HDD machinery

GN Solids Control is one of the well-known International Brand for drilling Mud Solids Control System & Drilling Waste Management system. GN Solids Control offers the one stop solution for Solids Control treatment of oil gas drilling, CBM drilling, HDD, and water well drilling as well as the construction drilling mud treatment etc.

Nearly all drilling mud processing equipment containers shaker screen separation. Replacement shaker screen is a major wearing spare parts for drilling mud system. And it is a big and continue cost. GN Solids Control is specialized in high quality replacement shaker screen for various popular shaker models. GN Solids Control has his own R&D department for shale shaker screens. Clients can also contact GN Solids Control to make customized shaker screen.

Most solids control equipment manufacturer only make some kinds of processing equipment. Like some companies make shale shaker, mud cleaner and agitators, but they are not capacity to make decanter centrifuge or cuttings dryers. Some companies are only capacity to make centrifuges for various industries, they cannot make solids control separation equipment, like shale shaker, mud cleaner, degasser, etc…While some companies are only make pumps, they cannot make separation equipment. And there are some companies only make mud tanks, they are not capacity to make solids control separation equipment by themselves.

GN Solids Control is focusing on full line solids control equipment for various drilling mud. GN Solids Control is specialized in drilling mud liquid and solids separation. All the separation equipment are made by GN Solids Control. In this case, GN Solids Control knows more about the separation equipment, and can offer more reasonable proposal.

Furthermore, electrical control system is another essential point for separation equipment, especially VFD smart control panels for decanter centrifuges. GN Solids Control has his own electrical control department. GN Solids Control electrical engineering business department has comprehensive ability to provide solution for explosion-proof electrical control. GN is able to provide the electric control system, explosion-proof electrical enclosure design and development, fabrication, site installation, program debugging, and other services.

GN Explosion Proof Certification: GN Solids Control electrical control products have been certified by China National standard CNEx, International standard IECEx and European standard ATEX certificate, which enable GN’s products to meet high level market requirements.

GN Solids Control makes Mud Recycling System and desanding plants for construction Trenchless Engineering Companies, like for HDD (horizontal directional drilling), TBM (Tunnel Boring Machine), Microtunnelling, piling, etc…

GN Solids Control has more than 10 years of experience in the design and manufacture of mud recovery systems, especially in trenchless projects with multi-function and compact design to cater for different demands and applications from clients. According to the different requirements from users, and jobsite situations, GN Solid Control can provides different configurations of mud recovery system and desanding plant to meet the requirements of different working conditions. There are usually two types of mud purification systems suitable for trenchless construction: one is sand removal unit with cyclone purification system, we usually call it desanding plant. And the other type of design is self-contained mud recovery system.

The desanding plant with hydro cyclone purification system occupies a small footprint, and is economical and affordable. The system is composed of a hydrocyclone and a double deck shale shaker, both of which are installed on a small mud tank. The sand removal cyclone purification system is a two-stage separation device, and its function is to remove coarse particles from drilling mud. The desanding plant is mainly used in projects that can accept larger particle size solid drilling mud, such as Microtunnelling, piling, and so on.

The high standard self-contained mud recovery system developed by GN Solid Control is composed of four stage separations: shale shaker for coarse cuttings separation, 10 inch desander cone separation, 4 inch desilter cone separation, and decanter centrifuge for ultra-fine solid separation. The mud tank of the self-contained mud recovery system has a bigger storage volume to store the purified drilling mud. At the same time, it also has more tank surface space to arrange more separation equipment. Customer can also choose a centrifuge to reduce the ultra-fine solid in the drilling mud and to avoid the enrichment of the ultra-fine solid phase in the drilling mud.

GN Solid Control not only has a standard sizes of mud recycling system and desanding plant, but also provides custom-designed mud recovery system to meet for different demands.

Vertical rotating drilling rig is the normal machine used in piling project. During the drilling process, in order to protect the inner wall of the drilling hole and speed up the process, the operator always chooses to use drilling mud. Then here comes another problem how to reduce cost of the drilling mud thereby to reduce the cost of drilling. The solution is to use mud recycling system to make the drilling mud reusable.
The purpose of the mud recycling system is to remove the large size solid particles in the drilling mud by several separation machines. In regards to the mud recycling system for piling project, it could be a very compact design as separation process is not so complex as that for oil gas drilling. GN solids control is one of the most experienced separation solution providers who could provide the mud recycling system for almost all the industries will use it. GN already developed the standard mud recycling system especially for the piling project.


