Category Archives: Mud gas separator

Major types and features of DC Solid control Mud gas separator

Mud gas separator (also called poor boy degasser or gas-buster) is a vertical vessel which is used to remove undesired gas from drilling mud when it returns from the well while circulating mud in order to control the well. The mud gas separator is designed in multiple capacities, to meet specific drilling rig conditions.

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Features and advantages :

1. High efficiency and easy to maintain
2. Large capacity
3. Easy transportation and installation.
4. Maximizes free gas/mud separation
5. Unique U-shaped tube design eliminates moving parts and ensures a positive fluid seal, maintaining safe mud levels
6. Efficient baffle arrangement to easily separate gas from fluid
7. Available in varying sizes and lengths, accommodating any volume of fluid with high concentrations of gas
8. Heavy-duty steel construction and adjustable mounting skid for any rig

There are three three major types of mud gas separators:

1. Open bottom: These separators are often called “poor boys,” and immerse the bottom of the machine in the mud deposit.
2. Closed bottom: A closed bottom mud gas separator features a sealed base, which directs the mud return into the storage tank.
3. Float: The float design is similar to the closed bottom type of separator, except that it has a valve rather than a permanently sealed line for the mud return. Fixed or elevated pedestals are also used to mount the base.

DC Solid control can design and fabricate the poor boy in varying sizes and lengths to meet your specific drilling conditions.

Pertinent features of the Mud gas separator from DC Solid control

In the oilfield, the mud gas separator is sometimes known as “poorboy degasser” or “gas buster”. They may be vertical or horizontal in design.

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A vertical separator is normally used for high fluid throughput, while a horizontal separator provides a longer retention and superior gas separating capacity. Internal design and configuration governs the individual efficiency of the equipment.

The mud gas separators should be designed to a recongised pressure vessel code. To avoid plugging by solids, hydrates or mechanical malfunction, the separator back pressure should be controlled by a liquid seal rather than conventional back pressure regulators or liquid level control valves. A pressure gauge is required to monitor the pressure in the separator vessel.

If you want to know more detailed about the mud gas separators, please contact me soon.

What will making mud gas separator blow-through.

DCZYQ Mud gas separators are intended to sustain safety for high pressure wells. Our units are closed bottom skid mounted model designed around safety and precision. Uniquely designed baffles break up mud and gas which is then expelled by the gas vent line to the flare line.

mud-gas-separator

But what will cause the mud gas separator blow-through.

1. Friction pressure of the gas venting through the vent line exceeds the mud-leg hydrostatic pressure, resulting in evacuation of fluid from the separator. Friction pressure of the mud through the mud return line is considered negligible because of its short length.

2. Vessel ID is too small, causing insufficient retention time for the gas to separate efficiently from the mud. This situation is commonly called insufficient separator cut.

To estimate a peak gas flow rate properly, we must consider a “typical” kick. The typical kick will depend on the well location, depth, type size, and component ratios of influx. Kick data should be based on previous offset well data and should be a realistic worst-case gas kick.

Matching using the mud gas separator and vacuum degasser in mud system

In oilfield mud system, there are two equipment used for removing the harmful gas from drilling fluids. They are mud gas separator and vacuum degasser.

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. These dispersion plates bring entrained gases closer to the surface for easy removal by a stand-alone vacuum pump. The choice between horizontally or vertically mounted units is typically based on the footprint requirements of the specific rig.

vacuum degasser

Degassers 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, gumbo removal equipment (if utilized), shale shakers and mud conditioners (if utilized), while hydrocyclones and centrifuges follow in the arrangement.

Mud/gas separators and 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. BRANDT manufactures both mud/gas separators and degassers.

mud gas separator

Mud/gas separators are the first units of solids control equipment arranged to treat mud. As such, they process all of the mud from the flowline before the mud reaches the primary shale shakers. The units have no moving parts and rely on the density difference between the gas and the mud for removal. The process is simple, yet very effective.

Highlights of the mud gas separators produced by DC Machinery

DC Machinery mud gas separators are designed to provide safe drilling procedures during horizontal, underbalanced, h2s, or high pressure drilling. Our gas buster captures and separates the mud/gas then safely vents free gas to the flare line to be burned off while returning mud to the mud pits.

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DC Machinery separators are intended to sustain safety for high pressure wells or when sour gas may be present. Our units are closed bottom skid mounted model designed around safety and precision. Uniquely designed baffles break up mud and gas which is then expelled by the gas vent line to the flare line.

