As the country’s requirements for environmental protection are increasing, the construction waste generated during the vigorous development of urban and rural areas, especially the treatment of shield dregs, has become a problem faced by urban managers. How to carry out efficient shield dregs treatment and the effective protection of the environment has become a problem that needs to be solved urgently in urban development.
KOSUN has very rich experience in infrastructure construction, mud water treatment and other industries. As a professional shield muck treatment equipment manufacturer, it has developed a safe, environmentally friendly, efficient and cost-effective shield muck treatment price. Shield muck treatment equipment, which uses a belt conveyor system to transport the newly excavated muck from the depths of the tunnel to the hopper of the ground muck separation system. The final separated coarse sand and fine sand are lifted through the belt. The machine is transported to the truck for transportation, dewatering, separating and drying the muck in stages, which effectively solves the problem of muck transportation, realizes the reuse of inorganic raw materials and water resources, realizes the recycling and reuse of the muck, and protects the environment at the same time.
At present, the shield muck treatment equipmentproduced by KOSUN has been put into use in many places across the country, especially in the Guangzhou shield muck treatment market, which has obtained good feedback. KOSUN can customize suitable and economical shield muck treatment equipment for customers based on customer needs and combined with the actual situation on the site. Customers are welcome to consult.
Oil-based Mud zero discharge mainly for directional wells and ultra-deep wells. Directional wells and ultra-deep wells require an oil-based mud system to prepare the mud. The oil-based mud contains expensive diesel or white oil, and the oil-based drilling solids control system treats the oil-based mud. If the drilling cuttings still contain oily mud, if the mud is not treated on the ground, the mud will be wasted and the drilling cost will increase.
Water-based Mud zero discharge mainly for shallow wells. Water-based mud is mainly prepared by adding chemicals or industrial salt to the soil. The solids control system uses water-based mud drilling system. The drilling waste generated by the water-based mud drilling system also contains effective mud. Disposal will also cause waste of mud, which needs to be recycled without mud disposal.
Mud zero discharge is the key to drilling waste treatment. It is the result of improved drilling technology, replacing traditional mud pools, reducing drilling environmental pollution and improving the necessary methods for environmental protection. The current Mud zero discharge includes water-based Mud zero discharge and oil-based Mud zero discharge. The two methods of Mud zero discharge are determined according to the mud treatment system adopted in the drilling.
Mud (drilling fluid), which is used to lubricate the drill bit, cement the well wall and cool down during the drilling process. In the whole drilling process, mud is of great significance to reduce drilling accidents and improve drilling efficiency. Generally, water-based mud systems and oil-based mud systems are mainly used in drilling sites.
However, the Mud zero discharge through the secondary filtration separation and recovery of drilling waste, which directly saves a lot of drilling mud, especially oil-based mud. Therefore, Mud zero discharge is the key to drilling solids control and drilling waste disposal.
Under the new pattern of circular economy, how to dispose of construction waste(Construction Waste treatment) with an annual increase of billions of tons has become one of the problems that the industry urgently needs to solve. In recent years, with the acceleration of urban construction and renovation, the problems of construction waste pollution and garbage siege have become increasingly prominent. In terms of inventory, the current increase in domestic construction waste reaches about 3.5 billion tons per year.
According to the source of construction waste, it is mainly divided into land excavation waste, road excavation waste, old building demolition waste, construction waste and building material waste. The demolition phase of buildings and the construction phase of new buildings are the key points for the control of construction waste. The demolition of old buildings and new construction accounted for 58% and 36%.
At present, our country’s treatment of construction waste is still in the relatively extensive landfill and stacking stage. In fact, construction waste is a renewable resource. After scientific recycling, separation, screening, and smelting, it can completely turn waste into treasure to restore its original performance, and reuse it as a renewable raw material. However, transforming construction waste into qualified, high-quality aggregates that can replace natural sand and gravel, and then into market-recognized products, is the biggest challenge facing companies.
Drilling engineering is a field operation engineering in oil and gas exploration and development activities. During drilling production, “waste slurry, waste water, waste oil”, rock cuttings, production and domestic garbage and other wastes inevitably cause pollution and harm to the surrounding environment. Therefore, vigorously promote the “green drilling” mud circulation system, actively realize sustainable development, establish green environmental protection awareness, control pollution from the source, and realize green environmental protection for oil and gas exploration and development.
“Green drilling” refers to the drilling process that focuses on pollution prevention, minimizes the consumption of raw materials and energy, reduces production costs, and reduces and prevents damage to the ecological environment during the drilling process.