De-sanding Unit

Strictly speaking, the mud recycling system used in piling should be called de-sanding unit as the drilling depth is normally shallow and most of the solid particles are sand. A de-sanding unit would be enough for processing the separation to get the expected reusable drilling mud.
GN’s de-sanding unit is a compact structure 2 steps separation system. The main equipment in this de-sanding
unit is combined with a 2 layers shaker and cyclone manifold. The double layers shaker is used for coarse solids separation by the under layers and the upper layer screen is for drying the slurry discharged from the cyclone unit. The tank under the shaker unit is used to store the drilling mud. One centrifugal pump is installed in the system for transferring the mud to the cyclone unit for sand separation.
This de-sanding unit could be connected with extra mud tank for larger capacity mud storage. The operators can also equip a jet mixing unit to make an self-contained mud recycling system for other drilling project like HDD and water drilling.

The business of today’s GN has been divided mainly into 2 scopes, one is the normal drilling mud recycling, and the other is the waste management including the waste coming from petroleum related and other separation industries. This blog is mainly talking on the drilling mud recycling system that used in non oil drilling industry.
In oil drilling, the drilling depth and safety regulation request large drilling mud storage and more solids control equipment. Thus, the mud recycling system is always equipped with degasser unit and large volume mud tanks.


HDD Mud Recycling System

Comparing with the mud recycling for oil industry, the unit for non oil drilling is more compact and less equipment needed.

  • Trenchless/No Dig HDD project – The mud recycling system used in this type drilling is matching with a No dig rig. In some project for long distance pipeline and cables laying underground, it is inconvenient to dig an open groove on the ground as that will interrupt the normal traffic. The trenchless is an ideal choice. The mud recycling system for this project is always consisting of 3 stages separation as shale shaker unit, de-sanding and de-silting cyclone.
  • Piling is the main method to install the bridge supporting pillar. A de-sanding unit with a small tank would be enough to remove out the coarse solids from the drilling fluids. The de-sanding unit is a composition of de-sander cyclone and shaker unit that can separate out the solids with size of 40-70 microns. Piling does not request very clean mud; less equipment involved makes the recycling unit for piling is very compact.
  • GN also can manufacture the mud recycling system for tunneling project. For micron tunneling, GN has model available with capacity of 120m3/h, 240m3/h and 500m3/h. For large flow rate request, GN has the mud plant GNMS -3600M with treating capacity of 3600m3/H.

Tunneling Mud De-sanding Plant

Besides, GN’s mud recycling system can also be used in water well drilling, coal bed methane exploration, dredge slurry separation and the mining flushing waster cleaning process.

Most of the horizontal directional drilling mud system is not equipped with decanter centrifuge unit as by using the 3-phase separation system including shale shaker, de-sander and de-silter unit, it can work good enough for removing the solids from drilling fluids. Centrifuge is relative high cost, which is also a reason the drilling contractor doesn’t equip it in the mud system.

gn compact centrifuge system

GN Centrifuge System

However, for some high request drilling condition, the driller may use the heavy mud for better drilling performance. Sometimes the drillers add the certain chemicals to make the drilling mud heavier so that the mud can better protect the wall of the drilling hole. If the driller went to drill another well, the heavy chemicals need to be separated, and then the centrifuge could be used to do this job. In some other conditions, after many times recycling of the drilling mud, there is much ultra fine solid particles that cannot be removed by the shaker and cyclone unit, and then the centrifuge unit is needed.
GN Solids Control has nearly 10 years in fabricating the drilling mud system for HDD projects. This type mud system need to be compact structure and easy for transportation. See the picture in this article, both the de-sander and de-silter unit are equipped with under flow shaker for drying the discharged solids. The shakers used are 2-layer screen design. The bottom layer screen is used as primary shaker and upper layer screen to dry the discharges out from the cyclone units. This design greatly reduces the footprint of the mud system. And all tank top surface equipment are pre-installed on a frame with same base dimension as storage tank. When transport the mud system, the shaker and decanter centrifuge units could be removed by lifting the frame for fast disassemble. With the frame, the equipment could be easily transported by flat bed trailer.
GN can provide both standard and customized HDD mud system for clients. Just send us your request, and then you will get a satisfying and cost effective solution.

One set 500GPM drilling mud recycling system was sent to Middle East for water well drilling. Besides the drilling mud recycling system for oil drilling, they also need drill water well for daily requirement for clean water. For the person living in Middle East, water is more important than oil. Sounds like a joke, but this is reality.
Water well is not so deep like the oil well, and the drilling cost is also very cheap comparing with oil drilling. However, both this 2 drilling processes need the drilling mud recycling system to speed up the drilling process and protect the drill bit. Water well drilling may not need the used drilling mud to be separated very clean as it is not requested strictly. Just like this 500GPM unit shipped to Middle East, it is a very compact
model, while it has all the necessary separation equipment.


