Category Archives: Vacuum Degasser

During the production process, a product’s metal components can become infused with excess amounts of gases. As a result, unwanted imperfections and side effects can impact the integrity or performance of the metal.

Vacuum degassing processes involve the exposure of molten steel to a low-pressure environment to remove gases (chiefly hydrogen and oxygen). The effectiveness of any vacuum degassing operation depends upon the surface area of liquid metal that is exposed to low pressure. This process is typically performed in a specially designed chamber known as a vacuum degasser.

vacuum degasser

The reduced pressure inside the vessel or chamber causes the gas to become less soluble and separate from the liquefied material. After the vacuum degassing process is complete, the gas is removed from the vessel, and the pressure is returned to normal.

Vacuum degassing to remove carbon not only reduces imperfections, but also makes metals more ductile, or easily shaped and formed through cold metalworking.

Vacuum Degasser is adapted to get rid of various cut-in gases in the drilling fluids. Vacuum degasser is very important for returning mud gravity, stabilizing mud viscosity and reducing drilling cost.

Gasses can be released from the fluid and removed from the installation in two ways:

1. Thermal degassing
Because of temperature differences in an installation, dissolved gasses are released automatically. By means of so called in line deaerators, the released gasses can be removed from the fluid.  Spirotech offers various solutions for this.

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2. Vacuum degassing
In case of vacuum degassing part of the installation fluid is temporarily put in an underpressure (vacuum) condition. The gasses dissolved in the fluid are released, separated and removed from the installation. The degassed, absorptive, fluid is returned into the installation and can absorb any present free gasses again. By repeating this process continuously almost all gasses will be released and removed. The fluid will now be undersaturated to such an extent, that no gasses will bereleased anywhere in the installation, so the problems mentioned before will not occur. Problems in places with a low flow velocity and a low overpressure are also solved in this way.

vacuum degasser

When to apply a vacuum degasser?

• When an installation contains many branches, with a low flow velocity. In this case, the free, accumulated gasses will hardly be carried away with the flow, but will
disappear slowly thanks to the fluid being made absorptive.

• In case of small temperature differences only a small amount of gas is released by the heating or cooling process, which can be removed by an in line deaerator. A vacuum degasser works independent of the fluid temperature.

• When an in line deaerator cannot be mounted for practical reasons. A vacuum degasser can be mounted at almost any place in an installation.

Vacuum degasser can wipe off the invaded gas from drilling mud quickly, restore drilling mud proportion, keep mud viscosity performance and improve the quality of drilling fluid.

Vacuum degasser is very important for returning mud gravity, stabilizing mud viscosity and reducing drilling cost. Therefore, it works as one type mud cleaning equipment. As it is placed after the shale shaker, so we call it second stage mud cleaning equipment in mud recycling system.

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Application of vacuum degasser

Gases are entrained in drilling fluids from the wellbore during normal drilling operation as well as during “kick” or well control situations, these gases may bring safety hazards and create operational problems, in case of the presence of hazardous gases, it is desirable to localize the point where gas is released from the mud by installing a vacuum degasser.

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Vacuum Degasser Features

Self contained degasser unit operation without feeding pump.
Technical and spare parts support in many countries.
Liquid Level Sensor for safty operation.
Short footprint make it possible to be installed in smaller space.
Eliminate corrosion and reduce reparation and maintenance costs.

You are welcome to contact with us to get more detailed infos, we will supply cost-effective vacuum degasser and satisfactory pre-sale, sale and after-sale technical services.

Vacuum Degasser are used to remove the small entrained gas bubbles left in the mud by the mud/gas separator. These units are positioned downstream from mud/gas separators, shale shakers and mud cleaners, while hydrocyclones and centrifuges follow in the arrangement.

Working principle of vacuum degasser

The degassers are used to clean the gas in the drilling fluid, to ensure the drilling fluid property relatively stable, to guarantee the steady operation of swirlers. The degassers can be grouped into two kinds: ordinary pressure type and vacuum type. The ordinary pressure degasser is to use the centrifugal to take out gas to invade the mud, with the help of centrifugal force to make the mud spraying in the jet tanks and striking on the wall to make gas releasing. The vacuum degasser is to use the suction of the centrifugal, forming negative pressure in the vacuum tanks, under the action of drilling fluid at atmospheric pressure, through the suction pipe into the hollow shaft, then by umbrella piece of around the hollow shaft assembly, they jet to the skin of tank.

