A new method for analysis of dual pore size distributions in shale using nitrogen adsorption measurements

Jian-wu, Liu; Li, Peichao; Sun, Zhigang; Lü, Zhiwei; Du, Zonghe; Liang, Haibo; Lu, Detang

doi:10.1016/j.fuel.2017.08.067

Cited by 38 publications

(20 citation statements)

References 29 publications

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Section: Isothermal Adsorption Modelmentioning

confidence: 99%

“…The model of adsorption isotherms is a useful approach to describe the equilibrium phenomenon between the adsorbed amount and the pressure of the adsorbate at a constant temperature, which provided the valuable information on pore structure and capacity in porous materials 26 – 28 . In order to describe and analyze the sorption phenomenon, a number of isothermal models such as Langmuir, Freundlich, Brunauer–Emmett–Teller (BET), Guggenheim-Anderson-de Boer (GAB), and Frenkel-Halsey-Hill (FHH) models have been proposed over the years 29 – 31 .…”

Section: Isothermal Adsorption Modelmentioning

confidence: 99%

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Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

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the understanding of water adsorption and desorption behavior in the shale rocks is of great significance in the reserve estimation, wellbore stability and hydrocarbon extraction in the shale gas reservoirs. However, the water sorption behavior in the shales remains unclear. In this study, water vapor adsorption/desorption isotherms of the Longmaxi shale in the Sichuan Basin, china were conducted at various temperatures (30 °C, 60 °C) and a relative pressure up to 0.97 to understand the water sorption behavior. Then the effects of temperature and shale properties were analyzed, and the water adsorption, hysteresis, saturation and capillary pressure were discussed. The results indicate that water adsorption isotherms of the Longmaxi shale exhibit the type II characteristics. The water molecules initially adsorb on the shale particle/pore surfaces at low relative pressure while the capillary condensation dominates at high relative pressure. Temperature favors the water sorption in the shales at high relative pressure, and the GAB isotherm model is found to be suitable for describe the water adsorption/desorption behavior. The high organic carbon and full bedding are beneficial to water adsorption in the shales while the calcite inhibits the behavior. There exists the hysteresis between water adsorption and desorption at the whole relative pressure, which suggests that the depletion of condensed water from smaller capillary pores is more difficult than that from larger pores, and the chemical interaction contributes to the hysteresis loop for water sorption. The capillary pressure in the shales can be up to the order of several hundreds of Mpa, and thus the desorption of water from the shales may not be as easy as the water adsorption due to the high capillary pressure, which results in water retention behavior in the shale gas reservoirs. these results can provide insights into a better understanding of water sorption behavior in the shale so as to optimize extraction conditions and predict gas productivity in the shale gas reservoirs.

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Section: Isothermal Adsorption Modelmentioning

confidence: 99%

Section: Isothermal Adsorption Modelmentioning

confidence: 99%

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

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“…Analysis of the SEM images in Figure 5 reveals that the single cutting stainless steel fiber has rough surface compared with the bundle-drawing fiber. The nitrogen adsorption method [ 31 ] is used to measure the specific surface area of SCSSFFCs. The specific surface area of the smooth SBDSSFFC is 0.0786 m 2 /g, while the specific surface area of the rough SCSSFFC is 0.2654 m 2 /g, which is approximately 2.4 times larger than that of the SBDSSFFC made by bundle-drawing fiber.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characteristics of Sintered Cutting Stainless Steel Fiber Felt with Internal Channels and an Al2O3 Coating

2018

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A novel sintered cutting stainless steel fiber felt with internal channels (SCSSFFC) composed of a stainless-steel fiber skeleton, three-dimensional interconnected porous structure and multiple circular microchannels is developed. SCSSFFC has a jagged and rough surface morphology and possesses a high specific surface area, which is approximately 2.4 times larger than that of the sintered bundle-drawing stainless steel fiber felt with internal channels (SBDSSFFC) and is expected to enhance adhesive strength. The sol-gel and wet impregnation methods are adopted to prepare SCSSFFC with an Al2O3 coating (SCSSFFC/Al2O3). The adhesive strength of SCSSFFC/Al2O3 is investigated using ultrasonic vibration and thermal shock tests. The experimental results indicate that the weight loss rate of the Al2O3 coating has a 4.2% and 8.42% reduction compared with those of SBDSSFFCs based on ultrasonic vibration and thermal shock tests. In addition, the permeability of SCSSFFC/Al2O3 is investigated based on forced liquid flow tests. The experimental results show that the permeability and inertial coefficients of SCSSFFC/Al2O3 are mainly affected by the coating rate, porosity and open ratio; however, the internal microchannel diameter has little influence. It is also found that SCSSFFC/Al2O3 yields superior permeability, as well as inertial coefficients compared with those of other porous materials reported in the literature.

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“…Using the homogeneous horizontal well model, Babu et al obtained the quasi-steady-state production formula for horizontal wells, which is applicable to horizontal wells in the presence of bottom water or gas-filled rectangular reservoirs [1,2]. Yildiz et al studied the characteristics of perforated wellhead wells in heterogeneous reservoirs and analyzed the variations in law of yield under the quasi-steady state of horizontal wells [3][4][5]. Al-Ahmadi et al introduced a threeporosity model and established an analytical model based on the diffusion equation of the instantaneous source solution.…”

Section: Introductionmentioning

confidence: 99%

GPU-Based Computation of Formation Pressure for Multistage Hydraulically Fractured Horizontal Wells in Tight Oil and Gas Reservoirs

Yin

et al. 2018

Mathematical Problems in Engineering

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A mathematical model for multistage hydraulically fractured horizontal wells (MFHWs) in tight oil and gas reservoirs was derived by considering the variations in the permeability and porosity of tight oil and gas reservoirs that depend on formation pressure and mixed fluid properties and introducing the pseudo-pressure; analytical solutions were presented using the Newman superposition principle. The CPU-GPU asynchronous computing model was designed based on the CUDA platform, and the analytic solution was decomposed into infinite summation and integral forms for parallel computation. Implementation of this algorithm on an Intel i5 4590 CPU and NVIDIA GT 730 GPU demonstrates that computation speed increased by almost 80 times, which meets the requirement for real-time calculation of the formation pressure of MFHWs.

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A new method for analysis of dual pore size distributions in shale using nitrogen adsorption measurements

Cited by 38 publications

References 29 publications

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Fabrication and Characteristics of Sintered Cutting Stainless Steel Fiber Felt with Internal Channels and an Al2O3 Coating

GPU-Based Computation of Formation Pressure for Multistage Hydraulically Fractured Horizontal Wells in Tight Oil and Gas Reservoirs

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