Examination of Methods to Measure Capillary Threshold Pressures of Pelitic Rock Samples

Kawaura, Kei; Akaku, Kohei; Nakano, Masami; Itô, Daisuke; Takahashi, Takashi; Kiriakehata, Shinichi

doi:10.1016/j.egypro.2013.06.459

Cited by 20 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its low porosity and permeability play a very important role in the accumulation and preservation of hydrocarbons [2,3]. Currently, the sealing capacity of shale is mainly evaluated by high-pressure mercury intrusion, gas diffusion test, triaxial stress test and breakthrough pressure test [4][5][6], from the perspective of throat size, porosity, permeability, diffusion coefficient and gas breakthrough pressure [7][8][9][10]. Due to experimental limitations (such as high pressure, threshold time, relaxation time and pore size), however, these methods are deficient in some respects, for example, the destructive effects of high-pressure mercury intrusion on pore structure at the high-pressure stage and the dependence on threshold in CT scan identification [11].…”

Section: Introductionmentioning

confidence: 99%

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

Xiao

et al. 2022

Energies

View full text Add to dashboard Cite

The porous and low-permeability characteristics of a shale gas reservoir determine its high gas storage efficiency, which is manifested in the extremely high breakthrough pressure of shale. Therefore, the accurate calculation of breakthrough pressure is of great significance to the study of shale gas preservation conditions. Based on a systematic analysis of a low-field NMR experiment on marine shales of the Longmaxi Formation in the Sichuan Basin, a shale gas breakthrough pressure determination technique different from conventional methods is proposed. The conventional methods have low calculation accuracy and are a tedious and time-consuming process, while low-field NMR technique is less time-consuming and of high accuracy. Firstly, the NMR T2 spectrum of shale core sample in different states is measured through low-field NMR experiment. The NMR T2 spectra of sample in water-saturated state and dry state are combined to model the mathematical relationship between shale gas breakthrough pressure and NMR T2 spectrum. It is found that the gas breakthrough pressure is power-exponentially related to the geometric mean of NMR T2 spectrum and positively related to the proportion of micropores. Accordingly, the shale gas breakthrough pressure is quickly and accurately calculated using continuous NMR logging data and then the sealing capacity of the shale caprocks is evaluated, providing basic parameters for analyzing unconventional hydrocarbon accumulation, preservation and migration. This technique has been successfully applied with actual data to evaluate the sealing capacity of shale caprock in a shale gas well in the Sichuan Basin. It can provide a good basis for the evaluation and characterization of shale oil and gas reservoirs.

show abstract

Section: Introductionmentioning

confidence: 99%

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

Xiao

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…The capillary breakthrough pressure and the gas effective permeability can be measured using gas breakthrough experiments in a core flooding system. A number of researchers have presented the results of experimentally and analytically determined capillary breakthrough pressure and gas effective permeability . It should be pointed out that breakthrough pressure is still an important core scale parameter to evaluate the capillary sealing efficiency of caprock …”

Section: Introductionmentioning

confidence: 99%

Parametric analysis of caprock integrity in relation with CO₂ geosequestration: capillary breakthrough pressure of caprock and gas effective permeability

et al. 2015

View full text Add to dashboard Cite

Caprock integrity is a primary criterion for evaluating depleted oil and gas reservoirs for long‐term safety of carbon dioxide geosequestration. The occurrence of capillary leakage is inevitable in caprock. This phenomenon occurs whenever the buoyancy pressure due to accumulated CO2 plumes dominates the capillary pressure of caprock, and thereby the plumes intrude into the pore throats. In this study, experimental investigation of the effective parameters, including overburden pressure, ambient temperature, and CO2 impurities in the form of non‐condensable and non‐reactive CH4 and N2 gases on the capability of shale and anhydrite cores to preserve CO2 gas is conducted. In this regard, capillary breakthrough pressure and CO2 gas effective permeability analysis were performed applying two distinct techniques, step by step and residual capillary pressure. Experiments were conducted at the temperatures of 35, 70, and 90 °C and overburden pressures in the range of 3500–5800 psi. Two main seal rocks, including shale and anhydrite core samples, from middle Asmari and Gachsaran formations of the Zagros Basin located in the southwest of Iran were used. Regarding the high capillary breakthrough pressure and low gas effective permeability after outbreak of the leakage, all three parameters have noticeable effects on capillary sealing efficiency of the caprocks. The results indicate that impurities such as CH4 and N2 have a significant effect on capillary breakthrough pressure of caprock and gas effective permeability. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

show abstract

Permeability of porous media: Role of the critical pore size

2017

View full text Add to dashboard Cite

The knowledge of the permeability of porous media is crucial to understand fluid flow in various natural and artificial materials. Due to the complex nature of pore structure, the pore characteristic (porosity and pore radius) determining the permeability has long been under discussion. Here we determined the critical pore radius, which is the radius of the largest sphere that can freely pass through a porous medium, using the water expulsion method, an experimental technique measuring the pressure at which gas passes through a water‐saturated porous medium. We demonstrate that the critical pore radius correlates well with the permeability for a variety of porous granular media and volcanic products with an extensive range of porosities (0.71%–50%) and permeabilities (10−20–10−10 m2). We also obtained a porosity‐critical pore radius‐permeability relationship that provides a better prediction of the permeability compared with predictions obtained by previous correlations.

show abstract

Examination of Methods to Measure Capillary Threshold Pressures of Pelitic Rock Samples

Cited by 20 publications

References 7 publications

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

Parametric analysis of caprock integrity in relation with CO₂ geosequestration: capillary breakthrough pressure of caprock and gas effective permeability

Permeability of porous media: Role of the critical pore size

Contact Info

Product

Resources

About

Examination of Methods to Measure Capillary Threshold Pressures of Pelitic Rock Samples

Cited by 20 publications

References 7 publications

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

A Technique to Determine the Breakthrough Pressure of Shale Gas Reservoir by Low-Field Nuclear Magnetic Resonance

Parametric analysis of caprock integrity in relation with CO2 geosequestration: capillary breakthrough pressure of caprock and gas effective permeability

Permeability of porous media: Role of the critical pore size

Contact Info

Product

Resources

About

Parametric analysis of caprock integrity in relation with CO₂ geosequestration: capillary breakthrough pressure of caprock and gas effective permeability