May 31

Drilling fluid barite effect and recovery method

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Introduction to barite

Barite, scientific name barium sulfate (BaSO4). China’s barite is rich in resources. It is distributed in 26 provinces, municipalities, and autonomous regions nationwide. It is mainly concentrated in the south. Guizhou Province accounts for one-third of China’s total reserves. Hunan and Guangxi rank the second and third in the country, respectively. The stone not only has a large reserve but also has a high grade of BaSO4>92.8%. The bonanza reserves accounted for 99.4% of the country’s total high-grade ore reserves, and large- and medium-sized ore reserves accounted for 88.4% of the country’s total. By the end of 1995, China had proven reserves of 460 million tons of barite resources.


In addition, barite is hardly soluble in water and acid, non-toxic, non-magnetic, and can absorb X-rays and gamma rays.

The main use of barite in the drilling industry:

1,The weighting agent used for solid control system mud to balance formation pressure and prevent blowout;

2, in the oil-based drilling fluid, adsorbed on the wall of the well, play a role in lubrication and anti-card;

3, plug the formation gap, shielding temporary gambling.

PLC Touch screen VFD centrifuge

Barite quality standards

Barite products have different specifications and quality requirements depending on their use.

Quality requirements for barite powder for oil drilling:

Density ≥ 4.2g/cm3

Barite powder size distribution

+200 mesh “3%

-200 mesh, 97%

– 2000 mesh “10%

Principles and Goals of Barite Recovery System

Size distribution of barite powder, bentonite and drill cuttings for drilling fluid weighting

Solid particle size distribution:

According to the standards set by the American Petroleum Institute (API), the solid phases in drilling fluids can be divided into three categories according to their size:

Sand (API sand) particle size greater than 74μm

Mud particle size between 2 and 73 μm

Clay particle size less than 2μm

Under normal circumstances, the particle size distribution of the solid phase in non-heavy drilling fluids is as follows:

Category Particle size range (μm) Corresponding mesh mass fraction (%)

Sand >2000 >10 0.8~2

250~2000 60~10 0.4~8.7

74~250 200~60 2.5~15.2

Mud 44~74 355~200 11~19.8

2~44 / 56~70

Clay <2 / 5.5~6.5

Solid-phase particle size distribution in drilling fluids (determined using typical disperse water-based drilling fluids)

The proportion of coarse sand particles with a diameter of more than 2000 μm and rubber particles with a diameter of less than 2 μm is not large in the drilling fluid. Among them, more than 74 μm (200 mesh screen cloth) accounted for 3.7-25.9% and less than 2 μm accounted for 5.5-6.5%.

More question,welcome contact GN Solids Control

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May 25

GN solid control unique screen characteristics

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GN solid control is an internationally renowned manufacturer of solid control equipment and vibration screens. Well-known Chinese and foreign GN solid control trademarks have been well received by our customers. Our company’s products have been well applied in most of the world’s oil and gas drilling sites. Many world-class oil companies have come here to visit our factory. Our company’s headquarters is near Beijing, China. It is located in Daechang Chaobaihe High-tech Industrial Zone of Petroleum Equipment in Hebei Province and has established branches in the United States and Russia. We are the sole manufacturer of vibrating mesh screens that passed the US API RP13C test until 2018. Our vibrating screens can be used in GN shakers and other mainstream brands of shakers at home and abroad.

GN solid control vibration screen product technical requirements:

1,Structure requirements: The screen within API60 adopts a 2-layer mesh structure, and the screen above API 60 adopts the 3-layer mesh structure.

2,Appearance requirements: no damage to the mesh surface, smooth surface, no broken wire, no wire drawing, no obvious color difference, clean, tidy, no obvious protrusion, no break, except for process requirements, no blocking hole, no leakage , Tightening is good, no effect of the use of fold phenomenon smooth border, no silk, no burr, no front edge, glue stick strong.

Note: The wavy network must be polished on both sides, the overall smooth, groove grinding, no leakage plug hole, no leakage on the back, the network surface pressure resistance, hand pressure without distortion, handle solid plastic.

3, welding requirements: no seam welding seam direction, no trachoma. There is no leakage in the direction of the transverse seam. Frame, no deformation of the board, no penetration, four corners need to be polished, the edges of the edges do not hurt the hand.

