Determining the lateral stress coefficient for a Teflon gland packing

1994 ◽  
Vol 30 (3) ◽  
pp. 106-108
Author(s):  
V. D. Prodan ◽  
G. V. Bozhko ◽  
I. K. Kalabekov
Keyword(s):  
Lateral Stress ◽  
Stress Coefficient ◽  
Gland Packing ◽  
Lateral Stress Coefficient

scholarly journals In Situ Stress Distribution and Its Control on the Coalbed Methane Reservoir Permeability in Liulin Area, Eastern Ordos Basin, China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Peng Feng ◽  
Song Li ◽  
Dazhen Tang ◽  
Liangjun Wu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Ordos Basin ◽  
In Situ Stress ◽  
Burial Depth ◽  
Lateral Stress ◽  
High Permeability ◽  
Depth Zone ◽  
Stress Coefficient ◽  
Lateral Stress Coefficient

Permeability is one of the important factors that affect the production efficiency of coalbed methane, and it is mainly controlled by in situ stress. Therefore, it is very essential to study the in situ stress and permeability for the extraction of coalbed methane. Based on the injection/falloff well test and in situ stress measurement of 35 coalbed methane wells in the Liulin area in the east of the Ordos basin, the correlations between initial reservoir pressure, in situ stress, lateral stress coefficient, permeability, and burial depth were determined. Finally, the distribution characteristics of in situ stress and its influence on permeability were analyzed systematically. The results show that with the increase of burial depth, the initial reservoir pressure and in situ stress both increase, while the lateral stress coefficient decreases. The permeability variation is related to the type of stress field in different burial depths, and its essence is the deformation and destruction of coal pore structures caused by stress. The distribution characteristics of in situ stress at different depths and its effect on permeability are as follows: at depths < 800   m , the horizontal principal stress is dominant ( σ H ≥ σ v > σ h ) and the permeability is a simple decreasing process with the increase of the depth; at depths > 800   m , the vertical stress is dominant ( σ v ≥ σ H > σ h ). The permeability of most coal is very small due to the large in situ stresses in this depth zone. However, because of the stress release at the syncline axis, coal with high permeability is still possible at this depth zone. Due to the existence of high permeability data points at burial depth (>800 m) and the fitting relationship between permeability and vertical stress, the maximum and minimum horizontal principal stress is poor. However, the coal permeability and lateral stress coefficient show a good negative exponential relationship. This indicates that the lateral stress coefficient can be used to predict permeability better.

Lateral stress measurements in a glaciomarine silty clay

1991 ◽  
Vol 7 (1) ◽  
pp. 265-270
Author(s):  
J. P. Sully ◽  
R. G. Campanella
Keyword(s):  
Temperature Effects ◽  
Silty Clay ◽  
Lateral Stress ◽  
Total Stress ◽  
Stress Measurements ◽  
Pore Pressures ◽  
Stress Coefficient ◽  
Lateral Stress Coefficient ◽  
Pressure And Temperature Effects

AbstractThe paper presents the procedure used for installation of spade-like total stress cells (TSC) in an overconsolidated silty clay and subsequent interpretation of the data obtained. Prior to installation, all the spade cells were calibrated in the laboratory for both pressure and temperature effects. After extraction from the ground, the stress cells were recalibrated and changes in the calibration characteristics were noted. These changes presumably result from the effects of installation. The stress cells were read over a period of three months. The measured stresses, pore pressures and temperatures are evaluated to provide a profile of the lateral stress coefficient for the site.

scholarly journals Evaluation of at Rest Lateral Stress Coefficient Influenced by Particle Condition

2012 ◽  
Vol 28 (8) ◽  
pp. 21-29 ◽  
Author(s):  
Jung-Hwoon Lee ◽  
Dong-Ryeol Lee ◽  
Tae-Sup Yun ◽  
Jun-Hwan Lee
Keyword(s):  
Lateral Stress ◽  
Stress Coefficient ◽  
Lateral Stress Coefficient
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