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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) First, the high differential speed (pushing speed) completely mixes the liquid and the solid; the entire slurry centrifuge will work like a mixing mixer instead of 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 reducing 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. The auxiliary motor directly drives the auger and the differential with a fixed operating speed.

 

So, how can you reduce the differential speed of the centrifuge (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). With the large batches of GN solid-PLC PLC intelligent control frequency-changing cabinet settling centrifuges put on the market, the speed of the conversion can be directly reduced on the frequency conversion control cabinet. For fixed speed centrifuges, the centrifuge pulley can be changed to reduce the differential speed (pushing speed). This is the approach taken by many professional mud service companies because they are familiar with the operation and maintenance of centrifuges. The fixed speed is lower cost. For the new centrifuge users, PLC intelligent control of variable frequency centrifuges is a better choice to achieve better separation results.

2) Using PLC intelligently control the frequency conversion centrifuge, the operator can also accurately reduce the speed of the screw ejector, 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 the decanter centrifuge.

More question,welcome contact GN solids control

GN solid control GNLW series mud centrifuges, also known as horizontal spiral unloading sedimentation centrifuges, mud centrifuges, are characteristics of drilling mud, the mud recovery system developed and designed, and solid-liquid separation special solid-control equipment, suitable for oil and gas Drilling mud, sludge dewatering, particle size classification, food protein, starch, kaolin, natural gas desulfurization sludge, waste oil purification and other industries. The removal of fine solids reduces the solids content of the solid-liquid mixture, controls the density and viscosity of the drilling mud, ensures the performance of the drilling fluid, and plays an important role in fast drilling.

During the use of the centrifuge, drum jam may occur, affecting the use of the centrifuge

Mud separation centrifuge analysis

The reason for the blockage is as follows: During the operation of the centrifuge, the flow rate of the slurry pump is too large, or the density of the inhaled mud suddenly increases, the work is not smooth, causing the current to exceed the normal value, causing the auxiliary motor to trip, causing the centrifuge to clog and stop working.

Congestion Cause II: When the centrifuge was stopped, the operation was not carried out in accordance with the operating procedures, the flushing was not performed, or the flushing was not completed. The slurry was already solidified when it was used again, and the inside of the centrifuge could not be rotated, causing the centrifuge to clog.

 

It is advisable to analyze the situation and start the auxiliary motor first. Observe that if the differential and the drum follow the auxiliary motor and it gets faster and faster, it means that the material flushing between the drum and the auger is not thorough or even blocked. Start the main motor in such a way that the centrifuge overcomes the clogging; the material between the drum and the auger should be cleaned.

 

The specific operation method is: remove the shield, use the pipe clamp to clamp the coupling of the auxiliary motor, and apply force in both positive and negative directions. Note: It is not possible to use brute force to prevent the differential from being damaged. Or from the slurry into the water, soak for 12 hours to soften the solidified material, which helps to rotate the motor coupling.

 

Open the collection box for cleaning:

 

Every three days, the collection box should be opened for inspection and cleaning. The wear sleeve, scraper and end scraper on the slag outlet of the main engine are all fragile parts. Be careful when cleaning.

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First, the process

1, water-based drilling mud

1 In the case of normal production of the well team solid control equipment, the cuttings discharged from the well team drilling fluid vibrating screen are sent to the drill cutting dryer for drying, and the solid granular mud generated by the well team shaker is processed. Cuttings are dried.

2Drill cuttings produced by the well team shaker are processed by the dryer drying unit. If they reach the standard, they can be discharged directly. If they are not up to the standard, they can be delivered to the first crucible (primary separation crucible) of the mud processing equipment. Dry the vibrating screen (with drill cuttings automatic curing system) for secondary drying. Cured and dried sludge can be directly discharged if it reaches the standard.

(3) The liquid phase discharged from the dryer and the mixed phase discharged from other solids and control equipment such as the de-sanding device, drilling fluid desilter, and drilling fluid centrifuge are uniformly transported to the second vessel (recovery and conditioning). Dosing modulation mixed stirring treatment.

