Editor’s Page: Oil Shale Mining-Related Research in Estonia

Valgma, Ingo

doi:10.3176/oil.2009.4.01

Cited by 14 publications

(17 citation statements)

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“…In case of underground mining full seam and partial seam blasting was used. In years 1970 to 2000 partial seam longwall mining was used [32][33][34] [35].…”

Section: B Extractingmentioning

confidence: 99%

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Reduction of Oil Shale Losses

Valgma

Väizene

Kolats

et al. 2015

ETR

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Oil shale utilisation losses reach 70% in some cases. These are closely related to legislation, backfilling and waste rock usage. Much smaller sections include production of oil, electricity and chemicals in which most of the research and development is performed today. Current urgent topics for investigating, testing and developing of oil shale mining related questions are backfilling, mechanical extracting of shale, fine separation, selective separation and optimised drilling and blasting. Reducing oil shale losses will be more actual in the future, because the depth of mining increases and the taxes for resource and pollutants are increasing as well.

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“…In case of underground mining full seam and partial seam blasting was used. In years 1970 to 2000 partial seam longwall mining was used [32][33][34] [35].…”

Section: B Extractingmentioning

confidence: 99%

“…Due to weak limestone layers on top of underground room and pillar mining sections in Estonia mine, dilution is high and not only full seam, but in some cases 1.3 times higher seam is extracted [35].…”

Section: B Extractingmentioning

confidence: 99%

Reduction of Oil Shale Losses

Valgma

Väizene

Kolats

et al. 2015

ETR

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“…Open-cast mining requires a large amount of arable land and can greatly damage the environment, while underground mining in thin oil shale deposits is usually expensive [3,[6][7][8]. With the emergence of the in-situ mining method, oil shale can directly produce shale oil and gas underground, thereby reducing environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

“…Oil shale is mainly extracted via open cast mining and underground mining, both of which are classified as excavation mining methods. Open-cast mining requires a large amount of arable land and can greatly damage the environment, while underground mining in thin oil shale deposits is usually expensive [3,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Structure of the Straight Cone Nozzle and the Parameters of Borehole Hydraulic Mining for Huadian Oil Shale Based on Experimental Research

Wen

Chen

2017

Energies

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Abstract:Oil shale is a kind of potential alternative energy source for petroleum and has attracted the attention of energy researchers all over the world. Borehole hydraulic mining has more prominent advantages than both conventional open-pit mining and underground mining. It is very important to attempt to use the borehole hydraulic mining method to exploit underground oil shale. The nozzle is the key component of borehole hydraulic mining and reasonable mining parameters are also crucial in exploiting underground oil shale efficiently. The straight cone nozzle and the oil shale of Huadian area will be taken as the research objects. The self-developed, multifunctional, experimental device can test both the jet's performance as well as the breaking of oil shale by the high-pressure water jet using the straight cone nozzle and varying structural parameters. Comprehensive analysis of the results of an orthogonal experimental design, including range analysis and variance analysis, demonstrate the optimal structural parameters of a straight cone nozzle as follows: the outlet diameter is 4 mm, the length to diameter ratio is 2.5, and the contraction angle is 60 • . In addition, in order to maximize the efficiency of borehole hydraulic mining for Huadian oil shale, the non-submerged jet should be placed parallel to the oil shale bedding. These results can provide scientific and valuable references for borehole hydraulic mining of oil shale.

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“…Continuously the environmental or social restrictions require increasing coefficients that increase mineral losses [20]. This could be limited with the help of technological development [34,13,36]. During the period starting from 1916 many technologies have been used and tested [31].…”

Section: Introductionmentioning

confidence: 99%