Abstract Goaf treatment and comprehensive utilization of geothermal energy are great significance to the restoration land resources sustainable development in coal mining subsidence areas. In this paper, goaf technology reviewed detail. Among them, mainly includes: caving method, filling support closed isolation method joint method. Geothermal shallow ground source heat pump technology, coaxial...

Taking into account the need for post-war reconstruction of country’s infrastructure, development high-quality drilling fluids based on Ukrainian mineral raw materials becomes a particularly urgent problem. Detailed studies rheological properties aqueous dispersions Na+-bentonite from Cherkasky deposit (Ukraine) were carried out in relation to horizontal directional drilling. The effect pH, ion...

Environmental concerns surrounding drilling for gas are intense due to expansion of shale gas drilling operations. Controversy surrounding the impact of drilling on air and water quality has pitted industry and lease-holders against individuals and groups concerned with environmental protection and public health. Because animals often are exposed continually to air, soil, and groundwater and ha...

Directional drilling in the oil fields relies particularly on “on-fly” measurements of natural magnetic field (measurements while drilling; MWD); MWD are eventually used to construct well path. These superposition signals from internal, core and crustal, external, ionospheric magnetospheric sources noise elements borehole assembly. The internal mostly constant time accounted for through Earth's...

Progressive change of microfabrics of deep-sea sediments during early diagenesis was analyzed using two drill cores collected from the Sites U1305 and U1306 of the Integrated Ocean Drilling Program Expedition 303 in the Labrador Sea in the northwest Atlantic Ocean. Microfabrics were analyzed by scanning electron microscope and deduced from anisotropy of magnetic susceptibility. DiŠerent microfa...

This paper presents the MAMView framework to help users and developers in understanding the data organisation in Metric Access Methods (MAM). Users and developers can explore and share dynamic and interactively 2or 3-dimensional representations of a MAM. Such representations can be the steps of a similarity query or the insertion of an object, or the data organisation in a MAM. MAMView was deve...

Heat, generated during the drilling of a dental implant site preparation, leads to a temperature rise and consequently to a thermal injury of the bone tissue surrounding the implant site, which can cause the subsequent implant failure. In this article, we present new findings related to the temperature rise during implant site drilling under real conditions on a bovine rib bone specimen. The ex...

The drilling and riveting processes are widely used in the assembly of carrier rocket, which makes the efficiency and quality of drilling become the important factor affecting the assembly process. According to the problem existing in the drilling of thick stacked plate (thickness larger than 10mm) of carrier rocket, such as drill break, large noise and burr etc., experimental study of the infl...

The ordovician limestone water inrush accident occurred during the excavation of 8228 working face in Tashan Coal Mine, Tongmei Group. On basis comprehensive geophysical exploration above and below well, order to find out development boundary flowing subsided column distribution characteristics broken body filled it, control by Grouting, boundary, influence zone, cementation fractured are found...

Cooling during drilling Kirschner wires is not always effective in preventing thermal related damage. In this study, we used a human in vitro model and compared temperature elevation, insertion time, and extraction force between three Kirschner wire insertion methods-drilling with and without irrigation and pneumatic hammering. Forty five Kirschner wires were inserted into 15 fresh human cadave...