GN CBM Drilling Mud System

What is Geothermal drilling

Geothermal drilling is used for geothermal steam and hot water well drilling. It is a special technology and necessary method for the exploration, exploitation of geothermal fluid.

For the high temperature geothermal drilling, drilling depth is generally 500 meters to 2000 meters, a little more than 2000 meters, mostly in 600 ~ 900 meters. Regariding to the conduction type geothermal field at low temperature, the average depth is 1800 meters, while the geopressured geothermal drilling can reach to 6000 meters depth.

Features of mud recycling system for Geothermal drilling

1) As the temperature of Geothermal drilling is normally higher. There should be mud cooler before mud recycling system and after mud comes out from well head.

2) There should be galvanized grating to cover the tank tops for a better heat-radiation. Checkered plate is not recommended for Geothermal drilling mud recycling system. The heat cannot come out well in this condition.

3) Normally, there is only desander cone in the mud recyclone system. Desilter cone is not used.

4) As the mud temperature is higher, PU hydraocyclone is not suitable for Geothermal drilling mud recycling system, while cast iron cyclones should be used.

5) And in some cases, geothermal drilling rig platform is low, it means the flow height from drilling rig to shale shaker is lower. It gives strict limitation on shaker tank design.

GN Solids Control got an inquire from a European Geothermal drilling company. They are searching for a mud recycling system for their 750hp Geothermal drilling, and they want a 3-tank mud system.

After communication, we know that their flow height is only 2.6m. Per their condition, we offer tech. proposal together with commercial proposal, customer satisfy and give us order soon. And the system will be dispatch to jobsite soon.

Below is the system proposal we offered for the 750hp Geothermal drilling rig.

1) Shaker tank #1: 6012×2200×1600mm

2) Mixing tank 2# and Storage tank 3#: 11500×2200×2350mm

3) Shale shaker linear motion

4) Desander separate

5) Mixing system and mud agitators

Decanter centrifuge is the effective equipment used to treat drilling fluids in oil and gas drilling, in CBM drilling or in TBM projects.

In order to meet different customers’ request, GN Solids Control have different model high speed centrifuge GNLW363 and low speed centrifuge GNLW452, with big bowl centrifuge GNLW553, GNLW453, normal size centrifuge 14’’ and the mini centrifuge GNLW223.

GN Solids Control is the most professional Chinese manufacturing on oil and gas drilling field decanter centrifuge. It makes high standard decanter centrifuge to cater for international market who is concerning on top quality. GN also makes economic standard to compete with China normal brand, price good but and quality still better than normal Chinese brand, to cater for customers who want to save cost.

Difference of GN international high standard and GN economic standard

1) Bowl material and conveyer:

High standard centrifuges use Duplex Stainless Steel 2205 by centrifugal casting, while economic standard use stainless steel 304 material

2) Screw protection

High standard centrifuges use interchangeable Tungsten Carbide Tiles, while economic standard centrifuge use ceramic tiles.

Remarks: Normal Chinese brand only use hard surface welding. The protection material is very thin. It is difficult for maintenance or prepare.

3) Bearing brand:

High standard centrifuges use famous brand SKF / FAG original bearing. While economic standard use NSK brand bearing.  

4) VFD control system

High standard centrifuges is 3 VFD for main drive motor, back drive motor and feeding pump. It useS PLC for smart control. The VFD panel is positive pressurized for hazardous areas. And with ATEX or IEC standard for option.

GN different standard decanter centrifuge can be used for both solids control and drilling waste management field. Beside decanter centrifuge, GN also makes other solids control equipment, like shale shaker, desander, desilter, mud cleaner, agitator, jet mud mixer. On drilling field management field, besides decanter centrifuge (normal size or big bowl), GN also makes vertical cuttings dryer, screw conveyer, NEMO pump, high G drying shale shaker.

If you have any inquire or any question on mud solids control & drilling waste management field, welcome you contact GN Solids Control company for solution.

Applications of dewatering unit
1) Dewatering unit is an important part for waste water treatment.
2) Combined with high speed or super high speed decanter centrifuge, dewatering unit is widely used for water base mud drilling cuttings treatment.
3) Dewatering unit can be used in TBM (Tunnel Boring Machine) drilling mud system
4) Dewatering unit can be used in dredging slurry separation system in civil projects. In this case, it is used together with belt compressor.

Flocculants is the most important part to effect dewatering unit performance. In order to insure a better performance of dewatering unit, we should pay attention on below points:
(1) If the surface of the flocculants powder is dissolved too rapidly, there will be particle mutually attached, therefore it will cause the particle interior does not be dissolved completely; the usual operation is to use various types of dispersing and dissolving device.
(2) Per different conditions, the time used to dissolve the flocculants varies. The main factors may as below:
A. The types of flocculants be used;
B. The water quality used as dissolution;
C. The temperature of water
D. The mixing efficiency.
Normally, its takes around 1hour for flocculants powder to be fully dissolved. If the flocculants cannot be mixing completely, it will reduce the performance.

