Drilling Mud Recycling System

Recently one batch of solids control equipments are shipped to oilfield service company for their drilling rig. The equipments list including 4 units of GNZS594F-SHBF shale shaker, 1 unit of GNZJ594F-3S16N mud cleaner, 2 units of GNLW454ET-VFD decanter centrifuge.

GNLW454ET-VFD decanter centrifuge is a 18 inch bowl decanter centrifuge with 74.5 inch bowl length, the clarification cone is longer, so that the treated fluids is much cleaner, the discharged solids is much drier, the treating capacity is bigger than GNLW453-VFD decanter centrifuge, but smaller than 22 inch bowl decanter centrifuge GNLW553C-VFD. The designed capacity is 400gpm, for drilling fluids treatment capacity is 300gpm. The max bowl speed is 3500rpm, typical bowl speed is 0~3200rpm. Max G force is 3084G, typical G force is 0~ 2578G. the main motor, back drive motor and pump motor is same with GNLW453 decanter centrifuge, the gearbox ratio is 57:1. The centrifuge bowl is made of duplex stainless steel by centrifugal casting, the screw propeller is made of SS316L and protected by tungsten carbide tiles. The fluids distribution port and solids discharged port is protected by tungsten carbide alloy, the bearing is from SKF for longer working life.

The GNZS594 series shale shaker with 4pcs shaker screens, the total screen area is 2.73m2, 4pcs of shaker screens are attached with the shale shaker for free, which is composite material frame shaker screen with SS316 material wire mesh for longer working life and better corrosion resistant. The mud cleaner is a desander cone, desilter cone and bottom shale shaker 3 in 1 equipment, we select 3 ea of desander cone and 16 ea of desilter cone to meet the client’s treating capacity 1500gpm requirement.

If you need linear motion shale shaker, mud cleaner, decanter centrifuge, etc. solids control equipments for your drilling rig, pls contact with GN solids control.

Recently GN solids control finished production of one set of GNTBM-360 Slurry Separation Plant for pipe jacking engineering company. The main equipments including shale shaker, desander, desilter, bottom shaker, desander feeding pump, desilter feeding pump, mud tank, etc.
The technical configuration is as below:

1. The system treating capacity is 360m3/h.
2. The separation cut point is 20 microns, if the client need 2 microns cut point, decanter centrifuge can be applied.
3. The TBM slurry separation plant transportation dimension for land freight is 6058 x 2438x2891mm, total power consumption is 162KW. When the slurry separation plant is under working condition, the dimension is 6058x3004x4922mm.
4. The coarse solids separation shaker model is GNZKR-1230, the screen area is 3.6m2;
6. the mud cleaner model is GNZY705E-Y3S16N, the bottom shale shaker is a double deck shale shaker, with desander cone 10 inch 3ea, desilter cone 4 inch 16ea, the total treating capacity is 360m3/h. the screen area is 4m3. The vibration strength is max 7.5G ( adjustable), the desander feeding pump is GNSB8X6-14/12J, the desilter feeding pump is GNSB8X6-14/12J.
   The compact design with big treating capacity can meet the client’s requirement, the dimension is same as 20ft container size, which can be transported by container trailer.
   The working process is that the TBM slurry is feed to the coarse solids separation shaker for pre-treatment, the big solids, stone, sand will be separated out, the fluids drop down to the fluids catching tank. The desander feeding pump feed the slurry from catching tank to desander cone, the fluids flow to intermediate tank and the desilter feeding pump feed the fluids to desilter cone, the clean fluids flows to storage tank. The solids dropped down on the bottom screen for drying and separated out.
   Except for 360m3/h slurry separation plant, we also have 240m3/h and 500m3/h for option.

3 phase decanter centrifuge is the common used equipment for oil sludge separation unit and oily water separation project, based on client’s different requirement for the treatment result, we will select proper equipments, 3 phase decanter centrifuge or 2 phase decanter centrifuge plus 3 phase disc centrifuge. They have their own advantages and disadvantages.

