Investigation on electromagnetic measurement ahead of drill-bit

Qiang Zhou, Doug Gregory, Siyuan Chen, Weng C. Chew

Research output: Contribution to conferencePaper

Abstract

In drilling for oil, we occasionally encounter overpressured shale zones which can be disastrous to drilling. The overpressured zones usually exhibit lower electrical resistivity. Electromagnetic methods are therefore proposed to predict the location and intensity of the overpressured zones at tens of meters ahead of a drill-bit. The existing methods in petroleum well logging are sensitive to the formation volume up to 3 meters lateral to the borehole. To predict the formation ahead of drill-bit, it is essential to use a time-domain or a wide-band frequency domain approach. In a conductive medium, the high frequency fields are more confined to the volume around the source while the low frequency components reach larger volume of formation. In the time-domain situation, early time response is closely related to the formation property near the sensor while later time measurement is more sensitive to the property of the far away formation. It is found that the presence of an overpressured zone at 10's of meters ahead of a drill-bit can be detected. Besides the prediction of overpressured zone, the method can also provide better geosteering to guide the drilling trajectory and to improve formation evaluation.

Original languageEnglish (US)
Pages1745-1747
Number of pages3
StatePublished - Dec 1 2000
Event2000 Intenational Geoscience and Remote Sensing Symposium (IGARSS 2000) - Honolulu, HI, USA
Duration: Jul 24 2000Jul 28 2000

Other

Other2000 Intenational Geoscience and Remote Sensing Symposium (IGARSS 2000)
CityHonolulu, HI, USA
Period7/24/007/28/00

ASJC Scopus subject areas

  • Computer Science Applications
  • Earth and Planetary Sciences(all)

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    Zhou, Q., Gregory, D., Chen, S., & Chew, W. C. (2000). Investigation on electromagnetic measurement ahead of drill-bit. 1745-1747. Paper presented at 2000 Intenational Geoscience and Remote Sensing Symposium (IGARSS 2000), Honolulu, HI, USA, .