In order to bring the broken cuttings of the bottom hole drill bit to the ground in time to continue drilling, and to cool the drill bit to protect the well wall and prevent the occurrence of drilling accidents such as well collapse and lost circulation, the rotary drilling rig is equipped with a mud circulation system. The mud circulation system includes drilling pumps, ground manifolds, mud tanks, mud purification equipment, etc. The ground manifolds include high-pressure manifolds, risers, and hoses, and mud purification equipment includes drilling fluid shakers, de-sanders, and desilters , Centrifuges, etc.
Waste drilling mud is one of the main pollution sources in the petroleum and natural gas industry. The Oilfield Drilling Waste Mud Treatment Process is to treat the waste drilling mud (drill cuttings) immediately while drilling to meet the requirements of “mud zero discharge” and reduce environmental pollution. This technology is to dilute, flocculate and separate the waste mud into rock debris, mud cake and water, and process the solids in the mud through water washing, flocculation separation and chemical reaction to make the rock debris and mud cake meet the discharge standard.
The Oilfield Drilling Waste Mud Treatment main equipment includes: shale shaker, drill cuttings dryer, drilling fluid centrifuge, screw conveyor, screw pump, etc. KOSUN’s zero discharge mud system can effectively control the water content of drilling cuttings (6%-10%) in the drilling mud, stabilize the liquid phase performance, and achieve the purpose of mud zero discharge.
There are many kinds of waste mud treatment processes in oilfield drilling. Each treatment plan needs to be determined according to the drilling site and drilling construction conditions. It must not only achieve the treatment effect, but also meet the national environmental protection requirements, and strive to achieve harmless treatment. It plays an active role in improving and protecting the environment, soil and groundwater.
The Mud Zero Discharge System developed by KOSUN mainly includes shale shaker, centrifuges, cuttings dryers, and screw conveyors. After processing, it can reach an oil content about 2-5%, which is in line with national and industry standards.
After dewatering centrifuge separation and multifunctional purification unit, the harmful part of the mud is discharged with the solid phase. The liquid phase can be used to prepare the mud, discharge as wastewater or irrigate, and the solid part is solidified and then landfilled.
On-site centralized processing while drilling, using physical centrifugal separation technology to recover most of the base oil on-site, reducing the oil content and total amount of waste (the solid phase oil content of the spin dryer is 2%-12%, and the solid phase oil content of the centrifuge is about 13%, the treated solid phase is transported to the centralized treatment station for further treatment, and the liquid phase is returned to the circulation system for use. The advantage of on-site centrifugal deoiling while drilling is that it reduces the total amount of waste at the source, recovers reusable oil-based mud, and the treated waste is easy to store and transport, which greatly reduces the time and energy consumption of subsequent processing.
Solid-liquid separation is an important part of thedrilling waste treatmentprocess. The smaller the proportion of the water content in the waste, the smaller the volume of the remaining solids, and the smaller the required treatment cost, which can effectively control the treatment cost and reflect economic benefits. In recent years, domestically developed orifice plate filter presses, filter belt dewatering conveyors, horizontal screw centrifuges and other dewatering devices have promoted the improvement of drilling waste treatment technology.
This kind of treatment route is to let the sewage pond that collects wastes settle naturally first , and perform conventional sewage treatment on the free water produced after natural settlement; at the same time, add flocculants and coagulants to the sludge part for chemical destabilization treatment, and then pass it through dewatering devices such as centrifuges, filter belt dehydrators, orifice plate filter presses further separate solids and liquids, and finally solidify and treat the separated solids and moisture respectively, thereby completing the elimination of drilling and completion waste fluids. Harmful treatment. In this scheme, since the dehydration device is still in the trial stage, the degree of automation is not high and the efficiency is low.
Therefore, to improve efficiency, it is necessary to reduce from the source, and to simultaneously treat waste during the drilling process. After fully drawing on some advanced foreign experience, combined with the on-site situation of the drilling site in the country. KOSUN, a manufacturer of oil drilling equipment and solids control equipment, has formulated a comprehensivedrilling waste treatment solution for customers. The program starts from the source through four major steps of solids control equipment-dehydration/water treatment/water recycling/filtering-mud recovery-solidification/biodegradation/thermal analysis/drill cuttings reinjection.
Drilling waste mud is one of the main pollution sources in the oil and gas industry, and its waste treatment is currently a major problem that plagues oil fields. The oilfield drilling waste mud treatment process is to treat waste drilling mud (drill cuttings) immediately while drilling, meeting the requirement of “mud not landing”, reducing land use and environmental pollution.
