A multi-linear transient pressure model for multistage fractured horizontal well in tight oil reservoirs with considering threshold pressure gradient and stress sensitivity

Wu, Zhongwei; Cui, Chuanzhi; Lv, Guojun; Bing, Shaoxian; Cao, Gang

doi:10.1016/j.petrol.2018.08.078

Cited by 70 publications

(49 citation statements)

References 17 publications

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“…The theoretical basis of pressure transient data analysis can be found in numerous references [19][20][21]. Modern computer software packages available for pressure transient and production data analyses include F.A.S.T.…”

Section: Transient Pressure Analysis For Fracture Interference Identimentioning

confidence: 99%

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Yang

Guo

2019

Energies

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A data-driven workflow approach is presented in this study for optimizing fracture spacing of multifractured horizontal wells (MFHW) in shale oil reservoirs. The workflow employs a simple well productivity model for the initial design of hydraulic fracturing well completions. This provides a transparent approach to the identification of key fracturing parameters affecting well productivity. The workflow uses transient pressure or production data to identify fracture interference. This offers a reliable and cost-effective means for assessment of well production potential in terms of optimization of fracture spacing in the MFHW. Result of a field case study indicated that three wells were drilled in an area with dense natural fractures, and the fracture spacing of MFHW in this area was short enough to effectively drain the stimulated reservoir volume (SRV), while the other three wells were drilled in an area with less natural fractures, and the fracture spacing of MFHW in this area could be shortened to double well productivity.

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Section: Transient Pressure Analysis For Fracture Interference Identimentioning

confidence: 99%

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Yang

Guo

2019

Energies

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“…As mentioned above, previous models have not taken the stress sensitivity and the SRV into consideration, simultaneously, some simplifications need to be imposed in order to validate our model with the previous ones. Wu et al (2019) have established a pressure analysis model for multi-fractured horizontal wells in homogeneous and stress-sensitive reservoirs. Further analysis of the proposed model in this work reveals that if we do not subdivide the inner SRV subsections, our model can be simplified to be a four-linear flow model and the solution for multi-fractured horizontal wells in homogeneous and stresssensitive reservoirs can be obtained.…”

Section: Model Verificationmentioning

confidence: 99%

“…Further analysis of the proposed model in this work reveals that if we do not subdivide the inner SRV subsections, our model can be simplified to be a four-linear flow model and the solution for multi-fractured horizontal wells in homogeneous and stresssensitive reservoirs can be obtained. To verify the correctness of our model, comparison is made with the model proposed by Wu et al (2019). The case is a fractured horizontal well with 5 fractures perpendicular to wellbore in stress-sensitive tight gas reservoirs as shown in Figure 1.…”

Section: Model Verificationmentioning

confidence: 99%

Transient Pressure Analysis for Multi-Fractured Horizontal Well with the Use of Multi-Linear Flow Model in Stress Sensitive Shale Gas Reservoir

Wang¹,

Jia²,

Wei³

et al. 2019

Preprint

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Shale gas reservoirs (SGR) are important replacements for conventional energy resources and have been widely exploited by hydraulic fracturing technologies. On the one hand, due to the inherent ultra-low 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 bring huge challenges in SGR transient pressure analysis. Although some works in the literatures have been done on the transient pressure analysis of multi-fractured horizontal wells in SGR, unfortunately, none of them has taken the stress sensitivity and spatially varying permeability of SRV zone into consideration simultaneously. To fill this gap, this paper first idealizes the SGR to be four linear composite regions. What’s more, SRV zone is further divided into sub-sections on the basis of non-uniform distribution of proppant within SRV zone which easily yields spatially varying permeability away from the main hydraulic fracture. The stress sensitivity is characterized by the varying permeability depended on the pore pressure. By means of perturbation transformation and Laplace transformation, an analytical multi-linear flow model (MLFM) is obtained and validated by the comparison with the previous model. On the basis of our model, the flow regimes are identified and the sensitivity analysis of critical parameters are conducted to further understand the transient pressure behaviors. The research results provided by this work are of significance for well test interpretation and production performance analysis of SGR.

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“…For VWSF technology, there has been significant research in the fields of petroleum and shale gas, and the design of hydraulic fracturing parameters for vertical wells has matured. [29][30][31][32][33] The application of VWSF for petroleum and shale gas is different from that in the presence of HHRs. The main purpose of VWSF for HHRs in coal mines is to control the SGPB in the stopes.…”

Section: Introductionmentioning

confidence: 99%

Determination of the key parameters of high‐position hard roofs for vertical‐well stratified fracturing to release strong ground pressure behavior in extra‐thick coal seam mining

Pan

Xia

et al. 2020

Energy Science & Engineering

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Traditional methods of controlling hard roofs have a limited scope of action and cannot effectively release the strong ground pressure behavior (SGPB) induced by high-position hard roofs (HHRs) in extra-thick coal seam mining (ETCSM). Thus, an innovative control technology of fracturing HHRs by vertical-well stratified fracturing (VWSF) has been proposed. However, the key parameters of VWSF, namely fracturing horizon and fracturing thickness of HHRs, which have a significant influence on stope stability, remain uncertain. In this study, a mechanical model of the "coal wall-hydraulic support-gangue" support system is established by considering the effective loading acting on HHRs, through which modified expressions for the periodic breaking span and impact kinetic energy of the stope are deduced. Based on the self-bearing of bulking rocks, the stability principle of the surrounding rock, and energy dissipation theories, the criteria for determining the fracturing horizon and thickness of the HHR are obtained. Next, a numerical model of ETCSM, which accounts for the supporting effect of gangue, is constructed in FLAC3D. The support load and energy released by stratum breakage are determined through modeling under various hard roof parameters, thus verifying the correctness of the determination criteria. The results show that the energy released by a hard roof, average support load, and critical support load are positively correlated with thickness, and first increase before declining with respect to an increase in the fracturing horizon.The key parameters for a real coal mine are obtained by theoretical calculations and numerical simulations. A field application demonstrates that the support load and advance roadway deformation can be decreased using the proposed parameterization. This provides theoretical support for determining the key parameters of HHRs for VWSF and facilitates the widespread application of VWSF technology in HHR control. K E Y W O R D Shigh-position hard roofs, microseismic monitoring, mine safety, strong ground pressure behavior, vertical-well stratified fracturing | 2217 PAN et Al.

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A multi-linear transient pressure model for multistage fractured horizontal well in tight oil reservoirs with considering threshold pressure gradient and stress sensitivity

Cited by 70 publications

References 17 publications

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

A Data-Driven Workflow Approach to Optimization of Fracture Spacing in Multi-Fractured Shale Oil Wells

Transient Pressure Analysis for Multi-Fractured Horizontal Well with the Use of Multi-Linear Flow Model in Stress Sensitive Shale Gas Reservoir

Determination of the key parameters of high‐position hard roofs for vertical‐well stratified fracturing to release strong ground pressure behavior in extra‐thick coal seam mining

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