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The Screw conveyors is a simple and popular transfer device at oil and gas drilling field. As it is a rotating device, and at many job site, the top covers of screw conveyor augers are gratings, it caused some unexpected accidence.

One time, a clients contacted GN Solids Control to ask for support. He said they experienced by HSE issues at their rigs sides which were caused by screw conveyors. He said in the past year, some operators hurt their finger or foot by screw conveyors. It caused jobsite shot down.

They want know what safety protection GN Solids Control provide on the screw conveyors.

Firstly, GN Solids Control offers Full Length Safety Grab Wires and ESD Devices (emergency stop device) on start stop panels. Operators can easily stop the augers at any position nearby it.

Clients can choose Fixed speed motor starter or manual adjustable speed motor starter per order request. The control panel is capable for operating in +55 °C Ambient Temps.

All Electrical equipment and electrical accessories for the auger system is designed and certified for Hazardous Area with ground protection.

The auger motors and motor starter can be accordance with explosion proof standard for CNEX, IECEx or ATEX Zone 1 and Zone 2 Rated and suits for 460V/60HZ 3 Phase, 380V/HZ 3 Phase, or suits for customized power system. Clients confirm voltage and HZ before order.

GN Solids Control can provide motor starter with Emergency STOP Switches located Near the Augers. As an additional safety protection, GN Solids Control is capable to provide Audio / visual alarm system connected to the auger motor starters and located near the augers. The motor start equipped with Audio and visual alarm system will be automatically activated once the power is switched on followed by the actual auger startup with a safety delay time. And plus, the Audio and Visual Alarm to be in the OFF mode after some time once the auger starts operation. It is for giving ATTENSION to stuff nearby to let them aware about the start up of the screw conveyor, and ensure them have time to keep distance from the rotating device.

Vertical cuttings dryer is also called as vertical centrifuge. It is driven by motor and gearbox. The high rotating speed will generate high G force and therefor to separate the liquid and solids phase.

GNCD930G-GP is a fixed speed vertical cuttings dryer. The power is from a single ex-proof motor driving system. The motor drive the main pulley, the main pulley drive the gearbox housing via V belt, the gearbox drive the bell jar combination and screen basket assembly. Fix the gearbox input shaft, to make the gearbox output shaft speed little lower than gearbox housing speed, to drive the rotor assembly in a speed which is slower than screen basket assembly rotation speed. Thus, screen basket assembly and rotor assembly form same rotation direction separation machine with proper differential speed.

The power of GNCD930G-VFD VFD vertical cuttings dryer is from a dual ex-proof motor driving system. It is a variable speed dryer. The motor drive the main pulley, the main pulley drive the gearbox housing via V belt, the gearbox drive the bell jar combination and screen basket assembly. The auxiliary motor is a flameproof motor. The input shaft is driven by the V-belt through the main pulley, so that the power is converted inside the differential to produce a speed slightly lower than that of the gearbox housing on the output shaft, thereby driving the rotor assembly to a slightly lower speed. Rotating at a speed lower than that of the screen basket assembly. In this way, the screen basket assembly and the rotor total constitute a separation-discharge mechanism with a certain differential speed and high-speed rotation in the same direction. The main and auxiliary motors are controlled by the frequency converter to obtain different speeds and differential speeds. Realize the separation of different materials.

Besides vertical cuttings dryer, GN Solids Control is also capacity to make all major Drilling Waste Management for the liquid and solids separation, like Vertical Cuttings Dryer, HI-G Dryer Shaker, Decanter Centrifuge, Screw Pumps, screw conveyor, etc.

Centrifuge is a kind of mechanical separation equipment that uses centrifugal force to separate the components in the mixture of liquid and solid particles, or liquid and liquid. The centrifuge is mainly used to separate the solid particles in the suspension from the liquid, or to separate two kinds of liquids in the emulsion with different densities and immiscible with each other (such as the 3 phase decanter centrifuge or disc centrifuge used in GN oil sludge treatment system, it is to separate oil and water from the oily slurry). Centrifuges can also be used to remove liquids from wet solids, like for waste water decantering treatment.

There is also centrifuge which can classify solid particles according to density or particle size by using the characteristics of different settling velocity of solid particles with different density or particle size in liquid. It is decanter centrifuge. Decanter centrifuge is the most popular centrifuge type for oil and gas drilling field. The most popular size is 14 inch bowl and 18 inch and 22 inch big bowl decanter centrifuge.

