A Multi-Linear Fractal Model for Pressure Transient Analysis of Multiple Fractured Horizontal Wells in Tight Oil Reservoirs Including Imbibition

Wang, Zhiyuan; Yang, Zhengming; Ding, Yunhong; He, Ying; Lin, Wei; Wang, Wendong; Sheng, Guanglong

doi:10.1142/s0218348x19400048

Cited by 10 publications

(5 citation statements)

References 49 publications

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“…Previous fractal studies on the pore structure of tight oil and shale gas reservoirs show that they have good fractal characteristics (Lin et al 2017(Lin et al , 2018Wang et al 2019). To quantitatively characterize the heterogeneity of shale reservoirs, we used fractal theory to quantitatively characterize the microscopic heterogeneity of shale oil and tight sandstone reservoirs.…”

Section: Fractal Characteristics Of Micro-nano-pores In Shale Oil Resmentioning

confidence: 99%

Characteristics of micro- and nano-pores in shale oil reservoirs

Xia

Yang

Gao

et al. 2020

J Petrol Explor Prod Technol

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Porosity is the most common form of reservoirs, and its size, shape, and connectivity directly affect the capacity of oil and gas storage and production. To study the micro–nano-pore structure characteristics of shale oil reservoirs and quantitatively characterize its heterogeneity, this work uses high-precision high-pressure mercury intrusion (HPMI) experimental techniques to study the micro–nano-pore structure characteristics of shale oil, and based on the experimental data, fractal theory is used to quantitatively characterize its heterogeneity. The results of the study show that the micro–nano-pores in the shale oil reservoir are concentrated and continuous, and the pore radius is mainly distributed among the range of 30–500 nm, nanoscale pores are an important part of the pores of the shale oil reservoir. The fractal dimension of the shale oil reservoir is larger than the fractal dimension of typical tight oil reservoirs, indicating that the heterogeneity of shale oil reservoir is stronger. The research results have some theoretical and practical significance for the production of inter-salt shale oil reservoirs.

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Section: Fractal Characteristics Of Micro-nano-pores In Shale Oil Resmentioning

confidence: 99%

Characteristics of micro- and nano-pores in shale oil reservoirs

Xia

Yang

Gao

et al. 2020

J Petrol Explor Prod Technol

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“…Also, Wang et al (2015aWang et al ( , 2015b introduced fractal theory into the tri-linear model to represent the stimulated region in multi-staged horizontal wells and analyzed the properties of the stimulated region on the PTA curve. Wang et al (2019) coupled the fractal theory with the fivelinear model (Stalgorova and Mattar, 2013) to study the imbibition effect on production performance of the multi-staged horizontal well.…”

Section: Introductionmentioning

confidence: 99%

Pressure transient analysis for multi-wing fractured vertical well in coalbed methane reservoir based on fractal geometry and fractional calculus

Zhang

et al. 2022

Energy Exploration & Exploitation

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In this paper, a semi-analytical mathematical model of pressure transient analysis (PTA) for multi-wing fractured vertical well (MWFV) in coalbed methane (CBM) reservoir is proposed, which considers the complexity of porous media by fractal geometry, the anomalous diffusion based on fractional calculus and the stress sensitivity represented by the exponential expression. Then through line source theory, dimensionless transformation, Pedrosa transformation, and other methods, the solution of the bottom hole pressure is obtained. At last, the PTA curve is presented by the Stehfest inversion method, and seven flowing regimes are identified. It can be observed that after introducing fractal geometry and fractional calculus, the PTA curve is quite different from the traditional curve in the slope of the derivative curve. The influences of related parameters are discussed, including mass fractal dimension, anomalous diffusion coefficient, number of hydraulic fractures, fracture angle, and stress sensitivity factor. Relevant results can provide better guidance to understand the CBM production performance in MWFV.

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“…The development of tight reservoirs has become the key role in the progress of enhancing national energy source security and realizing energy selfsufficiency. The tight oil and gas reservoirs are characterized by low permeability, poor pore throat structure, and no natural production [4][5][6]. The conventional development method can barely achieve profitability and thus requires volume fracturing which refers to the generation of fracture network by artificial approaches, improving the reservoir seepage capacity and the contact area between the fracture and the reservoir [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of the Vertical Well Hydraulic Fracturing Effect Based on Production Data

Xia

Yang

et al. 2021

Geofluids

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Hydraulic fracturing technology has become a key technology for the development of low-permeability/tight oil and gas reservoirs. The evaluation on the postfracturing effect is imperative to the formulation and implementation of the fracturing and development plan. Based on the characteristics of the flow in fracture network after a large-scale hydraulic fracturing, a numerical method for evaluating the effect of fracturing in vertical well was established. This study conducts postfracturing effect evaluations to block C Oilfield’s wells that underwent conventional fracturing and volumetric fracturing, respectively, proposes the definition of fracture network conductivity and its relationship with cumulative production, and analyzes the fracturing construction parameters. The results suggest that the conventional fracturing can only form a single fracture instead of a stimulated reservoir volume (SRV) region. However, the volumetric fracturing transformation can form a complex fracture network system and SRV region and meanwhile bring obvious increase in the production. The effective time lasts for a longer period, and the increase of average daily oil is 2.2 times more than that of conventional fracturing. Additionally, with the progress of the production, the SRV area within the core region of the volume transformation gradually decreased from 6664.84 m2 to 4414.45 m2; the SRV area of the outer region decreased from 7913.5 m2 to 5391.3 m2. As the progress develops, the equivalent permeability and the area of the fracture gradually decrease as the fracturing effect gradually weakens, and so does the conductivity of the network decreasing exponentially; a good correlation is observed between the conductivity of the fracture network, the cumulative production, and fracturing construction parameters, which can serve as the evaluation parameters for the fracturing effects and the basis for fracturing productivity prediction and provide a guidance for fracturing optimization design.

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A Multi-Linear Fractal Model for Pressure Transient Analysis of Multiple Fractured Horizontal Wells in Tight Oil Reservoirs Including Imbibition

Cited by 10 publications

References 49 publications

Characteristics of micro- and nano-pores in shale oil reservoirs

Characteristics of micro- and nano-pores in shale oil reservoirs

Pressure transient analysis for multi-wing fractured vertical well in coalbed methane reservoir based on fractal geometry and fractional calculus

Evaluation Method of the Vertical Well Hydraulic Fracturing Effect Based on Production Data

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