Production rates and EUR forecasts for interfering parent-parent wells and parent-child wells: Fast analytical solutions and validation with numerical reservoir simulators

Weijermars, Ruud; Tugan, Murat Fatih; Khanal, Aaditya

doi:10.1016/j.petrol.2020.107032

Cited by 16 publications

(35 citation statements)

References 21 publications

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“…The fracture treatment imperfections came to light as follows. Firstly, the general adequacy of the flow cell-based well performance forecasts due to fracture down-spacing was demonstrated in our two prior papers [6,7].…”

Section: Flow-cell Model Results: Fracture Spacing Effectsmentioning

confidence: 93%

“…A reduction in well spacing was simulated by setting the formation boundary equal to the distance to the Inter-well Drainage Boundary (IDB), given by the half-well spacing (y e ). The input parameters used in the model have been described in detail in work by Tugan and Weijermars [5] and Weijermars et al [7]. The new well to type well spacing ratio (W/TW) is given by the new well spacing (W) divided by the original spacing of the type well (TW).…”

Section: Flow-cell Model Results: Well Spacing Effectsmentioning

confidence: 99%

“…The analytical expressions and key equations and parameters used are based on Complex Analysis Methods (CAM) that can provide solutions for fluid flow paths, velocity distribution, time-of-flight contours, and reservoir depletion patterns. The majority of the detailed derivations and benchmarking of results can be found in two prior publications [6,7].…”

Section: Basic Flow-cell Model Descriptionmentioning

confidence: 99%

“…(b) Flow separation surfaces can be distinguished into Interwell Drainage Boundaries (IDB), Transverse Flow Separation Boundaries (TFSB), and Longitudinal Flow Separation Boundaries (LFSB). After [7].…”

Section: Basic Flow-cell Model Descriptionmentioning

confidence: 99%

“…Recent work in our research group has paved the way for accurate pre-drilling DCA-based well performance forecasts based on an analytical flow-cell model [6,7]. The flow-cell based 2-segment DCA uses a type well to scale the production performance of newly planned wells, with the distinctive capacity to fully factor in the effects of changes in well length, fracture spacing, fracture height, fracture half-length, and variable well spacing.…”

Section: Introductionmentioning

confidence: 99%

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Pre-Drilling Production Forecasting of Parent and Child Wells Using a 2-Segment Decline Curve Analysis (DCA) Method Based on an Analytical Flow-Cell Model Scaled by a Single Type Well

Weijermars

Nandlal

2020

Energies

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This paper advances a practical tool for production forecasting, using a 2-segment Decline Curve Analysis (DCA) method, based on an analytical flow-cell model for multi-stage fractured shale wells. The flow-cell model uses a type well and can forecast the production rate and estimated ultimate recovery (EUR) of newly planned wells, accounting for changes in completion design (fracture spacing, height, half-length), total well length, and well spacing. The basic equations for the flow-cell model have been derived in two earlier papers, the first one dedicated to well forecasts with fracture down-spacing, the second one to well performance forecasts when inter-well spacing changes (and for wells drilled at different times, to account for parent-child well interaction). The present paper provides a practical workflow, introduces correction parameters to account for acreage quality and fracture treatment quality. Further adjustments to the flow-cell model based 2-segment DCA method are made after history matching field data and numerical reservoir simulations, which indicate that terminal decline is not exponential (b = 0) but hyperbolic (with 0 < b< 1). The timing for the onset of boundary dominated flow was also better constrained, using inputs from a reservoir simulator. The new 2-segment DCA method is applied to real field data from the Eagle Ford Formation. Among the major insights of our analyses are: (1) fracture down-spacing does not increase the long-term EUR, and (2) fracture down-spacing of real wells does not result in the rate increases predicted by either the flow-cell model based 2-segment DCA (or its matching reservoir simulations) with the assumed perfect fractures in the down-spaced well models. Our conclusion is that real wells with down-spaced fracture clusters, involving up to 5000 perforations, are unlikely to develop successful hydraulic fractures from each cluster. The fracture treatment quality factor (TQF) or failure rate (1-TQF) can be estimated by comparing the actual well performance with the well forecast based on the ideal well model (albeit flow-cell model or reservoir model, both history-matched on the type curve).

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Section: Flow-cell Model Results: Fracture Spacing Effectsmentioning

confidence: 93%

Section: Flow-cell Model Results: Well Spacing Effectsmentioning

confidence: 99%

Section: Basic Flow-cell Model Descriptionmentioning

confidence: 99%

Section: Basic Flow-cell Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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