KOSUN

分类： Industry Update

KOSUN exclusively manufacture solids control system,drilling mud solids control equipment,Oilfiled Solids Control,oil and gas drilling waste managemen

  • What hazards to the environment caused by improper sludge disposal?

    (1) Organic matter pollution: Organic pollutants in sludge mainly include benzene, chlorophenol, PCBs, PCDFs and PCDDs. The organic pollutants contained in the sludge are not easily degraded and have toxic residues for a long time. These toxic and harmful substances will cause environmental pollution when they enter the water and soil.
     
    (2) Pathogenic microbial pollution: pathogenic microorganisms and parasite eggs in the sewage will enter the sludge. The pollution ways of pathogens in the sludge to humans or animals include direct contact with the sludge, direct contact with the sludge through the food chain, and water source contaminated by pathogens, and the soil and then the water body polluted by the pathogens.


     
    (3) Heavy metal pollution: During the sewage treatment process, 70%~90% of heavy metal elements will transfer to the sludge by adsorption or precipitation. Some heavy metal elements are mainly derived from industrial wastewater, such as cadmium and chromium. In addition, there are some heavy metals derived from household plumbing, such as copper and zinc.
     
    (4) Other hazards: The secondary pollution of the sludge to the environment also includes the pollution of sludge salt and the pollution of nutrients such as nitrogen and phosphorus. Higher sludge salinity will significantly increase soil conductivity, destroy plant nutrient balance, inhibit plant nutrient uptake, and even cause direct damage to plant roots. After a large amount of sludge rich in nitrogen and phosphorus is applied to the loose soil in the area with large rainfall, when the decomposition rate of the organic matter is faster than the absorption rate of nitrogen and phosphorus by the plant, the nutrients such as nitrogen and phosphorus may run off and enter the surface water body along with water, which will cause eutrophication of the water body and underground water pollution.

  • Features of KOSUN Mud Zero-discharge Treatment

    (1) The purpose of mud zero-discharge:
    With the improvement of environmental requirements, the previous practice of directly landfilling drilling mud has not met environmental requirements, and there is also a lot of waste in chemical agents (such as barite) added in the past drilling process. Therefore, the main purpose of the mud zero-discharge system is to solve the problems of solidifying and transporting the waste drilling fluid to a designated site for processing and recycling useful materials (such as oil in oil-based mud) in the drilling fluid.
     
    (2) Equipment integration of drilling mud zero-discharge:
    The mud zero-discharge system can be divided into two categories according to the types of drilling fluids: water-based mud zero-discharge treatment system and oil-based mud zero-discharge treatment system. The water-based mud zero-discharge equipment includes: high-speed drilling fluid centrifuge (with screw pump), drilling fluid Hi-G dryer, drilling fluid filter press, screw conveyor, dosing unit, mud tank and cuttings box. The oil-based mud zero-discharge equipment includes: high-speed drilling fluid centrifuge (with screw pump), cuttings dryer, dosing device, screw conveyor and cuttings box.
     

    (3) The process flow of drilling mud zero-discharge:
    The water-based mud zero-discharge: the mud to be treated is transported to the drilling fluid Hi-G dryer through the manifold, and the treated mud enters the drilling fluid centrifuge through the screw pump for further processing, and the treated mud enters the mud tank and is stirred and then injected into the mud circulation system. The waste left in the process is transported to the drilling fluid filter press through the screw conveyor for further drying. Finally, the solids coming out of the filter press are sent to the cuttings box and transported out of the site for landfilling or other treatment.
     
    The oil-based mud zero-discharge: the drilling mud to be treated is transported to the cuttings dryer, and the treated drilling mud is sent to the drilling fluid centrifuge for further processing. The liquid mud treated by the drilling fluid centrifuge is re-injected into the mud circulation system. The treated waste is transported to the cuttings box.

  • Drilling Mud Zero-discharge Treatment Process

    Drilling waste mud is one of the primary pollution sources in the oil and gas industry. Due to engineering requirements, oil drilling mud is mixed with oil, water, organic clay and other materials. In the past two years, the drilling crew has been using more and more oil-based mud, water-based mud and composite-based mud, and the increase in cost and environmental pollution problems have become rather serious.
     
