Well Des gn and Well Spacing Optimisation in Unconventional Plays

Baker, Mark; Mazumder, Saikat; Sharma, Himanshu; Philpot, Jared Anthony; Scott, Marcia S.; Wittemeier, Roxanne

doi:10.2118/159325-ms

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…The only option to mitigate the negative effects of fractures in shale reservoirs is to adopt the H-n-P technique . However, in shale reservoirs, the projected recovery is strictly related to the well design and hydraulic fracture geometry. , H-n-P injection is a widely used strategy that is comparable to the cyclic manner and relies on a fracture system . The Zipper frac strategy, in conjunction with the CO 2 H-n-P procedure, is advised for a more effective gas injection treatment .…”

Section: Introductionmentioning

confidence: 99%

Huff-n-Puff Technology for Enhanced Oil Recovery in Shale/Tight Oil Reservoirs: Progress, Gaps, and Perspectives

et al. 2021

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In recent times, particularly in the 21st century, there has been an alarming increase in the demand for global energy, along with continuous depletion in conventional oil reservoirs. This necessity has incentivized interested scholars and operators worldwide to seek alternative oil resources. To secure such accelerating energy demand, considerable effort has been directed toward the development of previously unconventional oil formations that, in past decades, had remained sidelined. Although shale oil reservoirs have seen tremendous success over the past decade, the continued challenges of rapidly declining oil flow rates and oil retention in the pores continuously persist. Substantial attempts have been made to improve shale-bypassed oil recovery; however, there is little data about the accessibility on recovery mechanisms, especially in the oil field. Furthermore, approachesparticularly, Huff-n-Puff (H-n-P) experiments using conventional proceduresfail to properly represent field conditions and they generate deceptive findings, because the utilized cores are not simulated under realistic reservoir conditions, leaving the significance of critical factors unclear. Therefore, this review study comprehensively and specifically discusses the feasibility of enhanced oil recovery (EOR) methods in unconventional oil reservoirs. Beside addressing the validity of the currently applied H-n-P technology in shale/tight oil reservoirs and underlining some critical gaps regarding laboratory results, modified technology is proposed in this paper for a better field future performance. The study is divided into sections, and each section analyzes the role of one specific H-n-P portion in detail, such as preferable injected solvents, their mechanisms, and critical factors affecting H-n-P recovery. The exceptions to this are the first and second sections, which provide a brief introduction about shale and tight oil reservoirs, a history of applied technology, and the method’s current problem statement. In the Introduction section, the authors will justify why this Review fills a critical gap in the field. Within the assessment study, great focus is given to the H-n-P technique, its parameters, and effective processes. In the final sections, carefully chosen experimental results and tools are reviewed to highlight the controversy and state “the gap”.

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Section: Introductionmentioning

confidence: 99%

Huff-n-Puff Technology for Enhanced Oil Recovery in Shale/Tight Oil Reservoirs: Progress, Gaps, and Perspectives

et al. 2021

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“…This is partially due to the variability in coal seam thickness (Baker, et al, 2012;Kabir, et al, 2011) which is a key input to calculating the initial gas in place (Seidle, 2011).…”

Section: Unconventional Gas Reservoir Uncertaintymentioning

confidence: 99%

Developing synthetic reservoir type curve model for use in evaluating surface facility and gathering pipe network designs

Dennis

2017

Journal of Natural Gas Science and Engineering

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Please cite this article as: Dennis, M., Developing synthetic reservoir type curve model for use in evaluating surface facility and gathering pipe network designs, Journal of Natural Gas Science & Engineering (2017), doi: 10.1016/j.jngse.2017 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractSurface facilities and unconventional gas gathering networks are typically designed to collect gas from a large number of wells to a central location. The unit operations that make up the surface network need to be installed before the wells are producing and thus need to be sized on predicted performance rather than actual performance which is not known until production data is available. This means each reservoir's production profile which is based on uncertain input parameters and imperfect reservoir models forms the sizing basis for the surface facilities.In this study a method is developed to generate synthetic reservoir flow type curves based on a set of input parameters that is independent of reservoir parameters. The main qualitative characteristics of an unconventional gas reservoir type curve are described such as gas ramp to peak, peak gas flow and production decline, along with the discontinuities and variations from expected performance seen in operating trends. The synthetic type curve proposed in this work can be parameterised to mimic these characteristics, along with a well deliverability mechanism and subsurface communication between wells.The method of being able to describe a type curve by means of input parameterisation allows an unconventional gas surface facility of gathering pipe network and in-field booster compressors to be designed against many sets of synthetic type curves rapidly generated by randomisation of those input parameters.

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“…Although further fragmentation of already fragmented landscapes can result from a range of development types, development of unconventional gas resources has recently emerged as a significant fragmenting process and hence as an emerging conservation issue (Brittingham et al 2014;Hobday and McDonald 2014;Souther et al 2014). Optimisation of underground coal-seam gas (CSG) exploitation generally involves a trade-off between interference from adjacent gas boreholes and infrastructure costs, meaning accessing these resources inherently results in high levels of fragmentation (Baker et al 2012). The high degree of fragmentation exists primarily because of the road infrastructure necessary to access the optimally placed boreholes.…”

Section: Introductionmentioning

confidence: 99%

The golden-tailed gecko: a disturbance-tolerant species in a fragmenting environment

2021

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ContextIn central Queensland, Australia, the development of a coal-seam gas (CSG) industry is creating additional fragmentation of landscapes consisting of woodland and open forest that are already highly fragmented. AimsTo assess the response to fragmentation of Strophurus taenicauda (golden-tailed gecko). The species is ‘near threatened’ in Queensland. MethodsOccurrence and abundance were examined across three categories of patch size – small (≤10 ha), medium (10–100 ha) and large (≥100 ha) – across three geographic areas of the species’ range. Minimal impact (i.e. sighting only) active searches for geckos were conducted at night. A minimum of three replicate sites of each patch size category was surveyed in each of the three geographic areas. Eleven additional patches (each <4 ha and located in the southern geographic area) were surveyed to investigate how size and spatial isolation of small patches affected occurrence and abundance of S. taenicauda. At all sites a standardised set of 22 habitat variables was collected, and the presence of other species of arboreal gecko was recorded. Key resultsThe species was located across patches of all sizes, including those as small as 1.11 ha. It was also located opportunistically in the matrix among patches and occurred in isolated trees within an urban area. The abundance of another commonly occurring arboreal gecko, Gehyra dubia (dubious dtella), was negatively correlated with S. taenicauda abundance in small patches. The most important habitat variable for S. taenicauda was average basal area of trees. As this increased, especially above 5.7 m2 ha−1, it was more likely to be present. When considering only the small patches, the main factors influencing presence and abundance of S. taenicauda were the average basal area of Callitris glaucophylla (white cypress) and grazing (negligible or absent). ConclusionsStrophurus taenicauda is a species that is tolerant of disturbance and can persist in fragmented habitat, provided the fragments have adequate cover of white cypress. ImplicationsThe species appears to be resilient to the current level of CSG development within its geographic range.

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Well Des gn and Well Spacing Optimisation in Unconventional Plays

Cited by 10 publications

References 10 publications

Huff-n-Puff Technology for Enhanced Oil Recovery in Shale/Tight Oil Reservoirs: Progress, Gaps, and Perspectives

Huff-n-Puff Technology for Enhanced Oil Recovery in Shale/Tight Oil Reservoirs: Progress, Gaps, and Perspectives

Developing synthetic reservoir type curve model for use in evaluating surface facility and gathering pipe network designs

The golden-tailed gecko: a disturbance-tolerant species in a fragmenting environment

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