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Ensayos hidrológicos durante la perforación : aplicación del método de registros de la conductividad eléctrica (FFEC) del fluido circulante en una perforación profunda

Tsang, Chin Fu; Rosberg, Jan Erik LU ; Sharma, Prabhakar; Berthet, Theo; Juhlin, Christopher and Niemi, Auli (2016) In Hydrogeology Journal p.1-9
Abstract

Drilling of a deep borehole does not normally allow for hydrologic testing during the drilling period. It is only done when drilling experiences a large loss (or high return) of drilling fluid due to penetration of a large-transmissivity zone. The paper proposes the possibility of conducting flowing fluid electrical conductivity (FFEC) logging during the drilling period, with negligible impact on the drilling schedule, yet providing important information on depth locations of both high- and low-transmissivity zones and their hydraulic properties. The information can be used to guide downhole fluid sampling and post-drilling detailed testing of the borehole. The method has been applied to the drilling of a 2,500-m borehole at Åre,... (More)

Drilling of a deep borehole does not normally allow for hydrologic testing during the drilling period. It is only done when drilling experiences a large loss (or high return) of drilling fluid due to penetration of a large-transmissivity zone. The paper proposes the possibility of conducting flowing fluid electrical conductivity (FFEC) logging during the drilling period, with negligible impact on the drilling schedule, yet providing important information on depth locations of both high- and low-transmissivity zones and their hydraulic properties. The information can be used to guide downhole fluid sampling and post-drilling detailed testing of the borehole. The method has been applied to the drilling of a 2,500-m borehole at Åre, central Sweden, firstly when the drilling reached 1,600 m, and then when the drilling reached the target depth of 2,500 m. Results unveil eight hydraulically active zones from 300 m down to borehole bottom, with depths determined to within the order of a meter. Further, the first set of data allows the estimation of hydraulic transmissivity values of the six hydraulically conductive zones found from 300 to 1,600 m, which are very low and range over one order of magnitude.

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Please use this url to cite or link to this publication:
author
organization
alternative title
Hydrologic testing during drilling : application of the flowing fluid electrical conductivity (FFEC) logging method to drilling of a deep borehole
publishing date
type
Contribution to journal
publication status
in press
subject
keywords
Drilling, Fractured rocks, Heterogeneity, Hydraulic testing, Well logging
in
Hydrogeology Journal
pages
9 pages
publisher
Springer
external identifiers
  • Scopus:84962176097
ISSN
1431-2174
DOI
10.1007/s10040-016-1405-z
language
Spanish
LU publication?
yes
id
1ead9b43-3af3-474a-9385-07bd26423868
date added to LUP
2016-05-18 12:56:17
date last changed
2016-05-20 09:36:59
@misc{1ead9b43-3af3-474a-9385-07bd26423868,
  abstract     = {<p>Drilling of a deep borehole does not normally allow for hydrologic testing during the drilling period. It is only done when drilling experiences a large loss (or high return) of drilling fluid due to penetration of a large-transmissivity zone. The paper proposes the possibility of conducting flowing fluid electrical conductivity (FFEC) logging during the drilling period, with negligible impact on the drilling schedule, yet providing important information on depth locations of both high- and low-transmissivity zones and their hydraulic properties. The information can be used to guide downhole fluid sampling and post-drilling detailed testing of the borehole. The method has been applied to the drilling of a 2,500-m borehole at Åre, central Sweden, firstly when the drilling reached 1,600 m, and then when the drilling reached the target depth of 2,500 m. Results unveil eight hydraulically active zones from 300 m down to borehole bottom, with depths determined to within the order of a meter. Further, the first set of data allows the estimation of hydraulic transmissivity values of the six hydraulically conductive zones found from 300 to 1,600 m, which are very low and range over one order of magnitude.</p>},
  author       = {Tsang, Chin Fu and Rosberg, Jan Erik and Sharma, Prabhakar and Berthet, Theo and Juhlin, Christopher and Niemi, Auli},
  issn         = {1431-2174},
  keyword      = {Drilling,Fractured rocks,Heterogeneity,Hydraulic testing,Well logging},
  language     = {spa},
  month        = {04},
  pages        = {1--9},
  publisher    = {ARRAY(0x76b5c58)},
  series       = {Hydrogeology Journal},
  title        = {Ensayos hidrológicos durante la perforación : aplicación del método de registros de la conductividad eléctrica (FFEC) del fluido circulante en una perforación profunda},
  url          = {http://dx.doi.org/10.1007/s10040-016-1405-z},
  year         = {2016},
}