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Structure of vacuum degasser

ZCQ vertical type vacuum degasser made of explosion proof motor, vacuum pump, coaxial shunting gear reducer. When works, pressuring the start key, motor drive vacuum pump and mud gas separator degassing impeller rotate, gas cut invaded drilling fluid absorbed to mud gas separator and throw to mud gas separator by degassing impeller. Production a fluid lamina which is eddy spiral movement and form the centrifugal force field. Because the centrifugal force is the 32 times of its gravity, make the small bubbles in fluid lamina rapidly buoyancy lift to surface, in the function of negative pressure, the small bubbles rapidly broken, the broken bubbles gas enter into vacuum pump and discharged through the two air holes in reducer.

DC Solid Control is a total solids solutions provider. We offer industry leading solids control equipment including shale shakers, degassers, mud cleaners, deserter, desander and centrifuge. They are a complete circulating of mud systems.

vacuum degasserVacuum degasser use atmosphere and vacuum degassing theory eliminate the remaining gas in drilling fluid to ensure the drilling fluid property relatively stable, to guarantee the steady operation of swirlers. The degassers can be grouped into two kinds: ordinary pressure type and vacuum type.. Vacuum degasser tank is installed a group of wave blade and many mud inlet make flow is uniform distribution and form into turbulence in tank.

The vacuum degasser always set behind shale shaker. The internal impellers will mix the drilling fluid and break the bubble. It is a special-purpose device and a new type one for the treatment of gas in the drilling fluids. It can get rid of various gas of invasive drilling quickly. Vacuum degasser is very important for returning mud gravity, stabilizing mud viscosity and reducing drilling cost.

Features & Benefits

Skid-Mounted – Simplifies spotting and installation.
Self-Contained – The unit consists of a cylindrical vacuum tank with internal baffle system, vacuum pump, jet nozzle and three-way float valve.
Three-Way Float Valve – Unique design allows venting to the flare line during hydrogen sulfide service.
High Performance – The D-GASSER can handle up to 1,000 gpm while restoring mud to its original density.
Robust – The unit is ruggedly built and is coated inside and out with a corrosion-resistant epoxy to ensure long life and minimum maintenance.

The majority manufacturer in China are focus on oil drilling mud system is DC professional drilling solid control manufacturer,  it has a very important role for oilfield , mud mixing system and other industry. Any interest please contact us for inquiry.

Vacuum degasser is the second stage solid control equipment, which is used when drill above 3000m well, so it is very important for drilling. And how to install it and what hidden dangers it has, please continue to look down.

Common hidden dangers in installing a vacuum degasser;

(1). The degasser is not connected with a flare line pipe, or the pipe is not at least 15m from the mud tank area.

(2). The relief pipe of the degasser shrinks in diameter ot is bent, so that the gas is not delivered smoothly.

(3). The relief pipe of the degasser is upright, releasing gas above the mud tank area.

vacuum degasser

1. Hazard:
The degasser is not installed with a relief pipe, pr the pipe connected outside the tank is less than 15m away. The gas discharged will accumulate in the tank area, casuing danger of explosion.

Remedy:
The relief pipe of the degasser is connected 15m beyond the tank area. The flammable pernicious gases can be ignited at the wellhead if necessary, the 15m relief pipe is connected beyond 15m when the degasser is used.

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2. Harden:
If the relief pipe of the degasser has a reduced diameter or is bent, it decreases the efficiency of removing gases.

Remedy:
The inside diameter of the relief pipe of the degasser should not be less than the open diameter of the outlet, and should open toward the road ahead. If the hose is used, it should not be deformed due to compression; a right angle bent should be used to turn a corner.

3. Hazard:
The relief pipe discharge directly above the tank area. Because the outlet of the pipe is about 3m above the surface of the tank, permicious gases cannot be ignited and set on fire. Inflammable pernicious gases will accumulate around the tank area.

Remedy:
The relief pipe of the degasser is connected 15m beyond the tank area. Inflammable pernicious gases can burn at the outlet when released.

Vacuum degasser is a high-efficiency in-line module that removes dissolved gases from HPlC Solvents. Its unique design assures reliable continuous operation and the highest level of continuous performance available without the need for helium degassing. Up to five solvent lines maybe degassed simultaneously by one unit. This type of equipment is part of the final polishing stage of a water treatment process to produce ultra high purity water.

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How to works of vacuum degasser

Vacuum degasser work by creating lower pressure inside a vessel so air or other gaseous impurities can be removed from a substance, such as water or even molten steel. The air is siphoned from the vessel after pressure is lowered enough to force the gas from the substance. A high-vacuum process environment is maintained for a variety of product testing and laboratory application.

