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Tag Archives: desander

Old-fashioned desander and desilter delivery from DC Solid control

Desander and desilter is widely used in mud cleaning system. Following the progress of the time and high requirements of users. The desander and desilter all make greats progress. But recent days, DC Solid control company got an order of 6 sets old-fashioned desander and desilter used for HDD industry.

Desander is installed on top of the mud tank following shale shaker and vacuum degasser, but before the desilter. Desilter is installed on top of the mud tank following Desander. They also can be installed completely: in this case, they are installed on one deck shaker and called mud cleaner or mud conditioner.

desander desilter

Desander removes the abrasive solids from drilling mud which cannot be removed by shale shakers. Normally the solids diameter for desander to be separated would be 45~74μm, and 15~44μm for desilter.

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.

 

Testing desander unit used for piling field in DC Machinery workshop

Desander is an common equipment of piling field which mainly separate out the 45-75um solid phase. Last week, the desander unit manufactured for Singapore clients tested in DC machinery workshop.

Structure of piling desander 

Desander is the combination of hydrocyclone and shale shaker. The main body can be separated into two parts, the above part is the hydrocyclone and the bottom is the circular shale shaker. The vibration exciter is driven by a vibration motor to keep the whole screen box vibrate with a forward circular track.

desander1

Piling Desander Features

Desander Options with shaker and without shaker for flexible applicaiton.
Desander Cyclone PU material with better Abrasion resistance
No under shaker design structure compact and assembly flexible
Mini desander cleaner with shaker for both weighted / unweighted mud in various drilling

desander

Desander is placed after shakers and degasser but before desilter. Different from the Shale Shaker separating solids by screen. If you want to learn more about it, please contact us.

Comparative Operation of Desanders and Desilters

desanders

The role of desanders is to reduce loading downstream on desilters. Installing a desander ahead of the desilter relieves a significant amount of solids loading on the desilter and improves desilter efficiency. High rates of penetration, especially in unconsolidated surface hole, where the largest-diameter bits are used, results in generating larger concentrations of drilled solids. This may place desilters in rope discharge. For this reason, desanders, which have greater volumetric capacity and can make separations of coarser drilled solids, are placed upstream of desilters.

deislter

Desanders remove a higher mass (i.e., coarser drilled solids) during periods of high solids loading. Desilters can then efficiently process the reduced solids-content overflow of the desanders. If the drill rate is slow, generating only a few hundred pounds per hour of drilled solids, the desander may be turned off and the desilter used to process the entire circulating system.
Desilters should be used on all unweighted, water-base mud. These units are not used on weighted muds because they discard an appreciable amount of barite. Most barite particles fall within the silt-size range. Desilter operation is important for all unweighted fluids; however, in oilbase muds with high viscosity (as found in deepwater drilling), the apex discharge may be centrifuged for oil-phase salvage.

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.

SWACO 2-12 D-SANDER VERTICAL-MOUNT

Efficient, high-rate vertical-mounted D-SANDER

The 1,000-gpm (3,785-Lpm) M-I SWACO 2-12 D-SANDER removes 95 percent of the drilled solids to 74 microns and up to 50 percent to 40 microns. The 2-12 D-SANDER with Vertical Mount includes two 12-in (305-mm) diameter polyurethane hydroclones vertically-mounted on a heavy duty skid. Each hydroclone includes four replaceable wear resistant polyurethane sections that are joined together with quick release stainless steel clamps.

The D-SANDER includes an 8-in (203.2-mm) diameter feed manifold, a 10-in. (254-mm) diameter discharge manifold and a 0-60 psi (4.1-bar) pressure gauge. The D-SANDER also includes a solids discharge trough with a 6-in (152.4-mm) diameter solids discharge nipple and a 1-in. (25.4-mm) NPT wash line connection.

Features & Benefits

1  Efficient – The 2-12 D-SANDER removes 95 percent of the drilled solids to 74 microns and up to 50 percent to 40 microns.

2 High Processing Rate – Processing capacities of 1,000 gpm with the 12-inch dual cone.

3 Configured to Customer Needs – The 2-12 D-SANDER is available in space-saving vertical-mount skids and slant-mount skids.

4 Field-Proven Cone Design – Field proven in years of oilfield operation, each hydroclone assembly includes four replaceable wear resistant polyurethane sections joined together with quick-release stainless steel clamps. Worn sections can be replaced quickly and easily.

5 Extends Equipment Life – The 2-12 D-SANDER helps minimize maintenance, repair and replacement of downstream equipment. Field test data confirms D-SANDERs increased customer’s mud pump fluid end part life by 300 to 400 percent and minimized downtime overall.

6 Reduces Operating Cost – Based on actual comparative field tests, operators using D-SANDERs found they could increase bit life by 20 percent and reduce overall drilling time by 23 percent.

7 Rugged – The 2-12 D-SANDER is reliable and built rugged to provide long in-service life.

 

 

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.

 

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.

 

Arrangement of Solids Control Equipment

The following pictures show the recommended arrangements of the solids control equipment for unweighted and weighted mud systems. In general, the various pieces of equipment are arranged in decreasing order of their cut points as the mud proceeds downstream from the flowline.

Any dilution water used should be introduced ahead of the solids- removal devices in order to improve their separation efficiency. Additions of all other mud materials should be made downstream from the last solids-removal device.

The feed and discharge of each device should be separated so that newly processed mud is not fed back to the device. Preferably, the feed and discharge should be in alternate pits. The discharge end of the overflow pipe from a desilter or desander should be above the mud level. If it is not, the separation efficiency will be reduced and mud can siphon back through the cones and out the underflow when the pump is shut down.

 

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.

 

Drilling fluid Desander and Desilter for sale

Desander is the second equipment in solids control system, it is used to separate the solid phase particles whose diameter is more than 44μm from drilling fluid.

Desilter is the third class equipment in solids control system, it is used to separate the solid particles whose diameter is 15-44μm from drilling fluid.

Desander and Desilter are designed by the theory of particle sedimentation. The separation medium-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 next class separation equipment for a further cleaning treatment from the overflow hole.

In order to meet the requirement of disposing all drilling fluid, desander and desilter must be constituted by several hydrocyclone cones. For ensure the normal work of hydrocyclones, the liquid inlet pressure must be kept 0.25~0.35MPa. Due to the cones of desilter are more, pipeline is long, so the liquid inlet pressure should take larger value; the cones of desander are little, pipeline is short, so the liquid inlet pressure should take lesser value.

The liquid inlet pressure mainly depends on whether the matched sand pump is reasonable, thus it is important for choosing sand pump. Throw of sand pump is about 40m generally, the discharge capacity is equal to the marked thruput of desander and desilter, can satisfy the use requirement. Meanwhile, choosing desander and desilter must refer to the max thruput of drilling pump, achieve reasonable match.

 

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