Changqing Oil Drilling Cuttings Treatment Case

After drilling and completion of more than 20 oil Wells in Longdong main oil area of Changqing Oilfield, more than 8,000 tons of downhole cuttings generated from the production site were transported to the local Qingcheng brick making enterprise for secondary utilization to make sintered bricks, thus solving the problem of comprehensive treatment of drilling waste in oilfield development and realizing the safe and environmental protection resource utilization of water-based cuttings. This is only a microcosm of the industrial reapplication of oil and gas drilling cuttings to save energy and reduce consumption.

Effective utilization of solid waste resources is the best way to dispose drilling cuttings. In the early stage, since the “collection while drilling” treatment of drilling waste in Changqing Oilfield, the cost of outsourcing drilling cuttings is high, and the disposal occupies a lot of land, and there is a large safety and environmental protection risk. The relevant technicians selected nearly 100 oil and gas Wells in the whole oil and gas field according to different regions, formations and drilling fluid systems for sampling while drilling, and the test results all showed that water-based drilling cuttings were general industrial solid wastes. Researchers have carried out detailed analysis and testing of drilling cuttings, and innovated a variety of resource utilization ways such as paving of cuttings, paving well sites and making brick from cuttings, and improved the geotechnical properties of drilling cuttings, forming the drilling cuttings adding a certain proportion of lime and fly ash, which can meet the requirements of paving well sites and roadbed. By analyzing the characteristics of the cuttings, the additive formula of the cuttings free brick is overcome, which is based on ordinary Portland cement and supplemented by water-based epoxy resin. At the same time, the firing process of the cuttings, clay and coal gangue of the sintered brick is studied.

Changqing Oilfield has made a breakthrough in the non-landing disposal technology of rock cuttings to make the drilling site clean. The treatment process of “miscible collection + rubber breaking and destability + plate and frame press filtration” was established to achieve the maximum solid-liquid separation and the solid water content was less than 75%. To solve the problem of low pressure filtrate recovery rate after plate and frame filtration, in order to recycle liquid phase between Wells or well sites, an integrated treatment agent with a variety of mixtures was developed. The liquid phase recovery rate was greater than 65%, meeting the Class I industrial solid waste, solving the contradiction between mud non-landing process and drilling production, and fully realizing the transformation and upgrading from “in-situ curing” to “clean” treatment.

At present, the disposal and resource utilization technology of drilling cuttings in Changqing Oilfield has reached the industry standard in terms of pollution control, process design and operation management involved in the resource process of water-based drilling cuttings and liquid phase, and has realized the full coverage of safe and environmental protection disposal of drilling mud in Sulige, Yulin, Yan ‘an and other places in Changqing oil and gas area. It has obtained 5 invention patents, introduced 3 Changqing oilfield standards and 1 industry standard, further standardized the resource utilization of solid waste in oil and gas fields, reduced regional environmental risks, and turned waste into treasure after millions of square drilling cuttings and oily sludge treatment in oil fields.

KOSUN- China Solids Control Leader&Drilling Waste Management Expert
WhatsApp/Wechat:+86 13379250593
Contact person: Monica Li
Online consulting:

What are the drilling methods?

  1. Jet drilling
    The high-pressure mud transported by the mud pump forms a high-speed impact jet (usually above m/s) through the drill bit nozzle, which directly acts on the bottom of the well, making full use of hydraulic energy (generally more than 50% of the pump water power acts on the bottom of the well), so that The cuttings are washed away from the bottom of the well in time or the formation is directly broken, which can greatly increase the drilling speed. A reasonable way to work is to use higher pump pressure, lower displacement and smaller drill nozzle diameter. Optimized parameter drilling is based on the analysis of drilling data, using electronic computers as a means, and using optimization methods to combine various controllable factors that affect the drilling speed (such as drill bit type, bit weight, rotation speed, mud performance, hydraulic factors, etc. ), establish a mathematical model and compile a calculation program based on the lowest cost principle. Optimal cooperation is carried out to achieve high-quality, fast and low-cost drilling work.
  2. Formation pore pressure prediction and balanced pressure drilling
    Use seismic, logging and drilling data (mechanical penetration rate, shale density, mud gravity, temperature, etc.) to conduct comprehensive analysis to predict formation pore pressure and determine possible abnormal pressure formations, and take timely measures to prevent sudden occurrences Complex underground situations such as blowout, lost circulation and well collapse. Based on the known formation pore pressure and formation fracture pressure, determine reasonable mud specific gravity and casing procedures. Drilling under conditions where the mud column pressure and formation pore pressure in the well are approximately balanced is called balanced pressure drilling. It can significantly increase the drilling rate and is also beneficial to the discovery of oil and gas reservoirs. Well control technology: When drilling into abnormally high-pressure formations and mud gas invasion or well kick occurs, calculation methods and appropriate technical measures are used to adjust the mud proportion and flow characteristics, and use hydraulic high-pressure blowout prevention equipment to control and eliminate well overflow. , to prevent blowouts.
  3. Core taking technology
    According to the design requirements, rock samples (cores) of the required layers are drilled from underground to obtain primary data for the exploration and development of oil and gas reservoirs. Commonly used coring tools are mainly composed of core drill bits, core barrels, core grabs, joints and other components. During coring drilling, the drill bit continuously cuts the rock at the bottom of the well in an annular shape, so that the drilled columnar core continuously enters the core barrel. In order to meet special needs, there are also closed coring, pressure maintaining coring and coring tools (rubber sleeve coring tools) for extremely loose and broken formations.

