HDD means horizontal directional drilling or Directional boring, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore path by using a surface-launched drilling rig, with minimal impact on the surrounding area.

HDD fluids system

Drilling fluids have several important functions. They cool and lubricate the drill bit, stem and other down hole tools. The fluid also assists in sealing the sides of the bore, therefore stabilizing the borehole. Finally, drilling fluids are designed to carry the cuttings out of the hole.

The most widely used drilling fluids for HDD applications are bentonite, even if they are not so expensive compared with oilfield drilling fluids, but it is still a pollution for the environment, especially usually they dig a mud pit for HDD and pump the drilling fluids from the mud pit to shale shaker. After the directional boring, how to treat the used drilling mud become a problem.

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Mud agitator is mainly composed of electric motor, gear box and impeller shaft assy, for shaft- connection type mud agitator, it also have coupler. Elastic coupling connect electric motor input shaft and agitator gear box input shaft. Impeller shaft and agitator gear box output shaft are connected by rigid coupling.

agitator gear box

GN agitator gear box is worm gear reducer, which is combined with explosion-proof motor, enable stable performance in wild severe environment.

Rotation of the drive motor is transferred to the impeller shaft through the directly coupled gear drive. The drive is a reduction agitator gear box and is factory assembled to the drive motor. The drive is sized to apply the maximum torque required to produce the design impeller rotation speed of 60 rpm under 50hz, and 72 rpm under 60hz.

The mud agitator stirs a mud slurry to maintain suspension of solids. The agitator is mounted on top of the mud tank and has one or two impeller(s) immersed in the mud slurry. The impeller shaft is directly coupled to an electric drive motor that is available in several horsepower ratings from 7.5 to 25.

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Not only for drilling application( oil & gas drilling, HDD, geothermal, CBM, water well drilling), GN equipments can be also used for mining slurry separation, dredging slurry management, piling and tunneling.

Dredging and Dewatering equipments

GN dredging and dewatering equipments are designed to feed slurry directly from the dredge. GN dredging slurry separation system separates solids from dredging slurry through a three phase system.

In addition, the solids that are removed are dewatered to a stackable “press filter” state, which can be readily moved with front end loader, conveyor and/or dump trucks. The effluent is pumped off by a centrifugal pump.

The separation process is continuous and operates completely mechanically without any chemical enhancement. The dredging slurry separation system is designed as a three phase separation system, 1^st separation is shale shaker, 2^nd separation is desander, 3^rd separation is desilter. Sometimes as the client’s requirement, we only design 2 phase shale shaker and desander. The desander and desilter are made into separate mud cleaner with large screen area.

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GN solids control designed a standard mud system for mine slurry solids separation, which includes GNLW223 decanter centrifuge, GNZS752 shale shaker and a compact size mud tank, which is installed on top of the trailer. The total system capacity is 100L/min for the slurry.

Mine Slurry Solids Separation

Mineral exploration methods vary at different stages of the process depending on size of the area being explored, as well as the density and type of information sought. The most common drilling for mine is diamond drilling. Exploration diamond drilling is used in the mining industry to probe the contents of known ore deposits and potential sites.

GNLW223 mini decanter centrifuge specs:

If you require mine slurry solids separation system, pls contact GN sales.

What is dredging?

Dredging is an excavation activity or operation usually carried out at least partly underwater, in shallow seas or fresh water areas with the purpose of gathering up bottom sediments and disposing of them at a different location. This technique is often used to keep waterways navigable.

Dredging equipments in Colombia

What is dredger?

dredgers is a piece of equipment which can dig,transport and dump acertain amount of under water laying soil in a certain time.

In a dredging slurry separation project, dredge equipments include but not limit to dredger( dredge boat), dredge pumps, Flocculants mixing tower , slurry concentration tower, belt press filtration, sedimentation tank, dredging slurry separation system(DSS), etc. 

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The mud cleaning system produced by GN solids control is widely used for horizontal directional drilling , water welling drilling ,coal bed methane, geothermal hole and mining diamond core drilling , it is used to separate the drill cuttings from the mud, so that the clean mud can be re-circulated to continue the drilling process.

As the Geothermal drilling usually close or inside the downtown, this requires the mud system to be compact with less footprint and user friendly with less noisy. Also Geothermal well drilling sometimes require high capacity performance for deep wells. Below is the jobsite photo of mud cleaning system for geothermal drilling, which is produced and commissioning by GN solids control.              

