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Tag Archives: shaker screen

Operating Guidelines of Shale Shakers

IMG_2359
Shale shakers should run continuously while circulating. Cuttings cannot be removed if the shaker is not in motion

  1. Drilling fluid should cover most of the screen. If the drilling fluid covers only one fourth or one third of the screen, the screen is too coarse.
  2. A screen with a hole in it should be repaired or replaced at once. Holes in panel screens can be plugged. Install screens according to manufacturer’s recommended installation procedures. Cuttings are not removed from the drilling fluid flowing through the hole.
  3. Shaker screen replacements should be made as quickly as possible. This will decrease the amount of cuttings remaining in the drilling fluid because the shale shaker is not running.
  4. Locate and arrange tools and screens before starting to make the replacement. If possible, get help.
  5. If possible, change the screen during a connection. In critical situations, the driller may want to stop (or slow) the pumps and stop drilling while the screen is being replaced.
  6. For improved screen life with nonpretensioned screens, make certain the components of the screen tensioning system, including any rubber supports, nuts, bolts, springs, etc. are in place and in good shape.
  7. Check condition of vibration isolators members and screen support rubbers and replace if they show signs of deterioration or wear.
  8. Water should not be added in the possum belly (or back tank) or onto the shale shaker screen. Water should be added downstream.
  9. Except in cases of lost circulation, the shale shaker should not be bypassed, even for a short time.
  10. Wash screen(s) at the beginning of a trip so fluid will not dry on the screen(s).

The possum belly (or back tank), should not be dumped into the sand trap or mud tank system just before making a trip. If this is done, cuttings will move down the tank system and plug desilters as the next drill bit starts drilling.

Primary purpose of shale shaker

Shale shaker is a general term for a vibrating device used to screen solids from a circulating drilling fluid.

Many configurations have been used. These include:
1 A square or rectangular screening area with drilling-fluid flow down the length.
2 Revolving, nonvibrating, cylindrical screens with longitudinal flow down the center axis.
3 Circular screens with flow from the center to the outside.

Other configurations have been tried but have not become commercial. The majority of shale shakers flow the drilling fluid over a rectangular screening surface. Larger solids are removed at the discharge end, with the smaller solids and drilling fluid passing through the screens into the active system.

Shale shaker

The primary purpose of a shale shaker is to remove as many drilled solids as possible without removing excessive amounts of drilling fluid. These dual objectives require that cuttings (or drilled solids) convey off the screen while simultaneously most of the drilling fluid is separated and removed from the cuttings. Frequently, the only stated objective of a shale shaker is to remove the maximum quantity of drilled solids. Stopping a shale shaker is the simplest way to remove the largest quantity of drilled solids. Of course, this will also remove most of the drilling fluid. When disregarding the need to conserve as much drilling fluid as possible, the ultimate objective of reducing drilling costs is defeated.

 

Mud Cleaner for drilling mud

In the early 1970s, the mud cleaner was developed as an addition to the desander and desilter for reducing loss in the expensive liquid phase. Hydrocyclones discard a slurry, including the liquid phase, which can be expensive over time.Mud Cleaner

The mud cleaner takes the underflow from a bank of hydrocyclones and introduces the slurry to a very fine, pretensioned vibrating screen. The expensive liquid phase and most of the barite pass through the screen and back into the system while the larger solids are discarded.

This was the first successful application of a screen, bonded to a rigid frame, using very fine screens. Many mud cleaners have screen cleaners, or sliders, which are circular plastic pieces that vibrate against the bottom of the screen to prevent screen blinding.

When the mud cleaner handles the weighted drilling fluid, the drilling fluid which is already handled enters into drilling fluid system from the overfall of the swirler. The drill cuttings, barite and a little liquid phase discharged from the underset and go to the highly detail screen. Because of the granularity of barite is 2~74um mostly, it will return to the drilling fluid system with the liquid phase and the drill cuttings which are smaller than the sieve mesh, the drill cuttings which are larger than the sieve mesh will be discharged from screen surface. In this way, mud cleaner cleans the drilling fluid, stabilizes the performance of drilling fluid and recycles the barite and the liquid phase.

Shale Shakers: separation by vibratory screening

One method of removing solids from drilling fluid is to pass the mud over the surface of a vibrating screen. Particles smaller than the openings in the screen pass through the holes of the screen along with the liquid phase of the mud. Particles too large to pass through the screen are thereby separated from the mud for disposal. Basically, a screen acts as a “go-no-go” gauge: Either a particle is small enough to pass through the screen or it is not.

