Month: August 2018

There are usually two options for selecting a solid-liquid separation device.

(1) Plate and frame sludge dewatering machine:

The plate and frame filter press is extruded through the plate frame, so that the water in the sludge is discharged through the filter cloth to achieve the purpose of dehydration. It is mainly composed of concave man filter plate, frame, automatic-pneumatic closed system measuring plate suspension system, filter plate vibration system, air compression device, filter cloth high-pressure flushing device and fuselage side photoelectric protection device. Advantages: low price, good at dehydration of inorganic sludge, low moisture content of mud cake.

Plate and frame sludge dewatering machine

Disadvantages: easy to block, need to use high pressure pump, not suitable for dewatering of oily sludge, it is difficult to achieve continuous automatic operation.

When selecting equipment, you should consider the following aspects:

1 The requirement for the solid content of the mud cake. Compared with other types of dewatering machines, the general plate and frame filter press has the highest solid content rate of up to 35%. If considering the factors of reducing sludge accumulation, the plate and frame filter press should be the preferred solution.

2 frame material.

3 filter plate and filter cloth material. Corrosion resistance is required, and the filter cloth must have a certain tensile strength.

4 How the filter plate moves. The requirements can be fully or semi-automatically completed by hydraulic-pneumatic devices to reduce the labor intensity of the operator.

5 filter cloth oscillating device, so that the filter cake is easy to fall off. Compared with other types of dewatering machines, the biggest disadvantage of plate and frame filter presses is the large footprint. At the same time, due to the intermittent operation of the plate and frame filter press, the efficiency is low, the operating environment is poor, and there is secondary pollution. The domestic large-scale sewage treatment plant has rarely been adopted.

(2) Horizontal screw sedimentation centrifuge:

The horizontal screw sedimentation mud centrifuge is mainly composed of a transfer and a screw conveyor with a hollow shaft. After the sludge is sent into the drum by the hollow shaft, the centrifugal force generated by the high-speed rotation is immediately turned into the hub cavity. The sludge particles have a large specific gravity, and thus the centrifugal force is also large, and the crucible is attached to the inner wall of the rotating hub to form a solid layer; the water density is small, the centrifugal force is also small, and only a liquid layer is generated inside the solid layer. The sludge of the solid layer is transported to the cone end of the transfer under the slow push of the screw conveyor, and is continuously discharged through the outlet around the transfer. The liquid is discharged from the overflow to the transfer, and is collected and discharged to the centrifuge.

Horizontal screw sedimentation centrifuge/Decanter centrifuge

Advantages: Large processing capacity.

Disadvantages: high power consumption, not suitable for solid-liquid separation close to specific gravity.

The most critical component of the horizontal screw settlement drilling fluid centrifuge is the hub. The larger the diameter of the hub, the greater the dewatering capacity. The longer the reloading length, the higher the solid content of the sludge. During use, the revolving speed is an important control parameter, which controls the rotation speed of the rotating hub, so that it can obtain high solid content and reduce energy consumption. It is the key to the operation of the centrifugal dewatering machine. A low speed centrifugal dewatering machine is often used. When selecting the centrifugal dewatering machine, the outer edge of the runner or the screw is extremely easy to wear, and the material has special requirements. The spiral outer edge of the new centrifugal dewatering machine is mostly made up of assembly blocks for replacement.

 

The centrifugal dewatering machine has the disadvantages of high noise, high energy consumption and low processing capacity. There are only a handful of domestic manufacturers that can produce centrifuges suitable for high specific gravity mud separation.

 

The horizontal screw-type sedimentation centrifuge produced by Hebei GN Solid Control Co., Ltd. has a mud cake solid content of more than 30%, and the operation is carried out in a completely enclosed environment. There is no sludge and sewage around the dehydrator. The absence of a foul odor can greatly improve the working environment of the operating personnel and is therefore favored by the industry.

The specific equipment selection should be based on the material to be separated and the separation effect to be achieved.

