Experimental study on shale fracturing effect and fracture mechanism under different fracturing fluid viscosity: A case study of Guanyinqiao Member shale in Xishui, Guizhou, China

Zhang, Shuhui; Li, Xiao; Gao, Quanchen

doi:10.1063/1.5131791

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…It is most suitable for wells in low and moderate permeability reservoirs. Fractures created require proppant to keep it open after the injection has stopped, and the conductivity depends on the proppant distribution in the fracture [3] . Cipolla et al [4] studied the effect of proppant distribution in the fracture network on good performance and showed that proppant distribution signi cantly affects the fracture network conductivity and treatment design.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic sand test and analysis based on sound emission data and fracture surface

Zhang¹

2023

Preprint

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Due to the extremely low permeability of shale reservoirs, large-scale reservoir fracturing is required. Hydraulic fracturing is one of the most important technologies in shale gas exploration and development. In this paper, the acoustic emission energy and the number of location and fracture surface morphology of specimens before and after fracture are studied through hydraulic sand fracturing test. The test results show that: (1) the energy ratio obtained during hydraulic fracturing without proppant is the smallest, and increasing the confining pressure, as well as reducing the displacement and viscosity of the fracturing fluid will cause the energy ratio to decrease. From the perspective of acoustic emission energy, the proppant It plays an important role in the generation of fractures during hydraulic sand fracturing; (2) when the confining pressure increases, the number of shale specimens before and after rupture is the largest, but the total number of locating events is smaller than when the sanding ratio is increased; when there is no proppant hydraulic fracturing, the number of specimens before and after the rupture is the largest And the total number reached the minimum, indicating that the proppant can play an important role in the hydraulic sand fracturing test; (3) the sand is relatively large, the specific surface and standard deviation both reach the maximum, indicating that the fracture surface roughness is the largest under this test condition, and the fracturing effect is the best, but the specific surface and standard deviation are the minimum when fracturing without proppant, Indicating that the fracture surface fracturing effect is the worst at this time.

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Section: Introductionmentioning

confidence: 99%

Hydraulic sand test and analysis based on sound emission data and fracture surface

Zhang¹

2023

Preprint

Self Cite

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show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation on fracturing effects in hydraulic sand fracturing with acoustic emission and 3d laser scanning

Zhang¹,

Wang²,

Zhu

et al. 2023

Sci Rep

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Due to the extremely low permeability of shale reservoirs, large-scale reservoir fracturing is required. Hydraulic fracturing is one of the most important technologies in shale gas exploration and development. In this paper, the acoustic emission energy and the number of location and fracture surface morphology of specimens before and after fracture are studied through hydraulic sand fracturing test. The test results show that: (1) the energy ratio obtained during hydraulic fracturing without proppant is the smallest, and increasing the confining pressure, as well as reducing the displacement and viscosity of the fracturing fluid will cause the energy ratio to decrease. From the perspective of acoustic emission energy, the proppant play an important role in the generation of fractures during hydraulic sand fracturing; (2) when the confining pressure increases, the number of shale specimens before and after rupture is the largest, but the total number of locating events is smaller than the sanding ratio increased; there is no proppant hydraulic fracturing, the number of specimens before and after the rupture is the largest. And the total number reached the minimum, indicating that the proppant can play an important role in the hydraulic sand fracturing test; (3) the sand is relatively large, the specific surface and standard deviation both reach the maximum, indicating that the fracture surface roughness is the largest under the test condition, and the fracturing effect is the best, but the specific surface and standard deviation are the minimum when fracturing without proppant, so indicating that the fracture surface fracturing effect is the worst at this time.

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“…Systems with such a viscosity can hold the proppant volume in the well and transport it to the resulting fracture, thereby ensuring high efficiency of the whole operation. Rotational viscometry is a widely used method for determining the effective viscosity of fracturing fluids [49][50][51][52][53]. However, this type of measurement does not fully describe the structural and mechanical properties of liquids, which leads to a reduced spread of systems based on VES and synthetic polymers.…”

Section: Introductionmentioning

confidence: 99%

Applicability Assessment of Viscoelastic Surfactants and Synthetic Polymers as a Base of Hydraulic Fracturing Fluids

et al. 2022

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Hydraulic fracturing (HF) is currently the most widespread and effective method of oil production stimulation. The most commonly used fracturing fluid is crosslinked guar gels. However, when using these systems, problems such as clogging of the pore space, cracking, and proppant packing with the remains of the undestroyed polymer arise. Therefore, the efficiency of the hydraulic fracturing process decreases. In this work, compositions based on viscoelastic surfactants (VES) and synthetic polymers (SP) were considered as alternatives capable of minimizing these disadvantages. Most often, the possibility of using a composition as a fracturing fluid is evaluated using rotational viscometry. However, rotational viscometry is not capable of fully assessing the structural and mechanical properties of fracturing fluid. This leads to a reduced spread of systems based on VES and SP. This paper proposes an integrated approach to assessing the effectiveness of a water-based fracturing fluid. The proposed comprehensive approach includes an assessment of the main characteristics of water-based fracturing fluids, including an analysis of their structural and mechanical properties, which is based on a combination of rotational and oscillatory rheology and a comparative analysis of methods for studying the influence of fluids on the reservoir rock. The use of the developed approach to assess the technological properties of fracturing fluids makes it possible to demonstrate the potential applicability of new, unconventional fracturing fluids such as systems based on VES and SP.

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Experimental study on shale fracturing effect and fracture mechanism under different fracturing fluid viscosity: A case study of Guanyinqiao Member shale in Xishui, Guizhou, China

Cited by 7 publications

References 12 publications

Hydraulic sand test and analysis based on sound emission data and fracture surface

Hydraulic sand test and analysis based on sound emission data and fracture surface

Experimental investigation on fracturing effects in hydraulic sand fracturing with acoustic emission and 3d laser scanning

Applicability Assessment of Viscoelastic Surfactants and Synthetic Polymers as a Base of Hydraulic Fracturing Fluids

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