Has the Economic Stage Count Been Reached in the Bakken Shale?

Baihly, Jason; Altman, Raphael; Aviles, Isaac

doi:10.2118/159683-ms

Cited by 15 publications

(3 citation statements)

References 10 publications

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“…Engineering studies focused on improving well productivity by adjusting well completion design factors. An early study by Baihly et al (2012) examined groups of wells associated with relatively mature fields and concluded the different well groups exhibited a variety of optimal designs. They found, as of the first quarter of 2012, numerous instances where the large number of fracture stages applied to horizontal hydraulically fractured wells could not be justified economically.…”

Section: Previous Studies On Bakken Well Productivitymentioning

confidence: 99%

Growth Drivers of Bakken Oil Well Productivity

Attanasi

Freeman

2019

Nat Resour Res

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This paper identifies the drivers of the phenomenal growth in productivity in hydraulically fractured horizontal oil wells producing from the middle member of the Bakken Formation in North Dakota. The data show a strong underlying spatial component and somewhat weaker temporal component. Drivers of the spatial component are favorable reservoir conditions. The temporal component of well productivity growth is driven by increasing the number of fracture treatments and by increasing the volume of proppant and injection fluids used on a per fracture treatment basis. Random Forest, a nonparametric modeling procedure often applied in the context of machine learning, is used to identify the relative importance of geologic and well completion factors that have driven the growth in Bakken well productivity. The findings of this study suggest that a significant part of the well productivity increases during the period from 2010 to 2015 has been the result of improved well site selection. For the more recent period, that is, from 2015 through 2017, part of the improved well productivity has resulted from substantial increases in the proppant and injection fluids used per stage and per well.

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Section: Previous Studies On Bakken Well Productivitymentioning

confidence: 99%

Growth Drivers of Bakken Oil Well Productivity

Attanasi

Freeman

2019

Nat Resour Res

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“…Although the production is encouraging, intractable problems are also apparent. One of the problems is the fast decline of production in individual producers during depletion development, forcing operators to refracture existing wells or drill new wells [4]. In order to maintain the production rate, it is essential to establish e cient ooding systems for reservoir energy supplement and enhancing oil recovery [5].…”

Section: Introductionmentioning

confidence: 99%

The Characteristics of Oil Occurrence and Long-Distance Transportation due to Injected Fluid in Tight Oil Reservoirs

Liu

Yang

Gao

et al. 2019

Advances in Polymer Technology

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In tight oil reservoirs, the injected fluid needs to travel a long distance to expel oil from the micro/nano-size pores to natural fractures or man-made fractures. The flow characteristics of injected fluid are not known well due to the long distance displacement and complex pore structure. In this study, the tight reservoir samples are from typical tight oilfield of China and the oil distribution characteristics are studied based on mineral composition, physical properties and pore size distribution. The long core displacement experiment is conducted based on injection of water, N2, and CO2, which aims to study the individual flooding feasibility. The results show that the oil mainly distributes in the form of spots and accumulates in the micro/nano-pores. Both oil spots and clay minerals have associated characteristics. The microfractures are not the storage space for oil spots, but can connect the oil spots to improve the mobility of the crude oil. In addition, the oil can achieve long distance migration under the injection of water, N2, and CO2, which presents different pressure distribution characteristics. The reservoir pressure of water flooding decreases first and increases later with displacement time. The reservoir pressure of N2 flooding rises gradually over displacement time. The reservoir pressure of CO2 flooding increases first and decreases over displacement time. In contrast to water flooding, N2, and CO2 can increase the reservoir energy, which contributes to tight oil production. In comparison, CO2 has better performances than N2 in terms of oil displacement efficiency. The study contributes to understanding the oil distribution characteristics and provides the guidance for field trials using different flooding techniques.

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“…We show that each favorable legacy lease held by a private firm leads to a reduction in frontier activity of of 0.25 percentage points, or about 5 percent of the average difference in frontier shares between public and private firms. More-2 Variation in subterranean rock characteristics across shale formations, such as North Dakota's Bakken, gives rise to risks resulting from variation in fracking efficacy, as discussed in Baihly et al (2012), Jabbari, Zeng et al (2012), and Saputelli et al (2014). See also Gilje (2016) for a discussion on exploratory vs. development drilling.…”

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confidence: 99%