Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie Number 12/2012

The level of natural hazards in Polish mines has been increasing in recent years, along with the extraction of coal seams being bedded at ever greater and greater depth. There is now a widespread conviction that, regardless of development of mining systems, development of hazards prevention methods and combating of hazards with ventilation means a continuous development of reliable monitoring and control systems of hazards is indispensable. The article presents the results of the review of equipment of mines with automatic gasometry systems, including sensors for control and monitoring of physical and chemical parameters of air flow in mine workings. The review has been performed on the basis of a developed questionnaire [3], which has been sent to the mines, and the received responses allowed to show the current status and development trends with regard to methane and fire hazards monitoring systems, and ventilation control used in Polish hard coal mines. The results of similar surveys conducted in 1995 [1] and 2003 [2] have been used as a basis for comparison.

This publication deals with the issue of acoustic power emitted by machines and equipment used in oil drilling industry, that has pronounced impact on the performance of drilling crew and creates discomfort for environment. Pilot tests were performed on oil well objects in order to achieve the data permitting to create a computer spreadsheet. It permits to calculate, in relatively short time, acoustic power level that is emitted by oil industry machines and auxiliary equipment, and to supplement the documentation of technical equipment as required by EU recommendations.

The article presents the geological and mining conditions effect on output disintegration. The assessment of the degree of disintegration was based on the observation of blasting works in several limestone mines. First, a photographic documentation of the output was made. Then, the photographs were analyzed for particle distribution using a photogrammetric method. For that, Split Desktop 2.0 software was used. The achieved results confirm the impact of the location of the cut on the output product grade and the increase in the disintegration degree with distance from the first blasted cut. In deposits of variable geological specifications, a larger number of oversized lumps and a larger number of regular grades.

In order to increase recovery of gas and oil from deposits some technologies called Enhanced Gas Recovery with injection of CO2 are used. In this process isotopic effects are expected. Therefore we have analyzed isotopic composition of carbon and hydrogen in methane in one EGR object. Carbon and hydrogen stable isotopic observations of methane from the EGR object have been carried out since September 2009. Both spatial and temporal variations in carbon and hydrogen isotopic ratios in methane show that the system is very dynamic. It has been observed clearly that there are some preferential paths of methane transportation through the deposit, what resulted in isotopic effects. Namely, the carbon and hydrogen isotopic ratios show that the front of the highest velocity of methane movement is marked by the lowest isotopic ratios.