[en] Geophysical logging has an important role in in-situ leaching uranium mining. Based on the date of the geophysical logging, it can be divided into the strata and lithology, determined the location and grade of the ore, applied to check the cementing and quality of the well in in-situ leaching uranium mining. This paper mainly focuses on the effect of gamma logging, spontaneous potential logging, density logging, sonic logging, well temperature logging, current logging, well deviation logging in checking cementing and quality of the well, and explains the geophysical logging is an effective method in in-situ leaching uranium mining. (authors)

[en] This paper describes a comparative study of the thermal behaviour of drilling fluids and the surrounding rock when air-water mixtures and conventional muds are used as drilling fluids in geothermal wells. The computations were performed with two numerical simulators: TEMLOPI/V.2, which is used to compute the transient temperature disturbance when mud is employed, and GEOMIST, which is used when air-water mixtures are employed as drilling fluid. Data from a well from the Las Tres Virgenes Mexican geothermal field are used in this analysis. The results of simulation include temperatures computed during circulation and shut-in, and the latter results are compared with temperatures logged during drilling stoppages. It was found that the thermal disturbance caused by circulation of an air-water mixture has a smaller thermal effect than the thermal disturbance caused by drilling muds

[en] Rocket (Eruca sativa) salad is commercially important it is taken as freshly cut ready to make salads necessary as nutritional characteristics. In the present study, alcoholic, flavonoid and anthocyanin extracts of E. sativa leaves cultivated in Kurdistan Region of Iraq was determined by in several methods including β -Carotene- linoleic acid assay, reducing power assay, H₂O₂scavenger, and total antioxidant capacity. The antioxidant activity of fresh rocket leaves was determined as well. Temperature, pH and storage time that effecting on their activity as antioxidant was also studied. The results illustrate that alcoholic extract yield was 29.13%, about 25.2 % of alcoholic are flavonoid compound, while anthocyanin yield 18.8% (g/g raw material). Total phenolic contents in E. sativa, have been quantified using beer law. Total flavonoid contents were also measured. The study shows that E. sativa is a good source of phytochemicals (total phenols 5, 3.3, and 1.3 mg TAE/g raw materials) and (total flavonoid 0.81, 1.04 and 0.44 mg QE/g raw materials) for alcoholic, flavonoid and anthocyanin extracts, respectively. All extracts illustrated high antioxidant potential. PH, thermal study and storage which carried to detect the remaining activity of the plant extracts show that antioxidant activity reduced with increasing the time of boiling, storage and different pH values. (paper)

[en] In the paper unlike the classical methods as Clausius, Caratheodory and other ones a new axiomatic method has been developed for construction of foundation of thermodynamics and statistical physics. Principles of temperature and entropy existence are proved in a new fashion. Canonical and main canonical distributions, Bose and Fermi distributions are derived. The oscillator ensemble model is introduced to describe fluctuations and on the basis of that a new fluctuation relations are obtained, in particular, coincident with Heisenberg indeterminancy principle. (author)

[en] World energy demand is increasing and non-renewable resources are decreasing by exponentially putting a huge burden on the energy sector specifically on the oil and gas industry. To overcome these challenges, renewable energy is the best option with production optimization in the oil and gas sector. However, among all renewable energies, geothermal is the most suitable energy due to its sustainability and presence around the clock. Moreover, there are three types of wells for harnessing geothermal energy such as: producing oil and gas well, abandoned oil and gas wells and geopressured brine well with dissolved gas. In this research study, the author’s considers the technical aspects of electricity generation through oil and gas wells. The power capacity of these wells is determined by the production rate of the well mass flow (m) and temperature (T) of these wells. The main factors that control the wellhead temperature are mass flow rate and formation temperature. Our assessment of gas-producing well in the Kandhkot region showed the wellhead temperature of the produced fluid is too low, compared to ambient temperature for commercial generation of geothermal power. In our work, a conceptual design system to produce power from produced gas by using Solid Works Software is proposed and we have found some positive results. Seven well from the Kandhkot gas field were selected with different mass flow rates and negligible wellhead temperature difference. Author’s found the minimum power net output 21kW at the gas mass flow rate of 0.098504 kg/s with 7.5% thermal efficiency and maximum net output 27.5 kW at gas mass flow rate of 4.102524 kg/s with 10% thermal efficiency. The overall net output power produced from seven well is 174kW and can supply to local communities. (author)