4, size requirements: size error range ± 0.5 ~ 1mm, mesh number is accurate, can meet the corresponding shaker installation and tension.

5,Packaging requirements 1: The carton is packed in a carton (the single screen can be packaged with plastic film). The two sides of the carton need to be affixed to the product label.

Note: When two screens are packaged in the same carton, they need to be placed adjacent to each other, with a soft material in between. A carton allows a maximum of 2 screens.

Comparison instructions:

1) ASTM refers to the American Materials and Testing Association, ASTM E11:01 mesh number is also ISO 3310-1:2000 mesh number, and the ASTM mesh number corresponds to the separation particle size refers to the single-layer screen mesh according to the ASTM standard wire diameter woven screen. Cloth size corresponding to the size of the separation. The mesh number corresponding to the screen usually refers to the mesh number of the screen mesh. However, the screen is usually composed of 2 or 3 layers. The mesh size corresponding to the mesh does not equal to the mesh size of the screen after compounding.

2) API refers to the American Petroleum Institute. The “Screen API Number” is a code according to API RP13C or ISO13501 standard. The separation particle size corresponds to the interval after the composite three-layer screen is separated to obtain the separation particle size. When ordering screens, we usually require customers to provide the required API code, or want to achieve a separate particle size, which can more accurately determine the ratio of the screen.

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May 19

General method for horizontal cross mud cleaning

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Horizontally oriented traversing technology is particularly advantageous for rivers and lakes, railway tunnels, and large-scale immovable buildings in the process of construction of urban cable and oil and gas pipelines. The hole diameter of the construction is basically to lay pipes. 1.2-1.5 times, there must also be mud in this process to ensure the strong reliability of the pipe wall. 1. The principles of horizontal directional cross-slurry solids purification and several commonly used methods.

compact mud system

Mud cleaning solid control is the abbreviation for controlling the solid content in mud. Solids control technology removes unused sand and other solids from the mud and retains the particles used in the mud. In order to meet the needs of mud characteristics during the crossing process. The harmful substances in it will affect the specific gravity of the mud, lubrication performance, and reduce the effect of fastening the wellbore wall.


Solid-liquid separation of mud is a matter of observing the Stokes law, that is, the mathematical theory of the natural sedimentation of solid small particles in liquids:




Where V – particle sedimentation velocity, cm / s; d – particle diameter, g / cm3

G——gravitational acceleration, 981cm/s2; η——viscosity, cP

ρS – particle density, g/cm3; ρ – liquid density, g/cm3


This law is a digital, scientific and scientific explanation of the principle and timing of solid particles, natural sedimentation, vibrating screens, cyclones, and centrifuges.


At present, both at home and abroad, through this law, constantly following new equipment, innovating products, and having the most primitive natural sedimentation, vibrating screens and vibrating screens have been generated, the acceleration of gravity has been simply increased, and then the hydrocyclone has been invented. The principle of the vortex is a high-density sinking and light floatation to achieve solid-liquid separation. Finally, a decanter settlement centrifuge was invented. The artificially accelerated rotation of the mud increased the acceleration of gravity by a few hundred times, and the customer serviced the natural gravity. The mud is forcibly layered in the centrifuge and then separated.

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May 11

Introduction to Mud Recovery System

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The repeated use of the mud during the excavation process is to simply separate the excavated mud and gravel from the mud base fluid, but not all the solid phase materials are separated. The mud recovery system only separates the drilling fluid. The useless solids in the mud.

The bentonite and other drilling fluid additives added during the slurrying process are also solid, but the added solids are all very small solids with a particle size of several micrometers or submicron, so the slurry recovery system is in the process of processing the slurry. The unit of measurement required for particle size is important. Micrometer-sized units are commonly used in the industry.

The size of the bentonite particles added during the preparation of non-digging drilling fluids are all submicron-sized particles. This is something that we need to keep in mind. It means that bentonite is not easily separated from the slurry during the process of purifying the mud using the mud recovery system. For different formations in different regions, the size range of the soil or grit excavated by drilling is also different. The basic range can be from 1000 μm to sub-micron. Our selection of screens is generally below 120 mesh, because the 120 mesh screen means that he may separate 100 micron and larger particles.

