Tag Archives: Oilfield Centrifuge

Decanter Centrifuges for oilfield applications are often introduced to deal with drilling mud within active solids control system or waste effluent of drill cuttings. With middle speed decanter in operation, barite can be recovered and high speed decanter for the removal of undesired ultra fine solids.

Our purpose-built oilfield decanter centrifuges are abrasion resistance, combine long life with capacity and performance, require less maintenance time and reduce down time.Top rated explosion proof motors with approvals of IEC Ex, ATEX, UL for option for hazardous area, wired with 460V / 60Hz, 380V / 50Hz.

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The decanter centrifuge Drum and spiral parts titanium welding with 304/316 / 316L/321 stainless steel, stale performance and long service, warmly welcome by the customers at home and abroad.

Recent days, DC Solid control shipped one set of DCLW355-1250 decanter centrifuge, the decanter centrifuge is widely used in waste water treatment, crude oil recovery, coal tar recovery, palm oil recovery, fruit juice production, protein production, DCS production, starch production, food waste treatment, etc. DC have the decanter centrifuge from 9 inch bowl to 22 inch bowl available for different applications. DC decanter centrifuge bowl length and diameter ration is over 3, this gives the best result for the drilling fluids cleaning.

DC Solids Control based in China manufacture and supply complete line of high-speed, variable-speed and fully variable-speed decanting centrifuge for handling drilling fluids. Our factory and company are Quality Management System ISO 9001-2000 certified

Decanter centrifuge is the third phase solid separation equipment of drilling fluid mud system. This week DC Solid control shipped 2 sets of Middle decanter centrifuge to Russian. The model of the Middle centrifuge is DCLW450-1000 Series which is a professional unit used for drilling fluid cleaning system.

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The main specification as below:

Drum dia:450mm
Drum length: 1000mm
Treating capacity: 45m3/h
Main Power: 22kw
Back Power: 11kw

The Operation Principle of Drilling Mud Decanter Centrifuge

The drilling fluid decanting centrifuge is driven by two motors. The main motor drives the drum and differential shell rotation by the belt . The vice motor drives the spiral through the differential variable speed . The drum and spiral
rotate together in the same direction, but at different speeds . Separate the solid phases in the drilling mud by the centrifugal sedimentation principle. Suspending fluids is pushed into the rotor drum through the inlet pipe and under
the force of screw propeller, under the effect of centrifugal force, the solid phases will be pushed onto the inside wall of the drum, pass the impeller on the screw propeller and be discharged from the exhaust hole at the small side of
the drum. The fluids is excreted from the overflow hole of the large end. So continuous circle like above to achieve the target of continuous solid-liquid separation.

DCLW decanter centrifuge adopts centrifugal force to separate solid particles out of drilling fluid.Different solid or particle have different density and flow speed,some decanter centrifuge also can separate particles as different size
and density DCLW decanter centrifuge is widely used in oil and gas drilling,chemical,foodstuff,pharmacy,mineral beneficiation,water treatment,etc.

In order to fully understand how a decanter centrifuge operates, we must first define what a centrifuge does. In many industrial jobs, solid material often mixes with liquids, contaminating water supplies or turning mud into sludge.

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A decanter centrifuge is useful in that it separates solids and liquids, and has become an essential component of water waste facilities and the chemical, oil, and food processing industries. Moreover, without a centrifuge, many of these companies would become so inefficient they could not function.

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Do you know what factors determine the performance of decanter centrifuges ? Please carefully read as below.
1.the centrifugal force required for sedimentation of the solids
2.the clarification area necessary to “capture” the solids
3.the differential speed required to transport the solids out of the decanter
4.the hydrodynamic design, which determines the exact parameters for the turbulence
5.the design of the conveyor and beach sections, which are important for efficient solids transportation.

If you meet any problems of the decanter centrifuge, please contact DC Office to get the solutions.

Centrifuge used in well drilling mud solids control is decanter centrifuge, also referred as decanting centrifuge. It is rather popular with drilling contractors or fluids service company. Strictly speaking, centrifuge is the 5th purification or cleaning equipment for drilling fluid. It is set after desilter cone or mud cleaner. It is mainly used to separate solids sized 2~7 microns.

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Description of decanter centrifuge

Decanter centrifuge including low speed, middle speed and high speed one. Different speed will produce different centrifugal force, treating capacity, and separation point. Centrifuge consists of scroll conveyor, drum, motor, differential, inlet port, discharge port, solid discard port, and so on. Decanter centrifuge will be fed by submersible slurry pump or screw pump with drilling fluid for finer separation of solid.

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Centrifuge procedure

The material feeding into the inlet port, under centrifugal force generated by drum and scroll conveyor rotation, the solid will be dried and discharged via solids discard port. We know, on the centrifuge bowl or drum there are liquid zone and drying zone. Cleaned drilling fluids will flow out centrifuge via the clean liquid effluent at liquid zone end.

If you are looking for an oilfield decanter centrifuge that is highly effective and affordable, please browse our products. We offer a range of centrifuges of different sizes and capabilities that give you the exact results you need at a price that you can afford.

