Investigation of Water Composition on Formation Damage and Related Energy Recovery from Geothermal Reservoirs: Geochemical and Geomechanics Insights

The main challenge in extracting geothermal energy is to overcome issues relating to geothermal reservoirs such as the formation damage and formation fracturing. The objective of this study is to develop an integrated framework that considers the geochemical and geomechanics aspects of a reservoir and characterizes various formation damages such as impairment of formation porosity and permeability, hydraulic fracturing, lowering of formation breakdown pressure, and the associated heat recovery. In this research study, various shallow, deep and high temperature geothermal reservoirs with different formation water compositions were simulated to predict the severity/challenges during water injection in hot geothermal reservoirs. The developed model solves various geochemical reactions and processes that take place during water injection in geothermal reservoirs. The results obtained were then used to investigate the geomechanics aspect of cold-water injection. Our findings presented that the formation temperature, injected water temperature, the concentration of sulfate in the injected water, and its dilution have a noticeable impact on rock dissolution and precipitation. In addition, anhydrite precipitation has a controlling effect on permeability impairment in the investigated case study. It was observed that the dilution of water could decrease formation of scale while the injection of sulfate rich water could intensify scale precipitation. Thus, the reservoir permeability could decrease to a critical level, where the production of hot water reduces and the generation of geothermal energy no longer remains economical. It evident that injection of incompatible water would decrease the formation porosity. Thus, the geomechanics investigation was performed to determine the effect of porosity decrease. It was found that for the 50% porosity reduction case, the initial formation breakdown pressure reduced from 2588 psi to 2586 psi, and for the 75% porosity reduction case it decreased to 2584 psi. Thus, geochemical based formation damage is significant but geomechanics based formation fracturing is insignificant in the selected case study. We propose that water composition should be designed to minimize damage and that high water injection pressures in shallow reservoirs should be avoided.

Flood vulnerability reduction. Case study: Tazlău river basin, downstream of its confluence with Tazlău Sărat

The issue of water management as well as its impact on the community has been both a challenge and a concern of the European Union, which lead to adopting the Directive 2007/60/EC with the purpose of establishing a framework for the assessment and management of flood risks, by which the member states had to identify the areas for which they conclude that potential significant flood risk exist or likely to occur and to develop flood risk management plans and measures to reduce the consequences of flooding. In this respect, the Siret Water Basin Administration has declared the area of the Tazlău river, as a significant flood risk area (A.P.F.S.R.) (*** A.B.A Siret). The Tazlău River is a left-bank tributary to the Trotuș River, passing through the ten communes and partially through the outside the built-up areas of Onești city. Recent studies have shown the benefits of reservoirs and floodplains, as these provide the most effective way to buffer the effect of floods by slowing and spreading the discharge of a river (Băloi, 1980). By restoring and improving an existing lateral floodplain in the Tazlău River basin, in order to store part of the floodwaters that cause significant adverse consequences, will reduce the flood vulnerability of its crossings.

ANALYSIS OF DIFFERENCES THE INTEREST IN PAYING INCOME TAX AFTER TAX REDUCTION (CASE STUDY IN THE SME OF THE FOOD INDUSTRY AND THE TEXTILE INDUSTRY).

The reduction of SME income tax has caused controversy. This study aims to determine and analyze differences the interest in paying taxes after the reduction of income tax, especially in the food industry and textile industry. The population in this study is all SME engaged in the food industry and textile industry in Surabaya and Sidoarjo. Based on the test results, it can be concluded that the policy of reducing the income tax rate shows a positive response from SMEs. The results of this study also show that there is no difference in responses from both the food and textile industries.

MICROFINANCE AS A TOOL FOR POVERTY REDUCTION: CASE OF WESTERN BALKAN COUNTRIES

Microfinance is of a vital importance to the unprivileged people especially in the developing countries. People with no means of sustaining themselves, rely on microfinance for a variety of services as a means for poverty reduction and increasing happiness. This study employs a Fixed Effects Model to analyze the impact of microfinance and some other macroeconomic factors on poverty reduction in Albania, Montenegro and Bosnia and Hercegovina. Empirical findings suggest that inflation does not play a role on the poverty reduction. On the other hand, total output (GDP) and microfinance (GLP) are found to be highly statistically significant in explaining the poverty reduction in the respective countries. Therefore, putting serious efforts on increasing GDP and supporting microfinance institutions may help the countries reduce the poverty level. Keywords: Western Balkans, microfinance, GDP, poverty reduction, fixed effects model

Intussusception and COVID19, Successful Mechanic Reduction, Case Report

The COVID 19 pandemic has greatly affected the world population. SARS CoV2 infection in pediatric patients is related to the development of mild symptoms and in some cases gastrointestinal manifestations. We present the case of a patient with intussusception as a manifestation associated with SARS CoV2 infection, treated by ultrasound-guided hydrostatic reduction with successful results.