Estimation of fracture production and water breakthrough locations of multi-stage fractured horizontal wells combining pressure-transient analysis and electrical resistance tomography

He, Youwei; Qin, Jiazheng; Cheng, Shiqing; Chen, Jianwen

doi:10.1016/j.petrol.2020.107479

Cited by 54 publications

(22 citation statements)

References 29 publications

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“…Hydraulic fracturing is related to key parameters including reservoir geomechanics, fracture mechanics, fracture fluids, and fracture design parameters (Guo et al., 2018; Hou et al., 2019; Weng, 2015). Therefore, to evaluate the efficacy of hydraulic fracturing in shale oil reservoirs, it is critical to conduct parametric investigation of relevant parameters so that the quantitative understanding of factors affecting hydraulic fracturing can be improved, and the proper modeling of hydraulic fracture propagation becomes important in this process (He et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

A parametric study of hydraulic fracturing interference between fracture clusters and stages based on numerical modeling

Chen

Guo

et al. 2020

Energy Exploration & Exploitation

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Shale oil reservoirs are usually developed by horizontal wells completed with multi-stage hydraulic fractures. The fracture interference between clusters in a single stage and between consecutive stages has an impact on the stimulation quality in terms of fracture geometries and fracture widths. This study introduces a non-planar hydraulic fracture model based on the extended finite element method and its use in quantifying the effects of relevant parameters on multi-stage fracture quality in a realistic shale oil scenario. The numerical model is validated with field diagnostics based on vertical seismic profiling. Relevant parameters including stress contrast, fracturing fluid viscosity, cluster density, and fracturing in consecutive stages are quantitatively analyzed in the numerical study. Results show that effects of stress contrast on fracture quality are greater than those of fracturing fluid viscosity, while the effects are more significant in outer fractures instead of the inner fracture. Denser cluster design leads to greater inhibition for the growth of inner fractures which eventually divert them transversely. In fracturing for consecutive stages, the opening of fractures in the subsequent stages is inhibited and the fracture geometries are also altered by the inter-stage interference caused by the previous stage. Based on field data and numerical modeling, this study identifies key parameters and quantifies their effects on inter-fracture and inter-stage interference in multi-stage hydraulic fracturing in horizontal wells.

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Section: Introductionmentioning

confidence: 99%

A parametric study of hydraulic fracturing interference between fracture clusters and stages based on numerical modeling

Chen

Guo

et al. 2020

Energy Exploration & Exploitation

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“…However, due to the poor reservoir properties, the oil recovery factor by the primary depletion is usually less than 10% [1][2][3][4]. Advanced horizontal drilling and hydraulic fracturing technologies have obtained economic production of tight formations, but rapid production decline of tight reservoirs is still a major issue [5][6][7]. Gas injection through horizontal wells has become one of the most promising enhanced oil recovery (EOR) methods for tight reservoirs [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of CO2 Huff-n-Puff for Multifractured Horizontal Wells in Tight Oil Reservoirs

Hao

Liao

et al. 2020

Geofluids

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In this paper, the sensitivity factors of CO2 huff-n-puff for multifractured horizontal wells (MFHWs) in tight oil reservoirs were investigated through an experimental test and numerical simulation. The pressure-volume-temperature (PVT) experiment and the slim tube experiment are used to understand the interaction mechanism between CO2 and crude oil, and the minimum miscibility pressure (MMP) of the CO2-crude oil system is 17 MPa. The single-well model was firstly established to analyze the sensitivity factors on production performance of MFHWs by using CO2 huff-n-puff. The controlling factors of CO2 huff-n-puff for MFHWs in tight oil reservoirs were divided into three categories (i.e., reservoir parameters, well parameters, and injection-production parameters), and the impact of individual parameter on well performance was discussed in detail. The range of reservoir parameters suitable for CO2 huff-n-puff of MFHWs is obtained. The reservoir permeability is from 0.1 mD to 1 mD, the reservoir thickness changes from 10 m to 30 m, and the reservoir porosity is from 7% to 12%. Based on the reservoir parameters of the target reservoir, the reasonable well and fracture parameters are obtained. The sensitivity intensity was followed by the horizontal well length, fracture conductivity, fracture spacing, and fracture half-length. CO2 injection-production parameters are further optimized, and the sensitivity intensity was followed by the single-cycle cumulative CO2 injection rate, the soaking time, the injection rates, and the production rates. It provides a reference for parameter optimization of CO2 huff-n-puff for MFHWs in tight oil reservoirs.

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“…At present, the main method to exploit tight oil reservoirs is primary depletion after massive hydraulic fracturing along long horizontal wells, but the primary recovery factor is only 5%~10% [6][7][8][9][10]. Successful development of tight oil reservoirs has been achieved in North America (e.g., Bakken Basin, Permian Basin, and Eagle Ford) by using CO 2 huff-n-puff [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Review on Phase Behavior in Tight Porous Media and Microscopic Flow Mechanism of CO2 Huff-n-Puff in Tight Oil Reservoirs

Tang

Liu

et al. 2020

Geofluids

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The successful development of tight oil reservoirs in the U.S. shows the bright future of unconventional reservoirs. Tight oil reservoirs will be the main target of exploration and development in the future, and CO2 huff-n-puff is one of the most important methods to enhance oil recovery factor of tight oil reservoirs in North America. To improve the performance of CO2 huff-n-puff, injection and production parameters need to be optimized through numerical simulation. The phase behavior and microscopic flow mechanism of CO2 huff-n-puff in porous media need to be further investigated. This paper presents a detailed review of phase behavior and microscopic flow mechanism in tight porous media by CO2 huff-n-puff. Phase behavior in tight porous media is different from that in a PVT cylinder since the capillary pressure in tight porous media reduces the bubble point pressure and increases the miscibility pressure and critical temperature. The condensate pressure in tight porous media and nonequilibrium phase behavior need to be further investigated. The microscopic flow mechanism during CO2 huff-n-puff in tight porous media is complicated, and the impact of molecular diffusion, gas-liquid interaction, and fluid-rock interaction on multiphase flow is significant especially in tight porous media. Nuclear magnetic resonance (NMR) and molecular simulation are efficient methods to describe the microscopic flow in tight oil reservoirs, while the NMR is not cost-effective and molecular simulation needs to be improved to better characterize and model the feature of porous media. The improved molecular simulation is still a feasible method to understand the microscopic flow mechanism of CO2 huff-n-puff in tight oil reservoirs in the near future. The microscopic flow model in micropore network based on digital core is worth to be established, and phase behavior needs to be further incorporated into the microscopic flow model of CO2 huff-n-puff in tight porous media.

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Estimation of fracture production and water breakthrough locations of multi-stage fractured horizontal wells combining pressure-transient analysis and electrical resistance tomography

Cited by 54 publications

References 29 publications

A parametric study of hydraulic fracturing interference between fracture clusters and stages based on numerical modeling

A parametric study of hydraulic fracturing interference between fracture clusters and stages based on numerical modeling

Performance Optimization of CO2 Huff-n-Puff for Multifractured Horizontal Wells in Tight Oil Reservoirs

Review on Phase Behavior in Tight Porous Media and Microscopic Flow Mechanism of CO2 Huff-n-Puff in Tight Oil Reservoirs

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