The vacuum degasser is a new type of special equipment used to deal with gas intrusion into drilling mud

The vacuum degasser is a new type of special equipment used to deal with gas intrusion into drilling mud. During the drilling process, it plays an important role in restoring mud specific gravity and stabilizing mud performance. This innovative technology revolutionizes the way gas intrusion drilling mud is managed, providing the oil and gas industry with a more efficient and effective solution.

Gas intrusion in drilling mud can cause various problems such as reduced drilling efficiency, formation damage, and wellbore instability. Vacuum degasser solves these challenges by removing entrained gases such as methane, carbon dioxide and hydrogen sulfide from drilling fluids. This process helps maintain the integrity of the mud, ensuring it can effectively carry cuttings to the surface and provide adequate support for the wellbore.

The working principle of the vacuum degasser is to create a low-pressure environment in the container to separate the gas from the mud. This is accomplished through the use of a vacuum pump, which draws the gas-laden slurry into a degassing unit. Once inside, the slurry is agitated to release the entrained gas, which is then expelled from the system. The degassed mud is then returned to the mud circulation system, ready to continue its role in the drilling process.

One of the main benefits of using a vacuum degasser is its ability to improve the overall performance of the drilling mud. By removing entrained gas, the mud’s specific gravity is restored, ensuring it can effectively suspend and transport cuttings. This helps maintain wellbore stability and prevent problems such as kicks and blowouts. In addition, the removal of gas enhances the rheological properties of the mud, ensuring that it maintains its desired properties throughout the drilling operation.

Overall, vacuum degassers have become an indispensable tool in the oil and gas industry, providing a reliable and efficient means of managing gas intrusion into drilling muds. Its ability to restore mud gravity and stabilize mud properties makes it a valuable asset in ensuring a successful drilling operation. As technology continues to advance, vacuum degasser will play an increasingly important role in optimizing drilling processes and improving overall operational efficiency.

Sand pumps are important equipment used to transport slurry in various industrial applications

Sand pumps are important equipment used to transport slurry in various industrial applications. It plays a vital role in the efficient movement of mud, making it an indispensable tool in the drilling and mining industry. Sand pumps are designed with a range of features that make them functional and efficient.

One of the key components of the sand pump is the impeller, which adopts a closed design to ensure high transmission efficiency. This design allows for seamless movement of slurry, allowing the pump to handle large volumes of material with ease. The efficient operation of the impeller helps improve the overall performance of the sand pump, making it a reliable choice for demanding applications.

In addition to the impeller, the sand pump is also equipped with a highly wear-resistant carbide mechanical seal. The seal is designed to withstand the wear and tear of mud, ensuring a long service life for the pump. The wear-resistant properties of the seals make sand pumps suitable for continuous operation in challenging environments, providing durability and reliability in slurry transfer.

In addition, the versatility of sand pumps is highlighted by their ability to serve as injection pumps or downhole supply pumps for drilling rig mud pumps. This flexibility allows the pump to adapt to different operating requirements, making it a versatile solution for a variety of slurry transfer needs. Whether used as an injection pump or downhole supply pump, sand pumps provide consistent performance and reliability when handling mud.

