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Tag Archives: Hydrocyclone

Oilfield Desander for Drilling Mud

DesanderAs an auxiliary device in the petroleum drilling, the drilling fluid desander is mainly used for eliminating the rock debris and sand carried by the drilling fluid from the stratum in the process of drilling operation.

Desanders are installed on top of the mud tank following the shale shaker and the degasser, but before the desilter. Desander removes the abrasive solids from the drilling fluids which cannot be removed by shakers. Normally the solids diameter for desander to be separated would be 44~74μm, and 15~44μm for desilter.

HydrocycloneAs one of the indispensable and important device for stabilizing and regulating those technical indicators of the drilling fluid, the drilling mud desander has also been extensively used in the tertiary purification of the drilling fluid. As the combination of the hydrocyclone desander and the shale shaker screen, the drilling mud desander is the three-level solids control equipment used in the solids control system of the drilling fluid. It is primarily made up of the vibrating screen, the distribution manifold as well as the hydrocyclones.

 

Drilling Mud Cleaner from DC Machinery

Mud CleanerCompared with the traditional desander and desilter, mud cleaner is the upgrade product. It belongs the second or third level solids control equipment in the drilling fluid solids control systems, it is the complex of hydrocyclone desander, hydrocyclone desilter and the shale shaker.

The structure of mud cleaner include desander, desilter, pressure pump, swirler, bottom flow slot, drilling fluid shale shaker, support and base. the characteristic is there is a control butterfly valve between the main inlet tube and drainpipe of desander and desilter, on the base there is a chute, the shale shaker is located on the chute. In the swirler, there are automatic sand blocking prevention equipment and bottom flow port regulation equipment.

Features & Benefits of DC Machinery‘s Mud Cleaner:
1 Polyurethane (PU) Material for desander and desilter cones.
2 Desander cones can be installed between one and three 10”desander cones, each cone can process 500GPM and makes a separation between 40 and 100 microns.
3 Desilter cones can be installed between eight and twenty 4”or 5”desilter cones,each cone can process 80 GPM, and makes a separation between 15 and 75 microns.
4 Mechanical Deck Adjustable while operation for reliable performance.
5 Compact design with small footprint, with top feed and wire feed two option.
6 Hook-strip shaker screen for fast screens changing with PWP and PMD screens.

China DC Solid control 10” Hydrocyclone

DC Solid control’s 10” polyurethane hydrocyclones offer operators a high volume 500 GPM cone where feed is tangentially blended into the cone entry as a narrow rectangle. This design minimizes turbulence in the upper section of the cone, allowing the solids to move quickly to the cone wall.

The cone is divided into three easy to replace or service sections which are held together by non-corrosive stainless steel clamps. The joints between each section are metal reinforced. The victaulic grooved connections for the feed and overflow are steel reinforced and the vortex finder is steel lined. Ceramic lower sections are available for longer life. The apex is available in 1.0, 1.375, and 1.5 inch sizes.

DC Solid control desanders make separations between 40 and 100 microns, and offer the flexibility of mounting either one, two, or three 10″ desander cones over a cone underflow pan. Each 10″ hydrocyclone processes 500 GPM at 75 feet of head, allowing for a maximum capacity of 1,500 GPM. The underflow can be discarded or directed onto a vibrating screen for further processing.

DC Solid control desanders are available in vertical or inclined manifold stand-alone models, or for inclined mounting on our shakers.

 

Working principle of Hydrocyclones

Hydrocyclones are a broad classification of settling devices that includes the desilter, desander, and clayjector. These are all basically the same device in different sizes which separate solids at different cut points.

The mud is pumped into the cyclone through a tangential opening at the large end of the cyclone. This results in a rotating motion of the fluid, much like a water spout. The resulting centrifugal force causes the particles to concentrate at the wall. The dense layer next to the wall travels downward and is ejected at the bottom of the cone. The remainder of the mud travels upward and exits through the overflow end.

At the overflow end, a short pipe called the vortex finder extends down into the hydrocyclone past the mud intake. It keeps mud from short-circuiting directly to the overflow. In effect, it taps the light portion of mud in the cyclone, allowing only the dense sludge to spiral down to the underflow.

If mud is fed to the cyclone at too high a pressure, some of the mud will exit the overflow without having time for the solids to segregate. If the feed pressure is too low, poor separation of solids occurs. This makes it imperative that the hydrocyclone be operated at the manufacturer’s recommended pressure. Four-inch desilters are generally designed to operate at 40-45 psi, and six-inch desanders at 35-40 psi.

