Posteriori assessment of fracture propagation in refractured vertical oil wells by pressure transient analysis

Shan, Liqun; Guo, Boyun; Weng, Dingwei; Liu, Zhe; Chu, Henry

doi:10.1016/j.petrol.2018.05.010

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…(3) A refracture that is orthogonal to the initial fracture can most significantly increase the low-pressure area of the refracture system, thus leading to the best performance of the refracturing treatment among different refracture azimuths (4) A longer refracture length is more favorable for improving the well productivity. However, the length of the reoriented section can exert a more noticeable effect on the well performance than the length of the initially oriented section (5) The refracturing treatment can lead to a higher increase of the cumulative production for the scenario of low initial fracture permeability. A higher permeability of the refracture can induce higher cumulative production…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the refracture can be divided into three sections, including a reorientated section (red line in Figure 1), a transition section (yellow line in Figure 1), and an initially orientated section (blue line in Figure 1). Shan et al provided a pressure transient analysis model to posterior assess the fracture propagation of refractured vertical well in oil reservoir [5]. Yi and Sharma proposed a new method to calculate slurry distribution among multiple fractures during the fracturing treatment and refracturing treatment [6].…”

Section: Introductionmentioning

confidence: 99%

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Performance Prediction of Refractured Wells Based on Embedded Discrete-Fracture Modeling Method

Cao

Teng

2022

Geofluids

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In unconventional reservoirs, the production rate of the initially fractured well will decrease rapidly as the development proceeds. In order to maintain economic well productivity of the initial fracture, the industries can create refractures to prevent the well production rate from decreasing. However, the production of the initial fracture can induce the stress field to reorientate, which will cause the refracture to propagate along a different direction from the initial fracture. Thus, the refracturing treatment can result in a complex fracture system which raises a stringent challenge for one to evaluate the performance of the refractured well. In this paper, the authors utilize the embedded discrete fracture model (EDFM) to characterize the performance of the refractured wells. The calculated results in this paper show that, for the same equivalent matrix permeability, a larger permeability component parallel to the initial fracture can lead to a higher increase ratio of the refracturing treatment but lower cumulative production. If the reoriented section of the refracture is orthogonal to the initial fracture, the productivity of the refracture system can be the highest. The length of the reoriented section plays a more important role than the length of the initially oriented section in influencing the refracturing treatment. The refracturing treatment can lead to a higher increase of cumulative production if the initial fracture has a lower permeability.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Prediction of Refractured Wells Based on Embedded Discrete-Fracture Modeling Method

Cao

Teng

2022

Geofluids

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“…WellTest [22] and PanSystem [23]. Applications of the pressure transient data analysis theory to shale gas and oil wells are shown by a number of investigators such as Shan et al [24], Pang et al [25], and He et al [26]. Figure 2 presents a diagnostic plot of pressure transient data for flow regime identification where the vertical axis is the pressure derivative defined by:…”

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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“…Mathematical models for reservoir linear flow were given by several investigators including Gringarten et al 19 and Cinco et al 20 A fracture‐reservoir bilinear flow model was presented by Cinco and Samaniego 21 . The pseudo‐steady flow model for multi‐fractured horizontal wells was developed by Li et al 22 A pseudo‐steady flow model for high‐energy gas‐fractured wells was given by Li et al 23 A pseudo‐steady flow model for re‐fractured wells was presented by Shan et al 24 However, none of these models applies to wells with horizontal fractures.…”

Section: Introductionmentioning

confidence: 99%

A transient flow solution to describe fluid flow to horizontal fractures applied to frac‐packed wells

Guo

Liu

2021

Energy Science & Engineering

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This paper presents an analytical model to describe the transient fluid flow to a horizontal fracture in frac‐packed vertical wells. A physical model is first established where a horizontal frac‐packed fracture is located in the middle of a cylindrical reservoir. The pressure distribution in the fracture is then derived concerning time and the distance to the wellbore. The analytical model assumes a homogeneous and isotropic reservoir where Darcy's law applies to a single‐phase fluid flow, a radial fracture with a radius much greater than pay zone thickness, and a constant fracture width. For ease of application, a Type Curve Matching approach is introduced which features the matching of a defined dimensionless pressure between field pressure data and model data, and some exemplar curves are illustrated in this paper. The principle of applying curve matching here is to tune model parameters to match the measured pressure/rate data. Once the curves are matched, the model parameters, that is, fracture permeability, etc, are naturally obtained. The validity of the derived model is informed in two ways. The results show that the model will degenerate to the classic radial flow equation for practical values of certain model parameters and upon reasonable simplification. Model validity is further verified by applying the type curve matching technique using field data. This model can be used as a quick and reasonable method to analyze the transient pressure/rate test data to reveal fundamental fracture and reservoir properties for a frac‐packed horizontal fracture at shallow depths where the vertical formation stress is the least in situ stress.

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Posteriori assessment of fracture propagation in refractured vertical oil wells by pressure transient analysis

Cited by 10 publications

References 8 publications

Performance Prediction of Refractured Wells Based on Embedded Discrete-Fracture Modeling Method

Performance Prediction of Refractured Wells Based on Embedded Discrete-Fracture Modeling Method

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

A transient flow solution to describe fluid flow to horizontal fractures applied to frac‐packed wells

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