Overall, sand pumps are important equipment for efficiently transporting slurry in industrial environments. Its advanced features, including a closed impeller design, highly wear-resistant mechanical seal and versatility, make it a valuable asset in applications where reliable mud movement is essential. With high transfer efficiency and long service life, sand pumps are a reliable solution for transporting slurry in harsh industrial environments.

KOSUN is one of the top-ten solid control companies with independent design and production capacity

Xi’an KOSUN is a professional solid waste equipment manufacturer that has long been committed to resource conservation and environmental protection. Based on the manufacturing of environmentally friendly separation machinery and equipment, it provides solid waste treatment-related products and services in the petroleum and petrochemical, It is applied in six major fields including engineering machinery, industrial sludge treatment, river and lake sludge and urban sludge treatment and disposal, soil remediation, and comprehensive utilization of tailings. The products serve more than 50 countries and regions around the world.

Xi’an KOSUN’s main products:

Solid control equipment: drilling fluid shale shaker, desander, desilter, mud cleaner, decanter centrifuge, vacuum degasser, mud mixer, jet mixing device, liquid-gas separator, sand pump, screw pump, mud tanks, etc.
Solids control system: skid-mounted solids control system, low-temperature solids control system, desert mud solids control system, mobile solids control system.
Drilling waste treatment: vertical cuttings dryer, screw conveyor, drying screen, oil-based mud treatment system, water-based mud treatment system, oily sludge treatment system.
Engineering construction mud treatment: shield mud-water separation system, shield mud treatment system, trenchless mud recovery system, etc.

KOSUN- China Solids Control Leader&Drilling Waste Management Expert
WhatsApp/Wechat:+86 13379250593
Contact person: Monica Li
Online consulting:

Description of Petroleum Drilling Mud Circulation System Process

The petroleum drilling mud circulation system is a system used in the process of petroleum drilling to circulate and treat drilling mud. The main purpose of this system is to maintain wellbore pressure, cool the drilling bit, suspend drill cuttings, lubricate the drilling tools, and separate drill cuttings and other solid particles to ensure a smooth drilling process.

The petroleum drilling mud circulation system typically consists of wellhead equipment, solid control equipment, liquid phase treatment equipment, pump station system, and control system.

The mud returned from the wellbore is transported to the shale shaker and mud cleaner on the tank via the return line (elevated trough and support) either separately or simultaneously. After being processed by the shale shaker, the mud first goes to the sand settling tank for sedimentation. The settled mud then enters the vacuum degasser for degassing, and the degassed mud goes into the desilter. The desilter pump draws the mud from the desilter to feed the desilter cyclone, and the mud processed by the desilter cyclone enters the desander. The desander pump draws the mud from the desander to feed the desander cyclone, and the mud processed by the desander cyclone enters the mud mixing tank. The mixing pump draws the mud into the centrifuge feed pump tank, and the centrifuge feed pump supplies the mud to the centrifuge for solid-liquid separation. The mud processed by the centrifuge enters the matching tank. The mud processed by the centrifuge can be adjusted for its properties using the weighting pump and weighting hopper, and the mud with adjusted properties is then used through the mud pump pipeline and suction of the mud pump. This completes a large circulation of drilling fluid purification.

The design and configuration of the petroleum drilling mud circulation system may vary depending on different drilling conditions, well depths, and drilling objectives. Through proper system design and operation, efficient, safe, and environmentally friendly drilling processes can be achieved.

KOSUN Drilling Cuttings Management System-Drilling Waste Management

In the ever-evolving world of drilling operations, efficiency and cost-effectiveness are key factors for success. That’s why the KOSUN Drilling Cuttings Management System is an invaluable tool for operators.

Drilling Cuttings Management System

The KOSUN drilling cuttings management system is specifically designed to extract drilling fluid from drill cuttings and clean the drilling fluid for reuse. The main objectives are to maximize drilling fluid recovery and minimize drilling waste, thereby saving costs for the operator. This not only improves operational efficiency but also promotes environmental responsibility.

The system is versatile and can effectively handle oil-based and water-based drill cuttings. For oil-based drilling cuttings, it can reduce the oil content to 3% to 5%, making the drilling fluid suitable for reuse. On the other hand, water-based drill cuttings, reduce the moisture content, making transportation easier and more economical.

The KOSUN drilling cuttings management system effectively saves costs for operators by recycling drilling fluid. This is achieved by significantly reducing the need to purchase new drilling fluid, thereby minimizing operating expenses. Additionally, by reducing the amount of drilling waste, the system can also help operators save on the expense of disposing or further processing the waste, resulting in further cost savings.