 

Hydrocyclone trouble shooting

Hydrocyclone is designed for separating solids from liquids and are successfully used in a broad range of industrial and environment applications. It is also often used in petroleum drilling industry. This article lists some trouble shooting about hydrocyclone.

1 Under the situation of centrifugal cone no damage, the bottom flow hole of the cone block continuously.

The reason and measure: the inlet or outlet is blocked, bottom flow hole is too small. We can eliminate the block, clean pipeline, check up the shaker screen whether be damaged or appear flow around a body.

2 There is no drilling fluid flow in centrifugal cone (leakage).

The reason and measure: the inlet is blocked, so lead to the drilling fluid backflow.

3 The stock inlet pressure head is low.

Check up the running state of centrifugal pump: include the revolutions per minute, voltage, etc. Check up the pipeline block, such as solid sediment, valve close. Check up the shaker screen whether be damaged or flow around a body.

4 The centrifugal cones discharge dry particles.

The reason and measure: the bottom opening is too small, we should increase more cones.

5 The solid content in drilling fluid is increase.

The reason and measure: the processing capacity of centrifugal cone is not enough, we can install more cones. The solid particles may be too small, the mesh number of shaker screen may be too low.

6 The loss of drilling fluid is too much.

The reason and measure: The bottom flow hole of centrifugal cone is too big, decrease the diameter of discharge outlet or use the centrifugal cone with smaller nominal diameter.

7 The cone discharge unsteadily, the feed pressure head is changed.

The gas interfuse feed pipeline, check up the degasser is normal or not.

8 The bottom flow of hydrocyclone aerate.

Set passage to make the overflow enter into the drilling fluid pool.

 

Basic description of Hydrocyclone

The hydrocyclone is a vessel container with cylinder part, the cylinder part of upper cone is mud inlet room; the outboard install a tangential stock inlet; the underpart of cone is open mouth, the size of caliber is adjustable, use for discharging the solid particles.

In general, the shell of hydrocyclone is made of cast iron. For improving the wear-resisting property, the inside uses the wear-resisting rubber. For improving the service life further, shells of some hydrocyclones use the polyurethane, both wear and corrosion resistance. About the large-sized hydrocyclone, the shell use the material of alufer, interior use the polyurethane, this not only ensure shell have enough strength, and reduced the weight.

In general, the hydrocyclone is installed vertically, however also can be installed aslant or horizontally.

Most hydrocyclone, if without regard to inner diameter of stock inlet, the working performance will be best at the 23m pressure head. In market, some new cones structure may be need different pressure head, user must verify whether the centrifugal pump can provide suitable pressure to hydrocyclone manifold. When installing sand pump, should ensured less bend and T pipeline, the suction line should be the shortest length, guarantee friction loss is minimal.

Hydrocyclone is designed for separating solids from liquids and are successfully used in a broad range of industrial and environment applications. It is also often used in petroleum drilling industry.

 

Hydrocyclone for desander and desilter

Hydrocyclone is often used to separate drilling cuttings from drilling mud, and often installed on desander and desilter in solids control system.

Hydrocyclone structure

The hydrocyclone is a vessel container with cylinder part, the cylinder part of upper cone is mud inlet room; the outboard install a tangential stock inlet; the underpart of cone is open mouth, the size of caliber is adjustable, use for discharging the solid particles. There is a down inserted overflow pipe on the top centre of close vertical cylinder, and extend to below the stock inlet tangent location. The structure is constituted by cylinder, subuliform tank, mud inlet pipe, overflow pipe, sand settling tube, etc.

 

Hydrocyclone material

In general, the shell of hydrocyclone is made of cast iron. For improving the wear-resisting property, the inside uses the wear-resisting rubber. For improving the service life further, shells of some hydrocyclones use the polyurethane, both wear and corrosion resistance. About the large-sized hydrocyclone, the shell use the material of alufer, interior use the polyurethane, this not only ensure shell have enough strength, and reduced the weight.

Hydrocyclone installation

The installation of hydrocyclone should be easy to eliminating underflow, and easy to maintain and monitor. Every hydrocyclone group should be equipped with individual mud tank and centrifugal pump. A pressure gage should be installed on the inlet of header pipe to show and measure feed pressure which offered by sand pump. Except cone bottom and header pipe blocking, choose sand pump model wrongly and misoperation will also cause hydrocyclone breakdown.

 

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