Author: gnadmin

Soil pollution mainly comes from oil and gas drilling, production and processing process, such as oily sludge, drilling waste mud, and waste residue from oily sewage treatment. Sometimes the crude oil, liquid type oil waste and other waste will also generate contaminated soil during the storage, transportation and processing.

The oily soil treatment solution main purpose is to separate oil phase ( water and solids content in oil should be less than 3%), water phase and solids phase ( oil content should be less than 2%), to recover oil and water, the oil can be sold, the water can be sent to waste water treatment facility or back to circulation system. The solids disposal is a big problem, the target is to safely dispose the solids at the lowest cost, and recycle the useful oil and water as much as possible. The oil could be sent to thermal unit to reduce the oil content below than 1% as per the regulation of the client’s country .We have standard design of oily soil treatment system for your option, also our technician can study you project and design a customized system for your special requirement within your budget.
The oily soil treatment system consists of crushing screening bucket, feeder, conveyor system, material pre-mixing treatment, cylindrical scrubbing pulping, first stage separation treatment, mud heating and diluted, shale shaker separation, 3 phase oil/water/solids separation centrifuge, chemical dosing unit, etc. The heating premixing module including heating and pre-mixing tank, mud agitator, feeding pump, electric control system, liquid level control system, heating pipeline and manifold guardrail, walkway; The shale shaker separation module including coarse solids separation shale shaker with spray nozzle and cover, feed pump, fine solids separation shale shaker with spray nozzle and cover, heating and pre-mixing tank, mud agitator, screw pump and static mixer, electric control system, etc.

Recently one set of ATEX standard explosion proof decanter centrifuge are shipped to Middle East Customer. The features of the decanter centrifuge are as below:

1. VFD control panel is positive pressurized VFD control panel with HMI smart control, comply with Europe ATEX explosion proof standard with air conditioner for cooling, which can work under ambient temperature up to +55 ℃.
3. The decanter centrifuge bowl is made of duplex stainless steel 2304, the screw is made of stainless steel 316L for heat treatment, the screw is protected by tungsten carbide tiles for longer working life, the open impeller will improve the centrifuga capacity. The bearing is made from SKF brand, the electric motor are ATEX explosion proof standard.
4. The centrifuge bowl diameter is 14 inch, the bowl length is 50inch, max bowl speed is 3900rpm, typical bowl speed is 3200rpm, the max G force is 3063G, and typical G force is 2062G
5. The variable G force and variable frequency design allow the wide application of the decanter centrifuge, GNLW363 recommend speed for barite recovery is 1800~2000rpm, for high gravity solids is 2200 ~2700rpm, for low gravity solids is 2700~3200rpm. The decanter centrifuge can be widely used for drilling fluids solids control, drilling waste management system, oil sludge treatment system, flocculants enhanced centrifuge dewatering unit and industrial waste water treatment.
   Except for solids liquid separation decanter centrifuge, GN solids control also produce 3 phase decanter centrifuge, 3 phase disc centrifuge, 2 phase disc centrifuge, the bowl diameter ranged from 9 inch, 14 inch, 18 inch, 22 inch and 30 inch. For drilling waste management system, we also produce vertical cuttings dryer, screw conveyor and skid mounted system. If you need a ATEX, IEC EX standard decanter centrifuge for onshore or offshore project, pls contact with GN solids control.

