Containerized Dewatering Unit

The coagulation and flocculation unit
(hereinafter referred to as the CFU) is intended to serve as the mobile
unit for centrifuges chemical improvement while the drilling mud cleaning
(extraction of “process water” non-combined solvent and removal of the “drilled
solids, solid and dissolved chemical reagent” solids from the mud by
preliminary chemical treatment of the mud and subsequent phase separation in
the centrifuge).

The GNDU2000 Series 20FT Dewatering Unit
provides a process of chemically enhanced configuration to remove the fine
solids less than 5 microns from the water based drilling fluids. As it known
that traditional solids control equipments like shale
, desander,desilter,
and decanter
will removes solids upper than 5 microns, for colloidal-size
particles which is less than 5 microns will build up in the drilling mud
system. To maintain the drilling mud properties, the operators have to dilute
the drilling fluids with water, this consumes more water and create more
drilling waste.

The mud to be cleaned is supplied from mud tanks to the
station by the centrifuge feeding pumps. The mixing device (mixer) is installed
inside the CFU. The CFU process equipment perform the mud mixing (dosing) with
chemical reagents in the mixer, then the mud is fed from the CFU to the
centrifuges. Centrate (process water) obtained in the centrifuges returns to
the CFU, and solids contained in the mud are removed by the centrifuge and
transferred into the sludge transporter. Centrate (water) is measured in the
CFU and if its parameters are satisfactory, the station pumps transfer it into
the tank (receiving tank) for the new mud mixing. If results are not
satisfactory, the centrate is pumped into the sludge transporter.

Mud and water are delivered and discharged
from the CFU by flexible hoses. The water supply system shall provide water
flow rate of approximately 3 m3/h for mixing in tanks. Centrate overflow,
centrate output to the storage vessels, centrate output to the control vessel,
water input/output, mud input to cleaning shall be designed with quick-release
couplings DN50 and shall be located in the same port on the CFU outer wall. The
port is covered by cover with padlock. 50 meters of flexible hoses are included
into the scope of delivery. Centrate is fed into the centrifuged water tank by
DN150 pipeline. Pipeline inside the CFU is made of constructional carbon steel.
Flange and gooseneck outside the CFU is made of constructional steel and
intended for centrate feeding from two centrifuges. The flexible hose DN150
delivers centrate. 10 meters of flexible hoses are included into the scope of
delivery. All quick-release couplings, flanges, bolts, goosenecks shall be
included into the scope of delivery also.

The tank design is very important to keepsure all design reaches requirement and convenient for operators. The mud tank need consider its usable muddepending on drilling conditions and need consider its active circulation todrilling hole. The mud tank capacity will be affect by drilling depth also .Usable
mud is defined as the mud volume which can be pumped before suction is
lost. For example, a typical 20,000 f t
well will normally require a minimum active system tank volume of 1000 bbl.


The active surface system will be divided
into two parts, solids removal and addition suction. All solids removal
equipment and degassing equipment in the solids removal part the addition suction
part is designed to make fresh mud to the circulating system and provide
sufficient residence time for proper mixing to occur before being delivered to downhole. A slug tank is usually available to pump
small “pills “such as LCM or barite slugs for tripping. Each part must be
further divided into enough compartments to efficiently carry out its designed
function and circulation application.

The quantity of compartments required will depend
on the amount and type of solids removal equipment like shale shaker, desander, desilter, decanter
centrifuge and vacuum degasses system size and circulation mud flow each
compartment must have enough surface area to allow entrained air to break out
of the drilling mud. A rule of thumb for
the minimum surface area is calculated by: Area (squarest) = Maximum
Circulating Rate (GPM)/40To maximize solids suspension and usable volume, round
type tank with conical bottom is the best option for a tank, square or
rectangular shape with V bottom is the second option for mud tank, Square or
rectangular shape with a flat bottom is the last option but easier for
manufacture. The ideal tank depth is same with the tank width or diameter of
the tank. This design provides good pump suction head and is best for complete

GN builds many different type of tank with
different design; please contact us for more designs.

Related Arciels:

In a comprehensive closed loop of solids handle program for drilling rig, hydrocyclones combines the second and third stages for separation process. In the course of years of job experiences, the technologies has enhanced, and efficiency gets raised accordingly.
Usually, you’ll find 3 sorts optioned and now are still well-known in action:
1. Desander cones and desilter cones: GNWS-2S, GNWS-12N
This can be a very simple set of desander or desilter. By indicates of centrifugal sedimentation, 2 phase components are separated, the liquid portion goes up and discharged in one particular way, while solids element falls down in an additional way. Benefit of desander/desilter is its compact style, which needs smaller sized footprint and no consumption of shaker screens. But the treated cuttings will not be so dry. That is why this is normally utilised for unweighted mud.
two. Desander/desilter with beneath flow shaker:GNZJ752E-2S, GNZJ752E-12N
Besides the centrifugal sedimentation function offered by hydrocyclones, the desander/desilter with underflow shaker also adopts a shaker for additional drying of cuttings. The solids particles discharged by hydrocyclones fall on the screen and dried by the linear motional shaker. This style like GNZJ752E-2S is greater for weighted mud therapy comparing with GNWS-2S.
3. Mud Cleaner: GNZJ703E-2S/12N or GNZJ594E-2S12N
Here we group mud cleaner into the desander/desilter catalog mainly because its function: 3 in 1 mixture of shale shaker, desander and desilter. The below shaker is employed as drying shaker for solids particles from each desander and desilter. This really is most popular solution for most customers.

GN’s functions for above equipments:
1. Desander/desilter cones, PU material for longer service life
two. For desander/desilter with below flow shaker, it can be easily to take away the hydrocyclones and get a shale shaker. Or interchange desander cones into desilter cones with very same shaker.
three. For shaker parts, GNZJ use popular brand vibration motor for sufficient vibration force and longer life.
four. Complete shaker deck heat remedy to get a stronger structure.
five. Wedge for straightforward changing shaker screens.
6. Shaker deck angle adjustable.
Might you might be in require of above equipments, pls speak to us directly. We’re skilled in giving have to suitable option for the job internet site.

Many internet site pls refer to the related post:

Predecessor Shaker in Direct Field Comparison

USA desander is below to solids control part

GN desander desilter where possible Program available



using desander, large handling capacity, the small noise and long life of the screen. .The of round or symmetrical liquid  lets the liquid flow by the cyclone have adequate distribution and stable operation material lining

GN’s USA desander hasmore options for more applications.The GN’s USA desander  is supplied in several configurations and is known for its rugged, all-around performance. The machine is an excellent solids removal, barite recovery, and dewatering centrifuge. It has an 18” x 50"bowl and is rated at up to 250 GPM and 8 TPH. In dewatering and other clarifying applications, the process rate and tons removed will vary.

Desander is the combination of desander  apparatus. The main body can be separated into two parts,The vibration Exciter driven by a vibration motor, the full screen box to hold a forward circle rail vibration.

The sludge produced some pressure and speed, if he leads the centrifugal pump, and lower flows in the hydro cyclone along the wall, the larger solid particles along the wall of the hydro cyclone bathtub spiral under the centrifugal force and gravity, and the lower River hole and case on the discharge desander  are used for separation. The other means to rise along the spiral of the hydro cyclone, River in the desander  separation of the third category for more cleaning treatment of the overflow hole. The above procedure ensures that the mud in the following equipment can be treated well and reduce the workload.


DC machinery has overcome the disadvantage of the original production technology, producing a new desander, based on the theory of particle sedimentation. You can click here to know more about the latest collection of desander