This week, GN Solids Control finished some high speed decanter centrifuge, the centrifuges will be used for low gravity drilling mud processing. GN Solids Control can also make middle speed centrifuge for high gravity mud processing. The higher speed of the centrifuge, the high requirement on the manufacturers capability. GN Solids Control makes high speed and big bowl decanter centrifuges from the small size 9 inch to the largest size 30 inch.

Besides making high speed centrifuge for low gravity solids (LGS) separation, and low speed centrifuge or high gravity separation (HGS), GN Solids Control is also capacity to make VFD centrifuge and FHD centrifuge, which with adjustable speed, can be used for both low gravity solids (LGS) separation and high gravity separation (HGS). And also the VFD and FHD centrifuge is widely used for drilling waste and other industry waste application.

GN Solids Control Mud Gas Separator is located after BOP choke manifold and before the mud enter into the drilling mud processing system. After the BOP and choke manifold., for continued drilling in underbalanced conditions where dramatic pressure surges are normal. It is always used comply with a igniter.

GN Solids Control Mud Gas Separator adopt dump gate on the bottom to control the fluids height, and no sediment.
The liquid impingement tubes are cylindrical which extends the equipment life. The main part of the equipment adopt anti H2S material and the surface is processed. This can totally avoid H2S damage.

GN Solids Control Mud Gas Separator can be equipped on a big shipping skip for easy movement, and while the mud gas separator is rigged up, the free space can be used to allocate choke manifolds.

GN Solids Control flare ignition device is used for connecting to the gas Vent line of Mud Gas Separator to burn the dangerous gas from the drilling mud like H2S. The upper part of the flare ignition system is stainless steel, and it is designed for rain proof in the oilfield. The major components for the electrics are from famous Brand like SIEMENS or Schneider. The power for the electric can be directly from industry normal power, or users can charge the battery and take the unit for remote areas application. GN flare device is with remote control, and PLC is optional available for less manpower notice for continually and automatically working..

GN Solids Control is specialized in full package drilling mud system. Unlike other solids control manufacturer, who only self-make a part of solids control equipment, GN Solids Control makes all the drilling mud solids control equipment by himself. After degasser, GN Solids Control makes solids control equipment to process the drilling mud, like 3-panel shale shaker and 4-panel shale shaker, mud cleaner, desander and desilter, vacuum degasser, and decanter centrifuge. GN Solids Control make other accessory equipment to complete the processing, like mud agitator, centrifugal pump, slurry pump, screw conveyor, etc…

GN Solids Control make vacuum degasser and centrifugal degasser to suit for various sizes drilling rig solids control system. Mostly, clients use the degasser unit after shale shaker and before mud cleaner separator. Most vacuum degasser should be used together with a centrifugal pump for feeding. GN Solids Control vacuum degasser is self-suction type. It is generate vacuum and suck drilling mud automatically. It can save a pump and save power.

The correct installation of drilling mud vacuum degasser should be at the suction tank. It is the first tank downstream of the sand trap, or when there is no sand trap, it is the first sand trap. The sand trap should be constantly stirred to help the drilling fluid tumble and separate as much gas as possible from the drilling fluid.

The treated drilling fluid then flows into the next circulating tank. There should be a welded pipe or overflow port that can withstand high flow rate between the two pools. The discharge tank of the degassing device is also the suction tank of the centrifugal pump. The centrifugal pump here is used to pump the drilling fluid from the ejector of the degassing device. At this time, the drilling fluid is usually called dynamic drilling fluid.

Pumping the drilling fluid from the ejector is actually sending the drilling fluid from the suction pool of the degassing device to the unloading pipeline. Design and equipment installation due to Bernoulli effect, a low-pressure area is formed at the ejector, so that the discharge from the ejector returns to the same container. It is used as the suction of power well fluid. The drilling fluid is sucked into the vacuum degasser, and then passes through the degassing container. The reason is that the centrifugal pump cannot pump out the drilling fluid containing gas. Therefore, the drilling fluid cannot be pumped out of this container, but can only be inhaled.

