Experimental study on the influencing factors of hydraulic fracture initiation from prefabricated crack tips

Liu, Zhenghe; Yang, Jun; Yang, Lusheng; Ren, Xiaokai; Peng, Xuan; Lian, Haojie

doi:10.1016/j.engfracmech.2021.107790

Cited by 20 publications

(1 citation statement)

References 25 publications

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“…There are numerous studies that have focused on the properties of proppants, including size distribution, shape, and conductivity [8,9,10]. The use of proppants is essential in hydraulic fracturing operations to create and maintain fractures in rock formations that enabling enables the optimum extraction of hydrocarbons [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study Of Proppant Based Fracturing Fluid Flowing Through Regular Fracture Geometry In Different Rock Samples.

Soomro,

Ansari,

Shams

et al. 2024

Special Topics Rev Porous Media

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The efficiency hydraulic fracturing procedure must be enhanced by introducing various types of proppants to extract maximum production from low permeability reservoirs. The problem with hydraulic fracturing procedure is the selection of appropriate proppant type for specific composition of reservoir rock. Therefore, this study provides an experimental investigation on flow behavior of proppant-based fracturing fluid through regular fracture geometries in different rock samples. The challenge for conducting such an investigation is to achieve detailed fracture response of fracture network while fracturing a rock at surface in laboratory. For this purpose, a specially designed assembly on laboratory scale was used to perform an experiment on fracturing. The assembly was designed to hold cylindrical core samples which are either outcropped from the original location or by forming limestone, sandstone molds. The results of this revealed that the permeabilities were altered from 2.3 to 3.3mD for limestone samples, 2.2 to 2.9mD for shale samples and 2.1 to 3.5mD for sandstone samples. Moreover, mechanical behavior was insightful for shale samples as their tensile strength ranged from 1080 to 130 psi with the average magnitudes of 700 to 720 psi. The bulk density of proppants was found to be 95.90 lbm/ft³ and the settling packed porosity of the proppants was calculated to be 0.420 with the specific gravity of 2.65. Further, the pattern of geometry observed in sandstone and shale formation was vertical linear while in limestone the shape of fracture was parabolic therefore such proppants are more fracture length yielding for sandstone and shale formations. The study concludes that limestone formation requires different configuration while fracturing through proppants and shale and limestone has similar fracture behavior while proppant based hydraulic fracturing. The outcomes of this study are very useful to design any fracture activity considering the fracture behavior of different formations to specific type of proppants.

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Section: Introductionmentioning

confidence: 99%

Experimental Study Of Proppant Based Fracturing Fluid Flowing Through Regular Fracture Geometry In Different Rock Samples.

Soomro,

Ansari,

Shams

et al. 2024

Special Topics Rev Porous Media

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Effects of different fracture parameters on microseisms induced by hydraulic fracturing

Shan

Zhang

et al. 2023

Bull Eng Geol Environ

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The microseism induced by hydraulic fracturing is of great significance to the development of geothermal reservoirs and the site selection of geothermal systems. In this study, taking geothermal field data from Qiabuqia as a geological reference, several models are developed for hydraulic fracturing simulations based on the models included in the commercial FracMan™ software suit. A series of numerical simulations are carried out to explore the effects of different fracture parameters, including the existence of faults, in-situ stress state, fracture occurrence, and fracture distribution near faults, on the induced microseisms. The results show that during hydraulic fracturing, the existence of faults does affect the propagation direction of the newly generated fractures, causing the fractures to extend toward the fault. The faults also increase the magnitude of microseismic events and make the distribution of microseismic events farther. Under three different in-situ stress states, the magnitudes of induced microseisms and the distance between microseismic events and injection wells are different, mainly due to the different forms of energy release. The total energy of induced microseisms under the reverse faulting stress state (RF) is the largest. Under the normal faulting stress state (NF), the number of microseismic events is the least, with only 28, and these microseismic events are concentrated near the well, with the farthest distribution distance of only 150 m. The fracture occurrence has a significant effect on induced microseisms, mainly affecting the number and distribution range of induced microseisms. With the same number of fractures, as the fracture concentration to the fault increases, both the maximum magnitude and the farthest distribution distance of the induced microseisms increase.

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Experimental Study on the Response Characteristics of the Apparent Resistivity of Rock True Triaxial Hydraulic Fracturing

Yan

Zhao

et al. 2021

Nat Resour Res

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Experimental study on the influencing factors of hydraulic fracture initiation from prefabricated crack tips

Cited by 20 publications

References 25 publications

Experimental Study Of Proppant Based Fracturing Fluid Flowing Through Regular Fracture Geometry In Different Rock Samples.

Experimental Study Of Proppant Based Fracturing Fluid Flowing Through Regular Fracture Geometry In Different Rock Samples.

Effects of different fracture parameters on microseisms induced by hydraulic fracturing

Experimental Study on the Response Characteristics of the Apparent Resistivity of Rock True Triaxial Hydraulic Fracturing

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