Abstract The 3.1- and 3.7-km-deep FFC-1 DGE-1 geothermal explorations wells drilled into the Precambrian crystalline basement on southern margin of Fennoscandian Shield are evaluated regarding experiences from drilling, geological conditions, thermal properties. Both penetrate an approximately 2-km-thick succession sedimentary strata before entering basement, dominated by orthogneiss, metabasit...

The extraction of oil and gas typically involves drilling boreholes through various subsurface strata. Abrupt variations in the formation properties can severely compromise borehole stability if process is not adequately controlled. Certain events result influx/efflux fluids fissures or fractures wall. This causes a destabilization operation known as “kick” which, controlled, may lead to seriou...

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...

A 49-year-old man was referred to our department with profuse serous fluid discharge from a Penrose drain after undergoing internal fixation with metal screws for multiple pelvic bone fractures. A definite ureteral penetration was identified that was orientated from the lateral to the medial aspect of the right distal ureter. The patient was surgically treated with excision of the 2-cm injured ...

The key to improving the efficiency of supercritical carbon dioxide (SC-CO2) jet drilling and completion is clarify mechanism SC-CO2 breaking coal. A large proportion tiny coal powders appear during breaking. However, there no theory explaining this phenomenon. This study analyzed cause phenomenon from perspective phase change in microcracks Scanning electron microscope experiments were used co...

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...

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...