More question,welcome contact GN solids control

At present, there are many methods for the treatment and disposal of oily sludge in oil fields. The treatment processes are generally concentrated, conditioned, dehydrated, discharged and comprehensively utilized.

In terms of processing technology, the typical sludge treatment processes in China are:

1. Oily sludge – natural evaporation pond;

The process is simple, and the sludge discharged from the innumerable treatment system is directly discharged into the natural evaporation pond for natural evaporation, and the water content in the mud-containing sewage is high, so a large evaporation pond is required. In the colder and more rainy eastern oilfields, the application effect is poor, and the phenomenon that the sewage overflows the evaporation pool often occurs, causing pollution of the surrounding environment.

2. Oily sludge – sludge concentration tank – sludge drying field;

3. oily sludge – concentration – panning and salt removal – flotation degreasing – pressure filtration dehydration;

The oily sludge is concentrated and settled (concentrated by adding medicine), and after reducing the water content, according to the salt content of the original mud, the water is washed in proportion to reduce the salt content. The sludge is separated by flotation, and finally subjected to pressure filtration dehydration to obtain a filter cake.

4. Oily sludge – sludge separation tank – concentration tank – high speed centrifugal separation – dry sludge tank.

The process is to dewater the crude oil, and the various equipments of the sewage treatment system will discharge the oil-containing sewage and the backwash water into the sewage buffer pool for uniform flow into the sludge separation tank. The oil and cement three-phase separation is carried out in the sludge separation tank, and the sewage oil and sewage return system of the branch is reused. The sludge in the branch office contains about 99% water. Then, the sludge pump is used to drive the concentration pump, and the concentrated floc deposit enters the centrifuge for dehydration. The dehydrated 30%~60% water sludge is stored in the dry sludge tank.

The high-specific gravity mud centrifuge produced by Hebei GN Solids control. is a special centrifuge specially used for the separation of floc sediments in the fourth process. At present, the application of multiple sludge separation projects has been carried out in domestic and foreign oil fields.

More question,welcome contact GN solids control

With the development of petroleum industrialization, the pollution problem brought by the drilling process has received more and more attention. At present, there is no recognized effective treatment process suitable for drilling waste liquids in China, mainly because of the wide variety of drilling fluids and working fluid systems, complex compositions and different usage conditions. Techniques that result in waste fluids for a particular type or region of an oil field are not necessarily suitable for use with other types or regions of waste. In addition, compared with the current comprehensive level of sewage treatment in the petroleum industry, the treatment cost of drilling waste liquid and wastewater is relatively high, and the treatment effect is general. Overall, the current drilling wastewater treatment technology is still far from satisfactory.

 

Mainly manifested in:

1, the treatment agent is not high efficiency, can not fully achieve the treatment effect

2, the treatment method is single, the depth of pollutant removal is limited, and the treatment effect on some pollutants is not good

3. The continuous processing device is not targeted, and the processing cost is high, resulting in reduced efficiency.

According to the above analysis, no matter the above-mentioned treatment technology has a certain range of application, the method selection should be based on a certain method, according to the nature of the waste drilling fluid produced by each oil field and the geography, climate, and location of each oil field. The most reasonable optimization of the characteristics of the environment, and in order to more effectively control the problem of drilling wastewater pollution, it is recommended that future research work should not only strengthen the source and process control, but also develop new technologies. Specifically, there are the following aspects:

1. Promote clean production, cure the symptoms and improve the efficiency
2. Develop low-cost, high-performance environmentally friendly drilling fluids to help promote technology
3. Research and development of new drilling fluid water treatment agent and unified technology to improve overall processing technology
4. Develop a new technology for harmless comprehensive utilization and make environmentally friendly technologies
5. Strengthen management control, strengthen process supervision, and control from the source

The clean production drilling fluid purification equipment developed by Hebei GN Solids Control Co., Ltd. can effectively reduce the generation of drilling waste, reduce the amount of waste liquid generated by 30~50%, and effectively reduce the cost of harmless treatment. The reduction in the degree of environmental pollutants.

More question,welcome contact GN solids control