Theoretical conductivity analysis of surface modification agent treated proppant

Zhang, Jingchen

doi:10.1016/j.fuel.2014.05.031

Cited by 28 publications

(4 citation statements)

References 18 publications

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“…Xu et al [23], Qu et al [24], and Wen et al [25] used the FCS-100 flowmeter to simulate the conductivity of the channel fracture under different sand concentrations, fiber mass fractions, and 2 Geofluids proppant column diameters (10~32.8 mm), but they did not study the deformation and failure rule of the proppant column. Zhang [26] took into account the influence of proppant embedding, the axial deformation of the proppant column, and its arrangement and derived an analytical model for the fracture width and conductivity of channel fracturing. Zhang and Hou [27] took the axial deformation of the proppant column into consideration and regarded the proppant clusters formed in the high-speed channelfracturing fractures as the seepage zone.…”

Section: Introductionmentioning

confidence: 99%

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

2022

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The nonlinear constitutive model of the proppant column was established through laboratory experiments on the stability of the proppant column. Based on reservoir geomechanics and the finite element method, a fracture-proppant column interaction model was established for high-conductivity channel fracturing. The effects of in situ stress, reservoir rock elastic parameters, and spatial distribution characteristics of the proppant column on the closure deformation of the high-conductivity fracture channel and the stability of the proppant column were studied. The higher the in situ stress, the higher the contact stress on the rock plate; the lower the height and the larger the diameter of the proppant column, the more prone to deformation and breakage, while the more the effective support decreases with the increase of the in situ stress. Under the condition of constant in situ stress, with the increase of the reservoir elastic modulus, the relative axial displacement of the two slabs decreases gradually, the effective propping ratio of fractures increases, and the reservoir elastic modulus has little effect on the stability of the proppant column. The effective propping ratio decreases with the increase of the proppant column diameter, increases with the increase of the proppant column height, and increases with the increase of the ratio of the reservoir elastic modulus to in situ stress. When the proppant column diameter (proppant column spacing) is less than 3 m, the effective propped fracture ratio increases significantly. Through the above research, the optimal proppant cluster diameter was finally optimized.

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Section: Introductionmentioning

confidence: 99%

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

2022

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“…Considering embedment and the axial deformation of proppant pillars, Zhang (2014) and Zhang and Hou (2016) derived an analytical solution of fracture width and conductivity for channel fracturing. Yan et al (2016) developed a fracture-conductivity model for channel fractures using the Darcy-Brinkman equation, assuming that the proppant pillars experience only axial deformation.…”

Section: Introductionmentioning

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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“…This can result in the pressure drop in a large area around borehole, thus gas desorption surface area of coal seam enlarged which guarantees the discharge of coalbed methane rapidly and sustainably. Coalbed methane production of fractured coal seams is 5-20 times of pre-fracturing condition [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of hydraulic fracturing coalbed methane reservoir with independent fracture grid

Zhang

Bian

2015

Fuel

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Theoretical conductivity analysis of surface modification agent treated proppant

Cited by 28 publications

References 18 publications

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

Study on the Deformation and Stability of Proppant Column in High-Conductivity Channel Fracturing

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

Numerical simulation of hydraulic fracturing coalbed methane reservoir with independent fracture grid

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