Fracturing fluid retention in shale gas reservoirs:mechanisms and functions

You, Lijun; Zhou, Yang; Kang, Yili; Yang, Bin; Cui, Zhongyu; Cheng, Qiuyang

doi:10.1007/s12517-019-4955-2

Cited by 19 publications

(14 citation statements)

References 70 publications

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“…During the process of fracturing fluid flowback in a shale gas well, all kinds of damage factors are unavoidable and irreversible. Considering the difficulty of treatment and the negative impact on fracture damage of flowback fluids, the fracture forming capacity of the retained fracturing fluid should be actively developed . For instance, take advantage of the hydrophilicity of clay minerals and the unique structure of the organic–clay complex to redistribute the residual fracturing fluids in the shale matrix, achieving the goal of preventing formation damage.…”

Section: Resultsmentioning

confidence: 99%

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Study on Formation Damage of Fracturing and Its Prevention through an Environmentally Friendly Method of Oxidative Stimulation in Shale Gas Reservoirs

et al. 2022

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Large amounts of fracturing fluid remain in the reservoir after fracturing, rendering it easy to induce reservoir damage and restrict the stimulation effect. Based on the idea of less flowback of fracturing fluid and considering the characteristics of abundant organic matter and pyrite in shale gas reservoirs, an environmentally friendly method of oxidative stimulation is proposed. Through experimental verification and theoretical analysis, it is found that the oxidative stimulation method has a good application prospect in shale reservoirs. By adding an oxidant to the prefrac fluid, the oxidative stimulation can increase the porosity, enlarge the pore size, promote the imbibition capacity of the shale gas reservoir, and prevent the water trapping damage and stress-sensitive damage by reducing water saturation of the fracture and selective dissolution of the fracture surface. Since the fracturing flowback fluid faces a serious risk of environmental pollution and purification treatment due to its variety and complexity of pollutants, oxidative stimulation can prevent environmental pollution by reducing the leakage risk of the flowback fluid with a low flowback rate and continuous purification treatment of the flowback fluid, thus achieving the goal of environmentally friendly development and stimulation of shale gas reservoirs.

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Section: Resultsmentioning

confidence: 99%

“…Field data show that lower flowback rates generally result in higher gas production . A large number of studies have also confirmed that residual fracturing fluid can promote fracture propagation through water–rock interaction during shut-in .…”

Section: Introductionmentioning

confidence: 93%

Study on Formation Damage of Fracturing and Its Prevention through an Environmentally Friendly Method of Oxidative Stimulation in Shale Gas Reservoirs

et al. 2022

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“…where K w is water permeability, mD; μ w is water viscosity, Pa s; P c is capillary force, Pa; ⌀ is porosity; A c is imbibition crosssectional area, cm 2 ; S wf is the water saturation of the imbibition front; S wi is the initial water saturation; V imb is the volume of imbibed water, cm 3 ; and t is the imbibition time, s. Shale formation has a tremendous capacity for imbibition of water that is injected during MHF stimulation. 60,61 You et al 62 summarized the factors that promote imbibition, including well-developed bedding and natural fractures, ultralow initial water saturation, high content of clay mineral, high capillary pressure, dual-wettability (water and hydrocarbon), and high content of soluble salt. The initial water saturation, S wi , in the main shale gas production layer is usually less than 30−45% and much less than the irreducible water saturation (64− 80%).…”

Section: Feasibility Of Zfr Of Hydraulic Fracturing Fluidmentioning

confidence: 99%

“…Shale formation has a tremendous capacity for imbibition of water that is injected during MHF stimulation. , You et al summarized the factors that promote imbibition, including well-developed bedding and natural fractures, ultralow initial water saturation, high content of clay mineral, high capillary pressure, dual-wettability (water and hydrocarbon), and high content of soluble salt. The initial water saturation, S wi , in the main shale gas production layer is usually less than 30–45% and much less than the irreducible water saturation (64–80%). − Bedding and micronatural fractures are well-developed in most gas shales, which possess an extremely high capillary force, P c , with the combination of nanopores ranging from 100 to 200 nm .…”

Section: Feasibility Of Zfr Of Hydraulic Fracturing Fluidmentioning

confidence: 99%

“…Fluid retention is another problem that needs to be considered for realizing ZFR. The influencing factors of fracturing fluid retention in shale reservoirs have been studied preliminarily. ,, George E. King pointed out that the amount of retention fluid is proportional to the number of fractures. High pressure and a large volume of HFF create a complex fracture network.…”

Section: Feasibility Of Zfr Of Hydraulic Fracturing Fluidmentioning

confidence: 99%

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Zero Flowback Rate of Hydraulic Fracturing Fluid in Shale Gas Reservoirs: Concept, Feasibility, and Significance

et al. 2021

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A high flowback rate of hydraulic fracturing fluid (HFF) yields a high gas production rate in a tight sand gas reservoir. This idea is well followed when it comes to the hydraulic fracturing of a shale gas well. Therefore, numerous studies have focused on increasing the flowback rate of HFF in shale gas reservoirs to mitigate the water blocking damage. Yet, only a small portion of the injected fluid (less than 20%) could be recovered during flowback operation. Moreover, there is no good correlation between the gas production rate and flowback rate for shale gas wells. Surprisingly, a phenomenon that a low flowback rate of HFF usually yields a high gas production rate is found recently by field data studies. In this case, the authors investigated the reasons for this abnormal phenomenon and believed that reducing the flowback rate of HFF in a shale gas reservoir could be a new strategy for dealing with the injected HFF. Therefore, a new concept called zero flowback rate (ZFR) of HFF is put forward to serve as an unconventional way to manage the high volume of HFF. ZFR of HFF is a concept compared with the flowback rate of the fracturing fluid for a conventional reservoir. It is worth noting that zero in the ZFR concept does not stand for the absolute number 0. It means that reducing the flowback rate of HFF is the goal of the ZFR strategy. To analyze the feasibility of realizing ZFR, the geological conditions of gas shale and engineering conditions of hydraulic fracturing were evaluated by comparing the relative studies. It showed that gas shale has the potential to imbibe most of the HFF and retain the imbibed fluid without contaminating the groundwater. ZFR can be realized by extending the shut-in time or adjusting the properties of HFF. Compared with the conventional idea of increasing the flowback rate of HFF, ZFR is of great significance. It does not only recover the relative gas permeability of the shale reservoir by redistributing the liquid phase from the fractures into the shale matrix but also enhances it by creating new microfractures. ZFR is cost-saving and environmentally friendly by dealing with a reduced volume of flowback HFF. ZFR has a high potential of becoming a viable strategy for the development of shale gas reservoirs.

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Study on Sealing Performance and Solubility of High Plastic-Soluble Aluminum-Based Sealing Ring Materials for Soluble Bridge Plugs

Wang,

Jiang,

Lin

et al. 2023

J. of Materi Eng and Perform

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Fracturing fluid retention in shale gas reservoirs:mechanisms and functions

Cited by 19 publications

References 70 publications

Study on Formation Damage of Fracturing and Its Prevention through an Environmentally Friendly Method of Oxidative Stimulation in Shale Gas Reservoirs

Study on Formation Damage of Fracturing and Its Prevention through an Environmentally Friendly Method of Oxidative Stimulation in Shale Gas Reservoirs

Zero Flowback Rate of Hydraulic Fracturing Fluid in Shale Gas Reservoirs: Concept, Feasibility, and Significance

Study on Sealing Performance and Solubility of High Plastic-Soluble Aluminum-Based Sealing Ring Materials for Soluble Bridge Plugs

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