[en] 0.5BiGd_xFe_1−xO₃−0.5PbTiO₃ with x=0.05, 0.10, 0.15, 0.20 composite was prepared by mixed oxide method. Structural characterization was performed by X-ray diffraction and studied that the materials show tetragonal structure at room temperature for all concentration of Gd. Studies of dielectric properties (ε_r and tanδ) of the above compound at different frequencies in a wide range of temperature (25°-500°C) with an impedance analyser revealed that the dielectric constant increases with increase in Gd concentration as well temperature and the compound do not have any dielectric anomaly in the studied frequency and temperature range

[en] Highlights: • Depressurization and thermal co-stimulation using horizontal well were proposed. • 3D stimulation showed that gas release rate was 3 × 10⁵ m³ per day within 450 days. • 2D stimulation showed that Class 3 hydrates could be dissociated within 8500 days. • 2D Simulation showed that heat flow was 1620 W lasting 1500 days, and decreased fast. • 1.1× 10⁵ kg water was collected within 2000 days and then no more water was produced. - Abstract: Class 3 hydrate reservoirs exploiting using horizontal well by depressurization and thermal co-stimulation was simulated using the HydarteResSim code. Results showed that more than 20% of hydrates in the reservoirs had been dissociated within 450 days at the well temperature of 42 °C and well pressure of 0.1P₀, 0.2P₀ (P₀ is the initial pressure of the reservoirs, simplifying 42 °C and 0.1P₀, 42 °C and 0.2P₀). While the production behavior of 42 °C and 0.5P₀, 42 °C and 0.8P₀ were not so exciting. In order to understand the production character of the well in long term, the cross section of 1 m length reservoirs was simulated. Simulation results showed that 4.5 × 10⁵ m³ gas would be collected within 4500 days and 1.1 × 10⁶ kg water could be produced within 1500 days in the well at 42 °C and 0.1P₀. 3.5 × 10⁵ m³ gas would be collected within 8500 days and 1.1 × 10⁶ kg water could be produced within 1500 days in the well at 42 °C and 0.2P₀. The heat flow was 1620 W at the beginning and then decreased rapidly in the two cases. For reservoirs of 1495.2 m in length, about 6.7 × 10⁸ m³ and 5.3 × 10⁸ m³ gas would be collected in the well corresponding to conditions of 42 °C and 0.1P₀, and 42 °C and 0.2P₀

[en] Radioisotope microball tracer which was produced by new process is applicable to injection profiling in low injection rate wells. Five-parameter combo logging tools were developed, which enhance accuracy and reliability of log by integrating interpreting flowrates inside tubing, shut-in and flowing well temperatures and tracing results. Reliable impulse oxygen-activation logging tools and a tracer logging method with correlation arithmetic were developed to meet the need of profiling polymer injectors. These new techniques are widely used in injection profile logging at Daqing oilfield. (authors)

No abstract available

[en] The CARTODIM project aims to continue collecting, banking, analyzing and distributing thermal response test (TRT) reports, as well as developing the closed-loop geothermal exchanger sizing platform for professionals. By the end of March 2023, 96 additional TRT reports had been banked, bringing to 511 the number of TRT results available online at www.geothermies.fr. The interface of the probe field sizing platform has been improved. Users can now load their own water law and calculate the initial ground temperature based on the geographical coordinates of their project. Nearly 90 professionals were trained to use this tool during 10 training sessions