water well drilling mud system

It has one unit shale shaker GNZS703DZ with 3 panel screens which could remove out the solids always larger than 300 microns. This model is with the mud feeder on top of the shaker deck so that this shaker could be much more compact. As the water well drilling is always not so deep, hence, the solids coming out with the drilling mud is always not so hard. In this 500GPM mud recycling system, the de-sander cone is not equipped, but directly the de-silter cone would be used to separate the solids size of around 20 microns.
This 500GPM water well drilling mud system is a standard GN model GNMS-500G with 2 unit centrifugal pumps. One of each is used as feeding pump for the de-silter cyclone, and the other one is used for mud mixing, the mud tank is divided into 2 compartments. It has enough space for clean mud storage.
Though this 500GPM mud system is for water well drilling, it can also be used in other drilling project like HDD. As the working principle is completely the same. The customer killed two birds with only one stone.

For the upcoming no dig show this September in Australia, GN solids control would like to show there one set self-contained 200 GPM drilling mud recycling system for HDD projects. As a leading manufacturer especially for drilling mud recycling equipment, besides the large footprint mud system for oil drilling, GN solids control could also provide compact structure design mud recycling system.
According to the HDD rig mud flow, GN’s economic mud systems are classified as 150/200GPM, 350GPM, 500GPM, 800GPM/1000GPM and 1500GPM. Just like the unit of 200GPM would be shown in Australia, though it is small footprint, it has all necessary functions for drilling mud recycling and mud re-configuration.

2015.6.19 gn 200 gpm compact mud system for hdd (1)

200 GPM HDD Mud System

Below is the equipment list for the 200GPM unit
1. GNZY753-4N shaker and de-silter composition unit which has the functions for first stage primary solids separation and second stage for drying the solid discharged from the 4” cyclones. This unit has a top located buffer box for well back drilling mud feeding, the bottom layer screen of this unit remove the coarse solids, liquid goes through the mesh screen opening and gets down to the storage tank. Pumped by a 15hp centrifugal pump, the liquid was transferred to the de-silter cone for fine solids removing. The upper layer screen with much finer opening would block and separate out the finer solid cuttings.
2. GNSLM20A-110 Jet mud mixer is used for adding the mud chemicals and re-configuration of the drilling mud. The beneath located mud tank was divided into 2 compartments and one of them is used for mixing and storing the active drilling mud. The mixing pump adopted is same with the one for feeding to de-silter cones. That would be much easier for future maintenance and parts replacement. The mixing pump could also be used as discharging pump for transferring the active mud to the rig.

2015.6.19 gn 200 gpm compact mud system for hdd (2)

Compact Design Mud System

GN also has more compact unit for de-sanding, by connecting the de-sanding unit with a customized mud tank, the operator could run the mud recycling system more fit their own project condition. For more information on GN compact mud system, you may contact with GN team without hesitate.

As per the feedback from the customers who are engaging in the pilling business, GN designed and perfect the economic mud recycling system specially for the drilling mud cleaning application in piling project. On the consideration of limited location area of the piling project job site, GN’s piling mud recycling system is designed with a very compact structure but with full functions for drilling mud recycling.

GN economic desander unit (2)

De-sanding Unit

Below is the standard configuration of piling mud recycling system with treating capacity of 500GPM.
Model: GNMS500-D
Flow Rate: 500 gallons per minute
Cyclone Specs.: 1 pc 10” de-sanding cyclone made from 100% polyurethane
Screen Specs.: Shale shaker with up and down 2 layers screen with total screen area of 2.23m2
Feeding Pump: Mechanical seal type centrifuge pump of 50 HP used to feed mud to the de-sanding cyclone
Cut Point: Solids Removable down to 40 microns
Catching Tank: Under located catching tank for mud storage. The tank is equipped with lighting system and ladders for easy operation.
Electrical Control System: Explosion, water, and dusty proof electrical control panel with SIEMENS or Schneider components

GN also has the model of GNMS200-D and GNMS1000-D available and the treating capacity is separately 200GPM and 1000 GPM.
The advantage of this type mud recycling system is cost competitive. By connecting with storage tank and mud mixing hopper, this de-sanding unit could also be used in other kind of project like the small horizontal directional drilling, micro tunneling and water well drilling.

GN economic desander unit (1)

Economic Mud Recycling Unit Layout

GN recommends the layout of this economic mud recycling system:
1) Mud Pit
2) Submersible Slurry Pump
3) Mud Recycling System
4) Storage Tank
5) Outlet Pipe
6) Jet Mud Mixer.
GN Solids Control also offers submersible slurry pump, mud storage tank, as well as jet mud mixer per request.
GN is now on promoting this type economic mud recycling system, for more information, you may sent inquiry to sales@gnsolidscontrol.com

There is a cleaning Tank for GN500 GPM mud recycling system for Saudi Arabia HDD rig, the tank is divided into 3 compartment, 1# Shaker compartment, 2# De-sander compartment, 3# Mixing compartment.

