Linear Shale Shaker Work Theory

Linear shale shaker’s vibration is from the inertial vibrator. The linear shale shaker has a motor driven vibrator, vibrator with two axles, and eccentric weight on each axle (Fig. 2-1), and rotates in the opposite direction, so it is also called linear vibration shale shaker, by the two meshing tooth wheel to ensure synchronization. When two with eccentric disc rotates, the centrifugal force two eccentric weights generated by F, offset each other in the X axis component, in addition components of the Y axis, the exciting force which results in a back and forth in the direction of Y axis, the linear track vibration sieve box reciprocating in the Y axis direction.

When using the linear shaker vibration motor vibration source, two sets must be arranged in line with its axis linear shaker longitudinal axis direction (not parallel, with an angle). Upper or lower position is both suitable for the two vibrating motors and symmetrically arranged on the screen box. Its linear shaker operation explain as below picture.

Linear vibrating shale shaker screen inclination is usually below 8 °the screen surface vibration angle is generally 45 °, sieve shaker role mainly as the linear reciprocating motion. Particles produced in the projectile and fell face down shaker, so that the material on surface of the screen during vibration constantly moving forward. Projectile and the whereabouts of the material has an impact both on the screen surface, resulting in less than sieve particles are screened separated. Inclination, vibration angle of the shaker screen surface, projectile coefficient of materials sieve screening efficiency and production capacity (capacity) with the screen surface related. In order to guarantee the same high screening efficiency, production capacity sieve, you must select the appropriate Ky (projectile coefficient) values, Ky value given the same screening round vibration method.

Shale Shaker-Basket Mechanism

The shale shaker basket should be capable of adjusting its angle to accommodate numerous flow rates of drilling fluids in the solids control system and to maximise the utilization of the shaker bed, this can be wherever the fishing mechanism plays a vital half.
The lubricant flowing over the shaker bed is selected into 2 categories:
Pool: that is that the space of the screening deck that consists principally of lubricant with trained cuttings suspended inside it.
Beach: is that the space wherever the fluid has been principally faraway from the cuttings and that they begin to appear sort of a pile of solids.

As a rule of thumb the Beach and pool area unit maintained at a quantitative relation of eightieth pool and two hundredth beach, this in fact will modification reckoning on the necessities of cutting waterlessness and flow rates.

The mechanism plays an important role in solids control.
There area unit numerous fishing mechanisms presently in use that vary from hydraulic to gas and mechanical, they will be controlled from either one facet of the shaker or should be adjusted one by one per facet. Mechanical fishing mechanisms usually will be terribly dependable often requiring less maintenance however typically take longer to control than their hydraulic or gas counterparts wherever because the hydraulic/pneumatic fishing mechanisms area unit a lot of quicker to control and need less a physical means that of operation.


Brightway Shaker deck angle adjustment:
There are lifter, pipe, lifter pipe, scale indicator, scale, connection plate, etc. When we make adjustment, handle wheel rotary by clockwise, shaker deck angle will be larger; handle wheel rotary by anti clockwise shaker deck angle will be less.
Shale shaker output angle adjustment can be operated under running and off. When finish the shaker deliver it, the shaker deck is 0°. When user operate shaker, according to drilling mud property and flow rate on job site, and adopts same shaker screen, the angle is higher, the treating performance will be better while treating capacity will be higher. When drilling fluid is leaking on shaker deck, increase deck angle can get rid of fluid flow away.
Angle is 0~ +5°

HOW JET MUD MIXER WORKS

The JET MUD MIXER is used to make up drilling fluid or increase total amount of the drilling fluid, change the fluid density, viscosity, and dehydration. When making up again, put the materials of drilling fluid (such as betonies and barite powder) and corresponding chemical additives (such as polymer) into the recycle tank through the jet unit. If put them directly, the materials of drilling fluid and chemical additives will be deposited largely or dump together and we can’t obtain diffused and well-proportioned drilling fluid.

BWSLH jet mixing device is a unit used together with the solid control system for petroleum drilling. It is suitable for drilling from 1,500 meters to 6,000 meters and can strengthen and make up drilling fluid through the fixed control system horizontally. The unit includes one sand pump, one jet mixing funnel and one jet mixer that are installed in a base with pipe valves. It is safe and stable and can be moved conveniently.

Installation and Application

1. Installation

(1) According to the on-site situation, the tank should be at the same level as the slurry tank.

(2) Connect the suction inlet of the pump to the tank body with hoses.

(3) At the outlet, connect the jet mixing to the inlet of the tank with creeping pipe.

(4) Switch on the power, and see if the rotation direction of the sand pump is right.

2. Application

(1) For operation and maintenance of the sand pump, see its operation and maintenance instructions.

(2) BWSLH jet mixing device is shown as the figure.

(3) Before use, open the inlet butterfly valve of the sand pump. Then start the sand pump. When the sand pump runs normally, open the inlet butterfly valve of the funnel, then add the materials of drilling fluid (such as betonies and barite powder) and corresponding chemical additives (such as polymer) from the funnel to strengthen and make up the slurry.

(4) Before stop the pump, close the inlet butterfly valve  of the funnel to prevent the instant pressure decrease, which resulting in overflowing of slurry from the surface of the funnel.

(5) In winter, when BWSLH jet mixing device stops working for a long time, close the suction inlet butterfly valve 1, then loosen the pipe plugs under the casing of the sand pump and ones under the inlet pipe of the funnel to drain the slurry to prevent the pump body and pipeline from being blocked and frost cracked.

Comparison Between Brandt Mud Agitator and Brightway Mud Agitator

Let's have a comparison between Brandt mud agitator and Brightway mud agitator.

