Combined gas drainage practice at upper corner of high-intensity fully mechanized caving face
Gong-kuang zidonghua, 2020 In view of traditional single upper corner gas control technology cannot effectively solve problem of severe over-limit of gas at upper corner of high-intensity fully mechanized caving face, taking Wangjialing Coal Mine as engineering background, the ...
DUAN Huijun
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Laser-induced sublimation extraction for centimeter-resolution multi-species greenhouse gas analysis on ice cores [PDF]
Atmospheric Measurement Techniques, 2023 Precision, accuracy, and temporal resolution are key to making full use of atmospheric trace gas records in ice cores. These aspects will become especially crucial for ice cores that aim to extend the ice core record to the last 1.5 Myr, i.e., across the
L. Mächler +11 more
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Superior layout and effect analysis of high directional drilling considering advancing speed effect
Meikuang Anquan, 2022 In order to control the gas flow of the working surface, improve the gas extraction capacity of the mining-out area, this paper takes Wangjialing Mine 12302 working surface as a test object, and the evolution law of mining-induced fractures in ...
CHEN Long +4 more
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Technology assessment of vertical and horizontal air drilling potential in the United States. Final report [PDF]
, 1993 The objective of the research was to assess the potential for vertical, directional and horizontal air drilling in the United States and to evaluate the current technology used in air drilling.
Carden, R. S.
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Research on gas extraction technology in goaf across working face
Gong-kuang zidonghua, 2023 The Y-shaped ventilation continuous working face adopts the technology of gob-side entry retaining to improve the coal recovery rate. As the working face recovers, the goaf area will expand and connect.
LI Qianrong +4 more
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Slimhole drilling and directional drilling for on-site inspections under a Comprehensive Test Ban: An initial assessment [PDF]
, 1995 On Site-Inspection (OSI), under the Comprehensive Test Ban being negotiated in the Conference on Disarmament in Geneva, may include drilling at the site of a suspected clandestine underground nuclear explosion to recover radioactive samples. It is in the
Heuze, F.E.
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Measurement method of borehole wall resistivity for coal mine gas extraction
Gong-kuang zidonghua, 2022 For borehole wall state detection of horizontal directional kilometer drilling rig used for coal mine gas extraction, it is considered through analysis that the commonly used logging technologies such as gamma ray method and ultrasonic method are ...
LI Jie +5 more
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Steerable percussion air drilling system [PDF]
, 1993 The cost-sharing contract between the US Department of Energy and Smith International provides the funding to further develop this concept into two complete steerable percussion air drilling system prototypes, each integrated with a navigation tool ...
Bui, H. D., Oliver, M. S., Gray, M. A.
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EnergiesThe submarine cable installed in the directional drilling pipeline may face constrained ampacity due to the narrow air gap and complex thermal environment.
Kun Huang +8 more
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Technical report for a fluidless directional drilling system demonstrated at Solid Waste Storage Area 6 shallow buried waste sites [PDF]
, 1995 The purpose of the research was to demonstrate a fluidless directional drilling and monitoring system (FDD) specifically tailored to address environmental drilling concerns for shallow buried wasted.
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