In our actual excavation process, the particle size of the clay is smaller than that of sandy soil, and the size of the cuttings is larger than the former two. The smaller the particles are, the more difficult it is during the mud recovery process. Separation of particles smaller than 20 microns is generally not economical in the trenchless industry, so submicron bentonite or chemical additives will not be separated from conventional mud recovery systems. The objective of the mud recovery system is to separate the mud and gravel in the drilling fluid mud, and then ensure that the mud can be recycled, so as to save costs and protect the environment.

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May 06

Discussion on the Technology of Barite Recovery from GN Solid Barite Recovery Unit

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In recent years, with the increasing number of deep wells and special process wells, the drilling fluid system has become more and more complicated, the use of drilling fluids has become more and more frequent, and more and more heavy materials have been used. This has not only increased drilling fluid costs but also increased the Staff’s labor intensity. The barite recycling plant designed and produced by our company came into being. This device can not only recover the barite, but also remove the low-density and harmful solid phase in the mud.

To explore the application value of this set of barite recovery devices, we must first understand the main role of barite in the drilling industry:

Function 1. Barite is generally used as a weighting agent for drilling mud to control formation pressure balance and prevent blowout during drilling.

Second, in the oil-based drilling fluid drilling project, it can be adsorbed on the well wall to play the role of lubrication and anti-card.

Function 3: Block the gaps in the formation and play the role of shielding temporary plugging.

Since barite is so important in drilling engineering, what are the requirements for barite quality standards?

First, the barite products have different specifications and quality requirements depending on their use.

We mainly understand the quality requirements of barite powder for oil drilling:

  1. 1. the density ≥ 4.2g/cm3
  2. Barite powder particle size distribution: +200 mesh “3%; -200 mesh” 97%; -2000 mesh “10%

Under normal circumstances, the detachable particle size range of the conventional de-sanding device and the drilling fluid desilter will partially overlap with the particle size range of the barite powder. At this time, the role of GNZS594 drilling fluid vibrating screen is the most important. When 200 mesh fine screen is used, more than 74μm cuttings can be removed. This particle size value is just the upper limit of the particle size distribution of the barite powder for drilling fluids. It means that when the 200 mesh screen is used, the vibrating screen removes the solid waste that is the useless solids. At this time, the conventional desilter and de-sanding device have a large overlap of the particle size of the barite, and therefore cannot be used alone. For the same reason, the centrifuge cannot be used in the conventional way. Only the solid phase separated by the centrifuge can be used, and the liquid phase separated by the drilling fluid centrifuge can be excluded. To achieve this use of the centrifuge, it must be added to the centrifuge to achieve additional equipment.

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May 01

GN solid-controlled high-speed centrifuge wastewater separation

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Unlike drilling waste disposal systems, the separation of waste water requires a lower differential speed (pushing speed).

Why can’t the differential speed (pushing speed) be used in wastewater treatment?
1) Firstly, the differential speed (pushing speed) completely mixes the liquid and the solid; the whole mud centrifuge will work like a mixing mixer rather than an effective solid-liquid separation device.
2) Secondly, chemical agents are added to the waste water that is usually separated. High differential speed (pushing speed) will cause part of the drug to be lost in the liquid outlet.
3) In addition, if chemicals are added to the waste water before it enters the centrifuge, it will produce foam in the centrifuge.
Therefore, if your centrifuge has experienced the above problems, you may need to consider lowering the differential speed (pushing speed).

Mud centrifuge
For the GN solid control decanter centrifuges, the main drive motor is converted to stock through a differential drive centrifuge. Auxiliary motors directly drive the auger and differential with its operating speed is fixed.

Therefore, how can the differential speed of the centrifuge be reduced (pushing speed)?
1) First of all, because of the differential speed (pushing speed), the quantitative relationship between the auxiliary motor and the differential, the speed of the transfer can be reduced to reduce the differential speed (pushing speed). As the GN brand PLC intelligently controls the large-volume put-down centrifuges of frequency conversion cabinets, it can directly reduce the speed of stock conversion on the frequency conversion control cabinets. For a fixed speed centrifuge, the centrifuge pulley can be changed to reduce differential speed (pushing speed). It is the normal way that many professional mud service companies take because they are familiar with the operation and maintenance of centrifuges. The cost of fixed speed is lower. For new centrifuge users, PLC intelligent control of variable frequency centrifuges is a better choice.
2) Using PLC intelligently control the frequency conversion centrifuge, the operator can also reduce the speed of the screw pusher and reduce the differential speed (pushing speed) by reducing the speed of the auxiliary motor. The option to reduce the speed of the auxiliary motor is more effective in reducing the differential speed (pushing speed). In this case, the centrifuge can work better in waste water separation when operating at high speed and low differential speed (pushing speed). Performance of Decanter Centrifuge.

