Preparation and Evaluation of Artificial Cores of Unconsolidated Sandstone Considering the Effect of Formation Water

Gui-qin, Wang; Xu, Hai; Wu, Liang; Yang, Yong Su

doi:10.1007/s13369-020-04974-w

Cited by 9 publications

(3 citation statements)

References 10 publications

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“…Unconsolidated sandstone reservoirs have shallow burial depths, poor cementation, large differences in reservoir petrophysical properties, complex pore throat structures, strong heterogeneity, and easy formation of favorable zones for oil and gas production and storage. , However, with the progress of oilfield production operations, the drag force of the reservoir fluid on the rock skeleton particles increases, resulting in obvious sand production in the reservoir. , Sand production in unconsolidated sandstone reservoirs results in lower rock strength. Meanwhile, the permeability is reduced, the microscopic pore throats are blocked by sand particles, and the dominant seepage channel for crude oil is reduced. − Improving single-well productivity under the premise of effective sand control is the key to the development of unconsolidated sandstone reservoirs. Fan et al believed that fracturing and packing technology can effectively control sand and increase production by changing the migration state of oil and water .…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the permeability is reduced, the microscopic pore throats are blocked by sand particles, and the dominant seepage channel for crude oil is reduced. 5 − 8 Improving single-well productivity under the premise of effective sand control is the key to the development of unconsolidated sandstone reservoirs. Fan et al believed that fracturing and packing technology can effectively control sand and increase production by changing the migration state of oil and water.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Sand Production Damage in Unconsolidated Sandstone Reservoirs on Pore Structure Characteristics and Oil Recovery at the Microscopic Scale

Luo²,

Yu³

et al. 2022

ACS Omega

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Unconsolidated sandstone reservoirs have low rock strength and are easily damaged by sand production. To evaluate the effect of the microscopic pore system on the degree of recovery and sand production damage, five typical unconsolidated sandstone core samples were selected. The nuclear magnetic resonance T 2 spectrum of the water-flooding experiments was used to analyze the oil displacement mechanism and sand production damage of the pore throat structure, and the control mechanism of the injection parameters was used to evaluate the recovery and sand production damage degree. The results showed that the recovery of the unconsolidated sandstone core samples was the highest when the injection volume was 6 PV, and the overall pore throat recovery increased from 14.37 to 48.72%. The recovery and sand production damage increased with increasing injection pressure. The overall pore throat recovery was the highest when the pressure was 20 MPa (48.42%), and the sand production damage index was the maximum when the pressure was 25 MPa (19.98%). Under a lower injection pressure, sand production damage mainly originates from loose sand. The main target of loose sand production damage is a smaller pore throat, and the sand production index increases slowly. The recovery increased with the pressure and increased relatively quickly. Under a higher injection pressure, sand production damage mainly comes from loose sand and skeleton sand, causing damage to both smaller and larger pore throats. The sand production damage is positively correlated with injection pressure. The recovery slows down with an increase in pressure or even decreases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Sand Production Damage in Unconsolidated Sandstone Reservoirs on Pore Structure Characteristics and Oil Recovery at the Microscopic Scale

Luo²,

Yu³

et al. 2022

ACS Omega

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“…The primary uranium deposits in China are sandstonetype, granite type, and silicate type, of which 43% are sandstone-type. It is difficult to obtain cores in sandstone strata which is loose, fragile, poor, or has no cementation [8][9][10][11][12]. At present, there are many coring barrels for loose sandstone-type uranium deposits.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Experimental Study on the Insulation Layer Thickness of a Novel Ice Coring Device in Loose Sandstone-Type Uranium Deposits

Huang

Peng

et al. 2021

Energies

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The target strata of sandstone-type uranium deposits are usually located in the fragile and loose strata, which makes it difficult to obtain core samples; consequently, a novel ice coring device for loose sandstone-type uranium deposits is proposed to solve this problem. Experiments proved that the artificial sample can replace the natural sample, and the coring method has high reliability. Ensuring the allegro formation of an ice valve with a given cold source is critical for this coring system, and reducing the loss of cold energy with help of insulation layer is one of the methods to speed up the formation of ice valve. Since the diameter of the drill tool is limited by its working scenario, the thickness of insulation layer is limited to ensure the size of core. Therefore, this paper conducted laboratory experiments of the insulation layer with different thicknesses to study the effect of the insulation layer on the formation of the sand–ice valve. Results show that the insulation layer can reduce the loss of cold energy during the freezing process and significantly affect the formation time of the sand–ice valve. When the thickness of the aerogel insulation layer is 2 mm, the freezing time is 44% shorter than that without insulation layer. According to the tests, the novel ice coring device is expected to solve the coring problem in loose sandstone-type uranium deposits.

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Experimental Research of Remaining Oil Distribution for Inverted Nine-Sport Pattern and Infill Well Pattern

Wang

Cao

et al. 2021

Arab J Sci Eng

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Preparation and Evaluation of Artificial Cores of Unconsolidated Sandstone Considering the Effect of Formation Water

Cited by 9 publications

References 10 publications

Influence of Sand Production Damage in Unconsolidated Sandstone Reservoirs on Pore Structure Characteristics and Oil Recovery at the Microscopic Scale

Influence of Sand Production Damage in Unconsolidated Sandstone Reservoirs on Pore Structure Characteristics and Oil Recovery at the Microscopic Scale

Experimental Study on the Insulation Layer Thickness of a Novel Ice Coring Device in Loose Sandstone-Type Uranium Deposits

Experimental Research of Remaining Oil Distribution for Inverted Nine-Sport Pattern and Infill Well Pattern

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