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Tag Archives: liquid gas separator

Safety reasons that use mud gas separator in oil& gas drill site

Mud gas separators are commonly used during oil drilling operations, particularly in situations when extraction is likely to yield a large volume of gas.

Often referred to as degassers, these systems offer many benefits when drilling operations are centered on mud columns that are below optimal balance, and in so-called “sour gas” environments when there is a high concentration of hydrogen sulfide in the drilling fluid. Tech-Fab fabricates and manufactures custom mud gas separators for the oil and gas industry and more.

mud gas separator

For safety reasons, mud-based deposits of free gas must be removed from the drilling fluid, and most mud gas separators use uniform technologies to achieve this objective.

Drilling fluid enters the machine through an inlet and is passed over a series of baffles, where physical separation of the gas and the mud takes place. Extracted gases are then rerouted through a flare line for safe elimination, while the mud is fed through a shale shaker before ultimately being deposited in a storage tank. The speed of mud gas separators is measured in gallons per minute, representing the maximum intake capacity at the inlet.

DC Solid control offers a range of mud gas separators and degassers for clients engaged in drilling and extraction activities. To learn more, or to request a price quote, please contact

Application Industries of the poorboy degasser/mud gas separator

Mud gas separator is commonly poor boy degasser. It captures and separates large volume of free gas within the drilling mud. If there is a “KICK” situation, this vessel separates the mud and the gas by allowing it to flow over baffle plates. The gas then is forced to flow through a line and vent it to a flare.

Mud gas separator located at downstream of the choke manifold is one of the important well control equipment that you need to focus. It separates gas out of the mud after the gas comes out of hole.

mud gas separator

DCZYQ series mud gas separator combined with the Flare Ignition Device can be used together to ensure the drilling process smoothly. Our separator is divided into normal pressure separator and pressure auto-control separator according to the pressure.

The Mud Gas Separator is mainly used to remove the enormous free gas from drilling fluids, including poisonous gases like H2S. Currently it is widely used in Drilling Waste Management, oil & gas drilling, trenchless HDD, city bored piling, Coal Bed Gas Solids Control System, Oil Mud Seperation, mining, Oil Sludge Dewatering Systems, Water Drilling, environment protection etc.

DC Manufactures numerous size mud gas separator for oilfield

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

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


The mud/gas separator is designed to provide effective separation of the mud and gas circulated from the well by venting the gas and returning the mud to the mud pits. Small amounts of entrained gas can then be handled by a vacuum-type degasser located in the mud pits. The mud/gas separator controls gas cutting during kick situations, during drilling with significant drilled gas in the mud returns, or when trip gas is circulated up.

We manufacture numerous size specifications including 4’x20’ and 6’x20’ and are capable of producing vessels of all sizes. DC Gas Busters have a 12″ inlet from flow line, 12″ gas vent line to flow line, 12″ return line, and 20″ manhole.

If necessary these lines can be modified with flanged concentric reducers to your desired piping size. The run of the gas vent line continues to ground level for safe and efficient hook up to the flare line piping.

Performance characteristics of mud gas separators

In a well-controlled situation, well bore fluids are directed through the choke and kill manifold to circulate hazardous gas in a safe and controlled manner using the Mud Gas Separator.

In the oilfield, the mud gas separator is sometimes known as ‘poor boy degasser’ or ‘gas buster’. They may be vertical or horizontal in design.

A Vertical separator is normally used for high fluid throughput, while a horizontal separator provides a longer retention time and superior gas separating capacity. Internal design and configuration (e.g. blast chamber, baffle plate etc.) governs the individual efficiency of the equipment.

mud gas separator

Performance characteristics
The limitation to the efficiency of a mud gas separator is dedicated by:
(i) Separating Capacity – the capacity to separate gas from the liquid is determined by the internal configuration and fluid dynamic characteristics of the separator.
(ii) Venting Capacity – the capacity to vent gas through the derrick vent is subject to the backpressure of the vent line and the hydrostatic head of the liquid seal.
(iii) Liquid re-entrainment Capacity – the capacity when the liquid droplets break away from a gas/liquid interface to become suspended in the gas phase. The term re-entrainment is used in separator design because it is assumed that droplets have settled to the liquid phase and are then returned to the gas phase.

It should be noted that the capacity of the separator to separate gas from the liquid may be considerably less than the capacity to vent gas within the limit of the liquid seal.

Types of Mud/Gas Separators

Three types of mud/gas separators commonly are used today: closed bottom, open bottom, and float type.

The closed-bottom separator, as the name implies, is closed at the vessel bottom with the mud return line directed back to the mud
tanks. 1. Mud leg is maintained in the separator by installation of an inverted U-shaped bend in the mud return line. Fluid level can
be adjusted by increasing/decreasing the length of the U-shaped bend.

Commonly called the poor boy, the open-bottom mud/gas separator is typically mounted on a mud tank or trip tank with the bottom of
the separator body submerged in the mud. 2. The fluid level (mud leg) in the separator is controlled by adjusting the fluid level in
the mud tank or by moving the separator up or down within the tank. Mud-tank height can restrict the maximum mud leg obtainable for
open-bottom mud/gas separators.


