KOSUN Integrated Environmental Drilling Waste Management Scheme
By integrating the advanced drilling waste management methods and experience at home and abroad, KOSUN puts forward a "one-stop" drilling waste management scheme. The drilling waste can be achieved zero discharge by the 4 steps of drilling waste management scheme which are drilling waste reduction at source, recycle and reuse, recovery, as well as retreatment, for the purpose of effectively providing high-quality environmental services for drilling waste management in drilling engineering.
“Inverted Triangle” Principle of KOSUN Integrated Drilling Waste Management
Reduction at Source:
Reduction at source is to use the four-stage of solids control equipment (shale shaker, desander, desilter and decanter centrifuge) for the drilling fluids according to drilling site conditions. Maximize to improve the efficiency of solids control equipment, to avoid drilling mud overflow caused by equipment failure or improper operation. So that to maximum recover the drilling mud, improve its cyclic utilization rate and reduce the volume of drilling mud on cuttings. The drilling waste can be actually reduced at source to minimize waste discharge.
Recycle and reuse:
Water is the most important resource at drilling site, and it is most likely to cause pollution especially at oil and gas drilling field. Generally, oil and gas is distributed in areas where water is scarce; therefore, water resources are very precious and rational utilization of water resources is necessary. Large quantity of waste water will be produced at the drilling site, and the water-based drilling fluid also contains plenty of water. Such waste water can be treated by using some advanced technologies such as dehydration and water treatment, etc. After fully treated by high-speed centrifuge, waste water filter system and purification system and met the recycling requirements, the water resources can be put into drilling operation for recycle and reuse.
Recovery:
Plenty of drilling mud adhesion on the surface of cuttings is removed during the treatment process of solids control equipment, which will significantly increase the drilling cost. Hi-G dryer can reduce the OOC down to about 10%. And the vertical centrifuge can minimize the OOC to below 5% through centrifugal filtration with slow rotating speed. Therefore, Hi-G dryer or vertical centrifuge can be used to effectively recover drilling mud, reduce drilling cost and minimize drilling waste volume.
Treatment:
The discharge standard still cannot be met after a series of recycle, reuse and recovery. We can adopt solidification, thermal desorption, cuttings re-injection and other treatment technologies at the final stage of drilling waste management to ultimately achieve zero discharge.
KOSUN DW600 Treatment System While Trilling
KOSUN LS584-D Hi-G Dryer:
KOSUN linear motion Hi-G Dryer is used to recover the water-base and oil-base mud from drilling cuttings, in order to reduce the liquid/oil content on drilling cuttings down to 10% (w/w). It can not only recover the drilling mud to reduce drilling cost, but also minimize the drilling waste volume to reduce environmental pollution.
KOSUN D450L Mobile Dewatering Unit
APPLICATIONS
Offshore and onshore rigs running water-base systems where there are limited- or zero-discharge regulations, where there is a scarcity of water, and/or where it is necessary to drill with a low-density or clearwater system.PROBLEMS
Colloidal-size particles build up in the fluid system, require dilution which can create excessive fluid volumes. There ultra-fine particles, less than 5 to 7 microns in size, cannot be removed via centrifuge alone. The excess waste volumes created by dilution add to drilling costs and increase environmental liability.SOLUTIONS
The dewatering systems use a combination of chemical treatment and centrifugation to separate these ultra-fine particles from the fluid system effectively and economically.
Dilution
If needed, dilution water is added. Some fluids have extremely high concentrations of fine solids and need more free water for proper treatment. The centrate, water extracted by the centrifuge, can be used for some of the dilution water.Coagulation
There are two main types of coagulants: organic and inorganic. They reduce the electrostatic charge of the particles and enable them to stick or bond together when they make contact with each other. At higher concentrations, the inorganic salts can form large precipitates, called sweep flocs that also envelop the colloidal particles. Note: Some inorganics could add to your waste-disposal stream.Flocculation
The next step in the process involves the addition of a special polymer flocculant to the coagulated fluid. The polymer forms bridges between the coagulated particles, enabling them to physically join together into larger, porous, three-dimensional structures known as “flocs”. Compared to the original colloidal-size particles, these larger flocs are relatively easy to remove as a moist sludge.Centrifugation
The final step in the dewatering process is the removal of the flocculated solids with a high-speed centrifuge to generate a solids-free, reusable, recovered fluid.KOSUN Thermal Desorption Centralized Management System
An increase in global awareness of the need for environmental preservation has led the drilling industry to adapt to changes in environmental policies. Nation environmental laws are now being strictly enforced and companies must adapt their policies to abide by these regulations. The treatment of drill cuttings with thermal desorption provides an excellent option for meeting these standards.
Benefits
Thermal Desorption Process
1.Pre-Treatment2.Feed Hopper3.Main Processor4.High-Temperature Section5.Discharge6.Condenser7.Separator8.Oil/Water Discharge9.Boiler for HTO
