Progress and prospects of horizontal well fracturing technology for shale oil and gas reservoirs

Lei, Qun; Xu, Yizhuang; Chen, Bo; Guan, Bowen; Wang, Xin; Guoqiang, Bi; Li, Hui; Li, Shuai; Ding, Bin; Fu, Haifeng; Zheng, Tong; Li, Tao; Zhang, Haoyu

doi:10.1016/s1876-3804(22)60015-6

Cited by 84 publications

(16 citation statements)

References 22 publications

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“…The organic matters in the US marine shales with high maturity are mainly hydrocarbon oil and gas, which can be produced by fracturing the tight shale reservoirs. 5,6 As the world's largest oil importer, China is struggling to exploit shale resources to boost oil and gas production due to its large shale reserves of about 100 billion tons. 7,8 However, the lacustrine shales with low maturity dominate in China, accounting for about 60–80%, and the organic matter is mainly solid kerogen, which is insoluble in usual organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example

Zhao

Zheng

et al. 2023

Sustainable Energy Fuels

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Section: Introductionmentioning

confidence: 99%

Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example

Zhao

Zheng

et al. 2023

Sustainable Energy Fuels

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“…Unconventional oil has gradually become a hot topic in global oil exploration and development, with tremendous development potential, especially low-permeability and shale oil reservoirs. − Hydraulic fracturing is a common reservoir reconstruction method, which can greatly improve the flow capacity of the formation and enhance the recovery efficiency. − However, the high-permeability channel after fracturing results in the water intrusion, which seriously reduces oil production. To solve this problem, polymer microspheres are widely used and have been well recognized. , They have low cost and are simple, which are formed by polymerization of monomers under the action of an initiator and have good expansibility.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Wang

Yang

et al. 2023

Energy Fuels

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Nanospheres have been used as an available plugging material to solve the problem of water intrusion, which is of crucial importance to enhanced oil recovery (EOR). However, the microflow of nanospheres in a lowpermeability reservoir is complex, and its plugging performance and EOR mechanism need to be further investigated by a variety of experiments. In this paper, the expansion experiments were given priority to explore the water absorption and salt tolerance of nanospheres. The displacement experiments were conducted to investigate the plugging performance of nanospheres at the core scale. The flow characteristic and EOR mechanism of nanospheres at the microscale were revealed by nuclear magnetic resonance (NMR) experiments and microfluidic experiments. Expansion and displacement experiments results demonstrate that high salinity inhibits the expansibility and agglomeration of nanospheres, and the formation damage and plugging performance of nanospheres should be comprehensively considered. The suitable particle size of nanospheres should be optimized for field application. As for the microscale, NMR experiments revealed that nanospheres would first enter the large pore and then enter the middle and small pores. In microfluidic experiments, the oil recovery increased by 23.02% original oil in place after the injection of nanospheres. The systematic and comprehensive investigations of expansion property, plugging performance, flow characteristic, and EOR mechanism of nanospheres were conducted from core to microscale, which yielded significant insights into preventing water intrusion and enhancing oil recovery.

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“…For low-permeability reservoirs, increasing the permeability is the key to improving coalbed methane (CBM) production. − Network fracturing has achieved great success in the development of shale gas in extremely low permeability reservoirs, , which has important reference significance for the development of CBM. The core of network fracturing technology is a horizontal well and multistage fracturing. − The basic theory is to use multistage fracturing to form stress interference in the reservoir. − Through bending and expansion of the fractures formed via fracturing, the primary fractures in the reservoir are connected to the maximum extent possible, thus increasing the permeability and conductivity of the reservoir. The purpose of multifracturing is to form multiple main radial fractures around the wellbore and then to extend microfractures from the multiple main fractures. , …”

Section: Introductionmentioning

confidence: 99%

“…The core of network fracturing technology is a horizontal well and multistage fracturing. 6 − 8 The basic theory is to use multistage fracturing to form stress interference in the reservoir. 9 − 11 Through bending and expansion of the fractures formed via fracturing, the primary fractures in the reservoir are connected to the maximum extent possible, thus increasing the permeability and conductivity of the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

Tian

Cao

et al. 2023

ACS Omega

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The geological conditions of coal reservoirs in China are complex, and the reservoir permeability is generally lower. Multifracturing is an effective method of improving reservoir permeability and coalbed methane (CBM) production. In this study, two types of dynamic loads, CO 2 blasting and a pulse fracturing gun (PF-GUN), were used to conduct multifracturing engineering tests in nine surface CBM wells in the Lu'an mining area in the central and eastern parts of the Qinshui Basin. The curves of pressure versus time of the two dynamic loads were obtained in the laboratory. The prepeak pressurization time of the PF-GUN was 200 ms, and that of the CO 2 blasting was 2.05 ms, which just falls in the optimum pressurization time of multifracturing. The microseismic monitoring results revealed that, in terms of the fracture morphology, both the CO 2 blasting and PF-GUN loads produced multiple sets of fractures in the near-well zone. In the six wells used for the CO 2 blasting tests, an average of three branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures exceeded 60°. In the three wells stimulated by PF-GUN, an average of two branch fractures were produced outside of the main fracture, and the average angle between the main fracture and the branch fractures was 25−35°. The multifracture characteristics of the fractures formed via CO 2 blasting were more obvious. However, a coal seam is a multifracture reservoir with a large filtration coefficient; the fracture will not extend after reaching the maximum scale under a certain gas displacement condition. Compared with the traditional hydraulic fracturing technique, the nine wells used in the multifracturing tests exhibited an obvious stimulation effect with an average increase of 51.4% in daily production. The results of this study provide an important technical reference for the efficient development of CBM in low-and ultralowpermeability reservoirs.

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Progress and prospects of horizontal well fracturing technology for shale oil and gas reservoirs

Cited by 84 publications

References 22 publications

Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example

Sub- and supercritical water conversion of organic-rich shale with low-maturity for oil and gas generation: using Chang 7 shale as an example

A Systematic Method to Investigate the EOR Mechanism of Nanospheres: Laboratory Experiments from Core to Micro Perspective

Mechanism and Practice of Multifracturing Using Dynamic Loads in a Low-Permeability Coal Reservoir

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