Transient pressure behavior of multi-stage fractured horizontal wells in stress-sensitive tight oil reservoirs

Ren, Zongxiao; Wu, Xiaodong; Han, Guoqing; Liu, Lingyan; Wu, Xiaojun; Zhang, Guanghui; Lin, Haifei; Zhang, Jiaming; Zhang, Xianwei

doi:10.1016/j.petrol.2017.07.073

Cited by 27 publications

(7 citation statements)

References 12 publications

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“…After obtaining the solutions in Zone IV, the equations for Zone II and Zone III should be coupled together to simultaneously obtain the analytical solutions. After substituting Equation (39) to Equations (17) and (27), the effects of Zone IV can be incorporated into Zone II and Zone III:…”

Section: Geofluidsmentioning

confidence: 99%

“…According to source functions, Jiang et al [15] analyzed pressure and gas rate transient laws of a multistage fractured horizontal well for tight oil reservoirs while considering SRV, although the fractures were still confined to be vertical to the wellbore and the stress sensitivity was also ignored in their study. Zongxiao et al [16,17] amalgamated the perturbation technique with a linear source function method to consider the effect of stress sensitivity when they researched transient pressure behaviors of horizontal wells. However, the com-plexity of fracture networks was still neglected.…”

Section: Introductionmentioning

confidence: 99%

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Transient Pressure Analysis for Multifractured Horizontal Well with the Use of Multilinear Flow Model in Shale Gas Reservoir

et al. 2020

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Shale gas reservoirs (SGR) have been a central supply of carbon hydrogen energy consumption and hence widely produced with the assistance of advanced hydraulic fracturing technologies. On the one hand, due to the inherent ultralow permeability and porosity, there is stress sensitivity in the reservoirs generally. On the other hand, hydraulic fractures and the stimulated reservoir volume (SRV) generated by the massive hydraulic fracturing operation have contrast properties with the original reservoirs. These two phenomena pose huge challenges in SGR transient pressure analysis. Limited works have been done to take the stress sensitivity and spatially varying permeability of the SRV zone into consideration simultaneously. This paper first idealizes the SGR to be four linear composite regions. What is more, the SRV zone is further divided into subsections on the basis of nonuniform distribution of proppant within the SRV zone which easily yields spatially varying permeability away from the main hydraulic fracture. By means of perturbation transformation and Laplace transformation, an analytical multilinear flow model (MLFM) is obtained and validated as a comparison with the previous models. The flow regimes are identified, and the sensitivity analysis of critical parameters is conducted to further understand the transient pressure behaviors. The research results provided by this work are of significance for an effective recovery of SGR resources.

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Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient Pressure Analysis for Multifractured Horizontal Well with the Use of Multilinear Flow Model in Shale Gas Reservoir

et al. 2020

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“…Zongxiao et al 31 have established a pressure analysis model for multiple fractured horizontal wells (MFHWs) in homogeneous and stress-sensitive reservoirs. Further analysis of the proposed model in this work reveals that if we make the inner SRV has the same physical properties with the outer region, the solution for MFHWs in homogeneous and stress-sensitive reservoirs can be obtained.…”

Section: Model Verificationmentioning

confidence: 99%

“…Further analysis of the proposed model in this work reveals that if we make the inner SRV has the same physical properties with the outer region, the solution for MFHWs in homogeneous and stress-sensitive reservoirs can be obtained. To verify the correctness of our model, comparison is made with the model proposed by Zongxiao et al The case is a fractured horizontal well with 5 fractures perpendicular to wellbore in stress-sensitive tight oil reservoirs as shown in Figure . The other parameters used for simulation are listed in Table .…”

Section: Model Verificationmentioning

confidence: 99%

Transient Pressure Analysis of Volume-Fractured Horizontal Wells Considering Complex Fracture Networks and Stress Sensitivity in Tight Reservoirs

