· The primary factor impacting the tight sandstone reservoirs and fluid flow capacity represents the pore-throat structure. On the basis of petrophysical characteristics test, scanning electron microscopy (SEM), and casting thin-section examination of tight sandstone reservoir specimens from the Permian Lucaogou Formation in Jimsar Sag,
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· Phillips et al. (2015) conducted core-scale MICP experiments and plugged several sandstone and shale cores, all of which showed a 3–5 order of magnitude reduction in permeability. Wu et al. (2017) conducted four sets of blocking experiments and demonstrated that MICP was more durable than traditional biomass and extracellular
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: Salima Baraka-Lokmane, Salima Baraka-Lokmane, I. Main, B.T. Ngwenya, S. Elphick · In combination with physical properties of the sandstone cores and the variations of the driving force during the imbibition process, imbibition characteristics of
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The results show that: the nanofluid can greatly reduce the interfacial tension of oil phase and improve the efficiency of imbibition and oil discharge, the higher the concentration,
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· In this work, these tight sandstones samples were used to analyze the characteristics of BPFs and HAFs, the porosity and air permeability of cores, and were selected for thin sections. More than 200 pieces of ordinary, cast, and fluorescent thin sections were made by mechanical polishing perpendicular to laminae or parallel to
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For this purpose, long cores on the Su 6 block of Sulige tight sandstone gas field in China were selected, and a multipoint embedded measurement system was established to study the
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· 1 School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China 2 School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China * [email protected] Abstract CO 2 flooding is an economical and efficient enhanced oil recovery technology, however, it is difficult for conventional short core experiments to
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· The sandstone samples used in our experiments were obtained from the Yanchang sandstone oil well cores in Huaziping County, Yan'an, south-eastern Ordos Basin (Fig. 1 (a)) (Li et al., 2022b). The samples used were primarily composed of grey and light grey medium-fine feldspathic sandstones without significant bedding development.
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· Diagenesis is a series of physical and chemical reactions that take place after deposition. Using cores, thin sections, cathode luminescence, X-ray diffraction, scanning electron microscope, inclusions analysis, geochemical analysis and pore permeability data, the diagenesis, and its influence on the tight sandstone reservoir of
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· We selected two tight sandstone wellbore cores 10 cm in diameter and ∼15 cm in length (labeled Z7 and Z2) An investigation of the effect of wettability on NMR characteristics of sandstone rock and fluid systems J.
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· Zongquan Hu, Herong Zheng, Wei Yin, Chunyan Liu, Chuanxiang Sun, Christopher Xiao, Fubin Wang, Song Li, Chunfang Chen; Comparison of diagenetic characteristics and pore evolution in outcrops and cores of tight sandstone reservoirs in the Triassic Yanchang Formation, the Ordos Basin, China.
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· The cores were saturated with crude oil at a 0.5 mL/min rate until the core produced only crude oil, and NMR T 2 mappings and online NMR imaging were performed. Next, the pressure of the manual pump was adjusted to 17 MPa, CO 2 with an average mass of 0.4469 g was injected and the well was braised for 24 h.
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· Hydraulic fracturing is an important method of reservoir stimulation in the exploitation of geothermal resources, and conventional and unconventional oil and gas resources. In this article, hydraulic fracturing experiments with shale, sandstone cores (from southern Sichuan Basin), and granite cores (from Inner Mongolia) were conducted
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· N 2 GA experiment have correlations with multifractal characteristics. For the core samples with the similar specific value of sandstone core 53 and other shale samples varies from − 0.12
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· However, an intensive research of microscopic pore throat characteristics is still relatively rare for ultra-low permeability sandstone reservoir (0.1mD < K < 1.0 mD).Our innovation in materials, ultra-low permeability sandstone is
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· Pradhan et al. [7] investigated stress-induced fracturing in sandstone and limestone cores by acoustic monitoring and μCT image analysis. Chitrala [8] studied the hydraulic fracture propagation in Lyons sandstone under different stress condition through the analyzation of the acoustic emission (AE) data.
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· The basic performance of a novel high-efficiency spontaneous imbibition agent (SXJ-2) was investigated in this study. The mechanisms of spontaneous imbibition and wettability reversal of an oil-wet sandstone surface (OSS) by SXJ-2 were studied by infrared (IR) analysis, scanning electron microscopy (SEM), zeta potential determination,
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· Abstract. Based on field conducts, it is found that a lower flowback rate results in a higher oil recovery in a tight sandstone reservoir. Spontaneous imbibition, as a main mechanism of oil production increment for this phenomenon, has been paid more and more attention. The aim of this study is to explain the spontaneous imbibition in tight
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This method was used to carry out sandstone core imbibition experiment in nanofluid, and the oil migration images in the entire process were recorded. In combination with physical properties of the sandstone cores and the variations of the driving force during the imbibition process, imbibition characteristics of the sandstone cores with different
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· The best sandstone formations for gas accumulation are those with a greater number of larger pores and uniform small pores. In the formations without developed micro-fracture, large pores (>50 μm) and small pores
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· As the water injected during hydraulic fracturing is imbibed and then displaced in the matrix of tight reservoirs, it is meaningful to characterize the fluid distributions and percolation dynamics during these two processes as they significantly affect production. In this study, 6 tight sandstone cores from the Chinese Ordos Basin
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· The results show that: the nanofluid can greatly reduce the interfacial tension of oil phase and improve the efficiency of imbibition and oil discharge, the higher the concentration, the lower the interfacial tension and the higher the efficiency of imbibition
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DOI: 10.1016/s1876-3804(22)60031-4 Corpus ID: 247054749 Imbibition characteristics of sandstone cores with different permeabilities in nanofluids @article{Qiu2022ImbibitionCO, title={Imbibition characteristics of sandstone cores with different permeabilities in nanofluids}, author={Rundong Qiu and Chunyuan Gu and Peiyu Xue and Dongxing Xu
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· In this study, 6 tight sandstone cores from the Chinese Ordos Basin were selected to experimentally study the fluid seepage and distributions during spontaneous imbibition and drainage using a low
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Download Table | Characteristics of the tight oil sandstone core samples. from publication: Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance | Given the
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· It is of great importance to study the CO 2-oil two-phase flow characteristic and displacement front behavior in porous media, for understanding the mechanisms of CO 2 enhanced oil recovery. In this work, we carried out near miscible CO 2 flooding experiments in decane saturated synthetic sandstone cores to investigate the
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· Characteristics of the water distribution and film thickness within pores control CO 2 transport and determine the effectiveness of geologic storage. Although studies of adsorbed water films on solid surfaces are abundant, reports about the dependence of CO 2 transport behavior on film thickness under geologic CO 2 storage conditions are
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· To verify whether the reconstructed virtual sandstone can reflect the pore distribution characteristics of real sandstone, three sandstone CT digital cores with obvious differences in pore distribution characteristics were obtained. Figure 5 shows the comparison of pore distribution characteristics in the CT digital cores of real
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· DOI: 10.1016/J.IJHEATMASSTRANSFER.2017.12.013 Corpus ID: 126124316 MRI study on CO2 capillary trap and drainage behavior in sandstone cores under geological storage temperature and pressure The two‐phase flow characterization (CO2/water) of a
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· Based on physical properties of cores, capillary pressure curves of high-pressure mercury injection, parameters related to pore throat characteristics and NMR T 2 spectrum, the pore structure characteristics of cores taken from Penglaizhen Fm tight sandstone reservoirs are divided into three types (Fig. 2).
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