KOSUN Drilling Cuttings Management System’s ability to maximize drilling fluid recovery and minimize drilling waste can directly result in significant cost savings for operators. Additionally, its environmental benefits and promotion of sustainable practices make it a valuable asset to the modern drilling industry.

In summary, with the KOSUN Drilling Cuttings Management System, operators can rest assured that they are not only maximizing efficiency and cost-effectiveness but are also contributing to a greener, more sustainable future for the industry.

Tags: drilling cuttings management system, drilling waste management, oil-based drilling cuttings

KOSUN- China Solids Control Leader&Drilling Waste Management Expert
WhatsApp/Wechat:+86 13379250593
Contact person: Monica Li
Online consulting:

Xi’an KOSUN provides cost-effective oilfield waste management solutions

Are you in the oilfield drilling industry? Are you looking for efficient and cost-effective solutions for managing oilfield waste? Look no further than KOSUN Machinery. We provide a full line of drilling waste management equipment to help you effectively handle oilfield waste and reduce the cost of waste management.

KOSUN Machinery understands the challenges that come with oilfield waste management. Our products are designed to help operators run closed-loop mud circulation systems, allowing for the efficient and environmentally friendly handling of drilling waste. With our equipment, you can minimize the impact of drilling on the environment while also maximizing cost savings.

Our drilling waste management equipment is designed to meet the specific needs of oilfield operations. From solids control equipment to waste management systems, we offer a comprehensive range of products to ensure that your drilling waste is effectively managed. Our team of experts can also provide tailored solutions to meet the unique requirements of your operation.

At KOSUN Machinery, we are committed to providing high-quality products that offer superior performance and reliability. Our equipment is built to withstand the demanding conditions of oilfield drilling, ensuring that you can rely on it to deliver consistent results day in and day out. With our products, you can streamline your waste management processes and focus on maximizing the productivity of your drilling operations.

In addition to our industry-leading equipment, KOSUN Machinery also offers exceptional customer support. Our team is dedicated to helping you find the right solutions for your drilling waste management needs. Whether you need guidance on product selection or assistance with installation and maintenance, we are here to help every step of the way.

When it comes to oilfield waste management, KOSUN Machinery is the name you can trust. Our proven track record of delivering top-quality products and reliable support has made us a preferred partner for oilfield operators worldwide. With our comprehensive range of drilling waste management equipment, you can rely on us to help you achieve your environmental and cost-saving goals.

In conclusion, if you need efficient and reliable solutions for managing oilfield waste, KOSUN Machinery has got you covered. Our full line of drilling waste management equipment is designed to help you run closed loop mud circulation systems and reduce the cost of drilling waste handling. Contact us today to learn more about how our products can benefit your operation.

TOP 10 Largest Drilling Waste Management Companies list

KOSUN- China Solids Control Leader&Drilling Waste Management Expert
WhatsApp/Wechat:+86 13379250593
Contact person: Monica Li
Online consulting:

Analysis of the basic steps of the mud purification systems

With the implementation of new environmental protection laws, the requirements for environmental protection in the oilfield development process are becoming increasingly stringent. Clean production in oilfield operations is a benchmark in the petroleum industry. During the oilfield development process, a large amount of waste mud is the main factor causing environmental pollution and is also one of the high-cost factors in oilfield operations. Therefore, it is important to purify and recycle the mud, which can not only meet environmental benefits but also generate significant economic benefits.
To meet the requirements of mud purification, the petroleum machinery industry has introduced various effective mud purification equipment and systems.
The five-level mud solid control equipment on the oil drilling platform can ensure that the platform meets the requirements for mud treatment under various conditions. The solid control equipment used in mud purification systems operations mainly includes mud circulation tanks, drilling fluid shale shakers, mud cleaners, vacuum degassers, low-speed centrifuges, and high-speed centrifuges.

