Study on the Mechanism of Fiber Fracturing Fluid Controlling Pulverized Coal Transportation

Wang, Wei; Zhao, Haifeng

doi:10.3390/en15062165

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…In high-viscosity fracturing fluid, fiber and proppant form a fiber-proppant cluster to improve the delivery efficiency of proppant and increase the conductivity of proppant. The network structure formed by the fiber can maintain the stability of the proppant and prevent the backflow of the proppant [14][15][16]. However, this technology still has certain limitations, and the fracturing fluid still needs to be highly viscous [17].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Proppant Placement Technology and Its Application

Guo,

Zhou,

Song

et al. 2024

Contemporary Developments in Hydraulic Fracturing

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Aiming at solving the problem of sand production and limited sand carrying distance during slick water fracturing of unconventional oil and gas reservoirs, an efficient proppant placement technology based on fiber structure stabilizer is innovatively developed: During the sand fracturing construction of oil and gas wells, the fiber and fiber structure stabilizer is pumped into the reservoir with proppant in sand-adding stage, and the components including fiber, stabilizer, proppant and drag reducing agent form a stable net-like structure to improve the proppant placement distance and stacking height, thus increasing the effective support volume. With this technology, the seepage mode of artificial fracture is changed and its conductivity of supporting fracture body is greatly improved; the critical flow rate of proppant flowback is increased up to tens of folds compared in the same operation condition. It has been applied in more than 30 wells of tight gas and shale oil and gas in China. The sand production rate after fracturing in tight gas was 79% lower than conventional fracturing without additives of fiber and fiber structure stabilizer. The effect of proppant flowback control and hydrocarbon stimulation is remarkable.

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Section: Introductionmentioning

confidence: 99%

High-Efficiency Proppant Placement Technology and Its Application

Guo,

Zhou,

Song

et al. 2024

Contemporary Developments in Hydraulic Fracturing

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show abstract

“…A series of laboratory evaluations were designed to quantify the effectiveness of fibers on proppant flowback control. Wang and Zhao 21 proposed to control pulverized coal production by a fiber fracturing fluid technology. Based on a force analysis of coal powder in the fracture and the microstructure of the fiber-proppant, a critical intercepted particle size model of coal powder is established.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Proppant Settling Velocity in Fiber-Containing Fracturing Fluids

Bai,

2023

ACS Omega

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Hydraulic fracturing is the main stimulation method in the development of oil and gas fields. It is helpful to predict the fracture support effect during fracturing by calculating the settling velocity of particles in the fracturing fluid. Experimental research shows that fibers mixed into the fracturing fluid can improve the performance of suspended sand. In this study, fiber was considered a solvent in the fracturing fluid, and the constitutive model of the fiber-containing fracturing fluid was modified according to the fluid rheology. From the analysis of the mechanical behavior in the fibercontaining fluid, the settling velocity of particles slowed down because of some reasons. First, the viscosity of the fiber-containing fracturing fluid increased significantly. The other mechanism is the resistance mechanism of the fiber acting on the particle. The apparent viscosity was fitted based on the rheological model and the measurements. Then, the drag coefficient model of the settling particles was built according to the rheological data of the fibrous fluid. A semi-empirical model was developed to predict the terminal settling velocity through research on dynamics. By characteristic analysis of the results, we found that the fiber on the settling velocity is closely related to the concentration of the base fluid. This prediction model is suitable for the base fluid and fiber-containing fracturing fluid, and the average relative difference between the prediction model and measurements was acceptable.

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“…Therefore, reasonable prevention and control measures of pulverized coals are very important to achieve good permeability and fracture conductivity of coal seams. A large number of experiments on pulverized coal prevention and control have been conducted in the lab and by field study [5][6][7]. It is found that the surface wetting properties of pulverized coal can be greatly changed by the introduction of surfactants [8][9][10][11][12][13][14][15][16][17][18] or changing its particle size and other variables, providing a theoretical basis for pulverized coal control [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Migration and Intrusion Characteristics of Pulverized Coal in Propped Fractures

et al. 2023

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Aiming at the problem of pulverized migration and plugging propped fractures during coal seam fracturing, we experimentally studied the pressure changes and pulverized coal blocking characteristics with deionized water and solutions of three surfactants including 1227 (C21H38ClN), SDS (C12H25SO4Na) and TX-100 (C34H62O11). A device capable of visualizing propped fractures was established, and simulation experiments were conducted with solutions of different surfactants at different injection flow rates. The obtained images were binarized and analyzed to quantify the pulverized coal blockage degrees of facture under different conditions. The experimental results show that: (1) The higher the injection flow rate, the higher the inlet pressure. (2) All three surfactants can lower the injection pressure, as compared with water alone. SDS decreases the injection pressure more obviously at low injection flow rates, and the other two perform better at high injection flow rates. (3) Similar to their effects on inlet pressure, the ratio of pulverized coal in SDS solution is lower at low injection flow rates, while TX-100 and 1227 solutions show lower ratios of pulverized coal at high injection flow rates. Our work has provided a theoretical support for coal blockage removal and pressure reduction in propped fractures during coal seam fracturing to improve coal seam permeability and further improves the dust prevention effect of coal seam water injection.

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Study on the Mechanism of Fiber Fracturing Fluid Controlling Pulverized Coal Transportation

Cited by 7 publications

References 26 publications

High-Efficiency Proppant Placement Technology and Its Application

High-Efficiency Proppant Placement Technology and Its Application

Prediction of Proppant Settling Velocity in Fiber-Containing Fracturing Fluids

Experimental Study on Migration and Intrusion Characteristics of Pulverized Coal in Propped Fractures

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