Fluid level (mud leg) is maintained in a float-type mud/gas separator by a float/valve configuration. 3. The float opens and closes a
valve on the mud return line to maintain the mud-leg level. Valves can be operated by a manual linkage system connected from the
float to the valve, or the valve can be air-operated with rig air. Mud-leg height can be controlled by adjusting the float assembly.

There are some inherent problems in the use of float-type mud/gas separators. The manual linkage separator has experienced problems
with linkage failure resulting in improper opening or closing of the mud-return-line valve. Air-operated valves fail to function if
rig air is lost, resulting in no control of fluid level within the separator. Mud-return-line valves are prone to plug with solids,
preventing mud flowback to the mud pits.

Application of mud gas separator

Mud gas separator or gas buster, is common on most drilling rigs throughout the word. The mud gas separator is uesed to separate wellbore gas from the drilling fluid while circulating out a kick or circulating any gas present in drilling fluid during drilling or workover operation.

mud gas separator

Mud gas separator is a very important component in underbalanced drilling. A typical liquid gas separator is constructed of a cylindrical vessel with a series of baffles in it. The drilling fluid from the wellbore enters the separator,and the action of the fluid hitting the baffles separates easily removed gas from the fluid. The gas exits through a vent line at the top of the separator and is safety vented away from the rig floor. The mud exits the mud gas separator through a line near the bottom of “up hill” to return to the pit system.

Typically, the maximum allowable pressure of the mud gas separator when in use is determined by the fluid leg or height. The density fluid in the fluid leg is dependent on the fluid in use at the time, and therefore, operating pressure of the system is variable. This pressure is usually below 15psi. However, there are mud gas separators applications in which the vessel can operate at the pressure up to 100psi.

The friction pressure of the gas flowing through the vent line must be less than the hydrostatic pressure of the fluid in the fluid leg. If this friction pressure is greater than the hydristatic pressure in the fluid leg, gas well exit the fluid line and flow to the pit system.

Adjustable seater type mud gas separator

The adjustable seater type mud gas separator consists of lifting pipe, foxation pipe and baseboard. The quadrangle of the baseboard are all weld fixation pipe, and each pipe has inserted the lifting pipe. The fixation pipe connected with the lifting pipe by fixation hinge pin, the surface of lifting pipe and fixation pipe all equipped multi-align to grid holes.

Mud gas separator

Why produce the adjustable seater mud gas separator

Because of the different drilling rig with the drill floor height, so the matched solid control system height is different, so that make the height of the connection mouth of the mud gas separator and solid control system and the ground is changed. The heigh between the primary mud gas separator and the solid control system mouth and the ground is formulated by the drilling users, if there is difference after delivery the equipment, we can alter the located ground of the mud gas separator.

The adjustale seater mud gas separator is a kind of simple structure, reasonable design, conveniently to use and realize easily adjust the mud gas separator supporter.

liquid gas separator

Adjustable seater mud gas separator adopts the technology scheme to realize as followings:

1 The quadrangle of the baseboard are all weld fixation pipe, and each pipe has inserted the lifting pipe. The fixation pipe connected with the lifting pipe by fixation hinge pin.

2.The surface of lifting pipe and the fixation pipe of the adjustable seater mud gas separator are all equipped the multi-open holes of align to grid.

Compared with the existing technology, adjustable mud gas separator has the advantages of lower cost, simple structure, reasonable design, convenient to use and strong practicability, it efficiency realize the easily adjust mud gas separator height, reduce the labour intensity, reduce the production cost and improve the working efficiency.

Drilling mud gas separator design and operating

There are a number of design features which affect the volume of gas and fluid that the separator can safely handle. For production operations, gas oil separators can be sized and internally designed to efficiently separate gas from the fluid. This is possible because the fluid and gas characteristics are known and design flow rates can be readily established. It is apparent that ‘gas busters’ for drilling rigs cannot be designed on the same basis since the properties of circulated fluids from gas are unpredictable and a wide range of mixing conditions occur downhole.

mud gas separator

In addition, mud rheological properties vary widely and have a strong effect on gas environment. For both practical and cost reasons, rig mud gas separators are not designed for maximum possible gas release rates which might be needed; however, they should not handle most kicks when recommended shut-in procedures and well control practises are followed. When gas low rates exceed the separator capacity, the flow must be bypassed around the separator directly to the flare line. This will prevent the hazardous situation of blowing the liquid from the bottom of the separator and discharging gas into the mud system.

mud gas separator1

The atmospheric type separator operates on the gravity or hydrostatic pressure principle. The essential design features are:

Height and diameter of separator.
Internal baffle arrangement to assist in additional gas break-out.
Diameter and length of gas outlet.
A target plate to minimise erosion where inlet mud gas mixture contacts the internal wall of the separator, which provides a method of inspecting plate wear.
A U-tube arrangement properly sized to maintain fluid head in the separator.

Since most drilling rigs have their own separator designs, the Drilling Supervisor must analyse and compare the contractor’s equipment with the recommended design to ensure the essential requirements are met.

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