During the drilling process, the density of drilling fluid will be reduced and increase the viscosity after being invaded by natural gas or air. The decrease of drilling fluid density leads to the decrease of hydrostatic column pressure, which may lead to blowout, well collapse and other malignant accidents. Therefore, the gas invasion drilling fluid is very dangerous, and measures must be taken to deal with it correctly.

After drilling to the natural gas reservoir, the gas probably invade the drilling fluid, and we are sure the air will invade the drilling fluid during the working process of shale shaker, cyclone and mud agitator. The density of drilling fluid decreases obviously after gas invasion, but the influence on the hydrostatic column pressure in the well is much smaller than people think. The reason is that the invading gas is compressible and the density of drilling fluid will increases gradually with the depth of the well. In these two case, there are 2 different pressure gas. So It is dangerous to make a decision to use weighting method to make up for the density reduction only based on the reduction of drilling fluid density that has been invaded by gas, which may lead to the excessive density of drilling fluid , fracturing the formation and polluting the production formation. It will reduce the ROP, cause leakage and lead to the decrease of liquid level in the well, and then blowout.

In order to restore the density of drilling fluid, the most effective means is to use degasser. GN solids control can provide two degasser. The normal poorboy degasser and vacuum degasser. First kind is installed before shaker. Received the drilling mud from well, and vacuum degasser installed between mud cleaner. They utilized different principle, first kind through increase touch area when mud drop on the bottom of tank, brake the bubble involved in mud and move out gas. The vacuum degasser through generate a negative pressure space to make the gas out of mud. Both kind degasser will be need in one full mud system. If you have demand, welcome to contact us.

As we all know drilling mud is one of the most important middle material in the drilling program. As usually ,The solid control system refers to the degasser, shale shaker, desander, desilter, micro desilter, desanding and cleaning device, desilting cleaner, centrifuge and mud tank. That is a whole set of system according to the requirements of solid control. The selection of solid control system is mainly based on the following principles
1 ,Type and size of particles to be removed or suppressed
2,Cost of drilling fluid
3, Liquid solid cost ratio of drilling fluid
4. The quality of drilling fluid that needs to be maintained during drilling is poor, and environmental factors are taught
5, freight and other miscellaneous expenses;
6 ,density of drilling fluid used;
7, mechanical ROP, solid removal rate and circulation rate.

Select the suitable solids control equipment will help to reduce the drilling cost and improve working efficiency.
There are seven basic systems for solid phase control. The first system is the most basic, which is suitable for non weighted drilling fluid. The system largely rely on desander and desilter. During fast drilling, the desilter should be started continuously. It should be noted that if we can concentrate the drill and make it more concentrated than the diluent, we can use “low-density drilling fluid” for the desilter. The second system added Decanter centrifuge based on the first solids control system. Decanter centrifuge are used to remove out the tiny particle. It can clean mud and also reduce mud gravity. The 2 system are used in most drilling project. However , in some special project, the system will require several units hydrocyclone and Decanter centrifuge to teat expensive drilling mud to recycle the mud as much as possible.
However, shale shaker, degasser, desander, desilter, decanter centrifuge are the basic solids control equipment. GN can provide all these equipment and customized produce the system according to client requirement. If you have demanded, welcome to contact us.

In solids control project, the solids content and particle size both are the most important data for user to select suitable separation equipment. And the include particle will also effective the drilling efficiency. Different working condition will generate the different size particle. Today we will introduce the different situation of particle generation.