Oilfield drilling waste mud treatment process is to change “end treatment” to “full process control”. The waste mud is diluted-flocculated-separated into three parts: rock cuttings, mud cake and water, and the solids in the mud are separated by washing and flocculation. With chemical reaction treatment, the cuttings and mud cakes can reach the discharge standard. After the harmful substances and chloride ions in the mud are separated into the water, they are then dehydrated by vacuum adsorption or extrusion to make mud cakes. At the same time, the mud cakes are separated by centrifugation. The wastewater is concentrated by air flotation sedimentation, filtration system, and reverse osmosis system. After treatment, the up-to-standard wastewater can be reused for drilling recycling.
The main equipment of oilfield drilling waste mud treatment process includes: drying shaker, drill cuttings dryer, drilling fluid centrifuge, screw conveyor, screw pump, etc. The KOSUN mud non-grounding system can effectively control the drilling cuttings in the drilling mud Water content (6%-10%), stable liquid phase performance, to achieve the purpose of mud drying treatment without falling to the ground.
There are many kinds of oilfield drilling waste mud treatment process in oilfield drilling. Each treatment plan needs to be determined according to the drilling site and drilling construction conditions. It must not only achieve the treatment effect, but also meet the national environmental protection requirements, and strive to achieve harmless treatment. It plays an active role in improving and protecting the environment, soil and groundwater.
The decanter centrifuge uses the principle of centrifugal sedimentation to separate the drilling suspension. The suspension enters the drum from the feed pipe through the liquid outlet hole in the screw pusher, and the solid particles are pushed to the inner wall of the drum under the action of centrifugal force and pass through the screw. The blades on the pusher are pushed to the slag discharge port at the small end of the rotating drum, and the liquid phase overflows through the overflow hole at the big end of the rotating drum. Such continuous circulation, in order to achieve the purpose of continuous separation. Sedimentation centrifuges belong to the category of horizontal spiral centrifuges, and the full name is horizontal spiral sedimentation centrifuges. crown
Dewatering principle of the decanter centrifuge: The decanter centrifuge uses the density difference between the solid and liquid phases, and under the action of centrifugal force, accelerates the sedimentation speed of the solid phase particles to achieve solid-liquid separation. The specific separation process is that the sludge and the flocculant liquid are sent into the mixing chamber in the drum through the inlet pipe, where the mixing and flocculation are carried out (if the sludge pump is dosing before the pump or the pipe is behind the pump, the flocculation reaction has been advanced) Due to the high-speed rotation and frictional resistance of the rotor (screw and drum), the sludge is accelerated inside the rotor and forms a cylindrical liquid ring layer (liquid ring area). Under the action of centrifugal force, the solid particles with larger specific gravity settle to the A mud layer (solid ring layer) is formed on the inner wall of the drum, and then the relative speed difference between the spiral and the drum is used to push the solid phase to the cone end of the drum. After pushing out the liquid surface (shore area or drying area), the mud can be dehydrated and dried. It is discharged to the slag discharge port, and the supernatant is discharged from the big end of the drum to achieve solid-liquid separation.
The use of new technology for Zero Discharge Drilling Waste Management Equipment can effectively solve the problems of complex composition, high chroma, high COD, high toxicity, difficult treatment, large area, and risk of landfilling in deep mud drilling.
First, collect drilling waste mud and cuttings while drilling on site, replacing the traditional waste collection method of excavating mud pits;
Second, the separated waste mud (liquid phase) adopts the technical idea of “removing harmful and retaining useful”, and uses “physical separation” as the main process to achieve mud regeneration treatment and reuse it on site for drilling ；
Third, the separated rock cuttings (solid phase) and other wastes are added to the targeted development of harmless and resource treatment agents to produce resource-based products on site and achieve harmlessness; its resource-based products Not only meets the requirements of the corresponding environmental protection technical indicators, but also meets the technical indicators of the resource products used as building materials, and the made building materials such as non-burning bricks and non-burning stones for paving roads.
KOSUN provide the full line of Zero Discharge Drilling Waste Management Equipment for drilling, operators is able to run the closed loop mud circulation system to reduce the cost for drilling waste handling. KOSUN Zero Discharge Drilling Waste Management Equipment is a packages system for the drilling rig to dry the OBM, SBM or WBM drilling cuttings and recycling the drilling fluids after cleaning by the decanter centrifuge.