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Features of vacuum degasser

1.Negative pressure degasser can efficiently separate gas and liquid, filter out impurities and ensure smooth exhaust;
2.During the working process of water ring vacuum pump, it always stays in isothermal condition, which is suitable for the suction of flammable and explosive gas and the performance is safe and reliable;
3.Drilling mud hit the wall through the window of a rotor at a high speed, bubbles in the mud broken thoroughly, the degassing efficiency is high and more than 95%.
4.The application of gas water separator will not make the water and gas discharged simultaneously and the discharge pipe is always clear.

Vacuum degasser are positioned downstream from mud/gas separators, gumbo removal equipments (if utilized), shale shakers and mud conditioners (if utilized), while hydrocyclone desander and Decanting centrifuges follow in the arrangement.

A vessel into which drilling mud is pumped to remove gas entrained in the drilling mud. Modern, compact degassers use three commonly recognized methods of degassification: centrifugal force, turbulence, and vacuum, See degassing drilling Mud.

Degassing drilling mud

An important part of well-drilling operations is keeping the drilling mud free of entrained gas, or bubbles that enter the mud as it circulates downhole throgh gaseous formations. One of the three functions of mud is to provide sufficient hydrostatic head to control a kick when high-pressure oil or gas is encountered.

SONY DSC

Vacuum Degasser Working theory:

When mud of a certain density is circulated, it can become infused with gas to an extent that, although the volume of mud may increase, the density is severely reduced. To guard against this dangerous situation, the mus is degassed at the surface. Several kinds of equipment get the gas out, but all have one aim in common: to make it possible for the gas bubbles to free themselves.

vacuum degasser

 

One method flows the mud over wide sheets so the slurry is no more than one-eight to three-eights thick and the bubbles may come to the surface and escape. Another method sprays the mud against a baffle in a spray tank that squeezes out the gas. A third method directs the mud through a vacuum tank where, under reduced atmospheric pressure, the bubbles of gas expand and break out of the slurry.

You are welcome to contact us to get more detailed infos, we will supply cost-effective vacuum degasser and satisfactory pre-sale, sale and after-sale technical services.

Working principle of DC vacuum degasser

The vacuum degasser uses the suction of the vacuum pump to establish an under balanced pressure area in the vacuum cylinder and causes the drilling fluid into the hollow shaft of the rotator through suction pipe under the atmosphere pressure, and then lets the fluid spray to the walls of the cylinder from the windows on the hollow shaft, now the gas bubble cut in the mud may break and run off in the function of vacuum pump suction to a safe area due to the fluid collision and bubble separator.

vacuum degasser

However, the mud will enter the drainage cavity forced by its self-weight and pass the rotator and discharge off the cylinder. In addition, drilling mud can enter the pump cylinder only through the suction pipe, and can’t be sucked in through the discharge pipe because the vacuum pump and the master motor are started simultaneously and the rotator connected to the motor will revolve at a high speed.

Difference on vacuum degasser and poor boy degasser fluid processing

Vacuum degasser usually used to separate less gas than poor boy degasser. Although they both are degassing devices. Poor boy degasser is set up before shale shaker in the oil and gas well drilling. Before fluid flowing to shale shaker it need to be processed by poor boy degasser for safety working condition. Especially when the well depth is more than 4KM.

NOV(National Oilwell Varco)Nov Brandt Solids Control Division Is very famous brand around the world.

Vacuum degassers mechanically remove entrained gases such as hydrogen sulfide, carbon dioxide and natural gas from the mud system. Entrained gas can reduce the hydrostatic head of the mud column and can cause catastrophic well control problems.

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BRANDT™ manufactures negative pressure (vacuum) and atmospheric degassers. Vacuum degassers utilize negative pressure to withdraw entrained gases from the mud. In order for this to work, mud is pumped through a venturi, which develops a negative pressure, thus sucking mud into the unit. The mud then flows over dispersion plates, arranged either horizontally or vertically, creating thin sheets of gas-cut mud.

But now there are many Chinese manufactures can produce the vacuum degasser same like Brandt. DC Solids Control Is a China based Solids Control equipments manufacturer, we also offer worldwide vacuum degasser and services.

vacuum degasser

Our vacuum degasser is constructed by main vessel, gas water separator, vacuum pump, motor, and eletric control cabinet. The vacuum degasser could be used in many field, like commercial uses, agricultural uses and oilfield uses. Hereunder we talk about the oilfield uses.In oilfield drilling fluid system, there are 2 types degasser. One is poor boy degasser separate large quantity invaded gas, the other is the vacuum degasser, we also call it gas buster.