GN Solids Control is now working on the packing of a 1500GPM drilling mud cleaner for a drilling company in China. The drilling mud cleaner model is GNZJ594F-3S16N. It is a combo type 3-in-1 mud cleaner, which is composed of a single deck 4-panel shale shaker, number 3 desander cones, and number 16 desilter cones. The desander cone size is 10 inch, cut point of the 10 inch desander cone is 47 microns. The desilter cone size is 4 inch, cut point of the 4 inch desilter cone is 27 microns.

The 3-in-1 mud cleaner is for 2 steps solids control separation. Shale shakers are used before the mud cleaner. For 1500GPM mud cleaner, qty 3 shale shakers are recommended before the mud cleaner. After the dirty drilling mud pre-separated by the first stage solids control shale shaker, the recovered drilling mud will be transferred to desander separator and than fed to desilter separator for the 2 steps separation.

According to the vibration type, the shale shakers can be divided into 4 types:

1. Ordinary elliptical motion shale shaker: during operation, the screen box moves in a circular track and makes a pitching motion around the center of mass.

2. Circular motion shale shaker: the screen box moves in a circular track during operation.

3. Linear motion shale shaker: the screen box moves in a straight track during operation.

4. Translational elliptical vibrating screen: during working, the screen box moves in a translational elliptical track.

GN Solids Control makes linear motion shale shaker and dual motion shale shaker. Beside shale shaker and mud cleaner, GN Solids Control can make other drilling mud treatment equipment as well as drilling waste management equipment, like vacuum degasser, decanter centrifuge, mud gas separator, mud agitator, mud gun, centrifugal pump, screw pump, screw conveyor, sludge and solids transfer vacuum pump, high G drying shaker, vertical cuttings dryer, etc…

Dewatering unit is widely used together with high speed decanter centrifuge for dewatering treatment. They are used to remove the untra fine solids inside the liquid mixture.

As the decanter centrifuge is a physical separation equipment. It can only separate solids and solids by gravity with centrifugal force. The centrifuge cut point is 2 microns. If there are ultra fine solids inside the liquid which is less than 2 miscrons, centrifuge itself cannot remove it. In this situation, chemical dosing unit will be used.

GN Solids Control provide various types of chemical dosing unit for dewatering treatment. Clients should choose the suitable chemical dosing dewatering unit based on their job site situation and their project demands.
How to choose the right model Dewatering unit?

1) First, clients need to confirm do they need explosion proof, or non-explosion proof is accepted for safety areas.

2) Secondly, clients need to confirm what is the voltage and frequency they need, normally, there is 380V/50HZ, 460V/60HZ. Other voltage and HZ, like 415V, 480V are also normally used.

3) Thirdly, clients need to confirm what is the dosing capacity they need to use to suit for their centrifuge capacity.

4) And then, clients need to confirm will they use powder chemicals or liquid chemical, or both. As the design is different. Powder chemicals need to be protected from moisture. Containerized type chemical dosing unit is normally used for powder chemicals. In order to make the container suitable for operators, air conditioner is optional to equip for the container. Liquid chemical is relative easy. Skid mounted PE barrels are normally used liquid chemicals.

There are fixed speed control centrifuge, VFD centrifuge, and FHD centrifuge. VFD centrifuge is the most popular used together with chemical dosing unit to dewatering treatment. 14 inch decanter centrifuge, 18 inch decanter centrifuge and 22 inch decanter centrifuge are the most popular used for dewatering treatment. GN Solids Control is also capable to make baby size centrifuge 9 inch, and huge size centrifuge 30 inch.

During the construction of TBM and Pipe Jacking activities, the dirty slurry coming out from the hole will contain a large quantity of sand and stones. In order to protect environment and recycle the water, it is necessary to treat the dirty mud. GN Solids Control is a professional manufacturer to design and make complete set of slurry separation plant. GN Solids Control can make various sizes slurry separation plant to suit for different job site situation.

This week, a set of GNTBM-240 TBM Slurry Separation Plant is ready. The unit is made for a South America client.
The handling capacity of the GNTBM-240 slurry separation plant is 240m3/h. The cut point of the separation plant is 20 microns. The GNTBM-240 TBM Slurry Separation Plant contains a shale shaker, desander separator, desilter mud cleaner, bottom drying shaker, feed pump and mud tank. The shale shaker is a double deck shale shaker with totally 5 screens. The desander cone contains Qty 1 × 20 inch hydra cyclones. It is combined with the coarse separation double deck shale shaker. The desilter cleaner contains Qty 12 × 4 inch hydra cyclones. It is mounted on a 2-panel shale shale shaker to use as a combo type shale shaker.

