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Tag Archives: Hydrocyclone desander

Inventory DCQJ250x2/100×10 Mud cleaner at a big discount

DCQJ250x2/100×10 Mud cleaner is one of the most hot sale model of mud cleaner equipment whose flow is about 240m3/h. At present DC Solid control has a finished mud cleaner at a big discount sale can meet your urgently requirements.

DSC00266

DC Mud Cleaner completes consist of everything you need to plumb up to and operate the equipment as it own stand alone unit. Just select the Mud Cleaner and Shaker combination you need based off of the flow rate you need to process and what micron level you need to cut to.

The unique manifold design minimizes the pressure drop across the hydrocyclones, thereby maximising solids removal and reducing the volume of mud discharged with the captured solids from the cone.

If you need to retain a larger capacity we are more than capable of constructing and fitting the equipment on any size mud cleaner you need.

Drilling fluid desander and desilter

Desander and desilter are the second and third class separation equipment in the solid control system. Desanders and desilters are solid control equipment with a set of hydrocyclones that separate sand and silt from the drilling fluids in drilling rigs.

desander

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 45~74μm, and 15~44μm for desilter.

desilter

Desilting and Desanding hydrocyclones are made from high density abrasion resistant polyurethane. The unique internal manifold design minimises the back pressure on the hydrocyclones maximising the solids removal. Fine tuning is achieved through adjustable orifice openings at the discharge point on the cone.

Features & Benefits of Drilling Desilter and desander

1. Clamp type for easy maintenance.
2. Compact design with small footprint.
3. 100% Polyurethane(PU) material for oilfield drilling fluids desilter cones with longer using life.
4. Flexible fast connection is available for user assembly.
5. Flexible options for 2, 4, 6, 8 or 10, 12, 16 for different capacities.

Both Desilters and Desanders are available in a large range of configurations including stand alone, over a shaker as a mud cleaner or packaged with a supply pump as a mobile desilting unit. Please contact DC Solid control office to discuss applications and appropriate technical specifications.

Introduction of hydrocyclone capacity

Since most hydrocyclones are designed to operate at a constant 75 feet of head at the input manifold, and flow rate through any cone is constant at constant inlet pressure, flow rate through any cone is predicatable.

Hydrocyclones are rated from 40 to 80 gpm of liquid removal. The normal 4-inch cones will remove 4gpm of solids, or 5.7 barrels per hour of solids, per cone. Therefore, the standard 16 cone arrangement will accommodate removal of 510 cubic feet of solids per hour. For 17.5 inch hole, this equates to penetration rates averaging 297 feet per hour. Clearly, if design and operational characteristics are adequately maintained, more than ample solids separation can be effected.

hydrocyclone

The accelerated gravitational forces generated in hydrocyclone are increasely proportion to the radius of the cyclone cylinder. Thus, the larger the diameter, the hydrocyclone, the coarser its cut point and greater its throughput. The smaller its cut point and greater its throughput.

mud cleaner

The smaller the cone, the smaller size particles the cone will separate. In other words, the median particle size removed decreases with cone diameter. Median particles size also increase with increasing fluid viscosity and density, but decreases as particles specific gravity increases. Oil-field hydrocyclones range between 4 and 12 inched, bases on the inner diameter of the intake cylinder. A small hydrocyclone diameter is used for ultra-fine-separation.

Application of desander and desilter

The cut point of 10 in or 12 in desander is 40 ~ 45 um and that of 4 in and 5 in desilters 20 ~ 25um. Since desanders and desilters would discard large amount of barite along with the drilled solids in a weighted mud, therefore they are usually used only with unweighted mud.2 in desilters can be optionally used for removing even finer particles (7 ~ 10um) of the underflow of the upstream desilters or mud cleaner.

Number of hydrocyclones: the number of desanders arranged in a set for a rig is determined in the way that the capacity processed by the defined number of hydrocyclones of a set of desanders must be equal to 125 % of the maximum rig circulating rate or more. A number of hydrocyclones in a set of desilters must process 150 % of the rig maximum circulating rate.

Factors influencing hydrocyclone performance:

(1) Mud density.

(2) Solid content of the underflow of the preceding equipment or solid content of the mud that gets into the inlet of this unit.

(3) Mud viscosity.

(4) Feed pressure.

(5) Feed flow rate.

(6) Apex size.

 

Desander operating manual for Bulgaria client

A few days ago, Bulgaria client ordered some solids control equipment from my company, contains shale shaker, desander, desilter and centrifugal pump. The following is the CSQ200×1Desander operating manual for Bulgaria client.

I. Summary:

Desander is the second equipment in solids control system, it is the combination of desander and shale shaker. Desander is designed by the theory of particle sedimentation. The drilling fluid produces some pressure and speed when it passes the centrifugal pump, and flows into the hydrocyclone along the wall, the bigger solid particles along the wall of hydrocyclone sink spirally under the centrifugal force and gravity, and to be discharged from the bottom flow hole and fall on the under micromeshsieve for separation. The other mediums rise along the spiral of hydrocyclone, flow into the third class separation equipment-desilter for a further cleaning treatment from the overflow hole.

II. Technical parameters:

  1. Cone Diameter:             φ200mm
  2. Cone Number:              1
  3. Inlet Size:                  φ114mm
  4. Outlet Size:                 φ114mm
  5. Separation Size:             47-74μm
  6. Working Pressure:            0.15~0.35Mpa
  7. Treating Capacity:            60m³/h
  8. Power :                    0.4KW
  9. Matching pump:             11kw

10. Dimension:                 1470×1400×1650mm

11. Weight:                    550kg

III. Installation and debugging:

Desander is mainly composed of shale shaker, hydrocyclones, etc. The liquid inlet pipe and overflow pipe are symmetrical structure at both ends, convenient to install. The liquid outlet of centrifugal pump and the liquid inlet pipe of desander should be connected with pipes.

IV. Running and maintenance

1.Reference work pressure for the swirler (8″) processing slurry with different density is seen in the following table:

Slurry density( g/cm³)

Work pressure (MPa)

1.00 0.22
1.08 0.24
1.20 0.26
1.32 0.29
1.44 0.32
1.56 0.34
1.68 0.37
1.80 0.40
1.92 0.42
2.04 0.45

2. Under ideal working state the spouting angle at the bottom will be 20°~30°.

3. No load running should be going for 5~10 minutes after every halt of pump running, with screen cloth cleanly washed in clear water. And it is especially to do so when slurry having big viscosity to be processed with close-mesh screen for processing effect will be impacted because the meshes are blocked by sticky substance and silver sand.

4. After the equipment has run up to 4000hours, the wearing parts including upper cone-shaped canister and body case of the swirler, etc. should be checked or replaced.

V. List and type of wearing parts

No.

Name

Specification

Quantity

1

Cone

Ф200mm

1

2

Screen

 600×1600mm (120~150mesh)

1

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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