Tight Oil Field Development Optimization Based on Experience of Canadian Analogs

Karpov, V. B.; Parshin, Nikolay; Sleptsov, Dmitriy; Moiseenko, A. A.; Ryazanov, Arsentiy Alexeyevich; Golovatskiy, Yury; Petrashov, Oleg V.; Zhirov, A. V.; Kurelenkova, Y. V.; Ishimov, Ivan; Im, Piljae

doi:10.2118/182572-ms

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…Due to the ultralow permeability and the micro-nanoscale pore and throat system, the oil recovery factors for an unconventional reservoir are typically low. Production decline of the wells drilled into low permeability formations is very fast, with 60% or more in the first production year according to reports. , Recovery factor by primary depletion such as solution gas drive without secondary recovery techniques is low and is usually 6–12% of the original oil in place (OOIP). When water injection is applied, the recovery factor may be twice higher, which is about 12–25% and even higher.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Screening, Application, and Perspectives of Surfactant-Based Chemical-Enhanced Oil Recovery Methods in Unconventional Oil Reservoirs

et al. 2023

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Surfactant-based chemical-enhanced oil recovery (EOR) methods have been recognized to be effective in both conventional and unconventional oil reservoirs. However, the nanopore size and low permeability characteristics of unconventional reservoirs hinder the wide application of the chemical EOR methods and have greater requirements for chemical agents. Thorough understanding of the rock−fluid−chemical interactions is the key to production improvement and economy development of unconventional formations. This paper is a systematic review of the literature focused on the performance evaluation and application potential of chemical EOR methods. To address the technical requirement, crucial features of the tight and shale formations and properties of the typically used chemicals are introduced. Many studies in recent decades have revealed that surfactant-based formulations have the capability to increase oil recovery through reducing interfacial tension, altering surface wettability, enhancing aqueous penetration, improving oil mobility, and then promoting spontaneous imbibition. The probable mechanisms of chemical EOR are summarized to demonstrate their potential and to guide the formulation development for reservoirs. Laboratory experiments of chemical screenings are presented to discuss the selection criteria of the appropriate formulation for respective EOR projects. Traditional measurements and novel experimental methods provide a comprehensive understanding of the chemicals corresponding to their application conditions. The outcome of recent pilot field tests in major formations is summarized to show the application feasibility and improvement schemes of chemical EOR. Problems currently existing and possible solutions are discussed to point out future research directions of the related field. Summarizing and analyzing of the problems, challenges, and future respects could help guide the design of chemical EOR projects. This review provides a more comprehensive understanding of the chemical performance in unconventional reservoirs and addresses the significance of appropriate screening methods and sufficient field knowledge for the success of chemical EOR operations.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Review on Screening, Application, and Perspectives of Surfactant-Based Chemical-Enhanced Oil Recovery Methods in Unconventional Oil Reservoirs

et al. 2023

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System Reliability Evaluation for Complex Deep Well Casing Based on Structural Reliability

Fan

Wang

Zhao

et al. 2019

Proceedings of the International Field Exploration and Development Conference 2018

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Improved Hydraulic Fracturing Results Utilizing Microfrac Testing in a West Siberia Field

Karpov¹,

Parshin²,

Ryazanov³

et al. 2017

Day 1 Mon, October 16, 2017

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Identification and quantification of in-situ stress barriers is a crucial part of every hydraulic fracturing design and treatment programme. The absence of stress barriers may lead to significant vertical growth of the fracture, creating a channel between the oil-bearing intervals and potential undesirable water-bearing formations. This paper presents a case study where the in-situ stress profile in a tight oilfield in West Siberia was re-calibrated. The original stress profile, which was based on core analysis, gamma ray and acoustic data, indicated the stress contrast was enough to contain the fracture within the producing layer. Unexpectedly, high water cut between 60 to 70 % was reported in the horizontal wells, where multi-stage hydraulic fracturing was performed and the source of water production was uncertain. Consequently, straddle packer microfrac testing was conducted in one well to create a more detailed and better-constrained stress profile in the target oil-bearing formation as well as in the bounding shale above and below. The data obtained indicated very little stress contrast between the production layer and the surrounding shale layers. The revised stress model differed significantly from what was typically used in West Siberia. The updated hydraulic fracture model showed that excess height growth into the surrounding shale barriers was likely, and breakthrough into the water-bearing layer located 50 to 70 meters above could explain the high observed water cuts in the treated wells. Assuming a uniform stress profile along the lateral, the hydraulic fracture design was then optimized to decrease the risk of breakthrough into the water zone. The optimized treatments involved low-viscosity fracturing fluid and also a reduced amount of proppant per stage used in the treatment. The optimized hydraulic fracture treatment was performed in several horizontal wells, which saw a reduction in the initial water cut to below 10%, and also experienced an increase in oil production. This demonstrates the importance of having reliable stress measurements for hydraulic fracturing design.

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Tight Oil Field Development Optimization Based on Experience of Canadian Analogs

Cited by 5 publications

References 5 publications

A Comprehensive Review on Screening, Application, and Perspectives of Surfactant-Based Chemical-Enhanced Oil Recovery Methods in Unconventional Oil Reservoirs

A Comprehensive Review on Screening, Application, and Perspectives of Surfactant-Based Chemical-Enhanced Oil Recovery Methods in Unconventional Oil Reservoirs

System Reliability Evaluation for Complex Deep Well Casing Based on Structural Reliability

Improved Hydraulic Fracturing Results Utilizing Microfrac Testing in a West Siberia Field

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