Would you like to start a free subscription?
Remember me | Forgot password
For full content view: Log in Now!
One of the earliest indications of reservoir quality comes from the mud logging unit, where loggers measure formation gas entrained in the drilling fluid and perform visual descriptions of the cuttings with a low-power microscope. Formation gas is extracted from the recirculated drilling fluid, utilizing a mechanical agitation device commonly known as a gas trap. The liberated gas is then introduced to a gas sensor or gas chromatograph (GC) to provide a gas-in-air composition. The quality of these data is limited, due to the mixing of the liberated gas with air contained in the gas trap, and because substantial amounts of unmeasured formation gas remain in the mud. This characteristic tends to skew the results toward overestimation of methane (C1) and underestimation of the heavier alkanes (C2+), as well as providing a less accurate total gas reading from the reservoir interval. For cuttings, visual inspection is qualitative, and details of the lithological description may vary, based on the experience of the individual mud logger.
This area of the site is restricted.
In order to gain access, please either Log
In, or subscribe to World Oil.
Two options are available to you for creating an account.
1. Get a Free Trial Subscription to World Oil Magazine and gain immediate access to select content on World Oil Online.
Start a Free Trial Subscription and gain immediate access to the complete current issue of World Oil Magazine. Plus, you’ll receive 3 upcoming issues of World Oil Magazine in print or digital format.* You also receive access to the Energy Events Calendar, Industry Statistics and WO Wire’s news and industry coverage.
2. Purchase a subscription to World Oil magazine and gain immediate
and complete access to World Oil Online. As a Total Access subscriber
you will have access to all areas of the site available to registered users and
free subscribers as well as having access to such premium content areas as:
Physical copies of this content may be available for purchase. Visit the Reprints & Back Issues section.
If you are already a paid subscriber and do not have access, please email CustomerService@worldoil.com.
World Oil's specialized upstream Engineering Data Tables featuring the Drill Bit Classifier, Tubing Tables and more. Get Total Access today.
Bangkok - August 25-27
Houston, TX - August 27-29
Houston, TX - November 4-5
All material subject to strictly enforced copyright laws.
© 2014 World Oil. © 2014 Gulf Publishing Company.