3 phase decanter centrifuge is a solids, liquid, liquid 3 phase separation machine, the 2 phase liquids should have specifically different density, and the solids phase should be specifically heaviest phase, which can be easily separated. The separation principal is sedimentation, when the oil sludge is feed to the centrifuge inlet pipe and enter into high speed bowl, the material rotates synchronously with the bowl. When gravity is different, the generated centrifugal force is also different, the solid phase ( the heaviest phase) with largest gravity, then water phase with 2nd largest gravity , the oil phase with the lightest phase and smallest gravity. The solids phase is in the outtest layer of the screw, the oil inside, the centrifugal force became less from outside to inside. The solids are pushed by the screw conveyor, the water which is heavier is discharged from the nozzle in the upper position of the big end, the oil which is the lightest phase will be discharged from the bottom nozzle of the bid end. The solids, oil, water discharged from 3 phase centrifuge is not with high quality, if your requirement is very concerned about the oil quality for recovery , water quality to be sent to waste water treatment facility, solids quality for disposal, it can not meet your requirement.

Another solution is to use 2 phase decanter centrifuge plus 3 phase disc centrifuge, it separated the working process as solids liquid separation firstly, then liquid liquid separation, with proper chemicals adding and heating, the treatment result can reach expected target.

This week GN solids control shipped one batch of waste sludge dewatering equipments to Environmental company, including: Dewatering Centrifuge, Screw Press Dewatering Machine, and Chemical Dosing Unit.

The dewatering centrifuge package including one unit of dewatering centrifuge, 1 set of mud tank to collect the clean fluids, one unit of submersible slurry pump as centrifuge feeding pump, 1 unit of mud agitator for agitating the slurry. The chemical doing unit will feed the prepared chemicals to the dewatering centrifuge and well mixed in the centrifuge feed tube, then the mixture chemicals and slurry will be enter into the dewatering centrifuge, under the working of G force, the light fluids are discharged from fluids discharge port, the solids are discharged from solids discharge port, both of the fluids distribution port and solids discharge port are protected by tungsten carbide alloy, and it is interchangeable once damaged.

The Screw Press Dewatering Machine is a sludge extrusion dewatering equipment. The working principal is by the strong squeezing force generated by the change of screw diameter and screw pitch, and the tiny gap between the floating ring and the fixed ring, to realize solid-liquid separation. It can be widely used for dewatering the industrial waste sludge, oil waste sludge and other sewage treatment projects. It can work continuously and automatically, it will not block frequently. It is energy saving and environmental friendly solution, compact design with small footprint, only need a small space to locate it. Just compared with dewatering centrifuge, its treating capacity is not so high. Especially for oil sludge treatment, decanter centrifuge treatment result is the best. But screw press is with lower energy consumption and a little lower cost. Compared with screw press and decanter centrifuge, filter press investment is very high, and efficiency is lower, discharged solids is drier.

Recently GN produced HDD mud reclaimer for international drilling company are ready for shipment, including 2 sets of GNMS-500D desander unit, 1 set of mud mixing tank, 1 set of dual deck shale shaker. The technical configuration is as below:

2 sets of GNMS-500D desander unit: this model is the widely used for HDD mud recycling, TBM slurry desanding, piling slurry cleaning works. It is a compact design mud cleaning unit, which can be used when treatment result of solids separation cut point 45 microns is acceptable, and space is very limited, and budgetary is limit, the user do not need a desilter cone treatment ( the solids cut point is 20 microns) or they can prepare for an extra desilter or decanter centrifuge as further treatment. Normally when GNMS-500D desander unit is applied, the user will make a storage tank or mixing tank with mixing hopper and mixing pump locally, the clean fluids discharged from the desander unit will flow to the mixing tank directly, it will be used to prepare for new drilling fluids for reuse purpose. The desander unit including a double deck shale shaker with hydrocyclones, centrifugal pump, catching tank, electric control system with pipelins, tank accessories.

The mixing tank is customized design , which consist of 2 venturi hopper with 2 mixing pump installed on the skid.
The double deck shale shaker working principal is as below:
A slurry pump pick up the HDD slurry from mud pit to the feed port and flow to the buffer tank, the coarse solids will be separated by the top layer shaker screen, the fluids drop down on the bottom screen for drying and collect more useful fluids. The clean fluids will drop down into the mud tank and the solids are separated out.

If you need HDD mud reclaimer, pls contact with GN solids control.