Han

et al. 2019

ACS Omega

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Tight reservoirs, as an important alternative for conventional energy resources, have been successfully exploited with the aid of hydraulic fracturing technologies. Because of the inherent ultralow permeability and porosity, tight oil reservoirs generally suffer from the effects of stress sensitivity. Both hydraulic fractures with complex geometries and a high-permeability area known as stimulated reservoir volume (SRV) may be generated by the massive hydraulic fracturing operations. All these bring huge challenges in transient pressure analysis of tight reservoirs. Up till now, although many research studies have been carried out on the transient pressure analysis of volume-fractured horizontal wells in tight reservoirs, unfortunately, there is still a lack of research studies that have taken stress sensitivity, complex fracture networks, and the SRV into consideration, simultaneously. To fill up this gap, this paper first idealizes the reservoir after hydraulic fracturing as two radial composite regions, that is, the unstimulated outer region and the inner SRV. The stress sensitivity is characterized by the variable permeability depending on the pore pressure. A linear source with consideration of the stress sensitivity in the composite reservoir is obtained by the perturbation technique, Laplace transformation, and the flow coupling of two regions. Second, the complex fracture networks are discretized into segments to capture their geometries. A semi-analytical model is finally established and validated by the comparison with previous models. On the basis of our model, six flow stages of volume-fractured horizontal well are identified and special features of each regime are analyzed. The stress sensitivity has a great impact on the later stage of production. The mobility ratio and the SRV radius mainly affect SRV pseudo-steady-state flow period and interporosity flow period in the outer region. Fracture number mainly affects the linear flow in the SRV. Fracture geometries mainly affect linear flow and interporosity flow in the SRV. This study has some significance for well test interpretation and production performance analysis of tight reservoirs.

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“…In addition, as unconventional oil and gas resources are explored and developed, (semi)analytical solution, numerical simulation techniques are being developed to make the pressure and rate analysis (also known as PTA, RTA) with stress sensitivity [19][20][21]. However, few models have been reported considering the synthetical impact of sand migration and stress sensitivity [22][23][24][25]. Reference [26] established a bizonal radial composite model considering the effect of stress sensitivity and sand production.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Investigation on Well Performance Integrated Stress Sensitivity and Sand Production

et al. 2021

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For unconsolidated sanding wells, the interaction between sanding and pressure-dependent permeability as oil is produced from the bottom of the well puts higher challenges on the evaluation and prediction of well performance. Therefore, it is essential to assess the oil well performance considering the synthetic effect of stress-sensitive and produced sand particles. In this paper, a new stress-sensitive factor is proposed to describe the relationship between stress and permeability in the numerical model. Also, based on the rectangular plastic region by the sand migration near the perforation, a quantitative expression of the sanding area for numerical model calculation was established. Combined with a quantitative description of these two key parameters, a sand-producing horizontal well model is established to evaluate production performance. In this model, the area of sand production near the wellbore is considered as the inner area with increased permeability while the outer zone remains the original reservoir. Besides, the model was verified by the production data from the sand-producing horizontal well in the oilfield. Furthermore, sensitivity parameters (such as stress sensitivity, the size of sanding zone, well location, and reservoir boundaries) are used to make the analysis of well productivity, which provides a theoretical basis for petroleum engineers to adjust the development plan for horizontal wells in the weakly consolidated sandstone reservoir.

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Transient pressure behavior of multi-stage fractured horizontal wells in stress-sensitive tight oil reservoirs

Cited by 27 publications

References 12 publications

Transient Pressure Analysis for Multifractured Horizontal Well with the Use of Multilinear Flow Model in Shale Gas Reservoir

Transient Pressure Analysis for Multifractured Horizontal Well with the Use of Multilinear Flow Model in Shale Gas Reservoir

Transient Pressure Analysis of Volume-Fractured Horizontal Wells Considering Complex Fracture Networks and Stress Sensitivity in Tight Reservoirs

Numerical Simulation Investigation on Well Performance Integrated Stress Sensitivity and Sand Production

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