Pressure-Transient Behavior of Partially Penetrating Inclined Fractures With a Finite Conductivity

Teng, Bailu; Li, Huazhou

doi:10.2118/194189-pa

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Dinh and Tiab [18] developed a fully penetrating inclined fracture model based on uniform flux and infinite conductivity. Teng and Li [19] divided fracture into small panels, each used as a panel source. On this basis, they developed a semianalytical model of a finite-conductivity partially penetrating inclined fracture and distinguished the flow regimes.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

Jin

Xing

et al. 2022

Lithosphere

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Fluid flow is strongly affected by fractures in unconventional reservoirs. It is essential to deeply understand the flow characteristics with fractures for improving the production and efficiency of unconventional reservoir exploitation. The purpose of this work is to develop an accurate numerical model to evaluate the transient-pressure response for well intersecting fractures. The meshes generated from Fullbore Formation Micro-Imager (FMI) images ensure an efficient numerical description of the geometries for fractures and interlayers. The numerical simulation is implemented by an inhouse finite element method-based code and benchmarked with drill stem test (DST) data. The results show that three flow regimes appear in the reservoir with fractures within the test period: wellbore afterflow, pseudolinear flow, and radial flow. In contrast, only the wellbore afterflow and radial flow appear for the wells without fractures. The results also reveal that fractures dominate the flow near the wellbore. Verification and application of the model show the practicability of the integrated approach for investigating the transient-pressure behaviors in the unconventional reservoir.

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Section: Introductionmentioning

confidence: 99%

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

Jin

Xing

et al. 2022

Lithosphere

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“…Using conventional logging data to accurately identify and predict fractures in the entire well section requires maximum use of drilling core and imaging logging data to calibrate conventional logging data. At present, the main technologies for predicting fractures through seismic methods include coherence analysis technology, tracking technology, seismic inversion technology, and shear wave splitting technology (Wang et al, 2014;Su et al, 2017;Teng and Li, 2019). 2) The numerical simulation method is used to predict 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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“…To character the conductivity and geometry of fractures, discrete fracture network method was introduced. The flux and geometry can be considered by changing the parameters of discrete elements [13]. This method makes it easier to character the geometry of fractures and is a better way to analysis the partially penetrating inclined fractures.…”

Section: Introductionmentioning

confidence: 99%

A semi-analytical model for pressure transient analysis of partially penetrating inclined fracture networks for multi-stage fractured horizontal well

Zhikai¹,

Wang²,

Cheng³

et al. 2022

Preprint

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There are some partially penetrating inclined fractures (PPIFs) due to stress interference between fracture networks in multi-stage fractured horizontal wells (MFHWs). It would take tremendous computation time to make flow behavior analysis and well production optimization in numerical simulators. Therefore, it is an extremely urgent task to establish efficient and rigorous models of PPIF networks. In this paper, triangular elements were introduced to characterize the geometry and intersection of PPIFs. Control volume method is adopted to model the fracture flow numerically and the star-delta transformation is used to solve the interconnected fractures more accurately. The fluid flow in the matrix is analytical modeled by source function. The transient flow between PPIFs and matrix is coupled on the surface of fractures. By introduce spatial triangle numerical integral technology in source function calculation, the model efficiency can be greatly increased. Finally, the pressure transient analysis (PTA) of PPIFs can be modelled with high accuracy and less calculation time. With the aid of proposed PPIFs model, the transient pressure behaviors of different MFHWs were analyzed. The hydraulic and natural fractures in these MFHWs have different inclinations, trends, and heights. The flow regimes of PPIFs with finite conductivity are analyzed in detail. Flow regimes analysis indicates that eight flow regimes can be observed, including the wellbore storage flow, fracture linear flow, bilinear flow, formation linear flow, early radial flow, compound linear flow, pseudo-radial flow, and boundary-dominated flow. The results indicate that the formation linear flow and early radial flow would be influenced by the geometry of nature fractures, which is quite different from that of vertical penetration fractures. The introduction of numerical integral method greatly reduces the calculation time (less than 2 minutes) with high accuracy, which make it possible to analysis the fracture parameters more efficiently. The result of typical well test curves analyses shows that the duration of flow regimes will be influenced the parameters of fractures. When the penetration ratio (> 0.6) or the incline angle (>60°) is large enough, the bilinear flow will last longer, and the early radial flow will be absent.

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Pressure-Transient Behavior of Partially Penetrating Inclined Fractures With a Finite Conductivity

Cited by 11 publications

References 2 publications

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

An Integrated Approach of Numerical Well Test for Well Intersecting Fractures Based on FMI Image

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

A semi-analytical model for pressure transient analysis of partially penetrating inclined fracture networks for multi-stage fractured horizontal well

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