Drilling Mud Recycling System

Recently we finished production of one set of solids control system to India, including shaker tank and decanter centrifuge tank system. This is a 5 phase separation mud tank system for 1500HP oil drilling rig. The working principal is as below:

1） 3 units of shale shaker as the first phase cleaning to separate the big solids bigger than 100 microns from the drilling fluids, it can be used for both water based mud and oil based mud or synthetic oil based mud. The shaker screen installed on the shale shaker is composite material frame shaker screens comply with API RP13C.

The possem belly is installed behind the 3 units of shale shaker as drilling fluids distribution box and collect the drilling fluids from the mud gas separator or from the elevated manifold directly.
2) desander cone is the second phase cleaning to separate the cut point below 45 microns. The fluids with solids below 45 microns will drop into the mud tank compartment. The 2# centrifugal pump suck the drilling fluids from this compartment and feed to 4 inch desilter cone.
3) desilter cone is the third phase cleaning to separate the cut point below 25 microns the fluids below 25 microns will drop into the desilter compartment and the submersible slurry pump will suck the mud from this compartment and feed to GNLW452C decanter centrifuge.

4) middle speed decanter centrifuge is the fourth phase cleaning to separate the cut point 5~7 microns for barite recovery.
5) high speed decanter centrifuge is the fifth phase cleaning to separate the solids 2~5 microns for high gravity solids, especially when the drilling fluids has been reused for several years, the fine solids is accumulated a lot and it can not be reused again, then the high speed decanter centrifuge is required to lower the solids content.

2 more construction slurry cleaning system for vacuum tanker vehicle is ready for shipment to USA, this is the client’s repeat order. After use the previous 2 system at their work site successfully, they repeat the order for another 4 units, this is part of their new order. They have given some good suggestions to improve the system efficiency and to be user friendly.
The basic working principal is as below:

The slurry collection hopper collect the construction slurry from vacuum tanker vehicle, this is special designed slurry collection hopper — a large open top hopper with 3-side weir surrounded, 1 side is low weir for slurry feeding from the vacuum tanker vehicle. The coarse solids separation shale shaker is sitting on it, the separated coarse solids/stones are collected by cuttings box, the clean slurry is dropped into the collection hopper and feed to the fine solids separation shale shaker by the submersible slurry pump. The fine mesh screen is installed on the fine solids separation shale shaker with composite material frame shaker screens for longer working life. GN can produce composite material shaker screens comply with API RP13C from API 20 to API 325. The slurry discharged shale shaker is feed to mud cleaner with desilter cone, the separation cut point is 25 microns by centrifugal pump, the discharged solids is drying by the bottom shaker screens.

The clean slurry is feed to high speed decanter centrifuge by working with dewatering unit by the screw pump, we have different size decanter centrifuge with different treating capacity for option, the bowl size with 9 inch, 14 inch, 18 inch, 22 inch, 30 inch. To get much pure water, sometimes chemical should be add to improve the separation efficiency.
If you have similar project, welcome to contact with GN sales engineer.

One set of oil sludge treatment system is ready for shipment for one client in China. The technical configuration for GN oil sludge treatment system is as below:

1) Pre-mixing tank modular: including mud tank, heating lines inside mud tank, handrails, walkway, pipelines, stairs, etc. Submersible slurry pump as feeding pump of shale shaker, mud agitator to mix the oil sludge after heating and chemical jetting process, liquid level meter and electric control system.
2) Coarse shaker modular: including mud tank with heating lines, shale shaker installed on the shaker tank with internal spray system and sealing cover, mud agitator to mix the oil sludge, liquid level meter, and mud tank accessories with lightings, electric control system.