The range of particle sizes taken into the mud stream at the bit will depend mainly on:
Formation hardness Bit type;Chip hold down; and Effectiveness of the hydraulic hole cleaning action. Even if adequate hydraulics are being used and chip hold down or differential pressures normal, in hard formations fine chips will usually be generated. Most of the particles are finer than 22 microns. Another reason for fine chips is the bit type..a diamond bit will generate smaller chips than a rock bit in hard formations. Use of a water base mud will result in smaller chips than oil mud because of hydration and dispersion effects of the aqueous system. Use of a water base mud for drilling a soft shale formation will ordinarily result in very fine cuttings. With an oil mud and a cone bit, most of the cuttings are larger than 30 microns. Use of a PDC bit will produce cuttings which are typically much larger.The particle size distribution is also affected by mechanical degradation. As the particles are circulated up by the mud return system, they are mashed and ground. The corners are broken off, so that continually smaller and smaller particles are being generated.Borehole stability is a factor affecting the mechanical degradation of formation solids brought to the surface by the mud system. If the hole is enlarged by erosion or sloughing.cuttings cannot be lifted from the hole efficiently. Low annular velocity in the enlarged sections of hole will cause cuttings to fall back and be ground to a finer size before reaching the surface.

In actual project, there are many reason generate vary size particle. The accumulation of solids will reduce mud property. Select the suitable solids control equipment to remove out the solids is very important to keep mud property.

Centrifuge has widely application on different industries, such as chemical industry, energy ,environment, beverage. All centrifuge utilized the centrifuge force generated under high rotated speed. Whatever decanter centrifuge, disc centrifuge or tube centrifuge. Today, we will classify the decanter centrifuge through the separation purpose. In generally, there are totally 3 types separation , dewatering, clarification, and separation. Dewatering is to remove out the liquid phase in the solid phase, and clarification is to remove the solid phase in the liquid phase. Concentration is to make solids in the solution increases.

Dewatering is to remove out liquid from solid as much as possible. As usually, user want to get the discharged solids much dryer much better. To reach this target, the sludge need to stay more longer time inside centrifuge bowl, and solids content of discharged liquid is high relatively speaking. The cone angel was designed smaller to speed liquid discharge ,and make solid phase stay longer time in side centrifuge. Totally opposite with dewatering centrifuge ,clarifying centrifuge require to bigger cone angel as much as possible. Big cone angel will increase the length of liquid processing section, which can make the liquid stay longer inside centrifuge. User usually can get the clean liquid and wet solids. Except the above both types , separation centrifuge make it balance for discharge solids and liquid. Cone angel is in the middle between dewatering and clarify.
The cone angel of centrifuge decided the application of decanter. So when we select centrifugal model ,we need to clear what purpose we want, what treating capacity you need, and also the solids content. The centrifuge capacity is depend on the solids content of material. High content will reduce capacity. Except this, we also need to pay attention to bowl material. As usually ,centrifuge use the high strength stainless steel such as SSR 205，316L. When process slurry with chloridion , make sure the chloridion content is below the Limit, otherwise it will corrosive steel ,and damage it.

Last week we shipped out one dewatering system to Canada for lake sludge dewatering. This is the biggest dewatering system we provided to America market. As we all know Canada have strictly mange to environment, their government invest money on the pollution control especially on the water source protection.

This dewatering system was used to treat the sludge dredged from Quebec lake. Remove out the solids and clench the water, and then discharge water back lake. It is a huge system, actually our equipment is just partial of the whole project, and in charges of the mechanical separation. After our system, it also equipped other machine for the water purification. What we provide is shale shaker, desander, desilter , Decanter centrifuge, screw conveyor and also mud tank. The sludge transfer into shale shaker and desander for primary separation to remove out the big size particle. After that , the discharged liquid need to feed into Decanter centrifuge to separate out particle smaller than 60um. In this project, we built 2 unit GNLW764 Decanter centrifuge, which is the biggest model of GN. The designed treating capacity is 140 cube meter per hour, and actual capacity is about 120 cube meter. This 764 model was especially designed for waste water treatment project to meet client requirement to big capacity.

Client has high request to automation, and reduce the labor working as much as possible. Every separation equipment has a screw conveyor to catch the discharged solids , and transfer it to truck to transport out. The operator finish all the work through the central control box.

