In a complete
drilling rig system, there is a solids control system which is used for
separate out the drilling cuttings from the drilling liquid which comes back
from the drilling wellhead. And with this solids control system, the drilling
cuttings are to the most separated out from the liquid, and after adding some
necessary chemicals into the clean liquid, the drilling mud goes back to the drilling
system. It is considered as a closed loop of drilling.
But you may ask,
how to deal with the drilling cuttings discharged from the shale shaker, mud
cleaner, desander, desilter and the centrifuge? Will the drilling cuttings
damage the soil or land of the environment?
And what to do
with the drilling liquid after it serves for several drilling rigs? Is it
possible that all the drilling cuttings are fully separated out? Is it possible
there are smaller and finer particles in the liquid?
GN has answers
for those questions by using the waste management systems.
their different function, the waste management could be divided as below:
1. the waste management
for further treating the drilling cuttings from the upper hand solids control
system. GN has several standard designed options for these waste management
systems. Normally, a screw conveyor collects and transfer the drilling cuttings
to the vertical cuttings dryer, the liquid discharged by the cuttings dryer
flows into a conserve tank of something alike to be transferred to decanter centrifuge
with a high speed. Both the solids discharged from the cuttings dryer and the
centrifuge are very dry. And liquid could enter to solids control system.
3. for the
drilling fluids, GN provide dewatering unit and high speed decanter centrifuge,
after some time operation, the particles become extra fine in the liquid, need
some chemical to merge them to be big enough for centrifuge separation.
A solids control
system for a drilling rig is the recycling system for the drilling liquid. But
during the recycling procedure, in order to ensure the performance of drilling
mud, there are continuously drilling cuttings to be separated out from the
drilling liquid and discharged. How to deal with the drilling cuttings, how to
discharge the waste without harming the environment, they are the question for
the drilling waste cuttings.
At this time, the
drilling cuttings still have some drilling mud on them, if discharged directly,
there are two problems: one is that the drilling mud is containing a lot of
chemicals which may pollute the soil and ground. The soil polluted by drilling
mud could be barren for more than 100 years. The other is that, the drilling
mud is valuable, better recover as much as possible to save the cost.
In order to solve
this problem, the engineers and professionals find below solutions:
cuttings discharged by solids control system is collected by screw conveyor to
the waste management system, to the first equipment, like in a standard GN
Waste Management System GNDC-40A system, it is a vertical cuttings dryer
GNCD930D, which is the 4th generation vertical cuttings dryer GN
designed and developed. This vertical cuttings dryer functions like a big
washing machine and helps to dry the cuttings. The liquid part falls down to a
tank and liquid in the tank waiting for being treated by a decanter centrifuge.
GNLW363CG-VFD is always an ideal high speed centrifuge to further treat the
mud, it is used to separate out the extra fine particles, and the drilling
liquid, very clean liquid falls directly back into the drilling system.
2. now how are
the drilling cuttings? yes, they are dry, but still not ready to be discharged.
GN is the first solids control manufacturer in China to design and produce a
set of solidification unit. That is used to make the drilling cuttings into
cakes and safe to be discharged.
If you have
interest in those technology or equipment, welcome to contact us freely.