Kosun mud purification systems

The mud with a large amount of harmful solid phase particles returned from the wellbore flows into the entrance of the first-stage mud purification equipment, the drilling fluid shale shaker, through the wellhead elevated mud trough with a certain slope under the action of gravity. The larger harmful solid phase particles are screened out and discharged by the shale shaker.
When the drilling fluid is invaded by gas, the purified mud obtained through the drilling fluid shale shaker enters the desanding tank of the mud purification tank. By using the suction of the degasser vacuum pump, negative pressure is created in the vacuum tank, allowing the mud to enter the degasser for separation under atmospheric pressure. The separated gas is released at the top of the derrick, and the degassed mud is driven by the rotating impeller of the discharge chamber into the second chamber of the mud purification tank. In the case of gas-free mud, the degasser can be used as a high-power mud agitator to prevent the mud in the mud purification tank from settling.
The purified mud obtained through the drilling fluid shale shaker enters the desanding tank of the mud purification tank. The mud is pressurized and enters the desander of the second-stage solid control equipment, the mud cleaner, through the desanding pump. It is separated again using the cyclone principle to remove harmful solid phase particles with a separation midpoint above 70 microns. The desanded mud is then discharged into the third chamber of the mud purification tank through the overflow pipeline of the desander. According to the overall requirements of the mud purification system, the processing capacity of the desander should exceed 125% of the normal mud circulation volume to ensure sufficient repeated purification of the mud in the purification tank and reduce the sand content in the mud.
The purified mud obtained through the desander is pressurized and enters the desilter of the third-stage purification equipment, the mud cleaner, through the desilting pump. It is separated again using the cyclone principle to remove harmful solid phase particles with a separation midpoint above 36 microns. The desiltered mud is then discharged into the fourth chamber of the mud purification tank through the overflow pipeline of the desilter.
The bottom flows discharged from the desander and desilter contain a certain amount of mud. After the two bottom flows converge, they enter the shale shaker of the combined cleaner for further screening. The recovered mud is returned to the mud tank, while the sand and mud are discharged.
Even after three stages of purification, the mud still contains a large amount of harmful solid phase particles. When the mud is in a non-weighted state, two centrifuges are used in parallel to remove harmful solid phase particles larger than 5 microns. The processed mud is discharged into the fifth chamber of the mud purification tank.
When the mud is in a weighted state, the drilling fluid centrifuge not only removes harmful solid phase particles but also removes the weighting material barite from the mud, resulting in a rapid decrease in mud density and a significant loss of weighting material. To avoid the loss of weighting material and achieve the goal of removing harmful solid phase particles, two centrifuges are used in series, with the medium-speed centrifuge as the first stage and the high-speed centrifuge as the second stage.

The weighted mud extracted from the mud tank by the feed pump of the low-speed centrifuge is processed by the centrifuge, and the processed mud enters the mud purification tank. The bottom flow (containing a large amount of barite) is discharged into the dedicated tank below the medium-speed centrifuge. It is pumped into the second-stage high-speed centrifuge for further separation. The mud containing barite returns to the mud purification tank to maintain the stability of the mud’s performance. The separated harmful solid phase particles are discharged outside the system, achieving the goal of purifying and maintaining the stability of the mud’s performance.

The specific configuration of the solid control equipment at each level will be adjusted according to the specific conditions of the operation site to achieve the best mud purification and recovery effect.

KOSUN- China Solids Control Leader&Drilling Waste Management Expert
WhatsApp/Wechat:+86 13379250593
Contact person: Monica Li
Online consulting:

We Urgently Need Efficient Drilling Waste Management Solutions.

We urgently need efficient drilling waste management solutions.
Why was there so much waste in early oil drilling?
There were several reasons for the generation of a significant amount of waste in early oil drilling:
One of the most important reasons is the lack of technological advancements, in the early days of oil drilling, the technology and techniques were not as advanced as they are today. This resulted in less efficient drilling processes, leading to a higher volume of waste generation.
Another vital reason is inadequate waste management practices. The understanding of proper waste management practices was limited during the early stages of oil drilling. There was often a lack of awareness or regulatory requirements regarding the proper handling and disposal of drilling waste.
Due to the limited environmental regulations, environmental regulations and standards regarding waste management were not as stringent or well-established during the early years of oil drilling. This allowed for more lenient practices and less focus on waste reduction and proper disposal.
Another important reason is economic considerations, in the early days of oil drilling, the primary focus was on extracting oil as quickly and efficiently as possible. Waste management and environmental concerns were often secondary considerations, resulting in less attention given to waste reduction and disposal practices.
It is important to note that with advancements in technology, increased environmental awareness, and stricter regulations, the oil drilling industry has made significant progress in minimizing waste generation and implementing proper waste management practices.

Tag: efficient drilling waste management solutions,