GN has been in river dredging project for many years, we have provide many sets system to China and abroad. In north America market ,GN built 15 sets dewatering system. Our competitive price, technical support and high customized solution made our equipment more and more famous in America. If you have similar project , welcome to contact us.

Drilling fluid is a circulating fluid used in drilling process. It is a mixture of liquid, solid and chemical. For a long time in the past, drilling fluid was commonly called “mud” at home and abroad, which is not accurate. Solid particles in drilling fluid can be divided into harmful solid and useful solid.Drill cuttings are the most harmful solid phase in drilling fluid, which will affect the physical properties in the whole drilling process, and increase the density, viscosity, dynamic shear force, water loss, mud cake, abrasiveness, viscosity and flow resistance of drilling fluid. In the process of drilling, drill cuttings will also damage the oil and gas reservoir, reduce the ROP, increase the rotary table torque, cause the rig sticking, and also downhole complex situations, such as lost circulation and blowout. At the same time, the drilling cuttings will cause serious wear to the circulating system. In order to economically and effectively eliminate harmful solid phase from drilling fluid. It is necessary to deeply understand the composition characteristics of drilling fluid.

The main functions of drilling fluid is cleaning the well bottom and carrying drill cuttings; Cooling and lubricating the drill bit and drill string; Form mud cake to protect well wall; Control and balance pressure; Suspended drilling cuttings; Provide formation data; Protect oil and gas reservoirs from damage.

Sometimes the clean water can be used as drilling fluid in well drilling. But for deep well and complex drilling, water is not enough. There need to add other material such as barite, clay, salt, oil to increase the mud density to reach the using. In actual drilling project, drilling mud is more complex than we are thinking. In different drilling stage or different geologic situation, it will also need to mix kinds chemical material to keep the mud property. Drilling slurry is the most middle material with lots function, which directly influence the drill efficiency and safety. Choose the good drilling mud and solids control equipment to make sure the drilling work.

Drilling fluid cost is an important part of the cost of the whole drilling project, which is usually expressed by the cost per unit footage, which involves the cost of some complex accidents (and can be avoided) encountered in the process of drilling and merging, such as sticking.
In many cases, the cost of drilling fluid also includes solid control, waste management and waste disposal. Therefore, it is equally important to reduce the cost drilling .Special maintenance and equipment are required to control the solid content of well fluid . If the waste liquid and cobalt cuttings produced by cobalt well fluid cannot be directly discharged into the surrounding environment, but must be transported away, generally speaking, it will also increase the cost of drilling fluid. Until now, the waste water-based drilling fluid can be directly discharged into the surrounding environment without any treatment. In many areas, government regulations prohibit the use of chromium containing substances, such as chromium lignosulfonate. In many areas, the use of chloride, nitrate and potassium salts in drilling fluid is forcibly limited, or the more common practice is the total conductivity of drilling fluid. Oil based drilling fluid, especially offshore, tends to be more limited than water-based drilling fluid, only oil-based drilling fluid with zero discharge measures (sometimes referred to as closed-loop system) can be used. In the United States, if the toxicity and biodegradability of synthetic based drilling fluid meet the standard requirements and do not produce fluorescence, it can usually be directly discharged into the sea. From this point of view, although the direct cost of synthetic based drilling fluid is generally higher than that of oil-based drilling fluid, its treatment cost is often lower. In this way, the use of synthetic based cobalt drilling fluid can be more economical than oil-based drilling fluid.

Choose the suitable drilling fluid and solids control equipment are the most important things to reduce the cost of drilling.

When drill some shallow well, such as water well,foundation well, which seems do not need drilling fluid. But in petroleum well drilling, the well depth may reach 7000 meters, this geology is more complex, how to guarantee the property of drilling fluid is the most important work for drilling, And drilling cutting is the main reason to influence fluid.