Screening surfaces used in solids control equipment are generally made of woven wire screen cloth, in many different sizes and shapes. The following characteristics of screen cloth are important in solids applications. Screens may be constructed with one or more LAYERS. NON -LAYERED screens have a single screen cloth mounted in a screen panel. These screens will have openings that are regular in size and shape. LAYERED screens have two or more screen cloths, usually of different
mesh, mounted in a screen panel. These screens will have openings that vary greatly in size & shape.

Shale Shaker

Vibrating Mechanism

The purpose of vibrating the screen in solids control is to tumble the solids particles to separate fluids from solids and increase through put capacity. This vibrating action causes rapid separation of whole mud from the oversize solids, reducing the amount of mud lost with the solids. For maximum efficiency, the solids on the screen surface must travel in a predetermined pattern. For example; some devices use elliptical motion and others use Linear motion to increase efficiency.
The combined effect of the screen and vibration, result in the separation and removal of oversized particles from drilling mud.

 

NOV Brandt MINI COBRA 2-PANEL SHAKER

MINI COBRA 2-PANEL SHAKER

The National Oilwell Varco Brandt Mini Cobra 2-Panel shaker utilizes two pretension screens and linear motion to remove detrimental drilled solids from the mud system. This allows the Mini Cobra shaker 2-Panel to minimize mud losses while enhancing cutting dryness. Maintenance on the unit is minimal and only a small inventory of replacement parts is necessary to sustain optimal operation. The small footprint and low weir height of this shaker makes it ideal for workover and small drilling rigs. Additionally, the shaker’s rugged design offers years of reliable operation.

Features and Benefits:

FEATURES

BENEFITS

Unique, rugged basket design

Provides optimal mud coverage of screen surface

Few replacement parts

Small parts inventory provides cost savings

Linear motion

Solids are separated and quickly discharged with minimum attrition

Exclusive deck angles (0°, +5°)

Keeps the mud pool volume small, which helps to increase screen life

Small footprints

Allow for installation in areas of confined space

Low weir height

15 in (381 mm) allow for installation in tight areas

Utilizes two (2) repairable, pretension screens

16.8 ft2 (1.6 m2) of screen area which is repairable, thus offering cost savings

Individual seals on every screen (VNM series)

Screen seals eliminate screen leakage

Patented pin-and-hole screen securing system

Screens fit snugly and will not slip or slide once secured

The structure of linear motion shale shaker

At present, in the drilling fluid processing industry, people use the linear motion shale shaker basically. The following is the structure combination of linear motion shale shaker.

1 Screen box dip angle adjustment:

Screw rod lifting adjustment;

Hydraulic pressure adjustment. (manual operation or motor-driven)

2 Vibration motor type:

Macroaxis vibration motor from Martin;

Minor axis vibration motor from Martin;

Domestic motor.

3 Shaker screen tensioning manner:

Quick-changing tension manner;

Tension bolt.

4 Shaker screen type (customized):

Hookstrip Flat Screen;

Pyramid Screen.

5 Screen box combine type:

Single shale shaker;

Duplex shale shaker;

Multi shale shaker.

6 The number of plies of screen:

Monolayer screen;

Double-deck screen.

 

High quality Shaker Screen in oilfield

The combination property of drilling fluid shale shaker is reflected by sieve size, service life, and the treating capacity, moreover the above-mentioned situations are bound up with the structure and performance of screen. Screen is the important part in sieving, and is a kind of easy consumable in drilling.

Therefore we should pay attention to maintain shaker screen. Before every shut off, the shaker should run without any medium for 5-10 minutes, at the same time, use clean water to flush screen clean.  There should be not much sediment on shaker frame and shaker screen.

Choose suitable mesh of shaker screen is also important. Usually, when the shale shaker is first stage solids control equipment the shaker screen can be 30-100mesh. When the shale shaker is a part of desander or desilter, the shaker screen  will be 80-200mesh. Simply speaking, if the mesh number is larger, the sieve size is smaller, the handling capacity will be reduced at the same time. Of course, the selection is relative with drilling mud property and our working condition at the drilling job site.

The following is the common used shaker screens in oilfield drilling.