What is waste treatment in oil & gas drilling industry? It is the solution for Containment, Transportation, Treatment and Disposal of the drilling wastes. Its purpose is to protect the environment, to reduce the pollution,, to reduce the drilling waste disposal cost, to recover more useful drilling fluids for reuse.
The drilling fluids treatment process is that the mud generated from well head flow to solids control system for treatment, the useful fluids are reused to prepare for new drilling fluids by mixing with proper chemicals, the solids are drilling waste, which is a combination of solids and liquids, take oil based drilling waste as example, according to API solids size classification, the coarse solids size are bigger than 2000μm, the medium solids size range is 74~ 250μm, which can be separated by shaker screens, the fine solids size range is 44~74μm, which can be separated out by desander cone, the ultra fine solids size range is 2 ~44μm, which can be separated by 4 inch desilter cone and high speed decanter centrifuge, the colloidal size is smaller than 2μm, with chemical dosing unit, the dewatering centrifuge can separate it out. To improve the drilling waste treatment efficiency, the best solution is waste minimization.
The drilling waste treatment solution including cuttings handling system and cuttings treatment system. The cuttings handling system mainly consists of augers, waste collection hopper, vacuum pump, etc, the screw conveyor collect the drilling waste from solids control primary shaker and transfer to vertical cuttings dryer or high G drying shaker. The cuttings treatment system consists of vertical cuttings dryer, high G drying shaker, dewatering centrifuge, feeding pump, tank skid, skip, etc.
If you need drilling waste management solution for both onshore and offshore drilling rig, pls contact with GN solids control.

Recently one set of construction mud solids liquid separation system are shipped to Australia, the equipments list are as below:

1. Linear Dewatering Vibrating Screen, GNLMZ1236
   GNLMZ1236 dewatering vibration screen is especially designed to remove coarse solids from construction mud. Construction slurry dumped into a big hopper by the hydrovac truck. The main components including vibration motor, vibration beam assembly, upper beam assembly, feed end beam assembly, wallboard, support base, damping spring, adjusting pad, polyurethane screen panel, rail seat. Different with oilfield used shale shaker, the dewatering vibrator with a positive inclination angle of 4 degree adjustable, the design is suitable for different requirement to treat materials. The rubber damping spring with good damping effect, low noise, good resilience, stable mechanical performance, longer working life.
   2 Double Deck mud treatment shale shaker, GNZS706, after the big stones are separated, the double deck shale shaker top layer screen is to separate the coarse solids of the slurry, the bottom layer screens are separated the fine solids size and reduce the solids content.
2. Mud cleaner with desilter cone, GNZJ703, after the fine solids are separated out by the double deck shale shaker bottom layer screen panel, the mud dropped into the fluids catching tank and the centrifugal pump suck the mud and feed the desilter cone, the separation cut point is 20 microns.
3. Dewatering decanter centrifuge, GNLW553C-VFD, once the solids size bigger than 20 microns are separated mostly, the decanter centrifuge feeding pump will transfer the fluids to dewatering centrifuge for dewatering, proper chemicals will be added to improve the separation efficiency. The discharged fluids will be much clean which can be reused or disposal.
5. Chemical dosing unit, both of the dewatering centrifuge and chemical dosing unit are designed as modular design, they are installed inside the container for convenient transportation and operation.

If drilling waste disposal cost is not an issue, then all the drilling waste generated can be disposal, if necessary, it can be shipped to other facility for treatment. Actually if some of the material can be recycled and reused, the solution is much more economic, that is why most contractor will select to treat the drilling waste and recycle to reduce the treatment cost and also disposal cost. To treat the drilling waste, firstly we need to know the nature of drilling waste. The drilling waste contains a large amount of base fluid, whether that fluid is diesel oil, mineral oil, olefin, ester, or water. For example, for the offshore drilling waste, diesel oil is an obvious contaminant, diesel oil-based drilling fluids and drilling waste will not be discharged into the sea. The drilling waste can be treated onsite or collected and shipped to other facility for treatment.

When oil based drilling waste is treated onsite, the vertical cuttings dryer system will be installed at the rig site. There are 2 ways to collect the drilling waste from solids control equipments, one way is to collect the drilling cuttings from primary shale shaker by screw conveyor, and transfer to vertical cuttings dryer, another way is to storage the drilling waste in a waste pit and use the excavator to pick up the waste from waste pit to drilling waste management system.
If water based drilling waste is treatment onsite, the high G drying shaker with VFD decanter centrifuge will be installed, the high G drying shaker is to separate the coarse solids and reduce the solids content, the decanter centrifuge will separate the solids particles cut point up to 2 microns. The discharged fluids can be recycled, if it is required to be disposal, proper chemicals will be added.