Pressure measurements in low permeability formations
- Author
- Veneruso, A. F.
- Published
- United States : [publisher not identified], 1980.
Springfield, Va. : National Technical Information Service, [approximately 1980] - Physical Description
- microfiche : negative ; 11 x 15 cm
- Additional Creators
- McConnell, T. D.
- Summary
- This paper examines the performance requirements and identifies candidate hardware implementations for pressure instrumentation that is needed to provide well test data in low permeability formations. Low permeability values are typically defined to be less than 1 microdarcy and are usually encountered in hard rock formations, such as granite, that are of interest in hot dry rock geothermal, deep exploration drilling, and fluid waste disposal. Groundwater flow in these tight formations has been shown to be dominated by flow-through fractures rather than through the formation's intrinsic permeability. In these cases, we cannot use Darcy's law or the usual dimensionless coefficients to estimate the expected scale factors and dynamic responses necessary to properly select and setup the wellbore pressure instrument. This paper shows that the expected instrument responses can be estimated using some recent work by Wang, Narasimhan, and Witherspoon. This paper further describes the minimum electronic capability that the downhole pressure instrument must have in order to provide the required measurement resolution, dynamic range, and transient response. Three specific hardware implementations are presented based on the following transducers: a quartz resonator, a capacitance gauge, and a resistance strain gauge.
- Report Numbers
- SAND-80-0705C; CONF-800344-2
- Other Subject(s)
- 02 petroleum
- 020200 - petroleum- reserves, geology, & exploration
- 052002 - nuclear fuels- waste disposal & storage
- 12 management of radioactive and non-radioactive wastes from nuclear facilities
- 15 geothermal energy
- 150303 - geothermal exploration & exploration technology- exploratory drilling & well logging
- Equipment
- Geothermal legacy
- Measuring instruments
- Permeability
- Pressure gages
- Reservoir pressure
- Reservoir rock
- Specifications
- Well logging equipment
- Well pressure
- Collection
- NTIS collection.
- Note
- DOE contract number: AC04-76DP00789
OSTI Identifier 5249606
Research organization: Sandia National Labs., Albuquerque, NM (USA).
View MARC record | catkey: 45336198