Experimental evaluations of nano high-viscosity friction reducers to improve acid fracturing efficiency in low-permeability carbonate reservoirs

Wang, Qing; Zhou, Fujian; Su, Hang; Zhang, Siyu; Dong, Rencheng; Yang, Dandan; Wang, Yunjin; Chen, Zhangxin; Li, Junjian

doi:10.1016/j.cej.2024.149358

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…Unlike low-permeability reservoirs, high-permeability reservoirs [1,2] respond better to vibrational influence. This is due to the better spread of vibration in the reservoir.…”

Section: Discussion Of Results Of Investigating Vibrating Wave Swabbi...mentioning

confidence: 99%

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Determining the effect of vibrating wave swabbing on the functional processes in carbonate low-permeability reservoirs

Rubel,

Surzhko

et al. 2024

EEJET

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This paper investigates the method of vibrating wave swabbing, which is used to stimulate the flow of liquid to the well. This method is known to generate mechanical waves in the soil that open microcracks and pores, increasing the flow of hydrocarbons. A carbonate reservoir with low permeability, which is quite common in the oil and gas industry, was considered as the study object. Therefore, the object of research was carbonate low-permeability reservoirs. After all, their low permeability makes the extraction of oil and gas from them a difficult task. As a result of processing, it was established that increasing the amplitude of pressure fluctuations contributes to increasing the efficiency of the vibration wave action, as the permeability of the reservoir increases more intensively, which was confirmed by the coefficient of determination, which was R2=0.92. And an increase in the frequency of oscillations, on the contrary, reduces it, because the depth of the effective zone of vibrational action decreases; in this case, the coefficient of determination was R2=0.81. To study the effect, a laboratory setup was designed that included a plunger device that generated fluid perturbations in a conditional borehole. The resulting elastic waves were measured by a manual contact vibrometer. Vibrating wave swabbing is a promising method for intensifying hydrocarbon production. The influence under investigation could be implemented in oil and gas fields with carbonate low-permeability reservoirs. This would lead to an increase in fluid production and improved efficiency of the oil and gas industry

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“…Unlike low-permeability reservoirs, high-permeability reservoirs [1,2] respond better to vibrational influence. This is due to the better spread of vibration in the reservoir.…”

Section: Discussion Of Results Of Investigating Vibrating Wave Swabbi...mentioning

confidence: 99%

“…In experiments [2] with loams, vibration waves can be a useful tool for studying its various properties, such as density, viscosity, and elasticity. The objective difficulties analyzed in [3] associated with the change in vibration may indicate the presence of pores in the material under study.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the effect of vibrating wave swabbing on the functional processes in carbonate low-permeability reservoirs

Rubel,

Surzhko

et al. 2024

EEJET

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“…Their notable low permeability and intricate pore formations characterize these reservoirs; tight gas reservoirs exhibit poor gas mobility, resulting in the low efficiency of traditional oil and gas extraction techniques in tight reservoir development [4][5][6][7]. Hydraulic fracturing technology, which fractures reservoir rocks with high-pressure fluids to increase rock permeability, enabling gas to flow and be effectively extracted, is a key technology for developing tight gas reservoirs [8][9][10][11]. Inherent water saturation exists within tight sandstone deposits, and the process of fracturing introduces substantial water volumes into these deposits.…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Behavior of Gas and Water in Fractured Tight Gas Reservoirs Considering Matrix Imbibition Using the Digital Core Method

Chen,

Duan,

Wang

2024

Processes

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Tight gas reservoirs possess unique pore structures and fluid flow mechanisms. Delving into the flow and imbibition mechanisms of water in fractured tight gas reservoirs is crucial for understanding and enhancing the development efficiency of such reservoirs. The flow of water in fractured tight gas reservoirs encompasses the flow within fractures and the imbibition flow within the matrix. However, conventional methods typically separate these two types of flow for study, failing to accurately reflect the true flow characteristics of water. In this study, micro-CT imaging techniques were utilized to evaluate the impact of matrix absorption and to examine water movement in fractured tight gas deposits. Water flooding experiments were conducted on tight sandstone cores with different fracture morphologies. Micro-CT scanning was performed on the cores after water injection and subsequent static conditions, simulating the process of water displacement gas in fractures and the displacement of gas in matrix pores by water through imbibition under reservoir conditions. Changes in gas–water distribution within fractures were observed, and the impact of fracture morphology on water displacement recovery was analyzed. Additionally, the recovery rates of fractures and matrix imbibition at different displacement stages were studied, along with the depth of water infiltration into the matrix along fracture walls. The insights gained from this investigation enhance our comprehension of the dynamics of fluid movement within tight gas deposits, laying a scientific foundation for crafting targeted development plans and boosting operational efficiency in such environments.

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Research on optimization of conductivity of multilevel fractures in tight sandstone based on similar circuit principle

Xiao,

Zhang,

Xiang

et al. 2024

Energy Science & Engineering

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Volume fracturing technology is commonly used to develop tight sandstone reservoirs. During the fracturing process, it is important to not only focus on achieving a larger stimulation volume but also on creating a fracture network conductivity that is suitable for the tight reservoir. However, while there have been numerous studies on optimizing the conductivity of individual fractures, the optimization of fracture network conductivity is still incomplete. To address this issue, a reservoir numerical model is established to optimize the equivalent conductivity of the post‐fracturing fracture network, considering it as a high permeability zone, optimizing the equivalent conductivity to 9.7 μm2 cm. Utilizing the discrete element theory, a “pipe domain” discrete element model is developed to analyze fracture expansion. The findings indicate that the ratios of first‐level, second‐level, and third‐level fractures differ based on the number of clusters, such as 1:4:8 and 1:5:9 for three‐cluster and four‐cluster perforations. By applying the hydropower similarity principle, the fracture network is treated as a three‐level circuit to determine the conductivity of each fracture level. Finally, the model is fitted based on conductivity to determine the optimal fracture conductivity for different fracture number ratios, thereby enhancing the flow capability.

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Experimental evaluations of nano high-viscosity friction reducers to improve acid fracturing efficiency in low-permeability carbonate reservoirs

Cited by 7 publications

References 39 publications

Determining the effect of vibrating wave swabbing on the functional processes in carbonate low-permeability reservoirs

Determining the effect of vibrating wave swabbing on the functional processes in carbonate low-permeability reservoirs

Study on the Flow Behavior of Gas and Water in Fractured Tight Gas Reservoirs Considering Matrix Imbibition Using the Digital Core Method

Research on optimization of conductivity of multilevel fractures in tight sandstone based on similar circuit principle

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