    The emergence of the mud zero-discharge treatment system successfully solved the problem that the drilling waste cannot be treated efficiently and environmentally. The main treatment process of the mud zero-discharge treatment system means that the drilling waste returned from the wellhead will be treated harmlessly while drilling before it falls to the ground. The waste mud in the waste mud pit can also be diluted and then classified and utilized. The mud that has been effectively and harmlessly treated can be reused repeatedly, and the frictional resistance is effectively reduced, the accident rate is lowered, and the well quality is improved.


     
    Different from the traditional way, the mud zero-discharge system changes the waste mud from “end treatment” to “full process control”, and the waste mud is diluted- flocculated- separated into three parts: cuttings, mud cake and water. The solid matter in mud is treated through water washing, flocculation separation and chemical reaction, so that the cuttings and mud cake reach the discharge standard, the harmful substances in mud and the chloride ions are precipitated into the water, and then dehydrated by vacuum adsorption or extrusion to form mud cake. At the same time, the centrifugally separated wastewater is concentrated through air flotation sedimentation, filtration system and reverse osmosis system, and the treated wastewater is up to standard and can be recycled for well drilling.
     
    Wastes, such as cuttings, separated from drilling waste can be reused as concrete base after a series of purification, drying and recovery; the mud water generated by cleaning the cuttings is dosed, destabilized, flocculated and separated to form mud cake, which can be blended with clay or shale to burn bricks. Through pretreatment processes such as destabilization, flocculation, air flotation, oxidation and adsorption filtration to remove major pollutants, the separated filtrate water can be used for oilfield reinjection, safe formation reinjection or up-to-standard discharge; after being treated by the sewage treatment system, the sewage can reach the standard of discharge.

  • Why is mud dewatering necessary?

    Mud is generally liquid or viscous before it is dewatered, which makes it difficult to be transported or temporarily stored, and is easy to spread and cause pollution. Therefore, the mud must be dewatered, and the dewatered water can be reused or discharged directly, so that the solid mud can be easily transported, the mud transport volume can be reduced, and the dewatered mud can be recycled, thus achieving the purpose of saving resources.


     
    In addition, the mud contains lots of solid particles such as sand and gravel. If it is discharged into rivers without being treated, it will pollute the rivers, causing sludge sedimentation in the rivers, and affects the living environment of the nearby residents, so the mud dewatering is imperative.

  • Drilling Waste Treatment System Workflow

    The oil-base mud waste treatment system integrates screw conveyor, dryer, collection tank, cuttings box, screw pump, centrifuge and other equipment, suitable for waste mud treatment while drilling or after well completion and waste mud treatment station.
     
    KOSUN cuttings dryer is the core equipment for drilling waste treatment. Its working principle is a vertical scraper discharge filter deoiling centrifuge. It generates 400G centrifugal force at the speed of 900rpm and separates liquid from oil-containing cuttings to reduce the oil content in waste cuttings and achieve the maximum recycling of useful drilling fluids and the minimum environmental pollution. Since its launching on the market in 2011, it has been widely used at home and abroad and can meet such an industry standard as less than 5% OOC.


     
    The entire system consists of three units: cuttings conveying system, cuttings drying system, and cuttings dewatering system.
     
    1. The cuttings collection system includes screw conveyors that collect cuttings from the shale shaker and the mud cleaner.
     
    2. The core equipment of the cuttings treatment system is the VC Series cuttings dryer
     
    3. VFD centrifuge, screw pump and electric control system

  • 4071m! Successful directional crossing of the longest submarine oil product pipeline in mainland China

    According to the Shanghai Securities News, the longest submarine oil product pipeline directionally crossed the Tongming Strait successfully in the mainland China on May 27.
     
    The directional crossing of Tongming Strait is the core project of ZRPC Integration supporting oil product pipeline project (from Zhanjiang to Beihai). The starting point is the Donghai Island of Zhanjiang City, and the end point is Huguang Town on the land on the opposite shore. It has such technical difficulties as complex engineering geology, high environmental protection requirements and limited prefabrication sites, and the total crossing length is 4071m, which becomes the longest submarine oil product pipeline of directional crossing in mainland China.


