We are very familiar with the process of settlement, where solids in liquid fall down to the bottom of a container, leaving liquid phase crystal clear. This is the case when we sit a cup on top a desk, fill it with water including some solids. After some time the solids will settle at the bottom. Equipment like this is called clarifier.

However, this process happens in natural gravity and it takes too long for the solids to settle down. Then people thought centrifugal force may help to speed up this process. So they tried to tie a bottle on one end of a rope and rotated the rope at certain speed. They found that the settlement happened much quicker. This initiated the decanter centrifuge, which works on the same principle as the rope except that decanter is more complex, withstand more load, and make the settlement process much faster.

With decanter centrifuge the separation of solids from liquid is greatly expedited. For instance it can take hours for solids to separate from liquid while it takes only a few second to achieve the same result. This is because G force generated at decanter centrifuge is a few thousand time that of regular gravity.

There are many factors controlling the performance of decanter centrifuge, but among them the following four factors are most influential.

1. Centrifugal force generated. This determines separation efficiency. When the gravity difference between solids and liquid become very small, exceptional strong G force is need to separate solid from liquid. This also applies to small particles, in the magnitude of microns, as buoyance is in the same magnitude of gravity force an the particles will float in the liquid;
2. Differential speed required to send settled solids from decanter centrifuge
3. Design of screw conveyors
4. Settlement section for particular type of applications.

There are much more considerations in practical applications.

Many people know that decanter centrifuge works on the principle of centrifugal force, which makes heavier solids to settle down on bowl wall and lighter liquid phase to “float” on top of the deposited solids. However, there is much more to take into consideration when decanter centrifuge is to be applied to different applications.

The first consideration is the capability required to in the production process. This can differ tremendously, from a few million liter per minute to thousands of cubic meters per hour. This is mainly due to economic consideration.

The other consideration is the length and diameter of rotating bow. The longer the rotating bowl, the longer slurry takes to travel the whole length, and therefore better settlement of the solids. This is particularly important when lighter solids phase is to be separated from the liquid. If the solids is much heavier, such as barite in drilling process, bowl length does not need to be that long. It is common for the length of rotating bowl to be 2, 3 or even 4 times the diameter of rotating bow.

Another consideration is the conical section of decanter centrifuge bowl, this concerns the texture of the solids to be separated. If solids is easily compactable, a bigger angle can be applied so as to increase throughput speed. However if the solids to be separated is quite lose, and difficult to get compacted, a gentle angle is usually required to have them compressed properly before being discharged from the rotation bowl.

One important factor is the centrifugal force. There is much to consider when this factor is to be considered. In a slurry there is always liquid in between solids particles. The finer the solids particle is, the more liquid content, therefore a much larger centrifugal force will be needed to move liquid content out from between solids particles.

Drilling activity is the process to establish communication channels for oil and gas to rush up to the ground. There must be a big number of mud tanks to support the normal progress of oil and gas drilling. Usually these mud tanks need to be cleaned, to prevent cross contamination, to prepare the tank for inspection, or simply for storage.

This task is usually done by people. Workers will wear heavy protective clothes, and use respirators, to go down inside the mud tank to clean the interior of mud tanks manually. As there is no lighting in the tank, illumination is required as well. As drilling technique is getting more and more complex, a lot of chemicals are added to drilling mud. These chemicals may be a serious thread to the workers. Confined space, potential toxic material (liquid or gas), dim environment, high temperature are big risks to people exposed to it. This inevitably give tension to people’s psychology and impact work efficiency adversely.

GN Solids Control has been involved in finding a good solution to get rid of this problem. After years of research and development work, GN Solids Control worked out the first generation of automatic tank cleaning system a few years ago. People at drilling rigs gave high appraisal to this system as it released them from difficult and dangerous cleaning environment. They also pointed out issues with the application of the system, which helped GN Solids Control to continue its R&D to make the system better.

Recently GN Solids Control released its third generation of automatic tank cleaning system. Compared to previous generations, the new system features the following:

