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Surface Data Logging

EAGLE™ : The Constant Volume, Constant Temperature,

Continuous Measurement Gas Extraction System

With the increasing need to improve

hydrocarbon gas measurement while

drilling, Halliburton Sperry Drilling

Services has developed a new gas

extraction system, the EAGLE™, that

addresses issues that long compromised 

the process. Drilling industry had 

witnessed several improvements in gasanalysis equipment that were unfortunately

not accompanied by equal improvements

in the gas extraction process. This system

offers a true constant volume, constant

temperature, gas-in-mud extraction with

consistent, repeatable results.

Issues with existing technology

For years, conventional gas traps (including QGM design) have been the industry standard.They are installed in the shaker header box to break down the mud to liberate entrained gases.

Despite their deficiencies on various fronts, drilling industry had to tolerate these deficiencies,

which include:

-  Mud volume that goes into the trap chamber is continuously changing

due to fluctuating mud level in the header box. Floating traps have

their mechanical drawbacks with known difficulty to install on all

shaker boxes due to size limitations.

-  Along the mud path in the flowline, an amount of gases are given the

chance to evaporate. As lighter gases liberate from the mud easier, the

resulting gas ratios are expected to be compromised.-  Unless the mud reaches the trap with a high temperature, the chances

are slim for heavier gases above C5 to be effectively liberated. C6 and 

heavier gases naturally exist in liquid state and the header box trap has limited capability

to extract them.

-  Uncontrolled mud temperature (especially in deep water wells) leads to inconsistent

temperature for the extraction process.

-  Resulting measurement is considered gas-in-air as the liberated gas is mixed with make-

up ambient air (possibly not pure air) before being sent to the gas analyzers.

Unlike gas-in-air measurement typically run throughout the well, gas-in-mud measurement is

usually used while drilling into reservoirs. The technique uses a special instrument, e.g. Sperry

QGM

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Steam Still, that enhances gas extraction and hence provides a better picture

of the presence and concentrations of formation hydrocarbons. The main

advantages offered by this technique are, a) a constant volume of mud is

consistently analyzed and, b) all entrained gases are liberated.

The disadvantage of existing gas-in-mud measurement is the time it takes tocatch and analyze each gas sample. The instrument is often run few times

only within the reservoir. Unlike the continuous gas-in-air measurement

offered by the shaker box trap, existing gas-in-mud measurement is run on discrete samples.

A New Concept, A New Gas Extraction System

Recently, a new concept has been introduced as an attempt to get the best out of two worlds – 

a system that provides a continuous gas-in-mud measurement while having constant volume

and constant temperature. Halliburton Sperry Drilling Services has developed a system that

offers all advantages of this new concept: the EAGLE™ System (Enhanced Alkane Gas

Liberation and Extraction).

EAGLE™ design addresses all the deficiencies seen in conventional gas traps while

maintaining consistent gas extraction. With its ability to extract heavier hydrocarbons far more

efficiently (see figure below), EAGLE™ represents the perfect choice for advanced gas

analysis systems, e.g. Sperry/FIT DQ1000™ Mass Spectrometer, that analyzes up to C10.

EAGLE™ System main features

•  True constant volume gas extraction system with a hermetic degassing chamber 

•  Continuous Gas-in-Mud measurement fully software controlled 

•  Extraction probe mounts on the highest point on the flowline close to the bell nipple

•  Consistent fixed volume mud sample sucked from the flow line for gas extraction before

 being pumped back to the flowline

•  Controlled temperature for constant degassing temperature

•  Heated mud sample for the extraction of hydrocarbon heavies (C6+)

•  Enhanced mud agitation in sealed degasser chamber guarantees full gas extraction

•   Non-condensing gas sample line prevents re-condensation of the heavies

•  Optionally provides measurement for mud temperature and mud density

Steam Still

Gas sample from a conventional trap. Only traces of heavy gases

could be detected

Gas sample from EAGLE™ System. 

Heavy gases up to C10 could be detected

Gas-in-mudmeasurement

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Reliable Performance

To guarantee reliable, repeatable performance, EAGLE™ design features include:

•  In order to avoid probe blockage with cuttings, EAGLE™ features a cleaning

mechanism with frequent blowbacks to keep the filter clear of cuttings.•  To further keep the probe clean, a unique protector is used not only to reduce the

amount of air drawn down by the flowing mud but also to clean the filter by the

velocity of the main mud flow.

•  The degassing chamber is hermetically sealed to ensure that a pure mud sample with

an exact constant volume is being processed.

•  The sealed degassing chamber is continuously purged in order to guarantee a fresh

sample is being degassed.

•  The trap uses a peristaltic self-priming pump able to handle a certain size of solids in

viscous dense fluids.

•  The pump has a low shear to avoid releasing part of the gases inside the pump.•  The heater is controlled to provide a constant temperature degassing process. Using the

heater is vital when drastic mud temperature variations are observed. The EAGLE™

design permits the use of the heater to be optional and can perfectly run without it.

EAGLE™ System Specifications 

Item  Specifications 

Form factor Skid mounted with removable side panels

Lifting certification DNV 2.7.1

Certification Class 1 div 1 / Zone 1

Heater power supply 3 phase supply 480v (EEX)

Heater operating range 20 to 90 °C (thermostat controlled, ± 1.0 °C)

Data connection IS Circuits & EXD

Sample out flow rate range 0 – 10 L/min

Minimum sample pressure 10 psi

Maximum sample pressure 25 psi

Mud delivery and return pump rate 1 to 8 L/min (adjustable)

Gas trap Configurable, speed control for air motor 

Coriolis meter Mud flow in, mud density in, temperature

Flow meter Sample flow, vent air inVent air to trap Nitrogen or Zero air 

Pump type Peristaltic, self priming with low shear 

For more information, contact us at sperry@Halliburton.com

www.halliburton.com

QGM is a patented design of Texaco

DQ1000 is a trademark of FluidInclusion Technologies (FIT)

 April 2009