Remediation of the old ecological load in the protected area of the Morava river - re-abandonment of the oil and gas production wells

The presence of the former oil and gas producing wells that are or can be improperly abandoned creates a possible environmental hazard in terms of contamination of the groundwater and soil in the present. In the area of the Czech Republic, specifically in South Moravia part, which has a long oil and gas production history, plenty of such wells can be found. Finding out the information about their abandonment in archives is often very demanding (sometimes even impossible). During various survey works and re-abandonment attempts it was found out that many wells are originally abandoned improperly, insufficiently or not at all. The occurrence of such wells is not just potential but also very actual hazard for the cultural landscape of the South Moravia, especially for aquifers, agriculture and natural protected areas of national significance. This paper is focused on the possibility of the definitive abandonment of this particular ecological load. The proposed method was verified in laboratory conditions and in the field. It is now a standard form of the re abandonment of oil and gas wells without precise localization in the South Moravian oil fields.Web of Science3018

Petrologie a geochemie rulových hornin Kry Pradědu desenské skupiny

PrezenčníNeuvedenoNeuveden

Granáty východní části Hrubého Jeseníku a jejich význam pro petrologické aplikace

Import 20/04/2006Prezenční výpůjčkaVŠB - Technická univerzita Ostrava. Fakulta hornicko-geologick

The significance of textural and structural properties of North-Moravian basaltoids for the manufacture of mineral fibres

The present criteria which basaltoids for petrurgical* purposes should meet are generally regarded as being associated with the qualitative and quantitative parameters of their chemical and mineralogical composition. However, in petrurgical practice one can observe the phenomenon that rocks with virtually identical compositions show variable technological properties during the melting and subsequent processing. This is also the case of alkaline olivine basalt and nepheline basanite from the Bíleice locality (12 km SE of Bruntál) used in the manufacture of rockwool. This variability of petrurgic properties, shown in spite of a relatively very stable chemical and mineralogical composition of the raw material, was the reason why the rocks were subject to a detailed petrographic and geochemical study. This study resulted in the finding that in assessing the raw materials for petrurgical processing according to their chemical and mineralogical composition, attention should also be paid to the textural and structural characteristics of the respective rocks

Mine waters in the Czech Republic - Current situation and trend development

In the Czech Republic are mine waters well defined by Directives No. 254/2001 and No. 44/1988. Pumped mine waters from strip or underground mines are affected by increased volumes of iron cations, manganese cations, sulphates anions, acid carbonates and by acid pH. Excess limit volumes of dissolved solids are typical. The concentration of characterised pollution of mine waters does not allow direct discharge of these waters into the surface waters, not even their utilization without previous modification or treatment. Mine waters treatment technology on particular localities could be characterised as mechanical–chemical processes, including processes of solid matter sedimentation and further neutralization. This procedure ensures quality of treated waters for its discharge into the surface waters almost in all limited parameters of pollution. Exception is formed by excess limit concentration of dissolved solids (over 1,000 mg/l) and excess limit concentration of sulphates (over 300 mg/l). Chemical desulphuration processes represented by precipitation are advantageous methods with regards to realization possibilities and costs. Therefore, at the Faculty of Mining and Geology, VSˇB-TU Ostrava, the fundamental attention was devoted to applications combining natural friendly calcic and aluminic ions that ensure reliable removal of sulphates. As the most suitable processes of current mine waters treatment appear to be tertiary processes, especially membrane technologies which are situated behind very effective pre-treatment removing solid particles. Membrane technologies could be used in procedure of final treatment as an advanced technology, which provide both demineralized water (permeate) and saline concentrate. Both products are for further commercial utilization