Dewatering unit Design in drilling waste management field
Dewatering unit is usually put into container. GN Solids Control company offers 20ft containerized dewatering unit and 40ft containerized dewatering unit.
Dewater centrifuge for dewatering unit can be put into the container, inside the container or even on the top of container.

When dewatering unit is used together with decanter centrifuge. It should pay attention to that: the chemicals should add on centrifuge feeding pump outlet pipe, and before enter into centrifuge. The mud cannot be mixed with chemicals and then transfer to centrifuge. Pls refer our former mail for dewatering unit pipeline.

GN solids America has 2 units of variable frequency drive decanter centrifuge in Houston warehouse, we accept to make test firstly in the factory before shipment, welcome to contact GN solids sales to arrange for a test.

Working principal of VFD decanter centrifuge:

GN use Netzsch Brand NEMO pump to feed the drilling mud into the feed tube and flow to the centrifuge bowl, the bowl rotates high speed under , the screw conveyor, which is inside the bowl ,get a differential speed through the gearbox. The bowl and conveyor compose the pulley and belt with the differential speed and rotates in the same direction.

Under the working of different centrifugal force , the heavier solids paticles is pushed to the inner bowl and pushed theought the screw to the solids discharge port, the lighter weight fluids is settle down and discharged through the fluids output port, which with 6pcs adjustable dams to adjust the fluids pond depth inside the centrifuge bow.

Viriable frequency drive decanter centrifuge can adjust the screw rotary speed to achieve different working purpose. For example, when start the centrifuge, firstly you start it with a low frequency to get a lower electric currency to protect the VFD control panle, when it works stably, you can adjust the frequency to your required data to get your required performance. For the drilling mud with high gravity solids, 2500rpm rotation speed is required; for the drilling fluids with low gravity solids, 3200rpm is recommend. To collect the barite, 1800rpm is recommend. But such recommendation is just for oil & gas drilling, not inludes food, waste water, etc.

Applications of GN decanter centrifuge

1 solids control system, working to separate fine solids 2~5 microns

2 drilling waste managements system, working to separate the fine solids from the recycled mud from linner shale shaker

3 Liquid mud plant, working to separate fine solids and re-mix the drilling fluids, which can be re-used by the rig.

Mud System Check List

http://mengda0312.over-blog.com/2014/10/mud-system-check-list.html

Double deck shale shaker is widely used in CBM drilling (Coal bed methane), piling, micro tunneling and other HDD rig mud system as its big capacity and compact design. The top deck shaker screen can use steel screen (0.1mm, 0.2mm, 1mm etc… per jobsite condition) to separate the coarse size. The bottom deck use normal pretensioned frame screen (API40, 60, 80 etc…)

Parameters of GNZS705 double deck shale shaker

Model:                            GNZS705E

Vibration Mode:              Linear Motion

Vibration Motor:           2×1.94KW, Voltage and Frequency customized

Vibrating Strength:          ≤7.5G (Adjustable)

Treating Capacity:          528GPM(120m³/h)

Deck Adjustment:          -1°~5°

Top Shaker Screen:        3 Panel 2.1m3

Bottom Screen:                3 Panel 2.6m3

Weir Height(Back type buffer box):      895mm

Shaker deck material:           Stainless Steel

Weight:                            2000kg

Dimension (mm):                    2717x2012x1413

Remarks: Treating capacity test from mud:1.2g/cm3density & viscosity 45s & 60 mesh screens

Applications of GNZS705 double deck shale shaker

GNZS705 is a hot sale shaker model made by GN Solids Control company It is a double deck shale shaker with 5 screen panels: 2 screen panels in top deck and 3 screen panel in bottom deck. When the shaker model is used in CBM drilling system, piling system or micron tunneling mud cleaning system, customer choose steel frame screen for long lifetime and big volume. It is a common shaker model for GN compact mud system. It can even be used in GN350~500GPM HDD mud recycling system for small footprint and economic price.

Advantages of GNZS705 double deck shale shaker

1) The shaker model is made from Stainless steel material for better performance on anticorrosive.

2) Vibrating motor from world famous brand: IEC Ex, ATEX and UL Certified (Italy Oil or Martin brand motor, etc…)

3) The whole shaker deck is made from hot treatment. It is more stronger under high G force vibration.

4) Patent tighten rubber sealing for shale shaker deck and screen. It is with long life and easy for replacement.

5) Pretensioned shale shaker screen mounted with wedge for fast screen change.

6)  Flexible options on feeding type: Weir Feed, Top Feed, and Hopper Feed for different applications

7) The shale shaker can be mounted together with desander cone and used as a mud cleaner.