In drilling mud purification system, vacuum degasser is widely used. Through
the compulsory measures, separating gas from drilling mud, thus ensuring
drilling mud good performance. Drilling mud vacuum tank degasser is one type of
degasser in oil & gas drilling fluids solids
control system.
Vacuum degasser can also be named drilling fluids degasser to mainly get rid
of various gas of invasive drilling quickly. It is very important for returning
mud gravity, stabilizing mud viscosity and reducing drilling cost.
Drilling fluids vaccum degasser is used to remove the small entrained gas
bubbles left in the mud by the mud/gas
separator. As the second-stage solids control equipment for oilfield
drilling fluids, vacuum degasser actually is used to remove little invaded gas
in drilling mud. It will be set between shale
shaker and mud cleaner/desander.
Operational Theory:
Vacuum degasser utilizes negative pressure by vacuum pump to withdraw
entrained gases from the mud. In order for this to work, mud is pumped through a
venturi, which develops a negative pressure in the vessel by vacuum pump, thus
sucking mud into the unit. The choice between horizontally- or
vertically-mounted units is typically based on the footprint requirements of the
specific rig.
KOSUN Vacuum Degasser can quickly remove all kinds of entrained gas from the
fluids. It is indispensable equipment in gas wells, prospect wells and deep
wells. It is also used with various kinds of clean circulating systems for
drilling. The gas/fluid separation structure of the degasser is well-designed.
It can ensure efficient separation and can filter raffles in order to make sure
the smooth of the blast pipe. This employs a water ring vacuum style degasser,
and is used for degassing combustible gas and explosive gas.
2015年9月20日星期日
Mud tank in offshore drilling solids control system
The body of the mud
tank is made by welding the steel plate and section, using the smooth
cone-shape structure or the corrugated structure. The mud tank surface and
passages are made of slip resistant steel plate and expanded steel plate. The
mud tanks are made of the side steel pipe, all of the structure can be folded
without barrier and pegged reliably. The surface of the tank is equipped with a
water pipeline for cleaning the surface and equipment on the tank, it uses
soaked zinc processing for the expanded steel plate. The ladder is made of
channel steel to take responsibility the body, the foot board is made of
expanded steel plate. The two-sided guard rail are installed the safe suspension
hook. The mud tank is designed the standard shanty to prevent the sand and the
rain. The pipeline is installed in the tank to preserve the warm air heat.
The tanks are generally open-top and have walkways on top to allow a worker to traverse and inspect the level of fluids in the tanks. The walkways also allow access to other equipments that are mounted on the top. Recently, offshore drilling rigs have closed-in tanks for safety. The mud tank plays a critical role in mechanically removing destructive solids and sediment from costly land and offshore drilling solids control system.
A tank is sectioned off into different compartments. A compartment may include a settling tank, sometimes called a sand trap, to allow sand and other solids in the drilling fluid to precipitate before it flows into the next compartment.
Other compartments may have agitators on the top, which have long impellers below inserting into the tank and stirring the fluids to prevent its contents from precipitating. And mud guns are often equipped at the corners of the tanks' top, spraying high-pressed mud to prevent the drilling fluids in the corner of the compartment from precipitating, typically for the square tanks.
The pipe work linking the mud tanks/pits with the mud pumps is called the suction line. This may be gravity fed or charged by centrifugal pumps to provide additional volumetric efficiency to the mud pumps.
The tanks are generally open-top and have walkways on top to allow a worker to traverse and inspect the level of fluids in the tanks. The walkways also allow access to other equipments that are mounted on the top. Recently, offshore drilling rigs have closed-in tanks for safety. The mud tank plays a critical role in mechanically removing destructive solids and sediment from costly land and offshore drilling solids control system.
A tank is sectioned off into different compartments. A compartment may include a settling tank, sometimes called a sand trap, to allow sand and other solids in the drilling fluid to precipitate before it flows into the next compartment.
Other compartments may have agitators on the top, which have long impellers below inserting into the tank and stirring the fluids to prevent its contents from precipitating. And mud guns are often equipped at the corners of the tanks' top, spraying high-pressed mud to prevent the drilling fluids in the corner of the compartment from precipitating, typically for the square tanks.
The pipe work linking the mud tanks/pits with the mud pumps is called the suction line. This may be gravity fed or charged by centrifugal pumps to provide additional volumetric efficiency to the mud pumps.
Decanter centrifuge for wastewater treatment industry
Municipal and industrial wastewater treatment plants are designed to produce
a clean, safe water discharge within the required limits. The complexity of the
plant will depend on the immediate environmental considerations and the consent
limits negotiated with the authorities. New plants built today are becoming more
and more sophisticated and decanter centrifuges are extensively used for
liquid-solid separation（also called solids
control）, sludge dewatering, and sludge thickening applications.
For the purposes of typical decanter centrifuge, we will consider only the basics. There are basically two decanter centrifuge applications in the municipal and industrial wastewater treatment facilities and wastewater treatment industry:
The first is to feed to the decanter centrifuge liquid slurry (around 1 – 3 % dws.) and thicken it to approximately 8% dws, often prior to feeding the thickened material to a biological digester.
The second is to feed the decanter with similar slurry and dewater the solids to a relatively dry stackable cake of leach free solids prior to transportation or disposal. In the second case the solids can come from the primary clarifier or the secondary clarifier after biological treatment.
A simplified and typical flow-chart for wastewater applications is shown below although not all process steps are present, particularly for industrial wastewater.
The range of decanter centrifuges is ideally designed for these applications. Controlling the decanter centrifuge operating parameters optimizes the consistency of the discharged sludge.
Sludge discharge consistency can be regulated to suit the disposal requirements. Slurry for land application should be thickened to reduce the volume of water but still needs to be fluid enough to be easily spread or evenly pumped for land application. Digester feed slurry can often be thicker but typically requires a pump-able sludge. When the discharged sludge will be disposed of via landfill, dewatering the feed slurry to a stackable consistency reduces weight, volume and disposal costs.
For the purposes of typical decanter centrifuge, we will consider only the basics. There are basically two decanter centrifuge applications in the municipal and industrial wastewater treatment facilities and wastewater treatment industry:
The first is to feed to the decanter centrifuge liquid slurry (around 1 – 3 % dws.) and thicken it to approximately 8% dws, often prior to feeding the thickened material to a biological digester.
The second is to feed the decanter with similar slurry and dewater the solids to a relatively dry stackable cake of leach free solids prior to transportation or disposal. In the second case the solids can come from the primary clarifier or the secondary clarifier after biological treatment.
A simplified and typical flow-chart for wastewater applications is shown below although not all process steps are present, particularly for industrial wastewater.
The range of decanter centrifuges is ideally designed for these applications. Controlling the decanter centrifuge operating parameters optimizes the consistency of the discharged sludge.
Sludge discharge consistency can be regulated to suit the disposal requirements. Slurry for land application should be thickened to reduce the volume of water but still needs to be fluid enough to be easily spread or evenly pumped for land application. Digester feed slurry can often be thicker but typically requires a pump-able sludge. When the discharged sludge will be disposed of via landfill, dewatering the feed slurry to a stackable consistency reduces weight, volume and disposal costs.
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