Experimental study on gas adsorption and drainage of gas-bearing coal subjected to tree-type hydraulic fracturing

Zuo, Shaojie; Zhang, Liang; Deng, Kai

doi:10.1016/j.egyr.2021.12.003

Cited by 12 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the theory of fluid mechanics, the law of conservation of mass and energy must be obeyed during the movement of fluid [18][19][20].…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Chu

2024

IJNRES

View full text Add to dashboard Cite

Hydraulic fracturing technology has been widely used in the development of low-permeability oil fields, gas fields, and coalbed methane. The morphology of the sand dike formed by proppant deposition in the fracture determines the effective shape of the fracture, the effective volume, the flow conductivity, and the validity period of the fracture, and the research on the proppant transport law in the fracture is of great significance in optimizing the fracturing construction parameters and improving the fracturing production increase effect. In this paper, a systematic study on the proppant transport law in hydraulic fracturing fracture is carried out by numerical simulation, which reveals the mechanism of proppant settling and transport, clarifies the proppant transport and placement law under different working conditions, and puts forward the optimization strategy of hydraulic fracturing process on the basis of this study.

show abstract

“…Based on the theory of fluid mechanics, the law of conservation of mass and energy must be obeyed during the movement of fluid [18][19][20].…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Chu

2024

IJNRES

View full text Add to dashboard Cite

show abstract

“…5 However, the coal seams are less permeable and need to be hydraulically fractured to increase the permeability before the drainage of coalbed methane, especially in China. 6,7 Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure and plays an important role in the process of hydraulic fracturing. 8−10 At present, the fracturing fluids used in coal seam hydraulic fracturing mainly include water, active water, clean fracturing fluid, acidic fracturing fluid, foam fracturing fluid, supercritical CO 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

“…Affected by the shortage of fossil energy and the greenhouse effect, all countries in the world are actively exploring new energy. , Coalbed methane is a new type of clean energy with broad application prospects, which has attracted the attention of governments all over the world. , According to the data of the International Energy Agency (IEA), the total global coalbed methane resources buried at a depth of less than 2000 m can reach 260 trillion m 3 , which is more than twice the proven reserves of conventional natural gas . However, the coal seams are less permeable and need to be hydraulically fractured to increase the permeability before the drainage of coalbed methane, especially in China. , Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure and plays an important role in the process of hydraulic fracturing. − …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Li,

Sun,

et al. 2023

ACS Omega

Self Cite

View full text Add to dashboard Cite

Fracturing fluid is a key factor affecting the hydraulic fracture morphology and coal microstructure, which plays a key role in the hydraulic fracturing effect. To compare the effect of clean water, clean fracturing fluid, and acid fracturing fluid on the pore structure of coal, this paper used high-pressure mercury injection (MIP), low-temperature N2 adsorption (LT-N2A), and scanning electron microscopy (SEM) to determine the pore structure of Guizhou bituminous coal before and after the action of fracturing fluid. The results show that clean water can cause mineral expansion and reduce pore volume by about 6% and clean fracturing fluid and acid fracturing fluid can increase pore volume by 3 and 12%, respectively, due to different degrees of acidity. The MIP data show that the pore structure of coal samples is more complex after the action of different fracturing fluids, and acidic fracturing fluids can increase the fractal dimension of the pore by about 7%. The LT-N2A data showed that the fractal dimension of micropores and transition pores decreased after the action of different fracturing fluids. In general, acid fracturing fluid has the best effect on the coal microstructure, followed by clean fracturing fluid, and the least effect on clean water.

show abstract

“…In recent years, relevant experts and scholars at home and abroad have carried out a large number of theoretical analyses, laboratory experiments, numerical simulations, similar simulations, and engineering experiments to improve coal seam permeability. A variety of coal seam fracturing and permeability-inducing technologies such as deep-hole blasting (Kurlenya et al, 2020;Liu et al, 2022a), water jet slotting (Huang et al, 2020;Huang et al, 2021), hydraulic fracturing (Bai et al, 2020;Wang et al, 2022a), CO 2 phase transition fracturing (Shang et al, 2022), tree-type borehole (Zuo et al, 2022), protective layer mining (Wang et al, 2022b), and ultrasonic waves to improve permeability (Li et al, 2021) have been used. Fair effects brought by these attempts have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Study on improving the gas extraction efficiency by deep-hole pre-split blasting in Wulunshan Coal Mine, Guizhou

Yang

Zheng²,

Li³

et al. 2022

Front. Earth Sci.

View full text Add to dashboard Cite

Due to the low permeability of the coal seam and the low gas extraction rate in conventional boreholes in the Wulunshan Coal Mine in Guizhou, in this study, the deep-hole pre-split blasting method is applied to study the improvement of the gas extraction efficiency by increasing the permeability of the coal seam. The study comprehensively expounds the process in which the deep-hole pre-split blasting method is applied to improve the gas extraction efficiency and proposes a numerical simulation method that combines ANSYS/LS-DYNA and COMSOL Multiphysics. Using the method, the initiation of blasting fracture channels and the subsequent influence on the gas extraction range have been comprehensively and directly researched and analyzed. Finally, some theoretical research has been verified by field experiments. According to the recorded simulation of the Wulunshan Coal Mine, the exposed area of the blasting borehole was 42 times the size of the conventional drilling borehole, and the pressure relief space was 1,050 times that of the conventional drilling borehole, which can connect about 32 m3 of coal. Compared with conventional drilling boreholes, in the process of gas extraction, the control range of the controlled pressure reduction was 4–7 times, the range of gas pressure reaching the standard was 25 times, and the peak pressure was reduced by 3–5 times. The average gas concentration was 1.85 times that of conventional boreholes, and the cumulative gas extraction volume of blasting boreholes was 4.48 times that of conventional boreholes. The research results prove that the application of blasting and permeability enhancement in the coal seam with a high gas content and low permeability can effectively improve the gas extraction efficiency in the Wulunshan Coal Mine in Guizhou.

show abstract

Experimental study on gas adsorption and drainage of gas-bearing coal subjected to tree-type hydraulic fracturing

Cited by 12 publications

References 29 publications

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Numerical Simulation of Proppant Transportation and Placement Law In Fractured Coal Reservoirs

Evolution Characteristics of the Microstructure with Different Fracturing Fluids: An Experimental Study of Guizhou Bituminous Coal

Study on improving the gas extraction efficiency by deep-hole pre-split blasting in Wulunshan Coal Mine, Guizhou

Contact Info

Product

Resources

About