We need your consent to use the individual data so that you can see information about your interests, among other things. Click "OK" to give your consent.
Standard Test Method for Determining Transmissivity and Storativity of Low Permeability Rocks by In Situ Measurements Using Pressure Pulse Technique (Withdrawn 2017)
Automatically translated name:
Standard Test Method for Determining Transmissivity and Storativity of Low Permeability Rocks by In Situ Measurements Using Pressure Pulse Technique
STANDARD published on 15.9.2008
Designation standards: ASTM D4631-95(2008)
Note: WITHDRAWN
Publication date standards: 15.9.2008
SKU: NS-27960
The number of pages: 8
Approximate weight : 24 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
Earthworks. Excavations. Foundation construction. Underground works
Keywords:
borehole drilling, discontinuities, fault zones, field testing flow and flow rate, groundwater, permeability, pressure testing, pulse testing, rock, saturation, storativity, transmissivity, viscosity, water, water saturation: Borehole drilling, Discontinuities--rock, Fault zones, Field testing--rock, Flow and flow rate--soil/rock/related materials, Permeability--soil/rock, Pressure testing--rock, Pulse testing, Rock materials/properties/analysis, Saturation, Storativity
Significance and Use | ||||||||||||||||||||||||||||||||||||||||||||
Test Method—The pulse test method is used to determine the transmissivity and storativity of low-permeability formations surrounding the packed-off intervals. This test method is considerably shorter in duration than the pump and slug tests used in more permeable rocks. To obtain results to the desired accuracy, pump and slug tests in low-permeability formations are too time consuming, as indicated in Fig. 1 (from Bredehoeft and Papadopulos (1)). Analysis—The transient pressure data obtained using the suggested method are evaluated by the curve-matching technique described by Bredehoeft and Papadopulos (1), or by an analytical technique proposed by Wang et al (2). The latter is particularly useful for interpreting pulse tests when only the early-time transient pressure decay data are available. Units: Conversions—The permeability of a formation is often expressed in terms of the unit darcy. A porous medium has a permeability of 1 darcy when a fluid of viscosity 1 cP (1 mPa·s) flows through it at a rate of 1 cm3/s (10−6 m 3/s)/1 cm2 (10−4 m2) cross-sectional area at a pressure differential of 1 atm (101.4 kPa)/1 cm (10 mm) of length. One darcy corresponds to 0.987 μm2. For water as the flowing fluid at 20°C, a hydraulic conductivity of 9.66 μm/s corresponds to a permeability of 1 darcy. Viscosity of Water—Table 1 shows the viscosity of water as a function of temperature. TABLE 1 Viscosity of Water as a Function of Temperature
|
||||||||||||||||||||||||||||||||||||||||||||
1. Scope | ||||||||||||||||||||||||||||||||||||||||||||
1.1 This test method covers a field procedure for determining the transmissivity and storativity of geological formations having permeabilities lower than 10−3 μm2 (1 millidarcy) using the pressure pulse technique. 1.2 The transmissivity and storativity values determined by this test method provide a good approximation of the capacity of the zone of interest to transmit water, if the test intervals are representative of the entire zone and the surrounding rock is fully water saturated. 1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
||||||||||||||||||||||||||||||||||||||||||||
Historical
1.7.2008
Historical
1.1.2013
Historical
1.2.2013
Historical
1.9.2007
Historical
15.2.2007
Historical
1.7.2008
Latest update: 2024-12-22 (Number of items: 2 217 000)
© Copyright 2024 NORMSERVIS s.r.o.