1. High efficiency. The new system can clean a mud tank in 20 minutes. Compared to 6 to 9 hours needed to clean a mud tank by 4 people, the new system only requires at most 2 people. This increase mud tank cleaning efficiency substantially;
2. It minimizes worker’s exposure to difficult and confined space. All system operation needs to do is to mount the cleaning head inside mud tank and all other work will be done automatically. Some clients of this system have huge number of mud tanks to clean. They use top cover mechanism to lower cleaning head into mud tanks. This eliminates the exposure of people to risky environment.;
3. Water consumption is minimized. Water is valuable, especially in remote area where drilling rigs are located. Drilling rigs often have very limited water supply and do not want to use their water, which is usually trucked in from far away. Manual cleaning used open loop process – flushed down slurry will be dumped and the water is wasted. This new style automatic tank cleaning system contains solids-water separation equipment, which can settle solids down efficiently and reuse the water for cleaning. It significantly reduced water consumption, the quantity of slurry dumped to the environment, and the cost to truck the slurry to recycling station & to truck in fresh water;
4. New technology increases solid/water separation efficiency. This system can provide high flow rate to provide enough cleaning media and good pressure to wash mud tanks. If natural settling technique is used for such high flow rate, separation result can not be guaranteed. GN Solids control uses new technology which can separate solid from the slurry effective and efficiently and return clean water back to the cleaning head. Field experience shows that most of the solids are separated from slurry and cleaning quality is well secured;
5. GN Solids Control also uses other new technology to transfer slurry from mud tanks to the cleaning system, which can not be achieved by routine technique;
6. Automatic control. This system can also automatically control system operation to prevent dry suction or tank overflow.

There are other new technologies GN Solids Control uses to make the system do its job as is intended. Please contact us for more information and solutions for your tank cleaning needs.

There is always the need to transfer material other than liquid from one place to another. Examples are everywhere, from coal mine to construction side, from steel mills to agriculture.

There are many ways to transfer such material as well, from trucking, to tanking, etc., featuring high cost and low efficiency.

There is limitation for the above means of transferring non-liquid material too. For instance, transferring coal bring the potential of environment contamination. Other means of the movement of such materials is in bad need.

Vacuum pump manufactured by GN Solids Control solves this problem.

GN vacuum pump can transfer sludge, solids particles ( no more than 50mm or 75mm in size) to locations up to 1000m from pump location.

GN vacuum pumps uses venturi pipe to generate vacuum, and sucks sludges from tanks, pits, etc., and sends them to the closed buffer tanks. After a pre-set material level is established inside the buffer tank, the vacuum pipe will stop sucking and compressed air is applied into the tank to force the material inside the buffer tank to go outward. Because the high pressure of the compressed air, sludges can be transferred a long distance.

The advantages of GN vacuum pump are:

1. Safety. For instance mine camp waste can be safely transferred by vacuum pump. Other material such as life sludge can be transferred without affecting the health of the operator;
2. Environmentally friendly. Because the complete sucking & discharing & transferring process is done in a sealed pip route, no material is being leaked out from the route and there is no contamination to the environment;
3. High efficiency: GN vacuum pump has the capability of 10m³/h, 20m³/h and 40m³/h without the assistance of other machinery;
4. Flexibility: GN vacuum pumps can be used to transfer sludge, liquid, solids, tail mine, construction waste, from tanks, pits, river, etc., almost from any locations;
5. Versatile. Such pumps can also be used as a mobile equipment. It can be mounted on a truck, on a boat. For instance, it can be mounted on a vessel, suck up a dredge in a water surrended location, and transfer the dredge to the land.

GN vacuum pump has great potential in industry and daily life. If you have want to know more about this vacuum pump please visit www.gnsolidscontrol.com.

On drilling site there are many mud tanks for the normal drilling operation. Mud tanks are not high tech, but they are indispensable.

When drilling rigs need to switch from one kind of mud to another, mud tanks need to be thoroughly cleaned so that drilling muds would not crossly contaminate.

Traditional tank cleaning method is manual. Workers with heavy protection clothes enter mud tanks, exposing themselves to the hazardous enclosure and apply high pressure solution spray to clean mud tanks. This process is tedious and labor intensive, in hazardous environment. Sometimes the drilling rigs are in urgent of clean mud tank, and the only way to speed up is to clean the mud tanks with more workers, which adds economic burden to drilling operation.

In order to solve this problem, GN Solids Control performed extensive research, and in-depth development work. The result is GNTC-30 series automatic tank cleaning system.

The system composes of a buffer tank, which stores cleaning solutions. A powerful centrifugal pump pressurizes the solution and send liquid to tank cleaning machine (TCM). TCM is a well-engineered sprayer, which can scan the inside of mud tanks at pre-set scanning pattern. Usually tank cleaning is finished with one complete scanning cycle. If super clean inside is needed, say for very expensive drilling mud for critical drilling, secondary scanning is deployed.

Suck pump will collect fluid on the floor of mud tank and transfer the fluid to a inclined plate clarifier(IPC) by GN Solids Control, through a filter, which stops big items such as screws, big drilling cut from entering such pumps. It is quite normal that a lot of barite would deposit on mud tank floor. Because of its cost, barite needs to be recovered. So suck pump should be able to transfer heavy barite.