More question,please feel free to contact GN Solids Control

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Apr 20

Application of GN Solid-liquid Separation Equipment in Shield Slurry

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The shield method is a fully mechanized construction method in the construction of undercutting methods. It is the advancement of the shield machine in the ground. It supports the surrounding rocks through the shield shell and the segments to prevent the tunnel from collapsing. At the same time, the soil excavation is carried out with a cutting device in front of the excavation face, transported out of the hole through the excavation machine, jacked up at the rear by jacks, and assembled with precast concrete segments to form a mechanized construction method for the tunnel structure.

In the process of shield tunneling, the discharge of sludge treatment standard is a mandatory task for the current urban construction, and it has become a powerful interpretation of the promise of the builders to practice the “beautiful city and beautiful China”. Slurry excavated by slurry shield is transported by the medium of mud, that is, the muck removed by the cutting tool is mixed with the mud conveyed into the excavation chamber of the cutter head and sent to the ground mud treatment by mud pump. In the factory, the separation of sludge and water is achieved in the treatment plant through the mud treatment equipment. The treated residue is absorbed as required, and the fresh water is returned to the mud pool and recycled to the excavation tank in front of the shield.

Although the accuracy of sedimentation control of the slurry shield is much higher than that of other underground construction methods, the shield construction is generally conducted through the sand and gravel and clay composite stratum, and the bentonite and environmentally friendly pulping agent are used to prepare the slurry. However, the traditional mud treatment technology is used. The required muddy water treatment sites and other conditions are difficult to meet the extremely high requirements of the municipal sewage discharge standards, resulting in slurry water shields that have not been widely used in cities. Based on years of solid-liquid separation field use cases, GN Solid Control learns that the international market is an advanced technology related to the separation of mud and water. It proposes and designs and manufactures drilling fluid vibrating screens, de-sanders, drilling fluid desilters, and mud centrifuges. The “four-level” treatment system ensures “zero pollution and compliance discharge” and realizes the construction of a small site factory by virtue of its rich solid-control equipment integration experience and advanced production technology. Therefore, the use of a slurry shield in the city must be both It can ensure that the slag soil removed by the shield can be discharged to the ground to achieve separation, and can also ensure that the clean water is separated from the excess slurry under the premise of “zero pollution and discharge standards”. Really “green construction.”

More question,please contact GN solids control

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Apr 15

Drilling wastewater treatment process and equipment

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With the development of petroleum industrialization, pollution problems brought about by the drilling process are getting more and more attention. At present, there is not yet a well-established effective treatment process that is suitable for drilling waste liquids in China. This is mainly due to the variety of drilling fluids and working liquid systems, their complex composition and their different usage conditions. The techniques that result in the use of effluent for a particular type of field or area of ​​the field are not necessarily suitable for effluents of other types or areas. In addition, compared with the current comprehensive level of wastewater treatment in the oil industry, the disposal costs of drilling waste liquid and wastewater are high, and the treatment effect is general. In general, the current drilling wastewater treatment technology is far from satisfactory.

Mainly in:

1, the treatment agent performance is not high

  1. Single treatment method, limited ability to remove pollutants

3, continuous processing device is not targeted, high processing costs

GN Rapid Mud Tank System

GN Rapid Mud Tank System

Regardless of the above-mentioned kind of processing technology, it has a certain scope of application. Therefore, the selection of the method must be based on the nature of the waste drilling fluid generated by each oil field and the geographical, climate, and environmental characteristics of each oil field for the most reasonable optimization. At the same time, in order to more effectively manage the problem of drilling wastewater pollution, the author believes that future research work should not only strengthen the source and process control, but also develop and comprehensively utilize new technologies. Specifically there are the following aspects:

  1. Pursuing Cleaner Production
  2. Develop low-cost, high-performance environmentally friendly drilling fluids
  3. Development of new drilling fluid treatment agent and unified technology

4, the development of harmless comprehensive utilization of new technologies

  1. Strengthen management control and strengthen process supervision

The clean production drilling fluid purification equipment developed by GN Solids control. can effectively reduce the generation of drilling waste, reduce the generation of waste liquid by 30 to 50%, and effectively reduce the cost of harmless treatment. Minimize the generation of pollutants in the environment.

