Development of engineering solutions for air drilling at Dulisminsk oilfield, Irkutsk oblast

The article presents the analysis of disastrous mud loss achieved during casing at Dulisminsk oil and gas condensate field (DOGCF) and comparative evaluation of geological structure of DOGCF and Naryksko-Ostashkinsk area of Kemerovo oblast, where the same problem was solved successfully. On the basis of the analysis, an engineering solution is proposed to prevent mud loss in the conditions of DOGCF

Vertical section construction of wells at Kuyumbinsky oil field via percussive-rotary drilling with DTH hammer

The article presents the analysis of sequential use of mobile percussive-rotary drilling sets with DTH hammer and bottom-hole cleaning by foam mud in construction of vertical sections along with at Kuyumbinsky oil field. On the basis of the analysis, an engineering solution is proposed to prevent disastrous mud loss that is the key factor of efficiency in implementation of resource-saving technologies

Development of engineering solutions for air drilling at Dulisminsk oilfield, Irkutsk oblast

The article presents the analysis of disastrous mud loss achieved during casing at Dulisminsk oil and gas condensate field (DOGCF) and comparative evaluation of geological structure of DOGCF and Naryksko-Ostashkinsk area of Kemerovo oblast, where the same problem was solved successfully. On the basis of the analysis, an engineering solution is proposed to prevent mud loss in the conditions of DOGCF

First Results from the AMoRE-Pilot neutrinoless double beta decay experiment

The Advanced Molybdenum-based Rare process Experiment (AMoRE) aims to search for neutrinoless double beta decay (0$\nu\beta\beta$) of $^{100}$Mo with $\sim$100 kg of $^{100}$Mo-enriched molybdenum embedded in cryogenic detectors with a dual heat and light readout. At the current, pilot stage of the AMoRE project we employ six calcium molybdate crystals with a total mass of 1.9 kg, produced from $^{48}$Ca-depleted calcium and $^{100}$Mo-enriched molybdenum ($^{48\textrm{depl}}$Ca$^{100}$MoO$_4$). The simultaneous detection of heat(phonon) and scintillation (photon) signals is realized with high resolution metallic magnetic calorimeter sensors that operate at milli-Kelvin temperatures. This stage of the project is carried out in the Yangyang underground laboratory at a depth of 700 m. We report first results from the AMoRE-Pilot $0\nu\beta\beta$ search with a 111 kg$\cdot$d live exposure of $^{48\textrm{depl}}$Ca$^{100}$MoO$_4$ crystals. No evidence for $0\nu\beta\beta$ decay of $^{100}$Mo is found, and a upper limit is set for the half-life of 0$\nu\beta\beta$ of $^{100}$Mo of $T^{0\nu}_{1/2} > 9.5\times10^{22}$ y at 90% C.L.. This limit corresponds to an effective Majorana neutrino mass limit in the range $\langle m_{\beta\beta}\rangle\le(1.2-2.1)$ eV

Structural, optical and luminescent properties of undoped Gd3_3Alx_xGa5−x_{5-x}O12_{12} (x = 0,1,2,3) and Gd2_2YAl2_2Ga3_3O12_{12} single crystals

The studies of structural, optical and luminescent properties of undoped Gd$_3$Al$_x$Ga$_{5-x}$O$_{12}$ (x = 0,1,2,3) and Gd$_2$YAl$_2$Ga$_3$O$_{12}$ mixed crystals were carried out. Mixed crystals composition and lattice parameters were determined using EDX and XRD techniques. The distribution of cations between sites with different symmetry was obtained using Rietveld method. The spectral dependence of refraction coefficients was determined using the multiangle spectrophotometry method and Cauchy equation. Optical band gap values were determined from the absorption spectra in the region of fundamental absorption edge. Presence of two non-equivalent Gd3+ emission centers was supposed from the analysis of emission spectra. The energies of exciton creation and band gap energies were obtained from the luminescence excitation spectra analysis

Structural, optical and luminescent properties of undoped Gd3AlxGa5-xO12 (x = 0,1,2,3) and Gd2YAl2Ga3O12 single crystals

The studies of structural, optical and luminescent properties of undoped Gd3AlxGa5-xO12 (x = 0,1,2,3) and Gd2YAl2Ga3O12 mixed crystals were carried out. Mixed crystals composition and lattice parameters were determined using EDX and XRD techniques. The distribution of cations between sites with different symmetry was obtained using Rietveld method. The spectral dependence of refraction coefficients was determined using the multiangle spectrophotometry method and Cauchy equation. Optical band gap values were determined from the absorption spectra in the region of fundamental absorption edge. Presence of two non-equivalent Gd3+ emission centers was supposed from the analysis of emission spectra. The energies of exciton creation and band gap energies were obtained from the luminescence excitation spectra analysis