipped with shale shaker, mud cleaner, vacuum degasser,
decanter centrifuge, cavity pump, mud hopper, centrifugal pump, mud agitator, mud
gun, slurry pump, and also with necessary mud tank accessories, including clean
gate, man hole, guard rails, stairs, walkway, pipelines, valves, flexible hose,
hammer union, mud overflow line, lightings, etc,

It is always being good to have duplicated orders from
client, this implies a lot. Just as our own regular decisions, if we are not
pleased with some products, we will go for another one. There are too many
alternatives, this is the third drilling
cuttings dryer system
for this identical client. As we know, Russia going
operation normally under cold weather, this need the gear to specially designed
for cold weather.

The Main Equipment for this job include following:
1) 1 Containerized Vertical cuttings Dryer system with winterization
2) 3 Screw Conveyor, a couple of for feeding the cuttings dryer, one for launch
drilling cuttings from the dryer.
3) Two sets decanter
with one VFD and one fixed speed. These two decanter centrifuge
is actually on the solids control tank, but they are for handling thedrilling mud
from solids control tank as well as the drilling body fluids discharged from
the cuttings dryer.
4) 3 screw pumping systems, one for cuttings dryer flushing, the other two with
regard to feeding the centrifuges.
Therefore except lower down the price, this is the way we survive in the
unpleasant time. Can not say we now have how many fans, but GN Solids Control now already have
a lot of buyers support, with their advise, using sticking to GN brand, GN is
getting better and far better now.

As the first and most important
solids control equipment in a complete solids
control system
, the shale shaker is used to separate out the most amount of
solids cuttings from the drilling rig. How to define a good shale shaker? We
have following suggestions:

1. A suitable and adjustable
G-force range. In most cases of solids control systems, the vibration G force
is from 5.0 to 7.1, the larger G force is, the better separation performance
does the shaker serve. But the actual G force is decided by the mud condition,
and the jobsite operator should choose and adjust the G force of the shaker. GN
Solids Control has several models of shale shakers,
including the single deck ones and double deck ones, and for single deck ones,
there are 3 screens and 4 screens available. And all GN shakers’ G force could
be adjusted by changing the positions of the two eccentric block in the 2
vibration motors, the largest G force could reach 7.5G.

2. Stable performance vibration
motors, it is true that the worldly wide international brands have the better
reputation because of the quality. GN Solids Control has a long term
relationship with the Italy Brand OLI for vibration motors. The standard Ex
Standard GN have is EXdIIbt4, while GN also has iEC EX and ATEX EX vibration
motors for option.

3. A strong shaker deck whose
angle could be adjusted. A strongly made structure of shaker deck is to insure
the shale shaker could bear the fierce vibration G force from the motors, while
the adjustable design enables the shaker could be used in different conditions
of drilling mud. When you need the drilling fluid to stay longer on the shale shaker screens, you make the screen
deck to have larger angle. GNZS series screens has deck angle ranging from
minus 1 degree to five degrees

More information pl feel free
to contract us ,GN can provide other equipment ,such us mud
,pumps,decanter centrifuge etc..

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