Monthly Archives: May 2015

GN Drilling Waste Management for OBM and WBM Treating

GN Solids Control has been designing and manufacturing many sets of drilling waste management systems for global clients. Now GN solids control and drilling waste management equipments are exported to over 60 countries.
GN Drilling Waste Management systems can treat oil base mud, water base mud. It’s obvious to know, in order to get a better separating performance we need to treat the oil base mud and water base mud separately. GN waste management systems are composed of cuttings dryer and decanter centrifuge.
The largest advantage of GN cuttings dryer is it can treat with OBM and WBM. For some drilling rigs, in the primary drilling period most of the fluids are water base mud, the oil based mud will be used as the rig drilling much deeper. So only buy one cuttings dryer, you can use it for all the drilling process.
Now many large clients are using GN drilling waste management systems, such as Shell used one whole unit to separate the OBM in the shale gas drilling process. And Baker Hughes is using 4 sets of drilling waste management systems to do their drilling work in extremely cold environment.GN Drilling Waste Management System

According to the survey made by Shell, oil in the final cuttings treated by GN cuttings dryer will be around 5%, and it will be reached to 3.75% when you feeding with few drilling mud.
Now GN has upgraded our cuttings dryer to the forth version: the rotating speed can reach to 1200 RPM, separating performance is better than the third version. For the decanter centrifuge, GN engineers also gave some creative and practical modifications: mud is feed to the large end of the rotating bowl, some outlets on the screw propeller is added, one flexible bow is fixed on the solids discharge port to avoid block etc.
The standard GN drilling waste management systems can treat with much more solids with a satisfied performance. For further details, welcome to contact us freely by

Different Usages for GN Cuttings Dryer and GN Hi-G Shaker

GN Solids Control manufactures 60 sets to 100 sets cuttings dryers every year. It can be used to separate OBM or WBM. Usually, in order to save cost the Hi-G shaker will be a replacement solution to separate the WBM, while the cuttings dryer can be used to treat OBM.
For the cuttings that separated by shale shaker, mud cleaner, it contains around 20% oil. Then these cuttings will be feed into the cuttings dryer. If we use GN High G Drying Shaker, normally we can get the oil on the cuttings around 10-12%. But if we use GN cuttings dryer, we can get the oil on the cuttings to be 3-5%. For every 100 Tons drilling cuttings, without using TDU to heat the drilling cuttings, our clients can recycle additional 7 Tons oil.

GN Cuttings Dryer
The treating capacity of GN vertical cuttings dryer is around 30~40 Tons/H. Solids that larger than 250 microns will be separated out, while the smaller size solids will be left in the drilling fluids.
The wet material enter the TDU will reduce the capacity dramatically as we know. The solids come out from GN cuttings dryer and GN Hi-G shaker can be send to TDU for further separation, but due to the oil in the cuttings is not the same ( 3-5% OOC cuttings after treated by GN cuttings dryer and 10-12% OOC cuttings after treated by GN Hi-G Shaker), the difference is pretty obvious. By using the cuttings dryer, it will increase capacity of the TDU, and the electricity cost will be saved.

GN Hi-G Shaker
The wet material will also increase the load of the other unit of TDU system. Like the Vapor Recovery Unit, Cooling Tower Skid, Oil water separator etc. As we know, the capacity for TDU is very small if the material especially when the materials are very wet.
Generally Speaking, considering the TDU don’t have a large treating capacity, so the cuttings can be treated by one GN cuttings dryer, one GN Hi-G shaker. Sometimes, you also need one GN decanter centrifuge for much finer solids separation.

Mud recycling system with decanter centrifuge for HDD

GN solids control new designed mud recycling system with decanter centrifuge has been used for HDD mud recovery. Normally the client did not use decanter centrifuge, but for some special projects, the solids size are very fine, the 4 inch desilter cones are not enough, they have to use the decanter centrifuge to separate the fine solids. CPP, short for China Petroleum Pipeline Bureau, is the China largest Horizontal Directional Drilling Contractor, they have bought over 30 sets of muf recycling system from GN solids control in the past 5 years. Some of their mud recycling systems are tradional design with only shale shaker, desander, desilter 3 phase cleaning , some are with decanter centrifuge because of high percentage of fine solids in the drilling fluids.

This time they bought 4 sets of 1000gpm Mud Recycling System with GNLW452 middle speed decanter centrifuge, which is one of the most reliable working, high treating capacity with separation point 5 microns.

1000 gpm mud recycling system

The main features of the 4 sets of mud recycling systems are the equipments are installed in a 20ft standard container frame, and the mud tank size is replaceable with standard 20ft container, during working, they are installed with screws. And during transportation from one place to another, they will be shipped by the vehicle fit for 20ft container size. This is for fast move, fast disassembly, fast installation purpose.

Not only for the mud recycling system, we can also adopt such design into drilling waste management system design for the same reason. In some cold temperature area, you can cover some tarpaulin outside the 20ft steel frame to keep them warm in winter, so you can save the money of heating lines to keep them warm and fluxible.

If you need a similar design for your HDD,CBM, underground construction, mining project, pls contact GN sales.


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