New system provides continuous quantitative analysis of gas concentration in the mud during drilling

G. L. Roberts, V. C. Kelessidis, J. M. Williams

Research output: Contribution to journalArticle


Continuous monitoring of hydrocarbon gases in drilling fluids at the surface is essential for identification of prospective reservoir zones as well as for safety. This paper describes a new gas-analysis system that determines the total amount of gas in the mud below the bell nipple. The system is continuous, consistent, and fully quantitative (unlike a gas trap) but not labor-intensive (like a steam still). It also recovers and analyzes gas liberated into the air at the bell nipple, which test results have shown to be almost 50% of the total gas in the mud below the bell nipple.

Original languageEnglish
Pages (from-to)219-224
Number of pages6
JournalSPE drilling engineering
Issue number3
Publication statusPublished - 1 Jan 1991


ASJC Scopus subject areas

  • Engineering(all)

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