Geothermal mud cleaning system

Like water well drilling, mud rotary drilling is also the desired method for installing geothermal loops. As the bit penetrates the soil, it creates smaller fragmented pieces that are called drill cuttings. The mud carries these cuttings to surface to create an open hole from the top down to the bottom. The drill cuttings are collected into a mud pan or settling pit on surface and then the mud is re-circulated to continue the drilling process.

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GN solids control design and manufacture linear motion shale shaker, and we produce shale shaker screens by our own factory. GN shaker screen factory Is located in the largest wire mesh center of Asia, we also supply replacement shale shaker screen for Swaco Mongoose( both in steel frame material and composite material) and Derrick FLC500 shale shaker, FLC2000 shale shaker.

shale shaker screens

By shaker screen frame, the screens type we can produce as

Hookstrip shale shaker screen, steel frame screen, composite material screen

By API mesh, we can produce from API40 to API 325. For special API mesh, pls confirm with GN. Our shale shaker screen is produced according to API RP13C.

By shale shaker brand & model, we can produce replacement shale shaker screens for

Derrick FLC500,FLC2000, Brandt Cobra, MI-SWACO Mongoose PT,BEM600, GN solids control, Kemtron, Fluids system, etc

By screen mesh layer, we usually supply shaker screens with 2 layers or 3 layers.

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Drill solids are the main contaminant of all drilling fluids and therefore their control is of the utmost importance. There are 3 main ways of controlling solids:

• Dilution

• Mechanical removal

• Gravity Settling

shale shaker for solids control

I ever saw in the water well drilling site in Mongolia that they do not use any solids control equipments but only dig several mud pits, by this way, it is very low efficiency and Environmental Pollution.

Solids control system is a way for mechanical removal the drill solids. Mainly it includes screen devices & Centrifugal Separation Devices. Screen devices is the most important equipment called shale shaker. In the future of solids control system, shale shaker will become the only solids control equipment which will be used instead of desander, desilter, mud cleaner, decanter centrifuge by improvement of its design. At present, linear motion shale shaker is the most popular vibration mode shale shaker.

But the arrangement of vibration motor various by different shale shaker manufacturer. Sometimes it is vertical installed, sometimes it is horizontal installed, it doesnot mean that horizontal installed shale shaker must be balanced elliptical motion shale shaker, it might be linear motion shaker.

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As a part of rig package, mud system is a separate but an essential part, the handling of drilling fluids can save huge cost of drilling. In the early oil industry open earthen pits were used as settling area to separate solids and mud thereby acting as a solids control equipment.

mud system for a rig

Now, with the stringent environmental regulations and high mud costs, the economics of an effective mud system come into consideration. Different solids control companies introduce zero-discharge systems, closed-loop systems, “quick move” technology, screening technology, disposal options etc. No reserve-mud pit is used in a truly closed mud system. Mud is continually processed primarily by mechanical means, such as screening, hydrocyclone and centrifuging to remove solids initially. A second stage to remove colloidal solids is by wastewater cleanup techniques.

Major components of a mud system, including:

Mud gas separator, flare ignition device

Shale shaker, mud cleaner(or desander, desilter), vacuum degasser, decanter centrifuge , centrifugal pump, mud hopper,  mud agitator, mud gun, mud tank and others, such as cutting dryer, screw auger, mud cooling unit,etc.

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GNZYQ1000 mud gas separator is capable of handling 1000~1400gpm drilling fluids. We have 6 units of mud gas separator in stock which are all ready for shipment with painting &　package, welcome to contact with our sales. Except for mud gas separator, we also have flare ignition device in stock, which usually worked together with mud gas separator for oilfield. Mud gas separator is used to separate the harmful gas from the drilling mud, then flare ignition device is used to connect to the gas discharge line of mud gas separator, and burned it , they work together to avoid “kick” situation.

According to base type , the mud gas separator can be divided into :

mud gas separator

• Fixed type
• Elevating type

According to the bracket type, it can be divided into horizontal type and vertical type. Most of Chinese mud gas separator is vertical installed, when you need to transport it, you can lay it down , and there is lifting pad hotizontally. MI-SWACO mud gas separator is horizontal type with a skid, it is for simplifies transport, spotting and installation. Unit can lay down during over-the-road transport

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