Detailed process features of GN500 GPM mud recycling system for Saudi Arabia HDD rig

1) Continues feeding of dirty slurry from mud pit to Shale Shaker.

The GN100YZ100A-30 Submersible slurry pump feed slurry from mud pit to GNZS703E Shale Shaker at capacity of 528 GPM.Slurry pump is made from Cr26 Abrasion resistant Alloy which allow users to pump high solids content fluids.

GN500 GPM mud recycling system for HDD

GN500 GPM mud recycling system for HDD

2) Pre-screening of the returned mud using GNZS703E Shale Shaker for the GN500 GPM mud recycling system for Saudi Arabia HDD rig.

This shaker can handle a throughput of more than 528 USgpm and is designed to remove particles down to 250 microns(60mesh) @ 7G force linear motion GNZS703E Shale Shaker with big screen area (2.63 ㎡)

3) Secondary and third cleaning of the returned mud using a GNZJ703E (10″×1 + 4″ × 8) Mud Cleaner.

1# GNSB5×4A-13J Centrifugal pump feed mud from 1# Shaker compartment to feed 10″×1 de-sander cones, where the particles larger than 50 microns are separated out by centrifugal force from desander cone nipple, and get down to GNZJ703E mud cleaner bottom shaker with a finer screen (150/200mesh) which again produces a virtually dry product. Major fluids with particle size less then 50microns goes to 2# De-sander compartment. This is the 2nd phase solids control of the GN500 GPM mud recycling system for Saudi Arabia HDD rig.

2# GNSB5×4A-13J Centrifugal pump suck mud from 2# desander compartment and feed to 4″x8 desilter cones. Where the particles larger then 16microns are separated out by centrifugal force from desilter cone nipple, and get down to GNZJ703E mud cleaner bottom shaker with a finer screen, which again produces a virtually dry product. Major fluids with particle size less than 16 microns goes to 3# Mixing compartment. This is the 3rd phase solids control of the GN500 GPM mud recycling system for Saudi Arabia HDD rig.

4) Integral mixing system using GNSLS35A-300 Jet Mud mixer for GN500 GPM mud recycling system for Saudi Arabia HDD rig.

This GN500 GPM mud recycling system for Saudi Arabia HDD rig allows fresh mud to be prepared very rapidly from bentonite powder. One of the 2 pumps on tank end is dedicated to this function allowing continuous mixing or recirculation as required.

GN500 GPM mud recycling system for HDD

GN500 GPM mud recycling system for HDD

5) Integral charge pumps to supply clean mud back to the drilling rig.

The mixing pump above is a dual function pump, on mixing pump outlet with a T pipe can be controlled by a valve to provide a continuous supply of clean mud from 3# mixing compartment under pressure to the high pressure mud pump, avoiding problems of starvation and cavitations which can rapidly cause damage.

Low pressure / high pressure mud gun is used for mud tanks usually together with mud agitator. It is used as an assistant of mud agitator.

Drilling mud agitator usually mounted in the middle of the tank compartment to agitating mud and prevent it from settle down. But at corners of mud tank, agitator impeller cannot effect. In this case mud gun used.

high pressure low pressure mud gun

high pressure low pressure mud gun

Drilling fluids mud gun is mounted at the corner of tank. It has high pressure and low pressure for option. Some for international customer, sometime we will prefer 5000psi high pressure mud gun. It request a high standard of the seamless steel pipe feeding for the mud gun.

China supplier usually offer 1.6Mpa, 3.2Mpa and 6.4Mpa low pressure and high pressure mud gun. Parameters as below:

GN Mud Gun Technical Parameters






Working Pressure

≤6.4 Mpa

Rotation Degree



Nozzle Qty


Gun Diameter

2 Inch

3 Inch

Connection Size





Applications of mud gun

Drilling fluids mud gun can be powered by centrifuge pump, mostly mixing pump, it is called low pressure mud gun. Dud gun in rig system can also be powered by mud gun with high pressure. Mostly, only high pressure or low pressure will be used in one system, but in some mud system, customer will prefer both high pressure and lower pressure.

Sizing and model selection of mud gun

The number of mud gun depends on the size of tank. Usually mud gun installed with mud line of mud tank. According the inlet pipe size, there are 2’ mud gun and 3’ mud gun for option. According to different structure feature, there are two types of mud gun: fixed mud gun , and rotary mud gun.

The mud gun in the mud system can also be used for transfer mud from compartment to compartment, like for trip tank compartment.GN Mud Guns are available for rotation adjustment to allow the operator to optimize the mud guns performance. The replaceable wear resistant jet nozzle is used, which is special design with better shearing.