Residual opening of hydraulic fractures filled with compressible proppant

Neto, Luiz Bortolan; Kotousov, Andrei

doi:10.1016/j.ijrmms.2013.02.012

Cited by 27 publications

(5 citation statements)

References 45 publications

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“…The residual fractures are directly linked to the fracture conductivity and, therefore, represent the main outcome of fracture stimulations. It also significantly affects the productivity of reservoirs and, finally, determines the success of the stimulation procedures (Neto and Kotousov, 2013).…”

Section: Effect Of Fracture Width On Time-dependent Closure Charactermentioning

confidence: 99%

Numerical simulating and benchmarking of waterjet fracturing parameters in coal beds

2015

Acta Geodynamica Et Geomaterialia

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Coal seam fracture stimulation practices indicated that the efficiency of methane drainage is improved initially but reduces thereafter. It is speculated that the contrasts of gas drainage efficiency before and after fracture stimulation may reflect variation of the closure behavior of the fracture created artificially. The work presented herein uses numerical modeling to study the effect of waterjet slotting parameters on the closure behavior of artificial fractures in coal seam. The modeling results indicated that the increase in the methane drainage efficiency due to the fracturing treatment depends upon the closure and residual behavior of fractures, which incorporates with the length, width and distribution of the fractures along the length of borehole and these controllable slotting parameters are directly linked to the fracture conductivity and, therefore, represent the main outcome of fracture stimulations, and significantly affect the success of the stimulation procedures used for the coalbed methane drainage.

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Section: Effect Of Fracture Width On Time-dependent Closure Charactermentioning

confidence: 99%

Numerical simulating and benchmarking of waterjet fracturing parameters in coal beds

2015

Acta Geodynamica Et Geomaterialia

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“…Most scholars often focus on the mechanism of one-layer, multilayer, local support, and other multiproppant overall embedment. − By analyzing the characteristics of proppant deformation, rock mass deformation, and proppant distribution, the numerical value and semianalytical or analytical , equations of proppant embedment are established, and the relationship between the proppant embedment value and closure stress is reasonably analyzed. However, because these models consider that the embedded body is rock, in order to simplify the calculation, it is often considered that the curvature of the surface of the embedded body is zero. − Meanwhile, due to the great difference in strength and rigidity between coal and rock, when proppant is pressed into coal, proppant is easily embedded into coal, resulting in the destruction of coal fracture surface, forming pressure embedded pit and pressure embedded cracks on the surface of coal fracture.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Most scholars often focus on the mechanism of one-layer, multilayer, local support, and other multiproppant overall embedment. 18−21 By analyzing the characteristics of proppant deformation, rock mass deformation, and proppant distribution, the numerical value 22 and semianalytical 23 or analytical 19,24 equations of proppant embedment are established, and the relationship between the proppant embedment value and closure stress is reasonably analyzed. However, because these models consider that the embedded body is rock, in order to simplify the calculation, it is often considered that the curvature of the surface of the embedded body is zero.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Single Proppant Pressure Embedded in Coal Seam Fracture

Huang

Cheng

et al. 2021

Energy Fuels

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The strength and rigidity of proppant and coal are quite different. Proppant is easily embedded in coal, resulting in the decrease of fracture aperture and conductivity. The mechanism of proppant embedded in the coal fracture surface needs further study. In this paper, through theoretical analysis and experimental research of single proppant embedded, the proppant embedded law is analyzed from macro and micro aspects. The damage factor of coal surface is introduced, the damage model of the whole process of single proppant pressure embedded is established, and the mechanism of coal fracture surface embedded pit and cracks is revealed. The results show that, from the center of the contact surface to the outside, the surface failure forms of coal fracture are pressure failure, tensile-shear failure, and tensile failure. The proppant is embedded in the coal fracture surface to form four areas: central compaction area, layered fracture area, fracture development area, and original state area. During the energy release of proppant embedded in coal, the energy of proppant is released first and the energy of coal is released later. Greater than 3 times the contact radius, the influence of single proppant on the coal fracture surface can be ignored.

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“…But, it is difficult to get one product with all these ideal properties. 4 Proppants used in oil industry include sand, glass beads, walnut hulls, and metal shot as well as resin-coated sands, intermediate strength ceramics, and sintered bauxite, which has the ability to effectively withstand the respective reservoir closure stress environment. 5 The relative strength of these various materials increases with their corresponding apparent specific gravity (ASG), typically ranging from 2.65 g/cm 3 for sands to 3.4 g/cm 3 for sintered bauxite.…”

Section: Introductionmentioning

confidence: 99%

Preparation of heat resisting poly(methyl methacrylate)/graphite composite microspheres used as ultra‐lightweight proppants

Chen

Wang

Yan

et al. 2015

J of Applied Polymer Sci

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Ultra-lightweight heat resisting poly(methyl methacrylate) (PMMA)/graphite microspheres were successfully prepared via in situ suspension polymerization. The Fourier transform infrared and X-ray powder diffraction results confirmed the successful preparation of the composite microspheres. Field emission scanning electron microscope analysis illustrated that the graphite particles were dispersed in microspheres and the PMMA/graphite composite microspheres had good sphericity and roundness. Furthermore, density analysis indicated that the apparent density of composites microspheres was about 1.055-1.135g/cm 3 which was suitable for the transmission with water carrying. The results from thermodynamic test revealed that the thermal stability of the composite was significantly improved with increasing graphite content, which could be used as ultra-lightweight proppant in deep underground. In addition, the crushing rate decreased to 0.5% with graphite ratio of 3.0% at the pressure of 69 MPa. Therefore, PMMA/Graphite composite microspheres exhibit a promising application in petroleum or gas exploitation as water carrying fracturing proppants.

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Residual opening of hydraulic fractures filled with compressible proppant

Cited by 27 publications

References 45 publications

Numerical simulating and benchmarking of waterjet fracturing parameters in coal beds

Numerical simulating and benchmarking of waterjet fracturing parameters in coal beds

Mechanism of Single Proppant Pressure Embedded in Coal Seam Fracture

Preparation of heat resisting poly(methyl methacrylate)/graphite composite microspheres used as ultra‐lightweight proppants

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