     
    The directional crossing project in the Tongming Strait is the biggest construction difficulty in the supporting oil product pipeline construction project of ZRPC. In order to ensure the successful crossing in the sea area, the pipeline construction unit – South China Branch, Sinopec Sales Co., Ltd. – held several expert demonstration meetings on the submarine crossing plan and invited domestic top experts to repeatedly conduct site surveys and technical demonstration on key technologies. The project adopts high-precision guiding docking system to ensure the successful docking once, the totally enclosed mud treatment system to ensure the “zero pollution and zero discharge” of waste mud, and the advanced cladding anti-corrosion technology to effectively cope with the complex seawater corrosion environment. The successful directional crossing has not only laid the foundation for the pipeline project completion on schedule, but also accumulated experience for the long-distance submarine crossing construction of the oil product pipeline.

  • Application Status of Mud Treatment Equipment

    In many regions of China, lots of construction piling mud, sand washing mud, drilling mud and mine tailings mud need dewatering treatment. However, the traditional natural sedimentation method is inefficient and the treatment effect is too poor to meet the production needs.
     
    Now, mud is often dewatered by mechanical equipment. The major mud treatment equipment on the market includes centrifuge, filter press and energy-efficient solid-liquid separator. As the requirements for mud treatment are becoming higher and higher, the frame filter is gradually replaced by other mud dewatering equipment due to its open treatment environment that easily causes secondary pollution.
     
    The composition and working principle of energy-efficient solid-liquid separator are as follows:


     
    The main feature of the energy-efficient solid-liquid separator is that the mud concentration and dewatering are completed in the same equipment, and the process mainly consists of three links: sedimentation, extrusion and drying. The three links are respectively completed by intelligent concentration tank, screw extrusion conveyor and centrifugal dryer to achieve the purpose of deep dewatering treatment. Its advantages are: large capacity, low energy consumption, continuous work, unattended operation, small footprint and so on.
     
    At present, the energy-efficient solid-liquid separator has been widely applied in construction mud dewatering, tailings mud dewatering and sand washing mud dewatering, and is fully recognized by customers, such as CREC engineering companies.

  • Application of KOSUN Slurry Treatment Equipment in Pile Foundation Construction

    In the pile foundation project of urban construction, the slurry plays an important role in protecting the well wall, but the treatment of excess slurry has always been a problem that plagues the project construction. The current treatment method is to transport the on-site slurry to the wasteland in the suburbs with a tank truck and let it dry naturally, which is out-dated and causes many problems.
     
    Pile foundation technology is the cutting-edge trenchless technology. As one of the main systems in slurry piling (pile foundation), the slurry treatment system directly affects the construction progress and quality. One of the outstanding problems in the application of this technology is the treatment and reasonable utilization of slurry.


     
    The cast-in-place pile construction is divided into two parts: the hole and the pile. Therefore, the detection of the pile foundation falls into two divisions: the hole quality inspection and the pile quality inspection. The hole forming is the first link in the construction of the cast-in-place pile. Because the hole-forming operation is done underground and underwater, the quality control is rather difficult. Complex geological conditions or errors in construction may cause problems such as hole collapse, hole shrinkage, pile hole deflection and excessive sediment. The pile quality inspection consists of bearing capacity detection and integrity detection. When forming the hole, the rotary drilling requires slurry to lubricate and carry drilling cuttings. The slurry separation system produced by Xi'an KOSUN Machinery Co., Ltd. can complete the solid-liquid separation of slurry in pile foundation construction, which can meet various working conditions. With a small footprint, the system is convenient for transportation and has a good treatment effect.

  • The first successful drilling waste resource utilization of polysulfonate mud in China

    Drilling mud, also known as drilling fluid, plays a very important role in drilling operations and is considered to be the "blood" in oil drilling, but its chemical compositions are complex. Therefore, drilling waste mud is also one of the main pollution sources in the oil and gas industry. The harmless and resourceful treatment of drilling waste mud has become a significant technical problem in the process of oil and gas exploitation, and it is also the only way to achieve clean production and green development in oil and natural gas exploitation.
     
