Characterization of in situ stress conditions at depth-homestake mine, lead, South Dakota

1997 ◽  
Vol 34 (3-4) ◽  
pp. 104.e1-104.e5
Author(s):  
J.M. Girard ◽  
R.W. McKibbin ◽  
J.B. Seymour ◽  
F.M. Jones
Keyword(s):  
South Dakota ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Homestake Mine

3D characterization of coal strains induced by compression, carbon dioxide sorption, and desorption at in-situ stress conditions

2010 ◽  
Vol 82 (3-4) ◽  
pp. 262-268 ◽  
Author(s):  
J. Denis N. Pone ◽  
Phillip M. Halleck ◽  
Jonathan P. Mathews
Keyword(s):  
Carbon Dioxide ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Carbon Dioxide Sorption

Experiment on Mechanical Properties and Seepage Capability of Deep Tight Sandstone Under True-Triaxial Stresses Environment

2021 ◽  
Author(s):  
Jiaying Li ◽  
Chunyan Qi ◽  
Ye Gu ◽  
Yu Ye ◽  
Jie Zhao
Keyword(s):  
Mechanical Properties ◽  
In Situ Stress ◽  
Stress Sensitivity ◽  
Stress Conditions ◽  
Tight Sandstone ◽  
Gas Reservoir ◽  
True Triaxial ◽  
Strain Behavior ◽  
Triaxial Stresses

Abstract The characteristics of seepage capability and rock strain during reservoir depletion are important for reservoir recovery, which would significantly influence production strategy optimization. The Cretaceous deep natural gas reservoirs in Keshen Gasfield in Tarim Basin are mainly buried over 5000 m, featuring with ultra-low permeability, developed natural fractures and complex in-situ stress states. However, there is no comprehensive study on the variation of mechanical properties and seepage capability of this gas reservoir under in-situ stress conditions and most studies on stress-sensitivity are conducted under conventional triaxial or uniaxial stress conditions, which cannot truly represent in-situ stress environment. In this work, Cretaceous tight sandstone in Keshen Gasfield was tested under true-triaxial stresses conditions by an advanced geophysical imaging true-triaxial testing system to study the stress-sensitivity and anisotropy of rock stress-strain behavior, porosity and permeability. Four groups of sandstone samples are prepared as the size of 80mm×80mm×80mm, three of which are artificially fractured with different angle (0°,15°，30°) to simulate hydraulic fracturing. The test results corresponding to different samples are compared to further reveal the influence of the fracture angle on rock mechanical properties and seepage capability. The samples are in elastic strain during reservoir depletion, showing an apparent correlation with fracture angles. The porosity decreases linearly with stress loading, where the decrease rate of effective porosity of fracture samples is significantly higher than that of intact samples. The permeabilities decrease exponentially and show significant anisotropy in different principal stress directions, especially in σH direction. The mechanical properties and seepage capability of deep tight sandstone are successfully tested under true-triaxial stresses conditions in this work, which reveals the stress-sensitivity of anisotropic permeability, porosity and stress-strain behavior during gas production. The testing results proposed in this paper provides an innovative method to analyse rock mechanical and petrophysical properties and has profound significance on exploration and development of tight gas reservoir.

An Electrokinetic Testing Apparatus for Undisturbed/Remoulded Soils under In-Situ Stress Conditions

2000 ◽  
Vol 23 (2) ◽  
pp. 215 ◽  
Author(s):  
RC Chaney ◽  
KR Demars ◽  
JQ Shang ◽  
KL Masterson
Keyword(s):  
In Situ Stress ◽  
Stress Conditions ◽  
Testing Apparatus

scholarly journals Hydraulic Fracture Propagation under Varying In-situ Stress Conditions of Reservoirs

2017 ◽  
Vol 191 ◽  
pp. 410-418 ◽  
Author(s):  
P.L.P. Wasantha ◽  
H. Konietzky
Keyword(s):  
Hydraulic Fracture ◽  
Fracture Propagation ◽  
In Situ Stress ◽  
Stress Conditions ◽  
Hydraulic Fracture Propagation

scholarly journals CHARACTERIZATION OF IN-SITU STRESS AND PERMEABILITY IN FRACTURED RESERVOIRS

2003 ◽  
Author(s):  
Daniel R. Burns ◽  
M. Nafi Toksoz
Keyword(s):  
Fractured Reservoirs ◽  
In Situ Stress

scholarly journals Site Monitoring and Numerical Modelling of a Trial Embankment's Behaviour on Venice Lagoon Soils

2011 ◽  
Vol 2011 ◽  
pp. 1-11
Author(s):  
Valentina Berengo ◽  
Thomas Benz ◽  
Paolo Simonini ◽  
Martino Leoni
Keyword(s):  
Creep Behaviour ◽  
Back Analysis ◽  
Venice Lagoon ◽  
In Situ Stress ◽  
Site Monitoring ◽  
Circular Test ◽  
Soil Behaviour ◽  
Constitutive Parameters

Mineralogical and mechanical characterization of Venice lagoon soils is required for design and construction of movable floodgates that aim to safeguard the city of Venice against recurrent floods. An instrumented circular test embankment was constructed in the lagoon area, enabling accurate measurement of relevant ground displacements. In situ stress-strain-time measurements were carried out in order to investigate the viscous behaviour of Venice lagoon soils during and after embankment loading. Site monitoring was kept up also during embankment removal so that information on soil behaviour in unloading is available, too. This paper illustrates key results from embankment monitoring and also focuses on modelling of creep behaviour. A recently developed anisotropic constitutive model was calibrated for Venice lagoon soils and is used in back analysis of the embankment construction and removal process. The constitutive parameters of the model were calibrated from in situ and laboratory tests.

scholarly journals CHARACTERIZATION OF IN-SITU STRESS AND PERMEABILITY IN FRACTURED RESERVOIRS

2005 ◽  
Author(s):  
Daniel R. Burns ◽  
M. Nafi Toksoz
Keyword(s):  
Fractured Reservoirs ◽  
In Situ Stress
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