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 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.

Modular Drilling Cuttings Waste Management Equipment for China TOP Oil Company

Since recent
months, China as many other countries as established more strict laws for
forbidden the drilling cuttings from the Oil and Gas drilling projects to be
discharged directly to the outside or anywhere else. They call them zero
discharge solutions, such solutions should be used for treating the drilling
cuttings in order to protect the environment.

Just like this
jobsite of CNPC, it is located among the farmlands and not far away from the
town. But they have found a rich oil reserve in this long time existing
farmland. Energy resources have to be explored, meanwhile, the farmlands must
to be well protected. Therefore an effective way to treat the drilling cuttings
is an urgent and very necessary solution.

They, like many
other clients of GN Solids Control chose GN waste management
systems as option and GN equipments are proved to have good
performance. Just in last year, GN Solids Control has sold around 20 sets of drilling
cuttings waste management systems to both domestic companies in China and also
abroad, clients including Baker Hudges, Shell and other world famous companies.
Most of them purchased standard GNDC series drilling cuttings waste management
systems including vertical cuttings dryer, high speed decanter centrifuge,
screw conveyors and screw pumps.

Some other
companies chose instead independent equipments per their special need and
applications, like GNLW363CG Decanter Centrifuge, they are using it as
centrifuge for treating the oily sludge on a telescopic skid, or for a
dewatering centrifuge used together with a dewatering unit, like for NIDC and KOC.

This year, for
providing most of clients’ special requests, GN Solids Control has designed
some modules for waste management. When they are used singly, they play roles
as dependent equipment for their original functions, and when they are used and
laid together, they could easily form a complete system. And during
transportation, they can easily to transport in containers.

Like in some
cases, normally you use vertical cuttings dryer and centrifuge is enough. But when
you need a high G shaker in between the above mentioned 2, you don’t have to
change to another system, just add some pipelines into it and locate a shaker
module at a suitable position.

Sources and Sizes of Drill Mud Solids

There are 2 main sources of drill solids
particles are the chemical additives and formal drilling cuttings, the drilling
cuttings are containments that degrade the performance of drilling mud. The
drilling particles will be ground into smaller and smaller and become more and
more difficult to remove from drilling mud if the drilling cuttings that not removed as per guide. Most of the
formal drill solids will be able to be removed by mechanical ways by drill
solids separate equipment and small drill particle will be very difficult to
remove and will have a great effect on drilling mud properties than the very
larger drill solids particles . The solids particle size in drilling mud
incorporated into drill mud will be range from 1 to 250 microns.

 The clay, colloidal and bentonizte will be
size between 1 to 5 microns, silt, barites and fine cement dust will be 6 to 44
microns, fine sand will be between 44 to 74 microns, API sand will be 105 to
149 microns, coarse sand can be 500 – 1000 microns, coarse that larger than
2000 microns, there will be colloidal that bellow 2 microns.

Drilling solids particles are the main contaminant
in the drilling mud, so the control of the importance of the good solids
control including increased the penetration rate and reduce mud cost, reduce
water requirement, reduce mixing problem, reduce differential striking, etc.
The drilling solids removal is important to keep drilling mud recycling and re-use.
The
main equipment for drill solids removal are shale shaker , desander, desilter, decanter centrifuge and there will be other
machine assistant to meet separation application including mud tank, centrifugal pump, valve and pipeline.

Shale Shaker for Trenchless Technology

Shale
shaker is designed to separate drilling cuttings above 100 microns by shale shaker screen separation ; there
are 2 sets of vibrator motor installed on shale shaker to supply vibrating
power at 7.0 G force. Different design of drilling
mud shale shaker may have different size and capacity, there
will be 2 or 3 or 4 panels for a single deck shale shaker for install shaker
screen with wedge type or hook type screen installation. All GN oil field shale
shakers are – 1 to 5 degree shaker deck adjusts range and trenchless shale
shaker is +2 degree shaker deck angle.

GNZS752E
mini shale shaker for trenchless
mud system that mud flow no higher than 200 GPM, it is
installed 2 sets of 0.75 kw vibrating motor at 6.5 G force with 2 pc shaker screen
on shaker deck with 1.35 square meters screen area, The screen can be install
20 to 100 mesh screen for drilling cuttings separation between 150 micron to
400 micron separation size. GNZS703E shale shaker is another trenchless
industry shale shaker for mud system that 300 GPM and above , this is a three
deck shale shaker with 3 pc shale shaker screen installed for 500 GPM mud flow
max by 40 mesh shaker screen . It is installed 2 sets of 1.72 kW vibrator motor
to supply 7.0 G force for shaker vibrating.

The
desander and or desilter
cyclones can be installed on any shale shaker to make
it as a mud cleaning for finer size separation , the desander cone can separate
50 microns and above and desilter cone separate 20 microns and above. The
minimum capacity of desander cone is 500 GPM, so we won’t be able to install
desander cone if mud flow required lower than 500 GPM but we can install
desilter cone in that case.

Hook stripe flat screen and corrugate design screen comparison

image

It is mostly used design by
current that can fit several of shale shakers that
coordinate with the design concept.  It is made with multiple layers of stainless
steel wire clothes together to a steel support plank.  The characteristic of this type of shale
shaker screen are list below:  

 l  
It contains different meshes on wire
cloth in the screen.  The sizes of the
holes that support the plank contain different mesh as well.  The support plank size also is different as
well.  Combine it all will get area that
is effective on condition to bearing enough liquid flow force.

l  
The thicker wires cloth contain less
mesh at the lower bottom of the screen together with support plank so it can
added strength of the whole screen to extend usage life.

l  
The wire cloth is divided into many
small surface grid of steel support plank which can hold the excessive
expansion to make it last as long as possible.

 Corrugate-design
shaker screen

 With demand of larger and larger treating capacity
of the drilling fluid but without building larger shale shaker, the corrugate
design screen was appear in 1990s to increase the treating surface and to fit
current use shale shaker.

Corrugate design screen has large effective area, and drilling fluid
is handled in high-efficiency by using it.

This kind of sieving screen has design characteristics as follows:

l  
 Every wire cloth in the
sieving screen has different meshes, and accurate collocation can make the
screen have better liquid treated effect.

l  
Stainless steel wire cloth is made
it like corrugate, and closely holds metal support plank together. The
effective area can added up to 125% of the flat screen with the same specification
and the size, so as to improve the quality and treating amount of drilling
fluid and increase the production.

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