May 19

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.

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May 11

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

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

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

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

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

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

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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Mar 11

GN GN Solid Control Co., Ltd. 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

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 Celsius)

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 the 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

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

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 Control Decanter Centrifuge can continuously feed, dehydrate and unload the sodium chloride in the polyphenylene sulfide desalting section during full-speed operation. It has a sealed operation, large 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 detail,welcome to visit GN Solids Control

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Mar 01

GN Solids Control mainly manufacture and supply equipment for drilling field

As important part in the drilling process of oil drilling or directional through construction, and the control of its performance parameters is focused on rheology and loss. Mud rheology refers to its flow and deformation under the action of external characteristics, of which the main flow. The loss of mud refers to the size of the loss and the quality of the mud cake formed. Therefore, the mud purification system on mud treatment is good or bad for drilling or crossing construction is very important.

GN 1000 HP rig mud system for Turkey

Rheological parameters

 

In the field of construction, the rheology of mud is usually described by plastic flow pattern, and its parameters generally include viscosity, dynamic shear force, static shear force and thixotropy.

 

1, Viscosity and dynamic shear force

1) The viscosity of mud has a great influence on the horizontal directional drilling construction. The main changes are as follows: When the viscosity of mud is high, it has strong carrying capacity and good performance of wall protection, so it is hard to leak. However, the increase of viscosity will increase the flow resistance of mud, increase the power consumption, reduce the impact cutting ability of the drill bit, and affect the drilling speed. At the same time its deteriorating purification capacity, increasing pump resistance, affecting the cleaning time. When the viscosity of mud is low, its carrying capacity and protecting performance are worse. Therefore, different viscosity muds should be prepared according to different situations.

2) The dynamic shear force reflects the ability of the mud to form a space grid structure when flowing in the stratosphere. In horizontal directional drilling construction, dynamic shear ratio (the ratio of dynamic and plastic viscosities) is usually used to indicate the shear thinning strength.

2, Static force and thixotropy

The static shear force of slurry reflects the suspended debris carrying capacity of the slurry. The thixotropy refers to the property that the slurry becomes thinner (lower shear force) after stirring and thickens (increases the shear force) after standing. In horizontal directional drilling construction, the mud is usually required to have good thixotropy.

Loss of parameters

1) Loss of mud is an important property of mud and is closely linked to the wall-making properties of the mud, especially when it passes through unfavorable formations such as looseness, fragmentation and water instability.

2) The fluid loss of mud is mainly related to the type of bentonite, degree of hydration and dispersion, density of mudcake and other factors. Slurry filter loss is small, thin and dense mud cake, is conducive to making the wall hole, the mud filter loss, coarse and loose mud cake is not conducive to protecting the hole wall.

More question about solids control,please contact GN

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