Evaluation of stress changes due to multi-stage hydraulic fracturing – Consideration of field results

Nagel, N.B.; Zhang, F.; Sanchez-Nagel, Marisela; Lee, B.

doi:10.1201/b15683-162

Cited by 6 publications

(3 citation statements)

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“…As previous field observations [16][17][18] and numerical studies [19][20][21] showed, multistage hydraulic fractures might not propagate uniformly, yet planar and biwing fractures are assumed in the model. The hydraulic fractures described in the reservoir model implies hydraulically induced and also propped fractures which indeed contribute fluid production of stimulated wells.…”

Section: 2mentioning

confidence: 95%

“…(i) A two-well pad model forms a symmetry when it extends to one section that no-flow boundary condition is imposed between two-well pad models. This allows us to only simulate a part of one section to evaluate the entire section (ii) Change in well spacing might result in different fracture geometries and conductivities because of the stress shadow effect and connection with natural fractures [9,19]. However, we assume that fracture geometry and conductivity are the same as the history-matched model which is originally 660 ft well spacing (iii) All of the wells in the section are assumed to be completed and start producing at the same time for the NPV calculation.…”

Section: Lateral Spacing Sensitivitymentioning

confidence: 99%

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Stimulated Reservoir Volume Characterization and Optimum Lateral Well Spacing Study of Two-Well Pad: Midland Basin Case Study

Park

Janova²

2020

Geofluids

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This paper introduces a flow simulation-based reservoir modeling study of a two-well pad with long production history and identical completion parameters in the Midland Basin. The study includes building geologic model, history matching, well performance prediction, and finding optimum lateral well spacing in terms of oil volume and economic metrics. The reservoir model was constructed based on a geologic model, integrating well logs, and core data near the target area. Next, a sensitivity analysis was performed on the reservoir simulation model to better understand influential parameters on simulation results. The following history matching was conducted with the satisfactory quality, less than 10% of global error, and after the model calibration ranges of history matching parameters have substantially reduced. The population-based history matching algorithm provides the ensemble of the history-matched model, and the top 50 history-matched models were selected to predict the range of Estimate Ultimate Recovery (EUR), showing that P50 of oil EUR is within the acceptable range of the deterministic EUR estimates. With the best history-matched model, we investigated lateral well spacing sensitivity of the pad in terms of the maximum recovery volume and economic benefit. The results show that, given the current completion design, the well spacing tighter than the current practice in the area is less effective regarding the oil volume recovery. However, economic metrics suggest that the additional monetary value can be realized with 150% of current development assumption. The presented workflow provides a systematic approach to find the optimum lateral well spacing in terms of volume and economic metrics per one section given economic assumptions, and the workflow can be readily repeated to evaluate spacing optimization in other acreage.

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Section: 2mentioning

confidence: 95%

Section: Lateral Spacing Sensitivitymentioning

confidence: 99%

Stimulated Reservoir Volume Characterization and Optimum Lateral Well Spacing Study of Two-Well Pad: Midland Basin Case Study

Park

Janova²

2020

Geofluids

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“…After completion of the first stage, the second fracture is observed to grow discretely, mainly vertically apart from the first fracture. Conversely, the third fracture is attracted towards the second fracture due to the stress shadowing effect, a mechanical phenomenon that is widely accepted (Nagel et al 2013b). The third fracture ultimately interacts with and contributes to further extension of the second fracture.…”

Section: Multi-stage Hydraulic Fracture Simulationmentioning

confidence: 99%

Three-dimensional Voronoi-based distinct element model for simulation of hydraulic fracture propagation

Ghazvinian¹,

Kalenchuk²

2017

Proceedings of the International Conference on Deep and High Stress Mining

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Hydraulic fracturing is a complex physical process which involves the coupling of hydraulic and mechanical behaviours as well as, in some cases, temperature effects. The interdependence of these various factors is complex, and cannot be fully captured by the relatively simple state-of-practice tools employed in investigations of hydraulic fracturing. In this paper, a new approach is presented for fully coupled hydro-mechanical simulation of hydraulic fracture propagation by using three-dimensional Voronoi geometries within the context of distinct element formulation. The block boundaries formed by the Voronoi tessellation, providing a random flow pathway for the fluid and the contact breakage due to the increase of the fluid pressure acting on them, replicate the hydraulic fracture propagation. While the Voronoi approach for hydraulic fracturing simulation has been implemented previously in 2D models, this work puts forward a technique for extension of its application to 3D models. A series of verification tests are performed to investigate the suitability of the proposed approach. Finally, example applications are presented for simulation of single-stage and multi-stage hydraulic fracturing of intact rock by using the 3D Voronoi models at large scale.

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On multistage hydraulic fracturing in tight gas reservoirs: Montney Formation, Alberta, Canada

Vishkai

Gates

2019

Journal of Petroleum Science and Engineering

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Evaluation of stress changes due to multi-stage hydraulic fracturing – Consideration of field results

Cited by 6 publications

References 0 publications

Stimulated Reservoir Volume Characterization and Optimum Lateral Well Spacing Study of Two-Well Pad: Midland Basin Case Study

Stimulated Reservoir Volume Characterization and Optimum Lateral Well Spacing Study of Two-Well Pad: Midland Basin Case Study

Three-dimensional Voronoi-based distinct element model for simulation of hydraulic fracture propagation

On multistage hydraulic fracturing in tight gas reservoirs: Montney Formation, Alberta, Canada

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