HIGH QUALITY AND TIME-PROVEN MECHANICAL AGITATION
Agitators serve the drilling industry with high quality and time-proven mechanical agitation.
VMA
The VMA agitator is vertically mounted, reducing the footprint requirement. It offers a motor with a vertical direct mount to a helical inline gearbox with a drop bearing configuration.
Impellers
Impellers are available with flat blades (radial flow), contour blades (axial flow) and canted blades (radial/axial flow). The impellers are sized according to tank volume and expected duty. Active mud system compartments - such as solids removal sections, mud mixing sections and slug pits - which need a higher shear force to produce immediate mixing, are another consideration in impeller sizing.
Shafts
Several types of shafts are offered.Mild steel shafts are cut to length and joined to the gearbox output shaft with a rigid coupling. Solid shafts are keyed at the bottom for adjustment of impeller height. Hollow pipe shafts are available for deep tanks. They are supplied in flanged sections and bolted together making them ideal when lifting height is limited.

Brightway oilfield mud agitator features a “C” face motor couple to a rugged oilfield gearbox, which eliminates misalignment and troublesome couplings. This configuration promotes long motor and gearbox bearing life. Mud Agitator is used in mud systems to suspend solids and maintain homogeneous mixture throughout the system.

Mud Agitator Features and Benefits

1. Structure: Small footprint and compact structure

2. Reduction gearbox: Helical-bevel design or worm design according to customer requirement

3. Motor: Explosion-proof electrical motor, and can be the style of horizontal or vertical

4. Shaft and impeller: Galvanizing treatment brings the excellent anti-rust performance much better than the painting process

5. High efficiency, low noise, low operating temperature.

Mud Agitator introduction

 Mud Agitator is used in surface mud systems to suspend solids and maintain homogeneous mixture throughout the system. A mechanical agitator is driven by an explosion-proof motor, coupled to a gear box that drives the impeller shaft. The impellers (turbines) transform mechanical power into fluid circulation or agitation. The objective is to obtain a uniform suspension of all solids.

Types of Agitator Mounting
Horizontally mounted agitator
Vertically mounted agitator

Types of agitating shaft seal
Mechanical seal
Packing seal

Types of Agitator Impellers
Radial Flow Impeller.  a radial flow created by the impellers wherein the circulation is predominantly horizontal.
Axial Flow Impellers.  an axial flow created by the impellers wherein the circulation is predominantly axial fluid movement.

Types of Impeller Blades
Flat blade impeller
Canted blade impeller
Contour blade impeller

Brightway have shipped 10 sets of mud agitator to our Middle East customer on Nov 4, 2013.
These mud agitators will be used in the oilfield project in the Middle East. Except the auxiliary equipment -mud agitator, Brightway is professional in producing the complete solids control equipments of the solids control system, such as shale shaker, vacuum degasser, mud cleaner, centrifuge, mud gas separator, etc.

mud agitator

HOW MUD CLEANER WORKS?

Desanders are used to separate sand which is mixed with drilling muds. During drilling process mud is being poured as excavation is getting deeper, this mud also mixes with soil, thus being contaminated with sand and silt, in such a way, that when excavation is finished, it is necessary to recycle mud in order to separate sand from mud and get a clean mud that will be used in next excavations. Each country establishes its own regulations on maximum allowed sand content in drilling mud before concreting operation is carried out, in order to prevent concrete contamination with sand and soil, and Desanders are used for this purpose.

A desilter is used to separate silts from drilling muds. The cut point can be as low as 7-10 μm. As muds are being used in drilling operations, they are contaminated with silts. In order to use again these muds, it is necessary to separate silts and also to recycle muds to dispose them at the end of work duty.

Mud cleaner is the combination of desander and desilter.

Brightway offers a line of mud cleaners that employs a two-stage separation process for the ultimate in drilling fluid recovery. Our mud cleaners use a combination of hydrocyclones mounted over a shale shaker to operate as a single unit. 

Brightway mud cleaners are designed to handle the entire circulating volume to remove and dry solids while retaining premium base fluid. They are equally effective for both weighted and unweighted drilling-fluids.

With our mud cleaners, the hydrocyclones make the primary separation with underflow directed onto the shaker vibrating screen. Brightway mud cleaners have been proved effective in lowering both drilling-fluid and disposal costs.

MUD GAS SEPARATOR

Mud Gas Separator is commonly called a gas-buster or poor boy degasser. It captures and separates large volume of free gas within the drilling fluid. If there is a "KICK" situation, this vessel separates the mud and the gas by allowing it to flow over baffle plates. The gas then is forced to flow through a line and vent it to a flare. A "KICK" situation happens when the annular hydrostatic pressure in a drilling well temporarily (and usually relatively suddenly) falls below that of the formation, or pore, pressure in a permeable section downhole, and before control of the situation is lost.
It is always safe to design the mud/gas separator that will handle the maximum possible gas flow that can occur.

The principle of mud/gas separation for different types of vessels is the same.
• Closed bottom type
• Open bottom type
• Float type

The closed-bottom separator, as the name implies, is closed at the vessel bottom with the mud return line directed back to the mud tanks. Commonly called the poor boy, the open-bottom mud gas separator is typically mounted on a mud tank or trip tank with the bottom of the separator body submerged in the mud. Fluid level (mud leg) is maintained in a float-type mud gas separator by a float/valve configuration. The float opens and closes a valve on the mud return line to maintain the mud-leg level. According to pedestal or base type there are
• Fixed type
• Elevating type
Poor boy degasser in China is usually named according to vessel diameter.
Brightway have the below models for mud gas separator.
• ZYQ800
• ZYQ1000
• ZYQ1200