- Title : Baker Hughes Surface Loging System
- Publish : Baker Hughes INTEQ Technical Publications Group 2001 Rankin Road Houston, TX 77032
- Type Document : pdf
- Release : July 1996
- Total Page : 138 page
- Size : 3.35 Mb
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Decrypted Contents
Drill Cuttings Evaluation
There is no substitute for accurately logged and collected samples! It can not be stressed enough about the importance of good depth control and sample retrieval techniques. Even though the cuttings will be looked at by members of the mud-logging crew, they often spend more time actually catching the samples and maintaining equipment, hence, the samples are given only a perfunctory look. The onus is on the Wellsite Geologist to provide a detailed description of the drilled cuttings.
There is no substitute for accurately logged and collected samples! It can not be stressed enough about the importance of good depth control and sample retrieval techniques. Even though the cuttings will be looked at by members of the mud-logging crew, they often spend more time actually catching the samples and maintaining equipment, hence, the samples are given only a perfunctory look. The onus is on the Wellsite Geologist to provide a detailed description of the drilled cuttings.
Those rock samples can be obtained from several sources at the rig site:
- Shale Shakers (upper & lower screens)
- Desanders, Desilters and Mud-Cleaners (not lagged)
- Flowline and Possum Belly (not lagged)
At the shale shaker, it is essential that the geologist know the shaker screen sizes, and the grain-size of the cuttings that can be recovered from each screen. A representative sample should be caught from a combination of the screens, not just the top or bottom screen.
While it is desirable to use the finest shaker screens at all times, this is impractical due to high flow rates or when using heavy, viscous mud systems. When this happens, samples can be obtained from the desanders and desilters. These devices recover fine solids from the mud system and should always be checked during routine or top hole drilling. When drill breaks or clastic reservoir sections are expected, then more regular samples should be examined to check for the presence of very fine grained clastics.
While it is desirable to use the finest shaker screens at all times, this is impractical due to high flow rates or when using heavy, viscous mud systems. When this happens, samples can be obtained from the desanders and desilters. These devices recover fine solids from the mud system and should always be checked during routine or top hole drilling. When drill breaks or clastic reservoir sections are expected, then more regular samples should be examined to check for the presence of very fine grained clastics.
When the centrifuge is used to recover very fine material, it should also be checked for very fine clastics (if weighted mud systems are used, the mudcleaner will not be run to prevent excessive barite removal). Samples may also be obtained directly from the flowline using either a very fine sieve or a mudcup and sieve.
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