Capturing dynamic behavior of propped and unpropped fractures during flowback and early-time production of shale gas wells using a novel flow-geomechanics coupled model

Jia, Peng; Ma, Ming; Cao, Chong; Cheng, Linsong; Yin, Hengfei; Li, Zhuang

doi:10.1016/j.petrol.2021.109412

Cited by 24 publications

(4 citation statements)

References 19 publications

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“…L is the horizontal length, ft. x is the half of the major axis of the drainage ellipse, Figure 5: Relationship between gas rate and horizontal length in different bottom-hole-pressure. 6 Geofluids ft. y is the half the minor axis of the drainage ellipse, ft. r w is the well radius, ft.…”

Section: Geofluidsmentioning

confidence: 99%

“…No matter directly or indirectly, they are the inputs that needed in the all stages of production performance analysis [1][2][3][4][5]. Reservoir evaluation relies on amount of mathematical solutions of the flow equations for reservoir or well characterization, among which pressure transient analysis and well productivity evaluation are the mostoften-used techniques in the petroleum engineering [6][7][8][9]. The main purpose of pressure transient analysis is to collect the shut-in pressure data under controlled well rate conditions to determine reservoir and fracture parameters and estimate reservoir size [10].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Reservoir Parameters and Well Productivity Based on Production Data: A Field Case in Xinjiang Oilfield, China

Chen¹,

Guo

Li³

et al. 2022

Geofluids

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The understanding of formation has always been a challenge for field development. In this paper, we evaluate the reservoir parameters and gas well productivity based on production data. The model of nonuniform conductivity of fractures in multistage fracturing horizontal wells (MFHW) is used to interpret the transient pressure data. Binomial and exponential deliverability equations and pressure dimensionless productivity formula are combined to evaluate the gas well productivity. After that, the key factors that influence gas well production are analyzed, and the gas rate vs. oil nozzle is presented. Results show that the fracture half-length and conductivity for high- and low-conductivity fractures, respectively, are obtained, apart from the reservoir pressure, permeability, skin factor, etc. The test time in each oil nozzle is recommended to extend to achieve stability and to obtain a more accurate absolute open flow potential. The findings of this study provides a guidance for the production data analysis of nonuniform conductivity of fractures in MFHW in the future work. And it can help for the better understanding of predicting gas production rates in MFHW.

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Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Reservoir Parameters and Well Productivity Based on Production Data: A Field Case in Xinjiang Oilfield, China

Chen¹,

Guo

Li³

et al. 2022

Geofluids

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“…However, there are also views that the retention fluids will form a filtration trap near hydraulic fractures, reducing oil phase permeability, and not conducive to long-term productivity [9,10]. (2) Closure behavior [11] and gravity segregation [12] in fracture system are the key factors. When the fracture propagation patterns are relatively simple, fracture closure is the main driving mechanics of fracturing fluid flowback [13].…”

Section: Introductionmentioning

confidence: 99%

Flowback Characteristics Analysis and Rational Strategy Optimization for Tight Oil Fractured Horizontal Well Pattern in Mahu Sag

Tian,

Liao,

Liu

et al. 2023

Processes

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With the deep development of tight reservoir in Mahu Sag, the trend of rising water cut during flowback concerns engineers, and its control mechanism is not yet clear. For this purpose, the integrated numerical model of horizontal well pattern from fracturing to production was established, and its applicability has been demonstrated. Then the flowback performance from child wells to parent wells and single well to well pattern was simulated, and the optimization method of reasonable flowback strategy was discussed. The results show that the formation pressure coefficient decreases as well patterns were put into production year by year, so that the seepage driving force of the matrix is weakened. The pressure-sensitive reservoir is also accompanied by the decrease of permeability, resulting in the increase of seepage resistance, which is the key factor causing the prolongation of flowback period. With the synchronous fracturing mode of well patterns, the stimulated reservoir volume (SRV) is greatly increased compared with that of single well, which improves the reservoir recovery. However, when the well spacing is less than 200 m, well interference is easy to occur, resulting in the rapid entry and outflow of fracturing fluid, and the increased water cut during flowback. Additionally, the well patterns in target reservoir should adopt a drawdown management after fracturing, with an aggressive flowback in the early stage and a slow flowback in the middle and late stage. With pressure depletion in different development stages, the pressure drop rate should be further slowed down to ensure stable liquid supply from matrix. This research can provide a theoretical guidance for optimizing the flowback strategy of tight oil wells in Mahu sag.

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“…Natural fractures generally develop under the action of multistage structural deformation (Wu et al, 2021a). Natural fracture characterization methods include natural fracture description methods and prediction methods, among which natural fracture characterization methods include qualitative and quantitative description methods, which can be divided into 1) geological methods, including field similar outcrops, core observation, thin slices, scanning electron microscope, CT layer analysis and scanning technology, and core MRI scanning image analysis technology (Xiong et al, 2019;Liu et al, 2020;Wu et al, 2021b;Jia et al, 2021;Rao et al, 2022); 2) well logging methods, including special logging and conventional logging methods (Tang et al, 2012;Zhao et al, 2012;Wu et al, 2021c); 3) reservoir engineering methods, including well test analysis, pressure analysis, tracer analysis, water injection dynamic analysis, and microseismic monitoring (Clarkson and Qanbari, 2015;Fang et al, 2017;Jia et al, 2017;Chen et al, 2019;Li et al, 2020). The prediction methods of natural fractures mainly include the following: 1) The geological data method predicts fractures, mainly based on the geological data such as cores, logging, and seismic data of the oil field to predict the development of fractures.…”

Section: Introductionmentioning

confidence: 99%

The Fractured Model Study of Low-Permeability Reservoir in Xinli Oil Field

2022

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With the development of the petroleum industry, the importance of low-permeability reservoirs becomes clear. The fracture, which serves as the notable characteristic of a low-permeability reservoir, controls the flow system of reservoir fluid and restrains the development effect. Finding ways to recognize the fracture by using the normal data and building the fracture 3-D model are the important and difficult points of low-permeability development. According to this problem, the authors use a helpful probe. First, from similar outcrop and drilling core study of the fractured original model, the knowledge base of the fracture was built. Second, based on the analysis of the principle of dual-later log identification fracture, the core calibration was used to make logging, and using dual-later log, the fracture in wells was recognized. Third, based on the analysis of the principle of the fractal kriging method, the inter-well fractures were predicted. Finally, the 3-D model of fracture was built with fractural random simulation. The result shows that the 3-D model is in accordance with the fact of the development. So, the method is correct.

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Capturing dynamic behavior of propped and unpropped fractures during flowback and early-time production of shale gas wells using a novel flow-geomechanics coupled model

Cited by 24 publications

References 19 publications

Evaluation of Reservoir Parameters and Well Productivity Based on Production Data: A Field Case in Xinjiang Oilfield, China

Evaluation of Reservoir Parameters and Well Productivity Based on Production Data: A Field Case in Xinjiang Oilfield, China

Flowback Characteristics Analysis and Rational Strategy Optimization for Tight Oil Fractured Horizontal Well Pattern in Mahu Sag

The Fractured Model Study of Low-Permeability Reservoir in Xinli Oil Field

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