Once the sucked-in liquid is transferred to IPC, this highly efficient clarifier quickly separate solids including barite and solution. Solids will go to the bottom of IPC. Clarity of solution increase with decrease in liquid depth, with the cleanest water on the surface of liquid. This clean water will overflow to buffer tank, to be pumped again to clean mud tank to establish closed loop system.

The IPC by GN Solids Control has specially designed shape, which allows quick establishment of solids inside the tank. A membrane pump will transfer the deposited solids, including barite, to collect bin.

One major advantage of such automatic cleaning system is its efficiency. In general, a mud tank can be cleaned in 30 minutes. This is much more efficient compared to the manual cleaning process, which usually takes hours of hard labor work.

Another advantage of such system is safety, because exposure to hazardous enclosure is minimized. Operators only need to enter mud tanks to setup cleaning machine, and the rest of the cleaning process is done by the machine, with operator working on the outside.

GN Solids Control is continually to developing more efficient, more intelligent automatic mud tank cleaning system for different applications.

Three 600GPM non-excavation mud recovery systems sold to Asian countries. The three sets of 600GPM non-excavation mud recovery systems ordered by Asian customers have been prepared after strict production, assembly and test procedures. 600GPM non-excavation mud The recycling system is compact and easy to transport. The customer is very satisfied with the design concept and production efficiency of the crown energy control. In the field of non-excavation mud recovery system generation, GN Solids Control can design product solutions according to the actual situation and needs of customers, reduce costs and improve efficiency. Our customers are very satisfied with this.

The three sets of 600GPM non-excavation mud recovery systems ordered by Asian customers are the same. The main products are vibrating screen, desilter, 40-foot standard mud tank, mixing funnel and  Centrifugal  pump and other auxiliary equipment. 600GPM non-excavation All equipment and electrical components on the mud recovery system are equipped with international famous brands such as Siemens, Schneider, ABB, etc. The mud-removing cyclone is made of high-wear composite polyurethane material, all equipment paints are selected from marine anti-corrosion paint, and all accessories are internationally renowned. Brand names are interchangeable. The 600GPM non-excavation mud recovery system fully meets the needs of the local market for tropical climate environment construction. On-site Asian customers can maximize the use value of each equipment during use, and achieve the best mud purification and recovery effect.

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The oil-based drilling cuttings system sold by GN Solids Control to PetroChina has been well received by customers. GN Solids Control has been unanimously recognized by customers for its good use of field equipment. GN Solids Control equipment personnel are designed according to the actual situation of customers. The oil-based drilling cuttings and drying system has once again been recognized by the leaders of the CNPC and the well team workers. After the treatment by the GN Solids Control’s cuttings and dry system, the treatment cost of the mud transportation is reduced and the environmental requirements are met. The foundation drilling cuttings drying system is very popular among customers.

At present, the oil-based drilling cuttings drying system produced by GN Solids Control has formed a complete armored system through strict production, assembly and testing processes. The whole system centrifuge and cuttings dryer are placed on one tank. It is composed of auxiliary auxiliary equipment screw pump and electric control. The cuttings dryer can discharge debris. The liquid phase discharged from the centrifuge directly flows into the bottom collection tank. When the drilling fluid needs to be transported, it can be transported by a transfer pump or the tank can be connected to a tank of a similar height. The cuttings dryer is a single-stage continuous horizontal scraper centrifuge. The cuttings dryer can effectively recover the oily components in the cuttings, the processing capacity is 30-50 tons per hour, the oil content of the cuttings is less than 5%, and the discharge scraper is cast from high chromium cast iron. Long, the speed of up to 900RPM, can form a separation factor of 420G, effectively separate the liquid in the cuttings, the cuttings dryer separates the oil-based cuttings, and the oil in the composite drill cuttings. Thereby achieving the purpose of reducing harmful substances and recovering useful drilling fluid. Under the action of centrifugal force, the solid particles are pushed to the inner wall of the drum, and are pushed by the blades on the auger to the small end of the drum to discharge, and the liquid phase overflows through the overflow hole at the big end of the drum. This cycle continues to achieve continuous separation.