Therefore, the economic impact of drilling cuttings on drilling a well is very subtle. The increase of drilling cuttings content will not immediately lead to drilling disaster. When the bit stops drilling and the torque increases, the drilling staff immediately know it’s time to pull out; The negative impact of the increase in the amount of rock cuttings will not be shown immediately, so reducing the solid content is similar to buying an insurance policy to prevent accidents. It is difficult to ensure that some accidents (such as sticking) will not happen. No drilling engineering advocates sticking or fishing operations. However, even if special drilling rigs are used in a drilling area, sticking and fishing accidents often occur. The negative effect of rock cuttings is real. Understanding this fact and reasonably treating drilling cuttings on the ground will help to reduce drilling costs and raise the drilling efficiency.

Drilling cutting also destroy the pressure balance between outside and inside of the well, because drilling cutting will influence the fluid density, and reduce the fluidity of fluid. We can know that drilling cutting may destroy. Select the suitable solids control equipment is very important to make sure the drilling success. As usually, shale shaker is the first level separation ,desander is second ,desilter is third level. Sometimes we also will add degasser into the system. and also Decanter centrifuge as the last step. However ,Decanter centrifuge for some project is not necessary.
GN Solids control has been in this industry for more than 15 years, if you have these need, we can provide technical support and equipment for your project.

Till now, it is 14 year since GN solids control funded. We grew up from a small manufacture, and For now , we exported our products to 76 countries and served more than 2000 customers from all over the word. Currently , GN is still in the high speed development. This year we built our third factor with 80000 square meters. The new factory is almost double of the to of two using factories. In the third factory ,we will use more advance production line and also management. The long delivery has limited GN development ,after this third factory put into production, We can provide more quick delivery time.

It is not easy for a new brand to get trust from customer. However the stable quality and good support of technology and after salve service, which make us win the reputation from customer. We built long terms cooperation with lots big customer, and they are continue to place order from GN every year. This is a good success for GN Solids Control, and we can not reach it without the support of customer.

GN Solids America as the branch, we main serve the customer from north and south America customer. In 2021，all of us experienced a tough time. The pandemic still has big influence to us to return production , which make us had to delay the delivery time . However thanks for the understanding of our client . All is better now, we are speeding up to delivery the order as soon as possible.
Our colleague of GN Houston has been in holiday from yesterday. This is a wonderfully team, and they get good sales in 2021. The most important, GN this brand is gradually be known by some client , and stable quality is accepted by customer. We are really appreciate to all our customer, thanks for your support and trust. Hope all of you have a wonderful holiday and merry Christmas to everyone.

GN solid control as one of the leader in the solids control industry in the world ,we had served more than 2000 customers from all over the world. And also include the top oil gas companies in the world. Actually, we provided more or less equipment to every top 10 oil gas industry in the world for past 15 years. GN has become one of the most famous brand in the world. OUR equipment get the good feedback from client. Actually African is one of our biggest market and especially Nigeria. last week we shipped 3 oil sludge treatment system to Nigeria in the last end of 2021. This order is from our old client that cooperate with GN for more than 10 years.

Oil sludge treatment system is specially developed by GN for the oil drill cutting treatment . As we all know, in the petroleum well drilling ,which will use large mud to balance pressure of well ,carry the cutting from well and protect the well. These mud is very experience and also high polluted to environment. Recovery these sludge and reuse it is very necessary to save money and protect environment. From this photos we can see this system main include GN vertical cutting dryer and Decanter centrifuge.

Vertical cutting is specially used for oil base sludge. which work principle is similar with the dryer of clothes washer. Utilize the high rotation and generate separation force. The liquid will be separate out from material. The difference is this machine is continuous work, it can keep discharge solids. vertical cutting dryer can recover 95% liquid in the material. After treating by this machine. The discharged solids is dry enough to transport and it can not permeate into soil and reduce the pollution.
After that Decanter centrifuge will treat the liquid again for clarifying ,and then the liquid will back to mud system for drilling again. This is environment friendly and good way to save the cost of drilling, if you have need on these equipment, welcome to contact us.