Feeding pump for GNTBM-240 slurry separation plant heavy duty slurry pump. Totally 2 slurry pumps are used in the separation plant to feed for desander cone and desilter cones. Clients can use another heavy duty slurry pump to feed for the whole GNTBM-240 slurry separation plant.

Total power of the GNTBM-240 slurry separation plant is 116Kw. GN Solids Control offers electrical control system to offer clients turn key solution.

The GNTBM-240 slurry separation plant is designed for easy transportation. Operation dimension of the system is L6058×W3081×H4316. Inland shipment of the GNTBM-240 slurry separation plant is L6058×W2438×H2591.

GN Solids Control makes Solids and Sludge vacuum pump to suck and transfer various types of waste material. It is popular to use before GN oil sludge treatment system to suck the oil sludge from the waste pit and feed to the separation system.
Some client want the vacuum pump is strong enough to suck thick sludge.

It is no problem to use GN sludge vacuum pump suck the upper layer oil sludge in the pit. On the upper layer, the liquid content is higher, the sludge is flow. So vacuum pump can suck it. At the bottom, the solids content maybe much high. If the fluidity is poor or unable to flow, the vacuum cannot be sucked.

It is difficult to confirm slush up to what solids content can be evacuated. It also depends on the viscosity and density.
Clients are normally suck it in 2 ways.

1) vacuum pump to suck the liquid sludge at upper layer, and separated by shale shaker, centrifuge, etc… The liquid recovered is dirty. They transfer the dirty liquid to waste pit to dilute the bottom solids waste.

2) they use vacuum pump to suck the liquid sludge at upper layer, use excavator to take the bottom solids, or they use the excavator machine for all the sludge waste.

This video is showing clients use both vacuum pump and excavator machine to suck the sludge and waste.
https://www.gnsolidscontrol.com/video/oil-slurry-and-sludge-treatment-project-in-qinghai-oilfield

This video is showing clients use excavator machine to suck the sludge and waste.
https://www.gnsolidscontrol.com/video/vertical-cuttings-dryer-for-oil-based-drilling-waste-in-ghana.html

Another purpose of clients using GN Solids Control vacuum pump is to remove slush from Skips and drop in a pit. They are collecting the oil slurry in skips and taking them to our site for treatment and disposal. At the site we remove slurry from Skips, and treat them in TDU

Mixing unit is widely used for trenchless machine and trenchless rigs, like for  pipe injection, tunneling or micro tunneling, etc…

Depends on the kind and size of the trenchless machine and limitation of the job sites, various sizes of mixing tank and various capacity of mixing units are equipped to suit for the trenchless activities.

Centrifugal pump is widely used at drilling mud mixing unit. It can be used as water pump, mixing pump, or transfer pump. Mixing tank and transfer pump is the most popular used for drilling mud tank unit.

Some mixing tank unit use 1 centrifugal pump, while some drilling mud mixing unit are equipped with 2 centrifugal pumps. The 1 centrifugal pump mixing unit also have the function of mixing and transfer. The cost of 1 centrifugal pump unit is surely lower than 2 centrifugal pump units. Why there are some clients prefer 1 mixing pump unit, while some clients prefer 2 centrifugal pumps unit. What is the major difference of the 2 proposals?

In the 1 centrifugal pump unit, the mixing pump can be used as transfer pump as well. There will be a T-pipe equipped at the outlet of the mixing pump. In this case, the mixing pump is also transfer pump. But in this conditions, mixing and transfer function cannot be used at the same time. While the pump used for mixing, the transfer must be stopped. While the pump used for transfer, mixing must be stopped. The shift of transfer and mixing can be switched by operators, or controlled by level meters or sensors.

In the mixing tank unit with 2 centrifugal pumps, a pump used for mixing, another pump is used as transfer pump. There is a separate transfer pump in the system. Some clients prefer a separate transfer pump, although their cost will be higher compared with single pump mixing tank unit. But in this conditions, the clients can use the other tank as backup pump. The mixing unit can mix mud and transfer mud at the same time. There is level gauge for high level transfer and lower level mixing.