Oil sludge treatment refers to the sludge and waste generated during the production process of oilfields due to oil and gas drilling, crude oil extraction, oil storage, transportation, processing, and drilling mud recycling. These wastes all contain crude oil and some components of crude oil.

Oilfield sludge and oily waste is mainly divided into: oil sludge pit generated by the mud treatment system, sludge generated by tank cleaning, flotation scum, etc.

GN Solids Control utilize heating and chemical washing technology to treat various sizes and various designs of oil sludge and oily waste. This month, GN Solids Control is making a Modular Oil Sludge Washing and Separation System for an Uzbekistan Customer.

The modular Oil Sludge Washing and Separation System for the Uzbekistan customer includes the following modules:
Module 1: The Material suction vacuum pump module: it is including air compressor, air tank and vacuum pump. The vacuum pump is a special pump focusing on solids and liquid transfer. It suits for long distance discharge.

Module 2: The Premix and hot washing module. There are heating pipes on the mud tank and equipment to heating the oil sludge at a suitable temperature. This is to reduce the density and viscosity of the oil sludge.

Module 3: The Vibrating screening module. There is a double deck shale shaker for the module. There are jetting nozzles on each deck of the shale shaker for heating the oil sludge. The system can use hot water and hot steamer to heat the material.

Module 4: The Decanter centrifuge separation module. It is for solid and liquid separation, the purpose of the decanter centrifuge is to remove the ultra fine solids.

Module 5: Oil-water-slag three-phase separation module. There are 3-phase centrifuge to separate the oil, water and soil.

Module 6: Chemical dosing module. The chemical dosing module is to supply chemicals for the whole system.

GN Solids Control makes various types of decanter centrifuge for oil and gas drilling rigs. There are different models and various standard decanter centrifuge designed for onshore and offshore drilling rigs, as well as for water well drilling rigs, workover drilling rigs, development drilling rigs, high temperature and deep drilling rigs, etc…

Based on the bowl diameter of decanter centrifuge, GN Solids Control makes mini size 9 inch decanter centrifuge which is mainly used for mining and slurry treatment. GN Solids Control has hundred 9 inch decanter centrifuge running in Canada for mining slurry separation. And 14 inch, 18 inch, 22 inch for oil ans gas drilling, as well as for industry liquid / solids separation. The largest size decanter centrifuge GN Solids Control makes is 30 inch huge bowl centrifuge which is used for mining and industry slurry separation.

Based on the type of control panels, GN Solids Control offer below type of decanter centrifuges:

1) Fixed speed decanter centrifuge. The bowl speed and conveyor speed of the centrifuge is fixed. For this type of centrifuges, GN Solids Control can offer additional pulley and belt. If clients want to run the centrifuge at another fixed speed, they can choose another set of pulley and belt. It is the most economic solution to run the centrifuge at different speeds. And the fixed speed centrifuge is easy for operation and maintenance.

Even on the fixed speed control panel, GN Solids Control can offer the control function for feeding pumps. There must be interlock function between centrifuge control and pump control for over load protection.

2) Variable frequency drive centrifuge, which is short for VFD centrifuge. GN Solids Control offers Explosion Proof Pressurized Control Panel for centrifuges. The VFD panel can be either cooling by vortex tube cooling system, or explosion proof air conditioner system, to ensure the internal of the VFD panel stay at 25C degree around. It is the most suitable temperature to ensure the lifetime and performance of electrical components. Normally, GN Solids Control offer 3 VFD control on the VFD panel: VFD control for main drive, for back drive motor and pump drive motor.

3) Full hydraulic drive FHD decanter centrifuge. And the supplier from Switzerland are leading brand for centrifuge hydraulic driving system.

GN Solids Control makes full line solids control equipment for onshore and offshore drilling rigs, like shale shaker, mud cleaner, desander, desilter, decanter centrifuge and drilling mud mixing system.

Recently, GN Solids Control just finished 3 sets Drilling Mud Desander and Desilter Assembly for offshore drilling company. It is 3-in-1 mud cleaner which is shale shaker complied with desander and desilter assembly. The model is GNZJ594F-3S12N. It is 1500GPM mud cleaner. The 3 sets 1500GPM mud cleaner is specially designed with lifting frame. And it is tested by authorized third party for CCS lifting certificate. It is specially designed to suit for marine offshore platform.

Unlike onshore drilling mud solids control equipment, the offshore drilling mud solids control equipment is usually higher standard. Below are some of the difference, which make the equipment cost for offshore drilling rig mud system is higher than offshore.

1) It’s up to the end users. Some end users can accept normal explosion proof motors. Some offshore rig projects requests equipment which are equipped with marine explosion proof motors and control panels. It is higher standard for anti-corrossive from sea water and mist.

2) The painting for offshore drilling is different with offshore projects. Powder painting is widely used for onshore equipment. Powder electrostatic spraying can get thicker coating, and the coating has good corrosion resistance. In addition, dusting can cover up some marks that can’t be done by spray paint, and it is not easy to scratch. The important thing is that the dusting powder is an environmentally friendly material, does not contain VOC, is non-toxic, and does not pollute the environment; But powder painting is not suitable for offshore platform. It is not as good anti-corrosive performance as normal painting.

3) Most offshore platform have special request on lifting design and lifting certificate. The lifting design and lifting certificate is up to the project request. GN Solids Control can offer offshore lifting certificate by DNV or by CCSI. If clients prefer certificates issued by other parties, please check with GN sales engineers.

GN Solids Control makes various sizes drilling mud solids control system for various sizes workover rigs. The most popular drilling mud systems are made for 550 hp workover rigs and 750HP workover rigs.

There are the active mud tank system, mud mixing system and mud reserve system equipped for workover rigs.

1) The Trip tank with trip pump and a small mud agitator.

2) Active tank system is equipped with separation and mixing equipment. Below are the popular equipment used in active mud tank:

1 ~ 3 Shale shakers and mud cleaner. If for 550 hp workover rigs and 750HP workover rigs, clients can choose a shale shaker. Or choose 2 shale shakers: one for use, the other one is for back up.

Some times, clients will choose a vacuum degasser after shale shaker and before mud cleaner. GN Solids Control vacuum degasser is self-suction type. There is a small vacuum pump inside the mud vacuum degasser. Clients do not need to equip a separate feeding pump. It saves power and save space.

The mud cleaner can be 1000 GPM and 1500 GPM models to suit for the mud system handling capacity. For the 2 mud cleaner models, the under flow shale shaker model is the same. For 1000GPM mud cleaner, there is 2 no. 10 inch desander cones with 12 no. 4 inch desilter cones. For 1500 GPM mud cleaner, there is 3 no. 10 inch desander cones and 16 no. 4 inch desilter cones.

Mixing hopper or mud shearing hopper with mixing pump to prepare qualified new mud for the drilling rigs.
3)Mud suction tank. There is charging pump / pumps connected to suction tank and feed mud for drilling rig mud pumps.

4) Centrifugal pumps are widely used in the drilling mud recovering system. The pump can be used to feed for desander and desilter cones. And the centrifugal pump is also used as charging pump for mud pump, and mixing pump for the mixing system.