Advanced Formation Fluid Evaluation While Drilling with a New Heavy Gas Detector

Roberto Schifano

Risultato della ricerca: Otherpeer review

Abstract

In this paper, a chromatograph which exploits the benefits of FID technology optimized for the high resolution detection of heavierhydrocarbon gas components is described. The components analyzed span from n-hexane to toluene. Flame Ionization Detector (FID)technology is not new to gas detection on the field, however it had never been applied to the detection of gases heavier than n-pentane.The instrumentation has been installed and run on a number of wells in different fields and countries, and it has operated as acomplement of an advanced surface logging system for a period of two years. Unlike other technologies presently utilized for thisscope, this system reduces dedicated equipment and personnel to a minimum.The results presented show the clear identification of formation fluid contacts with higher accuracy than standard light gas detectors,the recognition of contaminants within the drilling fluid, and the practicality of operating an advanced gas detection system withminimal operational and logistic footprint. Some of the indications obtained challenge common beliefs about gas detection: consistentextraction of heavy hydrocarbon gases from the drilling fluid is possible at relatively low temperatures, provided that the entire gasextraction system is rigorously controlled in terms of gas sample pressure, flow, and temperature. Furthermore, gas data analysis canyield indications on the fluid composition even when the gases analyzed are in extremely low quantity.The system utilizes known technologies, developed and optimized to obtain new results. The system supports formation evaluationwhen LWD or wireline can be inconclusive, in the presence of a low porosity pay or fresh water. It can also guide and optimize theMDT testing program. Furthermore, the system takes into account the constraints of drilling operations, and strikes a balance betweendata accuracy and practicality of the application.
Lingua originaleEnglish
Numero di pagine22
Stato di pubblicazionePublished - 2012
Pubblicato esternamenteYes

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