High speed has costs, not to the driller, but to the centrifuge owner. Suppose the centrifuge is one pound out of balance. If the centrifuge rotates at 900 RPM, the unbalanced load is 276 lbs, and this unbalanced load is carried by the bearings through to the frame. If it sped up too 1800 RPM, the unbalance load goes up to 1,104 lbs. To keep the centrifuge from shaking itself to death or an early bearing failure, higher speeds require better mechanical tolerances. Generally, to maintain these tolerances over a service life of many years, the centrifuge should be made from stainless steel.

decanter centrifuge

The second problem is stress. All of the mud in the centrifuge is pressing outward putting the bowl and hubs under stress. As the centrifuge is run faster and faster, the stresses build up and can cause catastrophic failure. No decanter centrifuge should be run faster, with a heavier weight mud than it’s designer planned on, and in addition, the structural parts should be in good shape. Corrosion and wear can weaken a centrifuge to the point where it is unsafe at any useful speed. Higher speeds require high strength, corrosion resistant materials.

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The third problem is wear. Drilling mud contains grit; it slowly grinds the wearing surfaces of the centrifuge, and eventually enough metal is worn away that the centrifuge must be rebuilt. The wear rate is proportional to the g-force. At low speeds, the grit is ground into the metal at a moderate force, but doubling the bowl speed causes four times the wear rate. It cuts the service life to 1/4 of what it would be, and considering down time, easily increases the maintenance cost five fold.

In addition, as the centrifuge wears, it loses metal. It unfortunately doesn’t lose it uniformly, and as it wears, it goes out of balance. As I discussed previously, imbalance means premature failure through excessive vibration.

The decanter centrifuge has been widely applied in drilling fluids solids control system. Due to the high rotation speed provided by decanter centrifuge, if any abnormal situation happend in use, stop running and check for solution immediately.

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Solutions to common problems of decanter centrifuge:

Problem 1: excessive vibration of decanter centrifuge.

Reasons and solutions:

1. The solids particles settled in bowl have not been cleaned thoroughly–clean it.

2. Defective shock absorber–change it for new one.

Problem 2: overtemperature of bearings. (above 75℃)

Reasons and solutions:

1. Lack of lubricating oil–oiling the bearings.

2. Wear of bearings–change the damaged bearings.

Problem 3: the bowl doesn’t work when the main motor is activated.

Reasons and solutions:

Main motor overload for excessive solids particles set in–clean the bowl and adjust the grout intake.

Problem 4: abnormal noise is heard from bowl.

Reasons and solutions:

1. unsuitable usage of lubricating oil, such as improper oil type or volume–check and adopt suitable oil.

2. bearings damaged–change for new ones.

Drilling mud decanter centrifuge is the fourth stage equipments for a drilling mud system.Drilling mud cleaning first stage uses drilling fluids shale shaker ,then second stage uses desander,third desilter,(now drilling mud cleaner is widely used to replace desander,desilter.

decanter centrifuge

With a horizontal oilfield decanter centrifuge, the mixture of drilling liquid and cuttings and solids enter into the centrifuge. When it enters the centrifuge, it gets spun at an extremely high rate, sometimes as much as 3000 times the force of gravity. When this happens, the solids will separate from the liquids. When they are separated, the drilling liquid can be decanted and eventually returned to the mud tank where it can be replaced into the borehole for efficient drilling.

One of the biggest advantages to having an oilfield decanter centrifuge is the size that it takes up. Compared to other solids control equipment, a centrifuge takes up less real estate.

On many oilfields the site footprint is not large enough to support a wide range of solids control equipment. A centrifuge is highly effective and efficient so you can separate solids from drilling liquids even on small drilling sites.

Decanters (decanter centrifuges) are “solid material oriented” centrifuges which can process liquids / suspensions with high solid material contents (up to ca. 60% by volume).

The decanter (decanter centrifuge) belongs the continuous sedimentation centrifuges with respect to the eduction of fluids as well as the eduction of solid material.

decanter centrifuge

Typical areas of use are:

Clarification of liquids and suspensions
Thickening of sludges
Dehydration of sludges and suspensions
Washing
Classification (wet classification of solid materials in a suspension according to grain size)
Extraction
Separation of 3-phase mixtures (two fluid phases, insoluble in each other, and a solid material phase)

You are welcome to contact Tangshan Dachuan Machinery to get more detailed infos, we will supply our best service for you.

The three phase decanter centrifuge. It is made of cone drum, spiral unloader, differential system, bearing base, engineer base, main motor, back motor and electrical system.

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To be as a leader of wasterwater treatment company.  DC Solid control developed a 3 phase decanter centrifuge used in oil and gas field and all kinds industires wastewater treatment projects.

three phase centrifuge

All of our decanter centrifuges adopt the international advanced special structure design. The centrifuge has the advantages of superior quality and efficiency, with larger treating capacity , better separation effect and easy to operate.

The machine has the certificated of ISO9001-2000. Meachanical properties is higher than JB/T502-2004《spiral sedimentation unload centrifuge》standard.

Centrifuge for is fourth phase oil drilling rig fluid solids control equipment. Mainly separate particle sized 2-7microns. DC Solid control produced the best quality centrifuge working well in -40degree centigrade.

As we know, at the beginning centrifuge for drilling rig is from chemical and food industry, etc. But now, we find centrifuge for drilling fluid process is more advanced and professional.

centrifuge

Centrifuge Main work performance:

1. Centrifuge capacity

Treating capacity is larger than before. Such as there are some centrifuge can even treat
drilling fluid upto 4t

2. Centrifuge speed effect

We usually have two type centrifuge. Including common or middle speed and high speed centrifuge. Commonly, if we only choose middle speed centrifuge we can’t solve
all problems on drilling fluid. High speed centrifuge can separate drilling fluid as two part including water and drier objects. This will benefit environment much

3. Structure

On the structure, we change double motors to single motors driving this make construction more simple and compact.

So if you have interest with DC high quality centrifuge, please feel free to contact us.