Temperature and pressure effect on permeability of Chinese sandstone: A review.

Ge, Zhenlong

doi:10.13168/agg.2018.0021

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…The calcium and magnesium contents in group 5 are 9.05 and 15.66 times those of the control group, respectively, and the aluminum and iron contents are 11.71 and 12.53 times those of the control group, respectively. However, the K + in the sandstone does not change much, mainly because the potassium feldspar is difficult to be acidified and destroyed. − …”

Section: Summary and Conclusionmentioning

confidence: 99%

Study on the Performance Degradation of Sandstone under Acidification

Shi

2020

ACS Omega

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In most oilfields, acid fracturing is widely used for oil production. Understanding the relationship between the individual factors (i.e., carbonate rock types, acid rock reaction kinetics, and deterioration of rock mechanical properties) can provide practical guidelines that can be used for the design and optimization of acid fracturing operation. This paper takes hydrochloric acid, acetic acid, and citric acid as the main research objects and carries out acidification experiments on sandstone in Changqing Oilfield, China. In addition, the effects of tribasic, dibasic, and monobasic acids on the mechanical properties of sandstone were studied. Results show that in this study area, the most obvious effect was seen with the use of dibasic acids (hydrochloric acid + acetic acid), which effectively reduced the sample quality, uniaxial compressive strength, and elastic modulus. Citric acid and Mg promote the conversion of amorphous calcium carbonate to high-crystallinity calcite, forming a white precipitate. Furthermore, it is found by scanning electron microscopy analysis that experimental group 5 (hydrochloric acid + acetic acid) has the most ideal rock erosion effect. Inductively coupled plasma emission spectrometry analysis shows that the acid rock is present in the solution. X-ray diffraction qualitative analysis of the composition and concentration of ions shows that the formation of white precipitates is citric acid and Mg promotes the conversion of amorphous calcium carbonate to high-crystallinity calcite, forming a white precipitate. The findings of this study can help to better understand the erosion, failure state, and failure mechanism of different acid types on sandstone, which may provide certain references and guidelines for sandstone acid fracturing oil production.

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Section: Summary and Conclusionmentioning

confidence: 99%

Study on the Performance Degradation of Sandstone under Acidification

Shi

2020

ACS Omega

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“…Although there have been numerous studies on the gas permeability characteristics of rocks after exposure to high temperatures and their influential mechanisms, limited research has been conducted on the permeability of liquids in rocks under similar conditions, particularly in high-temperature mudstone [18][19][20][21][22][23][24]. Samples of mudstone were collected from the coal bed roof's aquifer layer in the Taiyuan-Shanxi Formation of the Ordos Basin.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Permeability Characteristics of Mudstone under High Temperature Overburden Condition

Ma,

Zhang,

et al. 2023

Processes

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High-temperature treatment significantly impacts the permeability of mudstone. The permeability of mudstone after exposure to high temperatures is closely influenced by the temperature it experiences and the stress state it is subjected to. This study examines the change in macroscopic physico-mechanical properties of mudstone with temperature following high-temperature treatment. Additionally, we conducted experimental research on the gas and water seepage behavior of mudstone specimens from the top of the coal seam of Taiyuan Group–Shanxi Group in the Ordos Basin. The coal-rock mechanics-permeability test system TAWD-2000 was employed for this purpose. Subsequently, we analyzed the evolution of mudstone permeability after high-temperature treatment with consideration to temperature, axial pressure, and other influencing factors. The findings reveal that gas permeability of mudstone gradually increases with increasing temperature, while water permeability initially decreases and subsequently increases. Furthermore, both gas and water permeability of mudstone exhibit a trend of decreasing and then increasing with rising stress levels after undergoing the same high-temperature treatment. We constructed a quadratic mathematical model with a goodness of fit of 99.4% and 89.2% to describe the relationship between temperature–stress coupling and mudstone gas and water permeability. This model underscores the significance of temperature–stress coupling on mudstone permeability and provides valuable guidance for numerically calculating the gas–water transport law of peripheral rock in the underground coal gasification process and its practical application in engineering.

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“…The mechanical properties of high buried depth reservoirs have high particularity and complexity [15]. With the increase in formation pressure, the strain borne by the reservoir rocks gradually increases, the damage evolution characteristics are more obvious, and the elastoplastic damage coupling effect is more obvious, showing the special mechanical properties of the brittle-ductile transformation that are different from shallow rocks [16]. At present, there is little research on the elastic-plastic damage coupling mechanical properties of rock under high buried depth environments.…”

Section: Introductionmentioning

confidence: 99%

Study on Elastoplastic Damage Coupling of Reservoir Mudstone Considering Permeability Change

Jing

Mei²,

Zhao³

2022

Sustainability

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Mudstone, a common complex medium in oil and gas reservoirs and with widely distributed micro-pore and micro-fissures, is liable to produce significant damage evolution and plastic deformation under high buried depth stress environments. Based on the analysis of the physical characteristics, the elastoplastic damage coupling mechanical characteristics of mudstone in a high buried depth reservoir for oil and gas engineering are discussed. Firstly, conventional triaxial compression tests under different confining pressures were performed to calculate the damage variable and obtain the damage evolution. The damage evolution included the elastic damage stage, the plastic-dominated elastoplastic damage coupling stage and the damage-dominated elastoplastic damage coupling stage. Secondly, a coupled elastoplastic damage mechanical model for mudstone was proposed, which was based on the degradation of the damage stiffness and plastic flow caused by the plastic and damage internal variables and considered the elastic damage coupling and elastoplastic damage coupling during the loading process. Thirdly, the elastoplastic damage coupling mechanical characteristics of mudstone were simulated. The simulation results are in good agreement with the experimental results, which reflects well the mechanical characteristics of mudstone, including the transition from volume compression to expansion, plastic hardening, damage softening and residual strength, etc. Finally, based on the relevant research results, a permeability evolution model of mudstone based on the damage was proposed, and the secondary development was carried out based on ABAQUS. UMAT and USFLD subroutines were compiled, and seepage–stress coupling simulation verification was carried out. The relevant results provide a reliable basis for engineering theory research and stability analysis of deep mudstone reservoirs.

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Temperature and pressure effect on permeability of Chinese sandstone: A review.

Cited by 11 publications

References 27 publications

Study on the Performance Degradation of Sandstone under Acidification

Study on the Performance Degradation of Sandstone under Acidification

Experimental Study on Permeability Characteristics of Mudstone under High Temperature Overburden Condition

Study on Elastoplastic Damage Coupling of Reservoir Mudstone Considering Permeability Change

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