Sifting bed structure of oilfield shale shaker

Shale shaker separates solids from liquids by utilizing a vibrating basket, that might be outfitted with specially-designed and -sized screens in oilfield drilling mud solids control system. Shaker is regarded as primarily essential solids control equipment of the most necessary tool for removing drilled solids. These units take away the majority of drilled solids generated through the widespread drilling course of action. Shale shakers normally create involving 5 to more than eight G-forces of energy for removing solids in the mud plan.

Shale shaker

KOSUN screen basket is of weld components and vibration motor & screen plate base are installed on screen box by parts. Screen basket locates on the adjustment beam and there are bumper springs in four corners near the screen box, which can avoid the screen basket vibrating effect on parts & devices in the neighborhood.

There are three or four screen panels on the enough strength for screen basket.
The middle part of screen basket is higher than two sides transversely and the bulging arch the screen can be tensioned more easily and the screen life and efficiency of removing solids particles can be improved as the work proceeds.

Shaker screen is also used in desander, desilter and mud cleaner to separate the solids in the drilling fluids solids control system.

Shale shaker isn’t only made use of inside the oilfield mud solids control system but in addition applied inside the HDD,CBM,TBM and Dredge slurry separation, which is in a position to separate the bigger solids as much as 780 microns. Inside the oilfield business, shaker is with top-hole sections which save the tank space and simply obtain the high volume drilling fluids..

Throughout the oilfield solids handle program, shale shaker could generate strong G-forces and its successful vibrating motion can swiftly eliminate the solids from screens and particles from drilling hole. KOSUN certified shale shaker is able to reach the aim.

Industrial decanter centrifuge for sewage treatment

Industrial Treatment Plant Sludges: Municipal and industrial wastewater treatment plants are designed to produce a clean, safe water discharge within the required limits. The complexity of the plant will depend on the immediate environmental considerations and the consent limits negotiated with the authorities. New plants built today are becoming more and more sophisticated and decanter centrifuge is extensively used for liquid-solid separation, sludge dewatering, and sludge thickening applications.

Decanter centrifuge

For the purposes of this overview on typical Decanter Centrifuge applications, we will consider only the basics. There are basically (2) two decanter centrifuge applications in the municipal and industrial wastewater treatment facilities and wastewater treatment industry:

The first is to feed to the decanter centrifuge liquid slurry (around 1 – 3 % dws.) and thicken it to approximately 8% dws, often prior to feeding the thickened material to a biological digester.
The second is to feed the decanter with similar slurry and dewater the solids to a relatively dry stackable cake of leach free solids prior to transportation or disposal. In the second case the solids can come from the primary clarifier or the secondary clarifier after biological treatment.

A simplified and typical flow-chart for wastewater applications is shown below although not all process steps are present, particularly for industrial wastewater.
The range of decanter centrifuges is ideally designed for these applications. Controlling the decanter centrifuge operating parameters optimizes the consistency of the discharged sludge.

Sludge discharge consistency can be regulated to suit the disposal requirements. Slurry for land application should be thickened to reduce the volume of water but still needs to be fluid enough to be easily spread or evenly pumped for land application. Digester feed slurry can often be thicker but typically requires a pump-able sludge. When the discharged sludge will be disposed of via landfill, dewatering the feed slurry to a stackable consistency reduces weight, volume and disposal costs.、

Besides, in whole drilling mud solids control system, decanter centrifuge also plays an important role. Decanter Centrifuge is used to separate suspended solids ≥2μm in diameter and treat the drilling mud and fluids. It is especially effective when used in oilfield service industry, industrial service industry and especially in environmentally sensitive areas. This type of centrifuge is high in recovery rate, effective in solids control and remarkable in the reduction of cost spent on drilling mud resupplying and management. It is a very sophiscated dynamic balancing machine, able to operate stably with the whirling speed ranging from 0 to 3900 and generate centrifugal force of 3000G.

As the China solids control leader and drilling waste management expert, KOSUN provides all the drilling solids control equipment for the drilling fluid circulation system, all the products can be manufactured on the requirements of the customers. KOSUN Drilling Shale Shaker and Decanter Centrifuge are the hot products, they are applied to the oilfield in many countries and also win much praise from the customers all over the world.