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Highlights of Mud gas separators

Designed for horizontal, underbalanced, h2s, or high pressure drilling
Numerous size specifications available
ASME Sec VIII Div 1 Code Vessels
Unique Baffling
External Pressure Gauge
H2S certified with internal coating

The mud gas separator is manufactured for efficient installation from one rig move to the next. DC Machinery offers rig up of our gas buster and if needed can tie in and/or modify all lines from choke manifold to trip tank, frac tank, panic line, gas buster, and flare line. We supply competitive and cost effective connect and disconnect fees of our equipment.

Making use of liquid gas separator during drilling

Liquid gas separator adopts anti hydrogen sulfide material and drilling liquid gas separator using high quality materials made by modern technology, this device can effectively prevent the erosion caused by harmful gases in the drilling fluid, and finally to ensure the safety of personnel and equipment. When construction, some toxic and harmful gases carried by drilling fluid carrying will be carried up. For these reasons will cause the proportion and viscosity of drilling fluid get large deviation, unable to meet the drilling requirements; And sometimes serious problems if not timely treatment will cause well kick, or even a blowout accident. The smooth progress of the drilling process can be ensured when the liquid gas separator is used together with the electronic ignition device. Design concept of liquid gas separator for separating mud contained a large amount of dissolved gas and free gas, and because these gases will expand at normal pressure. So the traditional liquid gas separator placed between the throttle manifolds and shale shaker, connected to a pipe dedicated for exhaust gas.
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Liquid gas separator should generally be required to meet the following requirements:
Liquid gas separator inlet pipe diameter should be equal to or greater than the diameter of the throttle manifold discharge pipeline.
The inner diameter of the slurry discharge pipeline of the liquid gas separator shall be not less than the inside diameter of the inlet pipe, and the slurry is directly discharged into the inlet pipe of the vibrating screen or the slurry storage tank.
According to the practical experience, the processing capacity of the liquid gas separator must be 5 times as much as the design cycle.

Adjustable pedestal type mud gas separator

Due to different floor height of drilling rig, so the height of solid control system matched to it is different, thus making the height from ground of liquid gas separator in well control and the connector of solid control system change. The height from ground of the past liquid gas separator and interface  of solid control system is the approximate height developed by oil field customers, and doing some changes to the ground where the liquid gas separator is located on if there is still disparity after delivery, pad it if lower and dig out the ground with equal size, which is not only a waste of time, delay the progress of the production, but also increased the intensity of labor.

Adjustable pedestal type liquid gas separator provides the pedestal that has a simple structure, reasonable design, easy to use and easy to adjust the height of the liquid gas separator.

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In order to achieve the above purpose, the adjustable pedestal type liquid gas separator is realized by the following technical scheme:

  1. It includes the, a fixed tube and the bottom plate, four corners of the plate surface are all welded with fixed pipe, the lift pipe is inserted in each of the fixed pipe, a fixed tube is fixedly connected with lifting pipe through the fixed pin shaft and a pin.
  2. The lift pipe and the fixed pipe surface of adjustable pedestal type liquid gas separator of are equipped with a plurality of uniform arrangement of holes.

Compared with the existing technology, adjustable pedestal type liquid gas separator has the characteristics of low cost, simple structure, reasonable design, convenient use, practical, and effective realization of the easy adjustment of the height of the liquid gas separator, reduce the labor intensity, reduce the production cost and  improve the work efficiency.

Technical guidance for drilling mud gas separator

Mud gas separator is the equipment designed for dealing with drillig fluid which containing a large amount of dissolved gas or free gas, these gases will be expanded under atmospheric pressure. Traditional mud gas separator is located between the throttle pipe and the vibrating screen, it has a pipeline for direct discharge of gas. Liquid gas separator is usually installed in the rear of the throttle manifold.

DC mud gas separator

DC mud gas separator


 

The mud gas separator shall meet the following requirements:

(1) According to the practical experience, the processing capacity of the liquid gas separator must be 5 times as much as the design cycle.

(2) The inner diameter of the pipeline should be equal to or greater than that of the choke manifold inner diameter of throttle manifold of the mud gas separator.

(3) The inner diameter of the drilling fluid discharge pipeline of the liquid gas separator should be not less than the diameter of the inlet pipeline, and the drilling fluid is directly discharged into the inlet manifold of the shale shaker or the reserve tank of the drilling fluid.

(4) The diameter of the exhaust pipe should be 200mm (8in) or greater.

(5) Valve should not be installed on the gas discharge line.

All the tasks of liquid gas separator should be guided by the toolpusher who will  decide when the drilling fluid should return to the shale shaker after through the liquid gas separator