Experimental Study on the Permeability Characteristics of Sandstone in Different Chemical Solutions

2018 ◽  
Vol 22 (9) ◽  
pp. 3271-3277 ◽  
Author(s):  
Huayan Yao ◽  
Zhenhua Zhang ◽  
Dezhong Li
Keyword(s):  
Experimental Study ◽  
Permeability Characteristics ◽  
Chemical Solutions

scholarly journals Experimental Study on the Fractal Features and Permeability Characteristics of Low Metamorphic Coal Pore Structure under Thermal Damage

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zhen Liu ◽  
Mingrui Zhang ◽  
Shijian Yu ◽  
Lin Xin ◽  
Gang Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pore Structure ◽  
Coal Gasification ◽  
Thermal Damage ◽  
Fractal Model ◽  
Utilization Efficiency ◽  
Heating Process ◽  
Underground Coal Gasification ◽  
External Temperature ◽  
Permeability Characteristics

Underground coal gasification and exploitation of geothermal mine resources can effectively improve coal conversion and utilization efficiency, and the basic theory of the above technologies generally relies on the change law of the coal pore structure under thermal damage. Therefore, the influence mechanism of the development of the coal pore structure under thermal damage is analyzed by the nuclear magnetic resonance experiment, and the temperature-permeability fractal model is created. The results show that compared with microtransitional pores, the volume of meso-macropores in the coal body is more susceptible to an increase in temperature, which was most obvious at 200-300°C. During the heating process, the measured fractal dimension based on the T2 spectral distribution is between 2 and 3, indicating that the fractal characteristics did not disappear upon a change in external temperature. The temperature has a certain negative correlation with DmNMR, DMNMR, and DNMR, indicating that the complexity of the pore structure of the coal body decreased gradually with the increase of the temperature. Compared with the permeability calculated based on the theoretical permeability fractal model, the permeability obtained from the temperature-permeability fractal model has a similar increasing trend as the permeability measured by the NMR experiment when the temperature increases. The experimental study on pore structure and permeability characteristics of the low metamorphic coal under thermal damage provides a scientific theory for underground coal gasification and geothermal exploitation.

Experimental Study of the Dynamic Permeability in Two-Stage Gravel Packs Considering Particle Blockage and Remigration

2020 ◽  
Vol 143 (9) ◽  
Author(s):  
Minhui Qi ◽  
Mingzhong Li ◽  
Tiankui Guo ◽  
Yuan Li ◽  
Yanchao Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Silty Sand ◽  
Two Stage ◽  
Permeability Characteristics ◽  
Gravel Bed ◽  
Dynamic Permeability ◽  
Gravel Size ◽  
Pore Blockage ◽  
Gravel Packing ◽  
Gravel Pack

Abstract The two-stage gravel-packing technique has been widely adopted in the development of unconsolidated sandstone reservoirs with high sanding rates and silt contents. Compared with the traditional gravel-packing operation, the lifespan and long-term conductivity of the two-stage gravel pack improve significantly. In the present study, an experimental study was undertaken to determine the dynamic permeability change of two-stage gravel packs during sand production. Thirty-nine groups of flooding tests were carried out with various experimental settings, and the pressure drop of each section (i.e., the sanding section, gravel bed I, and gravel bed II) was monitored dynamically during flooding. The permeability characteristics of each section were used to determine the mechanisms of sanding, pore blockage, and particle remigration under different packing arrangements. Using the proposed experimental setup, a sensitivity analysis was carried out to study the parameters that may affect the permeability of the sand pack, such as the two-stage gravel size, packing length, flooding rate, and silty sand content. Based on the observed permeability recovery phenomena in gravel bed I during the experiments, a dynamic permeability prediction model considering the remigration of deposited particles was proposed. Compared with the traditional deep-bed filtration model and the experimental results, the verification showed that the new model is more suitable for predicting the dynamic permeability of two-stage gravel packs.

Experimental study of permeability characteristics for the cemented natural fractures of the shale gas formation

2016 ◽  
Vol 29 ◽  
pp. 345-354 ◽  
Author(s):  
Tong Zhou ◽  
Shicheng Zhang ◽  
Yin Feng ◽  
Yuanyuan Shuai ◽  
Yushi Zou ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shale Gas ◽  
Natural Fractures ◽  
Permeability Characteristics ◽  
Gas Formation
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