3) Centrifuge modular: including decanter centrifuge with feeding pump, 3 phase centrifuge with flushing pump, decanter centrifuge installed on the mud tank to separate solids from fluids, the clean fluids flow to 3 phase centrifuge to separate oil from water, the pure oil is recovered and flow to buffer tank with liquid level meter. The pure water is flow to buffer tank with liquid level meter, it can be pumped to water storage tank automatically or back to the circulation to reuse.
4) Chemical dosing system to add chemicals in premixing tank and centrifuge package modular, all the accessories are installed in the container for convenient shipment and better production.

We have 3 standard models oil sludge treatment system for option, with 1m3/h, 5m3/h, 15m3/h, we can also design customized oil sludge treatment system for our clients. Our engineer will fly to client’s jobsite for first time installation and commissioning and training the client’s engineer.
Except for oil sludge separation system, we also produce automatical tank cleaning system, waste water treatment unit,oil water separator, slant plate clarifier. And we have vacuum pump to feed the water to the oil sludge separation system.

As a professional piling desander unit manufacturer in China, our desander unit has been widely used for bored piling project and TBM project in the world and domestic market. Recently we shipped 10 units of 500gpm desanding unit to Asia client. The configuration is as below:

1) 1 ea of 10 inch desander cone installed on the double deck shale shaker, the separation cut point is 40 microns.
2) The double deck shale shaker is installed on the V bottom mud tank, the feeding pump of the desander cone is installed on the mud tank as compact design.
3) No mixing hopper and mixing pump is included in the desanding unit, if the client need mud mixing unit, we will provide a separate jet mud mixer with a storage tank to connect with the desanding unit.
The working principal is as below:

1) The submersible slurry pump outside is feeding the bored piling or TBM slurry to the double deck shaker bottom screen, to separate the coarse solids from the slurry, the slurry is dropped into the mud tank, the centrifugal pump will transfer the slurry to the desander cone to separate the fine solids up to 45 microns. The double deck shale shaker can increase the treating capacity and better separation performance.
2) The clean fluids are flow to a separate mud tank for reuse, the user can connect the jet mud mixer with this tank to add chemicals and prepare for new fluids.
3) The centrifugal pump installed in the desander unit is produced by GN solids control, the pump head and all the parts are interchangeable with world famous brand centrifugal pump. The wear parts impeller, mechanical seal and pump casing is made of hard ductile iron alloy for better abrasion resistant.
If you need mud desander unit, pls contact with GN solids control.

2 sets of vertical cuttings dryer system are shipped to domestic client. GNCM-40B standard drilling waste management system configuration is as below:

1) Vertical cuttings dryer GNCD930E: this is the ideal equipment to treat the oil based drilling waste or Synthetic based drilling cuttings, the oil on the separation cuttings is below 5%, which can meet the disposal limit for most countries, if the client need it to be lower, TDU can be applied.

2) Decanter centrifuge GNLW363C-VFD: This is the best sold model decanter centrifuges among all the series. The decanter centrifuge max speed is up to 3900rpm, the normal speed is 3200rpm to treat the low gravity solids. The max G force is up to 3062G, the typical G force is 2062G, the cut point is 2 ~5 microns. Except for GNLW363C-VFD decanter centrifuge with 14 inch bowl diameter, we can also produce GNLW364EP-VFD to treat the waste water when the water clarity is required strictly. If the client need bigger treating capacity, we will suggest 18 inch, 22 inch, 30 inch centrifuge bowl.
3) Submersible slurry pump GN50YZ20-18A as feeding pump of decanter centrifuge, this is not the best option pump to feed the fluids to the decanter centrifuge, but it is vertically installed, it can save space on the mud tank compared with screw pump, also the maintenance cost is cheaper compared with screw pump. The screw pump works steadily to feed the decanter centrifuge, the flow rate can be adjusted by VFD control panel by changing the frequency.
4) 2 units of Mud agitator installed on the mud tank to mix the drilling fluids
5) Mud tank skid, the decanter centrifuge are installed on it, the vertical cuttings dryer is installed on the frame. The complete skid for convenient transportation.
For more information, pls contact GN solids sales.