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GN Solids America

GN Solids Control A set of mud solid control system customized for CNOOC customers was successfully completed this week and will be sent to the customer site. This system is mainly a high-G drying screen system and a mud cleaner. The equipment will be used in offshore drilling platforms. After years of stable cooperation with CNOOC customers, the cement solid-control equipment products produced by Guanneng Company are highly competitive. The quality and service advantages of the company have been highly favored by CNOOC customers. The high-G drying screen system produced by Guanneng Company is mainly composed of high-G drying screen system and mud tank. The high-G dry screen company is designed to dry the drill cuttings, and the drill cuttings can be dried to a transportable state without Need to add any chemicals, high G dry sieve excitation strength up to 8.0G, and can be adjusted, can effectively dry drill cuttings, high G dry sieve box overall heat treatment, can meet long-term work under high excitation strength, the same can energy company The bottom frame of the screen box is designed to be stainless steel. The corrosion resistance and life of the screen are greatly improved. The high-G drying screen electrical control is designed by using international famous brand electrical components, Siemens or Schneider, high G dry sieve funnel feeding mode. The utility model effectively reduces the height of the slurry and facilitates the feeding of the conveyor. GN Solids Control design and manufacture of various types of tanks including mud tanks, water tanks, oil tanks, etc. The clay tanks supported by CNOOC customers are mainly used for storage of transitional mud, and the tanks of Guannenggu control are often used for installation. Solid control equipment, storage mud, configuration mud, etc. The mud cleaner cyclone produced by Guanneng Company adopts pure polyurethane material, which has compact structure and saves land. The screen box is made of stainless steel, and the motor and electric control are all internationally renowned explosion-proof brands.

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The 1500HP rig solid control system produced by GN Solids Control will be delivered to the Indian customer’s job site. The Indian customer came to our factory to visit and inspect before signing the contract with GN Solids Control. During the 1500HP rig solid control system program conversation, understand The business to customers is mainly concentrated in the oil and gas pipeline industry, and Indian customers have higher requirements for equipment handling. For the special needs of Indian customers, GN Solids Control’s  1500HP rig solid control system designed for Indian customers is compact and easy to use. Indian customers are very satisfied with this.

The 1500HP drilling rig solid control system produced by GN Solids Control mainly includes the following equipment: three GNZS703 series drilling fluid vibrating screens, the bottom frame of the screen box is made of SS316 stainless steel, the corrosion resistance and life is greatly improved, the overall heat treatment of the screen box, Siemens or Schneider components, A variety of feed feeding methods, back-type logging tanks, overhead logging tanks, funnel-type feed bins. A GNZJ703F-2S12N mud cleaner with 100% polyurethane material for compact structure and space saving. A GNZCQ360 series vacuum degasser can quickly remove various gases intruding into the drilling fluid during on-site use, which plays an important role in restoring the specific gravity of the mud and stabilizing the performance of the mud. A GNZYQ1000 series liquid-gas separator can effectively remove gas intrusion gas and ensure safe operation during drilling. Two GNZS8×6-13J sand pumps, sand pumps are mechanically sealed, wear-resistant parts are made of wear-resistant alloy ductile iron, and the whole machine base is integrally cast, which can be used as mud supply for solid-liquid separation equipment. A GNSB 4×3-11J replenishment pump is used for on-site replenishment of mud. A set of mud tanks is used to install solid control equipment, storage mud, and the like.

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With the rapid development of oil and gas exploration and production technology, the traditional mud recovery system has been gradually replaced by an automated, systematic, closed-loop mud recovery system. Cutting dryers are increasingly being used with solids control systems in rigs to meet critical environmental requirements. Cutting dryers can meet environmental requirements, recover and recycle more materials for reuse.

Among all GN products, one of them is a star product, a cutting dryer. It exhibits excellent performance in both the solids control and waste management pipelines. There are two types of cutting dryers, fixed speed and VFD. GN can manufacture them according to the requirements of different customers, saving customers money. The sieve bowl has a maximum diameter of 930 mm. You can choose from three different types of screens, 250 micron, 350 micron and 500 micron. The processing capacity is 30 to 50 tons per hour. Tungsten carbide protects the threads on the rotor from abrasive solids, ensuring a longer service life. The special design of the high-pressure air knife can automatically and easily clean the net, avoiding the blindness of the mud and water-based mud to the screen. A flushing system with specially designed nozzles around the main body of the cutting dryer prevents the liquid discharge passage from being blocked by deposits. The lubrication system is electrically interlocked with the main motor starter to prevent the machine from operating with low or no oil pressure in the gearbox. The VFD control panel can facilitate soft start, and the fingertip control of the VFD system can change the speed of the motor, so that the G force can be changed to the working state. The VFD system is manufactured by ABB or SIEMENS and is explosive. This is a brief introduction to the GN cutting dryer.

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