Enhance low temperature oxidization of shale gas recovery using hydrogen peroxide

Zhou, Yu; Lei, Yafeng; Chen, Wei; Yu, Weigang

doi:10.1016/j.petrol.2018.01.053

Cited by 19 publications

(24 citation statements)

References 35 publications

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“…The shale samples used in this study were collected from the Yanshan area, in Northern China [17]. Before the experiment, samples were ground and screened to get small particles with sizes of 0.45-0.71 mm.…”

Section: Sample Preparation and Experimentsmentioning

confidence: 99%

“…A significant increase in pore volume was found in the pores ranging from 10 to 500 nm in diameter of the treated shale. Chen et al also found that mean pore size and pore volume increased with increasing reaction duration with H 2 O 2 under ambient conditions [17]. In practice, the reservoir temperature and pressure are greatly higher than under ambient conditions.…”

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confidence: 93%

“…Organic-rich shale has high chemical reactivity and it is sensitive to oxidation reactions [14,15]. Chen et al have used a high-temperature combustion method to remove organic matter in order to improve the shale matrix diffusivity [16,17].In addition to high-temperature oxidation, low-temperature oxidation has also been applied to improve shale effective porosity in experiments. Oxidizers such as sodium hypochlorite (NaOCl), sodium peroxodisulfate (Na 2 S 2 O 8 ), and hydrogen peroxide (H 2 O 2 ) have been widely used to remove organic matter from soil [17][18][19].…”

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confidence: 99%

“…Chen et al have used a high-temperature combustion method to remove organic matter in order to improve the shale matrix diffusivity [16,17].In addition to high-temperature oxidation, low-temperature oxidation has also been applied to improve shale effective porosity in experiments. Oxidizers such as sodium hypochlorite (NaOCl), sodium peroxodisulfate (Na 2 S 2 O 8 ), and hydrogen peroxide (H 2 O 2 ) have been widely used to remove organic matter from soil [17][18][19]. In order to increase the pore volume and porosity of shale, chloroform (CH 3 Cl) was firstly used to remove extractable organic matter and then hydrogen peroxide was used to remove solid organic matters [20].…”

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confidence: 99%

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confidence: 99%

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H2O2-Enhanced Shale Gas Recovery under Different Thermal Conditions

Lei

Wang

et al. 2019

Energies

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The permeability of tight shale formations varies from micro-Darcy to nano-Darcy. Recently, hydrogen peroxide (H2O2) was tested as an oxidizer to remove the organic matter in the rock in order to increase shale permeability. In this study, shale particles were reacted with hydrogen peroxide solutions under different temperature and pressure conditions in order to “mimic” underground geology conditions. Then, low-temperature nitrogen adsorption and desorption experiments were conducted to measure the pore diameters and porosity of raw and treated shale samples. Moreover, scanning electron microscopy (SEM) images of the samples were analyzed to observe pore structure changes on the surface of shale samples. From the experiments, it was found that the organic matter, including extractable and solid organic matter, could react with H2O2 under high temperature and pressure conditions. The original blocked pores and pore throats were reopened after removing organic matter. With the increase of reaction temperature and pressure, the mean pore diameters of the shale samples decreased first and then increased afterwards. However, the volume and Brunauer–Emmett–Teller (BET) surface areas of the shale particles kept increasing with increasing reaction temperature and pressure. In addition to the effect of reaction temperature and pressure, the pore diameter increased significantly with the increasing reaction duration. As a result, H2O2 could be used to improve the shale permeability.

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Section: Sample Preparation and Experimentsmentioning

confidence: 99%

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confidence: 93%