    At the Moxi 009-3-X3 Wellsite of Middle Sichuan Oil and Gas Field, PetroChina Southwest Oil & Gasfield Company, the mud zero-discharge treatment equipment is placed on the side of the rig's solids control equipment. The treated mud is returned to the drilling solids control system for recycling. Through the conveyor system, the cuttings are added with treating agents to make the foundation soil, and the brick making machine is using the foundation soil to produce baking-free bricks.


     
    When introducing the characteristics of “mud zero-discharge and recycling technology”, Deng Hao, deputy chief engineer of CNPC Research Institute of Safety and Environment Technology, said that the main features of this technology are as follows: firstly, collect drilling waste mud and cuttings while drilling on site to replace the traditional waste collection method of excavating mud pits; secondly, for the separated waste mud (liquid), adopt the technical idea of “removing the harmful and retaining the useful” and take “physical separation” as the main process to realize the mud treatment and recycling for drilling on site; thirdly, the wastes, such as the separated cuttings (solids), are added with the developed curing agent to achieve solidification and harmlessness on the spot. At the same time, the technology has also met the requirements of the corresponding resource utilization intensity and other indicators, and the treated wastes are used as foundation soil for paving roads and further made into building materials, such as baking-free bricks and stone slates. This technology has solved the recycling and reduction of waste liquid in oil and gas exploitation process, realized the harmlessness and resource utilization of solid waste, and completely eliminated the hidden danger of drilling pollution.


     
    The successful application of this technology is a breakthrough, and the waste mud resource utilization is the first case in China. The harmless treatment, recycling and resource utilization of drilling waste is the only way to achieve clean production of oil and natural gas, and is also an inevitable choice for realizing the green development of the oil and gas industry.

  • Analysis of Market Competition Pattern and Development Prospect of Soil Remediation Industry in 2019

    In 2019, the Soil Pollution Prevention and Control Law was officially implemented, and the supporting Technical Guidelines for Contaminated Land Risk Management and Soil Remediation Effect Assessment (Trial) and some other documents gradually normalize the technologies and remediation effects of the industry.
     
    Meanwhile, judging from the annual remediation funds appropriated by the central government, the budget in 2019 has experienced a transition after a decline, with a sharp increase of 42.9% to CNY5 billion, and the proportion of soil remediation funds among pollution prevention funds (atmosphere, water and soil) also grows from 7.95% in 2018 up to 8.33% in 2019.


     
    With the continuous improvement of laws & regulations and the sufficient willingness of the central government to pay funds, polluting enterprises and real estate enterprises are accelerating the overall arrangement of soil remediation. At present, there are three main types of participants in the soil remediation industry: the first kind is environmental protection-related research institutes and universities, which are technologically advanced with the support of scientific research capabilities, and are mainly involved in the investigation and evaluation of contaminated sites, equipment R&D and contracting of partial remediation projects, with a relatively weak overall project contracting capacity. The typical representatives are the Institute of Geographical Sciences and Natural Resources Research and Nanjing Institute of Soil Science under Chinese Academy of Sciences.
     
    The second kind is domestic professional environmental restoration engineering companies, most of which are specially established by mature environmental protection engineering companies to develop the soil remediation market, and some are transformed from local environmental protection departments and investment companies, having rich experience in order acquisition, project management, and project operation. The typical representative enterprises are Beijing GeoEnviron Engineering & Technology, lnc., BCEG Environmental Remediation Co., Ltd. and Zhongke Dingshi Environmental Engineering Co., Ltd.


     
    The third kind is internationally famous remediation companies and joint ventures, such as Japan Dowa Group, US TRS, MC2 and ERM Group, and Dutch FUGRO Group. A variety of enterprises mainly rely on consulting management, analysis and testing, and cooperate with domestic engineering companies to establish joint ventures to directly access to the soil remediation process.
     
    In general, research institutes have advantages in technology. Domestic enterprises have rich experience in mature project operations, and foreign-funded enterprises are mainly cooperative. The overall market competition is at an early stage, and the pattern has not yet formed. In addition, since the soil remediation has been in the stage of detailed investigation and transition to governance in the past three years, the market structure has changed greatly. Coupled with the start of some local restoration cycles, there will inevitably be a rapid growth in the initial stage of industrial development and the emergence of SMEs, so the concentration is not high.