The affect of solids in mud for oil gas drilling

In drilling mud, solid content is a fraction total solid, and it always increases while drilling ahead because of drilling solid (cuttings), mud chemical additives and weighting material. When we talk about the solid content, we always mean soluble and insoluble solid content in the drilling fluid system.

There are three types of solid contents as listed below;
- Soluble material such as salt
- Insoluble high gravity solid (HGS) as weighting agents (barite, calcium carbonate, hematite, etc.)
- Insoluble low gravity solid (LGS) or drilled solid as solids particles from cuttings

The drill solids are the worst solid content in the drilling fluid because it gradually deteriorates mud properties. Moreover, if its particle size is less than 5 microns, these drill solids could not be removed by mechanical methods, and they will stay in the mud forever. Generally, the drill solids will take 6-7 percent of total mud volume. Since the drilled solid content is very important, it must be checked daily. For good drilling practices, the drilled solid should be tested twice a day by retorting. The upper limit of the drill solid faction should be 6-7 % by volume or approximately 55 – 60 lb/bbl. Please remember that this figure is general rule of thumb. Practically, you can drill with more solid content for a while but over all performance will be down.

Another value besides the LGS and HGS that you must contemplate is the average density of solids in the drilling fluid. I will explain why this figure is important and what it tells us. The weighting materials as barite, Calcium Carbonate, etc have a specific gravity value about 4.2. However, the drilled solids as clay and silt have a less specific gravity about 2.6. The average solid density means the relative concentrations of both the weighting agent and the drilled solid. Normally, the acceptable value of the average solid density is about 3.8 or higher. If you see this value below 3.8, it indicates that there may be too much low gravity solid in the mud.

So we need to remove the solid in the drilling fluid and keep the performance of drilling fluid.Usually the drilling mud solids control equipment and system will be applied in to clean the drilling fluid.
In China solids control industry, KOSUN is a solids control leader and expert in drilling waste management. KOSUN is capable of providing customers with such four series as oil & gas drilling solids control equipment, centrifuge, drilling waste treatment equipment and drilling security equipment, including 25 categories of products, such as shale shaker, decanter centrifuge, shale shaker screen, desander, desilter, vacuum degasser, centrifugal pump,vertical centrifuge, submersible slurry pump, shear pump, mud agitator, mud gun, drilling fluid mud cleaner, jet mud mixer, screw pump, mud tank, diesel tank, water tank, complete solids control system, etc.

Drilling fluids shale shaker part shaker screen

Shale shaker screens are a part of drilling equipment used in many industries, such as coal cleaning, mining, oil and gas drilling. These screens are considered to be the first phase of a solids control system on a drilling rig. They are used to purify the liquid by removing large solids also called cuttings from the drilling fluid.
This processes minimizes fluid loss and is helps lessen the environmental impact of the process. Shaker screen is the primary solids separation tool on a rig. After returning to the surface of the well the used drilling fluid flows directly to the shale shakers where it begins to be processed.

Once processed by the shale shakers the drilling fluid is deposited into the mud tanks where other solid control equipment begin to remove the finer solids from it. The solids removed by the shale shaker are discharged out of the discharge port into a separate holding tank where they await further treatment or disposal.

In oil & gas drilling, shaker screens are used not only on shale shaker, but also desander, desilter and mud cleaner to separate the solids in the drilling fluids. In different period, people invented different types of shaker screens, such as conventional flat screen, corrugation screens, and with square meshes, hexagonal meshes, diamond meshes, etc. And different geological condition may require different ability and type of shaker screens. But in different times, people used different ways to describe the ability of screens.

The shaker screen is equipped on the basket of shale shaker, with three or four pieces screen panels, while the screen basket is driven by two sets of vibration motors which are mounted on the top of shale shaker with synchronization and contrary rotation. There exists one piece of eccentric block in the vibration motor. When motor works, the eccentric block also rotate. As there are two sets of vibration motors working synchronized, at some point, the vibration force that generated by the eccentric blocks is sum of these two blocks effect force. While at some point, the vibration force of motors would be zero.