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Mar 25

Drilling fluid centrifuge processing drilling waste treatment process

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During the drilling process, a lot of hazardous waste will be generated, especially in the case of waste mud. This drilling waste will also be generated after the preliminary pretreatment of drilling equipment. The amount of suspended solids and fibers in the liquid is still relatively large. , Crown can use high-speed, ultra-high-speed centrifuges with filter equipment to separate harmful substances in the waste liquid, so as to achieve liquid recycling and pollution-free emission requirements.

The quality of suspended particles in wastewater is different from that of wastewater, and the centrifugal forces encountered during high-speed rotation are also different. The centrifugal force of the large particle mass is large, and it is thrown to the outer circle of the centrifuge rotor of the drilling fluid and discharged downwards along the four walls of the centrifuge; while the small mass is left in the inner ring, it moves upward and the waste water and the suspended particles are separated. . The method is mainly used for removing the emulsified oil, fiber, and drilling fluid deposits in the waste liquid, and is mainly used for waste water pretreatment or intermediate treatment.

Centrifugal separation is a mechanical high-speed rotation separation method. Representatively it uses a drilling fluid centrifuge.

The GN solid control combined with the oil field unit did several experiments on the centrifugal separation treatment of the well team drilling waste liquid with different geological conditions without adding medicine. The experience is that the total rejection rate of the particles in the waste liquid from the liquid depends on such factors as the gradation of the particle size, the influent flow rate, the radial depth of water that the particles move in the equipment, and the residence time of the liquid in the equipment. Without additives and undiluted, 50 sets of tests with different rotation speeds and different residence times have shown significant effects in removing color and solid items. Under the condition of certain residence time, the rotation speed is best at 2500~3200r/min, and the change of water quality is not obvious when it is increased. However, when the rotation speed drops, the effect is reduced to a geometric multiple.

The results show that the treatment effect of drilling wastewater treatment using high-speed centrifuge separation is quite satisfactory.

More detail,welcome to visit GN Solids Control

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Mar 16

Oil Sludge Treatment Expert – GN Solid Control

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Oily sludge refers to a mixture of oil, water, and solids. In order to treat the sludge and recover the oil and water, it is necessary to separate the oil, water and solids. Meanwhile, how to lower cost disposal of solid and recovered oil as much as possible is very important, mud solids control professional to crown centrifuge design, and the oil-water separator to the thermal desorption system is specifically designed for processing oil sands sludge of.

Oily sludge from the source to the sub-words are: 1, crude oil tank cleaning waste sludge produced oil sands, 2, oil sands refinery waste sludge, 3, drilling sludge waste oil sands.


For the different sources of oily sludge, each customer’s treatment is going to be different, GN solid control will configure reasonable treatment equipment according to the specific requirements.


The core processing equipment mainly includes:


1, shale shaker for separating coarse solid particles, and design patents, the excitation strength of up to 8.0 g, and an optional anti-splash Branch sealing system, a thermal spray cleaning system that can effectively remove large particulate material The surface is oily.


Drilling fluid shaker

2, fine solid particles and centrifuge for the separation of oil and water, use of patented technology and top materials and technology, international brands imported bearings and components, improve the stability of the equipment, extend the service life.


  1. The oil-water separator used to separate the two liquid phases can be equipped with various oil-water separation devices, such as ultrasonic and air floatation, to meet the processing requirements of various customers.


4, thermal desorption system, the oil content can be reduced to 0.3% solids, learn from foreign advanced technology, combined with the actual situation of the domestic market, through research and development team of innovative, environmentally friendly design, no secondary pollution, energy consumption Low, safe and reliable.

More detail,welcome to visit GN Solids Control

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