Channel Fracturing Technique Helps to Revitalize Brown Fields in Langepas Area

Valiullin, A. S.; Makienko, Vladimir; Yudin, Alexey; Overin, Alexandr; Gromovenko, Alexander

doi:10.2118/178131-ms

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Note that for simplification, the deformation of a proppant pillar and the stress applied on it are assumed to be uniform. In reality, the stress on the outer portion of the proppant pillar could be larger than that on the inner portion; as a result, larger deformation of the proppant pillar will occur near the pillar circumference, whereas smaller deformation will be at the center of the pillar (Wang and Elsworth 2018). Fig.…”

Section: Parameter-sensitivity Analysismentioning

confidence: 99%

Modeling of Fracture Width and Conductivity in Channel Fracturing With Nonlinear Proppant-Pillar Deformation

et al. 2019

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Channel fracturing acknowledges that there will be local concentrations of proppant that generate high-conductivity channel networks within a hydraulic fracture. These concentrations of proppant form pillars that maintain aperture. The mechanical properties of these proppant pillars and the reservoir rock are important factors affecting conductivity. In this paper, the nonlinear stress/strain relationship of proppant pillars is first determined using experimental results. A predictive model for fracture width and conductivity is developed when unpropped, highly conductive channels are generated during the stimulation. This model considers the combined effects of pillar and fracture-surface deformation, as well as proppant embedment. The influence of the geomechanical parameters related to the formation and the operational parameters of the stimulation are analyzed using the proposed model. The results of this work indicate the following: 1. Proppant pillars clearly exhibit compaction in response to applied closure stress, and the resulting axial and radial deformation should not be ignored in the prediction of fracture conductivity. 2. There is an optimal ratio (approximately 0.6 to 0.7) of pillar diameter to pillar distance that results in a maximum hydraulic conductivity regardless of pillar diameter. 3. The critical ratio of rock modulus to closure stress currently used in the industry to evaluate the applicability of a channelfracturing technique is quite conservative. 4. The operational parameters of fracturing jobs should also be considered in the evaluation. Conventional Channel fracturing Fig. 1-Schematic of (left) conventional fracturing and (right) channel fracturing (Gillard et al. 2010).

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Section: Parameter-sensitivity Analysismentioning

confidence: 99%

Modeling of Fracture Width and Conductivity in Channel Fracturing With Nonlinear Proppant-Pillar Deformation

et al. 2019

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“…The KGD method tends to bea better representative of cases where the fracture length is equal to or less than its height. Such fracture conditions are mainly applicable to brownfields applications where fracturing is used to revive production [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Novel Equivalent Continuum Approach for Modelling Hydraulic Fractures

2020

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Hydraulic fracturing has transitioned into widespread use over the last few decades. There are a variety of numerical methods available to simulate hydraulic fracturing. However, most current methods require a large number of input parameters, of which the values of some parameters are poorly constrained. This paper proposes a new method of modelling the hydraulically fractured region using void-ratio dependent relation to define the permeability of the fractured region. This approach is computationally efficient and reduces the number of input parameters. By implementing this method with an equivalent continuum representation, uncertainties are reduced arising from heterogeneity and anisotropy of earth materials. The computational efficiency improves modelling performance in stress sensitive zones such as in the vicinity of the injection well or near faults.

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Advancements of Fracturing Technique Implementation to Jurassic Formations of Uvat Region

et al. 2016

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To provide designed oil production and to minimize non-productive time new approaches in hydraulic fracturing have been tried and introduced for several years in Uvat project. During this optimization process, several new technologies were pilot tested including fiber-laden fluid, rod-shaped proppant and channel fracturing technique. The main goal was to improve fracturing fluid reliability and to decrease the risk of premature screen-outs in combination with more aggressive fracturing design to maximize oil production. Uvat project oil field is located in Western Siberia. Jurassic formation is the main oil producer from the field, presented by significant net height (up to 45 m), relatively high permeability which varies in wide range from 2 md to more than 50 mD. The formation temperature is 80-90°C. The requirements to fracture geometry is gradually increase in these conditions. The greater fracture width must be accompanied with sufficient effective fracture half-length. This goal cannot be achieved with standard hydraulic fracturing techniques because of limitations in proppant pack conductivity. Besides, the more aggressive design is associated with the higher risk of premature job screen-out that consequently results in non-productive time. Paper describes the results of pilot projects for the following new technologies introduction: fibers that allow better proppant distribution in the fracture and decrease polymer concentration without sacrificing proppant transportation ability of the fluid (the new generation of fibers was implemented which is for low temperature formation); rod-shaped proppant to prevent particles flowback and to increase fracture conductivity; channel fracturing technology that allows to decrease treatment costs and risk of premature screen-out while keeping or even increasing the flow capacity of the fracture. In channel fracturing application a proppant is added in short pulses alternated with clean fluid pulses. This becomes even more vital in remote locations as the same stimulation result can be achieved with less proppant amount replaced by clean fluid pulses that leads to decrease in spending on logistics and time optimization for fracturing job. The manuscript describes the candidate selection methods for re-fracturing jobs and states the main success criteria (such as presence of formation energy and current skin calculation). The authors represent comparative analysis of horizontal wells and multistage fracturing effectiveness in low productive regions resulted in high incremental oil rate when compared to vertical wells with a single fracture.

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Channel Fracturing Technique Helps to Revitalize Brown Fields in Langepas Area

Cited by 7 publications

References 13 publications

Modeling of Fracture Width and Conductivity in Channel Fracturing With Nonlinear Proppant-Pillar Deformation

Modeling of Fracture Width and Conductivity in Channel Fracturing With Nonlinear Proppant-Pillar Deformation

A Novel Equivalent Continuum Approach for Modelling Hydraulic Fractures

Advancements of Fracturing Technique Implementation to Jurassic Formations of Uvat Region

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