4 The mud treated by the oil-recovering mash is transferred to the decanter centrifuge on the first rake for solid-liquid separation. The separated liquid phase is reused, and the solid phase enters the sludge conveyor and is sent to the automatic curing system. Drying treatment, treatment after the row.

oil rig mud system

oil rig mud system

Automatic curing system

Spin-drying and solid-liquid separation systems

Social benefits and economic benefits of GN Solid Waste Management System:

Drilling waste mud or cuttings after processing by this device not only enables the drilling fluid taken away from the waste cuttings to be fully recycled, but also saves a large part of resources, and the treated solid objects reach the state’s regulations. The platoon standards, the indicators in the wastewater have reached the national levitation indicators.

After several years of exploration and transformation, the skid-mounted drilling mud produced by our company is not a land-recycling treatment system, and it has been widely used in major domestic oil and gas fields.

At present, the skid-mounted drilling mud harmless treatment device produced by our company has been applied to more than one hundred wells, and it has finally passed the test. It has been unanimously recognized and praised by industry company leaders and experts. The company upholds the concept of integration and innovation, and continues to deepen the study of miniaturized skid-mounted harmless disposal equipment to create clean energy and build a harmonious society and natural environment for development goals. .

More question,welcome contact GN solids control

Hebei GN Petroleum Machinery Manufacturing Co., Ltd. (GN Solid Control) is a well-known drilling mud solids control equipment at home and abroad, drilling waste processing equipment manufacturers:

Oil & Gas Drilling—-Solid Control System & Recycling Equipment

Directional Crossing & CBM – Mud Recovery System

Mine & Industrial & Environmental Protection —- Solid-Liquid Separation Equipment

GN Solids – Centrifugal Separation Equipment Polyphenylene Sulfide Waste Salt Recovery

GN500 GPM mud recycling system for HDD

GN500 GPM mud recycling system for HDD

1, material characteristics

In the production process of PPS, after the polycondensation reaction is completed, the solid phase is washed, the washing liquid is extracted and recovered, the solvent is evaporated, and the crystals are condensed to obtain the by-product inorganic salt sodium chloride.

Ingredients are complex, including sodium chloride, ash, low phenolic materials, solvents, etc.

High solid content, high viscosity, high temperature, 80-100 °C (usually 80, 90 degrees)

After condensation, the material is agglomerated and has a high hardness.

Solid particle size distribution range is wide.

2, the current separation equipment overview and problems

At present, the siphon scraper centrifuge is used to separate coarse-grained materials, and the separation liquid containing fine particles is separated by a LW horizontal decanter centrifuge.

Due to the large viscosity of the material, the material after condensation is agglomerated and has a high hardness, and the filter cloth is easy to be clogged, making it difficult to clean and regenerate. The siphon centrifuge can only be used as a settling centrifuge.

Failed to develop siphon blade centrifuge capabilities.

High energy consumption, large area, high maintenance costs.

Automatic discontinuous work, high labor costs.

The installation is complicated and the installation cost is high.

3, the advantages of GN solid-control centrifuge

GN centrifuge

According to the characteristics of the material, it is recommended to use short drum spiral unloading settling mud centrifuge (dehydration centrifuge) + clarification decanter centrifuge to separate medium and coarse particles and fine particles respectively.

There is no filter in both models, which can avoid the risk of filter clogging.

Low energy consumption, small footprint, low maintenance costs.

Automatic and continuous work, low labor costs.

The installation is simple and the installation cost is low.

GN solid-controlled decanters can continuously feed, dehydrate and discharge sodium chloride in the polyphenylene sulfide desalting section during full-speed operation. The sealing operation provides high processing capacity, stable performance, low energy consumption, and separation efficiency. it is good. It overcomes the shortcomings of existing separation equipment such as intermittent operation and small production capacity, saves investment and simplifies operation.

More question,welcome contact GN solids control

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.

Barite

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

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.

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:

 

V=g(ρS-ρ)d2/18η

 

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.

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.

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.

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