Any interest or questions please contact our company freely.

 

 

Four panel shale shaker for sale

DCS700-4 Shale Shaker is mainly used for drilling fluid separation in oilfield drilling. It is consist of deck adjustment, vibration motor, shaker deck, base frame, support, baffle box, explosion proof starter, shaker screen, wedge plate, torsional spring, etc.

DCS700-4 Shale Shaker Parameters:

Treating capacity: 572GPM

Screen area: 2.94㎡(4 panels)

G-force: ≤7.0G (adjustable)

Motor power: 2×1.72KW

Vibration mode: Linear motion shale shaker

Amplitude: 5~6mm

Angle of Screen: -1°~5°

Features of DCS700-4 Shale Shaker:

To guarantee the durable structure of the shale shaker, the material is the GB steel from Beijing Shougang Company Limited, Shanghai Baogang Iron and steel Co., Ltd. and Tangshan Iron and steel Co., Ltd.

The used vibration motor is from the Italia joint venture Company named Oli. The motor has much advantage, like high strength vibration, large screening size, adjustable screen box angle, little noise, excellent performance and high efficiency.

Shaker screen will be tensioned by wedge plate, this is more convenient and easy for operation it is very reliable.

Shaker deck is adjustable, the adjustment is worm wheel and screw type. Beside shaker deck two sides middle shaft is connecting two worm, when we make adjustment the shaker deck will be consistent and in-phase.

The complete shaker body will be treated by sand-blast, paint it by anticorrosive painting so it is more anti-corrosive and better appearance.

Any interest or questions please contact DC Machinery freely.

 

Shale shaker screen manufacturer from china

Shale shaker screens  are important spare part for shale shaker. Even for general solids control equipments, shaker screen is rather consumable.

Shaker screen types will be divided into various types according to different standard.Totally including flat screen, pyramid screen, steel fram screen, soft/hard hook strap screen, composite screen, PU screen, etc.

Furthermore, shaker screens also divided into single layer, two layers and three layers screens. Then, subject to shale shaker screen mesh size including common mesh screen, fine screen, super find screens. We have all types screen for sale. The flat or PMD, the hook striped or wedge clamped.

                                   

 

The following is Screens API size

The API RP13C is rather essential international standard. These standard issues including the API screen size, D100 cut point range, conductance, non blanked area. Generally, from 20-400 or API20-API425 for shale shaker.

If we request API140 screens its opening size is about 104microns while the cut point range is 98~116.5microns, while the conductance is variable according to different design and different manufacturer.

Commonly it will be 0.99~2.24, etc. None blanked open area determined by labeling and measuring every opening on two production screens.

So, when we select or purchase shaker screens, the API size is universal and standard one. You can tell us the API number or the mesh size, either the cut point of separated particles.

DC Machinery short for TangShan DaChuan Machinery Co.,Ltd. China’s leading manufacturer in regard to shale shaker screen as well replacement screen for all types of shale shakers in the oilfield drilling industry, produces high quality shaker screens, including above listed brand and model. The price is rather competitive with reliable quality. The usable life is variable as per different working condition or mud property. However, commonly, it can be used 10-14 days. And the price is very reasonable and cost-effective.

If you are interested in shaker screens, please enter in our website.

 

Mud System shaker screens

The combination property of drilling fluid shale shaker is reflected by sieve size, service life, and the thruput, moreover the above-mentioned situations are bound up with the structure and performance of screen. Screen is the important part in sieving, and is a kind of easy consumable in drilling.

Shaker screens are widely used on shale shaker  and mud cleaners. Some producers will fix shaker screens on Desander and Desilter.

Because of the drilling fluid has corrosivity, abrasiveness and heat, and needed to eliminate solid particles for a long time, so generally, the material of shaker screens are all made of stainless steel wire which disposed by heat treatment technology, moreover, auxiliary support structure are made of steel plate, galvanized sheet, plastic plate, etc.

Usually, shaker screens are combined with 2-3 layers s.s wire mesh, one steel or composite frame, glue, and paint. Some of the pre-tensioned frame shaker screen will request rubbers also.

We weave stainless steel wire mesh firstly, then stick wire mesh and frame together with glue, then we paint whole shaker screen. Finally, we will fix the rubber on the shaker screen back side.

DC Machinery can provide various shaker screens, high quality, reasonable cost, is your best choice.

 

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