Well Screen and Optimal Time of Refracturing: A Barnett Shale Well

Tavassoli, Shayan; Yu, Wei; Javadpour, Farzam; Sepehrnoori, Kamy

doi:10.1155/2013/817293

Cited by 24 publications

(39 citation statements)

References 23 publications

(24 reference statements)

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“…We assume that candidate wells for re-fracturing treatment are already selected; in this study, all 50 wells are candidate wells and also the hydraulic re-fractures are placed in the middle of each pair of old hydraulic fractures as it can maximize the production, and also the candidate selection and treatment execution steps are relatively straightforward according to Tavassoli et al (2013). The economic analysis is performed based on 20 years of predicted gas production.…”

Section: Methodology Of Economic Evaluationmentioning

confidence: 99%

“…(2015) 12:553-559 555 simulator are analyzed and the results are used for the NPV and IRR calculation. Increased production by the re-fracturing treatment is incorporated into the analysis by considering the long-term re-fracturing efficiency (LRE) introduced by Tavassoli et al (2013). LRE is assumed equal to 1.3 for all the 50 wells in this study.…”

Section: Methodology Of Economic Evaluationmentioning

confidence: 99%

“…Further, the re-fracturing treatment is applied after 5 years of production as an optimal refracturing time. Also, Tavassoli et al (2013) found that natural gas production achieved its maximum value by placing the hydraulic re-fractures in the middle of each pair of primary hydraulic fractures. Figure 1 shows the effect of re-fracturing placement between each pair of the primary hydraulic fractures.…”

Section: Introductionmentioning

confidence: 98%

“…For Barnett shale, Siebrits et al (2000) reported increased production of natural gas by refracturing treatment. On the selection of candidate wells and time of re-fracturing treatment, researchers such as Craig and Blasingame (2005), Rousell and Sharma (2011), Moore and Ramakrishnan (2006), and Tavassoli et al (2013) discussed and have developed criterion-based approaches. Moreover, the success of a re-fracturing treatment depends on the depleted reservoir pressure and hydraulic fracture geometry (Vincent 2010;Shekar and Hariharan 2011;Wang et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…A robust procedure introduced by Tavassoli et al (2013) is employed in this study, with which all the wells are considered to be good candidates satisfying their criteria. Further, the re-fracturing treatment is applied after 5 years of production as an optimal refracturing time.…”

Section: Introductionmentioning

confidence: 99%

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On the feasibility of re-stimulation of shale wells

2015

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As a result of advances in horizontal completions and multi-stage hydraulic fracturing, the U.S. has been able to economically develop several decades of worth of natural gas. However, a considerable concern has risen on the economic viability of shale gas development for reasons associated with the fast production declines as well as recent down-turns of natural gas prices besides rises in the costs of new technologies. Therefore, an economic analysis is required to investigate the profitability of the refracturing treatment of unconventional gas resources. Net present value of cash flows and internal rate of return are calculated for a range of gas prices considering 20 years of natural gas production from a typical unconventional shale gas reservoir. A systematic comparison is then accomplished for three scenarios: (1) re-fracturing versus no refracturing, (2) combination of re-fracturing and drilling new wells, and (3) time-dependent re-fracturing treatment. Further, this paper incorporates the cost of re-fracturing treatment, the cost of drilling a new horizontal well, the water treatment cost, as well as the current and future price of natural gas in the model. The findings of this work would help the future re-stimulation development plans of the emerging unconventional shale gas plays.

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Section: Methodology Of Economic Evaluationmentioning

confidence: 99%

Section: Methodology Of Economic Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the feasibility of re-stimulation of shale wells

2015

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Optimization models for planning shale gas well refracture treatments

2016

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Refracturing is a promising option for addressing the characteristically steep decline curves of shale gas wells. In this work we propose two optimization models to address the refracturing planning problem. First, we present a continuous‐time nonlinear programming model based on a novel forecast function that predicts pre‐ and post‐treatment productivity declines. Next, we propose a discrete‐time, multi‐period mixed‐integer linear programming (MILP) model that explicitly accounts for the possibility of multiple refracture treatments over the lifespan of a well. In an attempt to reduce solution times to a minimum, we compare three alternative formulations against each other (big‐M formulation, disjunctive formulation using Standard and Compact Hull‐Reformulations) and find that the disjunctive models yield the best computational performance. Finally, we apply the proposed MILP model to two case studies to demonstrate how refracturing can increase the expected recovery of a well and improve its profitability by several hundred thousand USD. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4297–4307, 2016

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Stochastic programming models for optimal shale well development and refracturing planning under uncertainty

2017

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In this work we present an optimization framework for shale gas well development and refracturing planning. This problem is concerned with if and when a new shale gas well should be drilled at a prospective location, and whether or not it should be refractured over its lifespan. We account for exogenous gas price uncertainty and endogenous well performance uncertainty. We propose a mixed‐integer linear, two‐stage stochastic programming model embedded in a moving horizon strategy to dynamically solve the planning problem. A generalized production estimate function is described that predicts the gas production over time depending on how often a well has been refractured, and when exactly it was restimulated last. From a detailed case study, we conclude that early in the life of an active shale well, refracturing makes economic sense even in low‐price environments, whereas additional restimulations only appear to be justified if prices are high. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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Well Screen and Optimal Time of Refracturing: A Barnett Shale Well

Cited by 24 publications

References 23 publications

On the feasibility of re-stimulation of shale wells

On the feasibility of re-stimulation of shale wells

Optimization models for planning shale gas well refracture treatments

Stochastic programming models for optimal shale well development and refracturing planning under uncertainty

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