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Photonuclear reactions on stable isotopes of selenium at bremsstrahlung end-point energies of 10-23 MeV

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Chinese Physics C 2024年第2期48卷 91-103页

作者： F.A.Rasulova N.V.Aksenov S.i.Alekseev R.A.Aliev S.S.Belyshev i.chuprakov N.Yu.Fursova A.S.Madumarov J.H.Khushvaktov A.A.Kuznetsov B.S.Yuldashev Joint institute for Nuclear Research DubnaRussia institute of Nuclear Physics of the Academy of Sciences of the Republic of Uzbekistan TashkentUzbekistan Faculty of Chemistry of Lomonosov Moscow State University MoscowRussia National Research Center"Kurchatov institute" MoscowRussia Skobeltsyn institute of Nuclear Physics of Lomonosov Moscow State University MoscowRussia Faculty of Physics of Lomonosov Moscow State University MoscowRussia institute of Nuclear Physics AlmatyRepublic of Kazakhstan

in this study,experiments were performed at bremsstrahlung end-point energies of 10-23 MeV with the beam from the MT-25 microtron using theγ-activation *** experimental values of relative yields were compared with theoretical results obtained on the basis of TALYS with the standard parameters and the combined model of photonucleon *** isospin splitting in the combined model of photonucleon reactions allows describing experimental data on reactions with proton escape in the energy range from 10 to 23 ***,taking into account isospin splitting is necessary for a correct description of the decay of the giant dipole resonance.

关键词： bremsstrahlung photon cross section isospin splitting giant dipole resonance

Cross-section measurements for the^(58,60,61)Ni(n,α)^(55,57,58)Fe reactions at 8.50,9.50 and 10.50 MeV neutron energies

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Chinese Physics C 2022年第2期46卷 70-78页

作者： Haoyu Jiang Zengqi Cui Yiwei Hu Jie Liu Haofan Bai Jinxiang Chen Guohui Zhang Yu.M.Gledenov E.Sansarbayar G.Khuukhenkhuu L.Krupa i.chuprakov Xichao Ruan Hanxiong Huang Jie Ren Qiwen Fan State Key Laboratory of Nuclear Physics and Technology Institute of Heavy Ion PhysicsSchool of PhysicsPeking UniversityBeijing 100871China Frank Laboratory of Neutron Physics Joint Institute for Nuclear ResearchDubna 141980Russia Nuclear Research Centre National University of MongoliaUlaanbaatarMongolia Flerov Laboratory of Nuclear Reactions Joint Institute for Nuclear ResearchDubna 141980Russia institute of Experimental and Applied Physics Czech Technical University in PragueHorska 3a/22Prague 212800Czech Republic L.N.Gumilyov Eurasian National University Nur-sultan 010000Kazakhstan The institute of Nuclear Physics Ministry of Energy of the Republic of KazakhstanAlmaty 050032Kazakhsta China institute of Atomic Energy Beijing 102413China

Cross sections of the^(58,60,61)Ni(n,α)^(55,57,58)Fe reactions were measured at 8.50,9.50 and 10.50 MeV neutron energies based on the Hi-13 tandem accelerator of China institute of Atomic Energy(CiAE)with enriched^(58)Ni,^(60)Ni,and^(61)Ni foil samples with backings.A twin gridded ionization chamber(GiC)was used as the charged particle detector,and an EJ-309 liquid scintillator was used to obtain the neutron energy *** relative and absolute neutron fluxes were determined via three highly enriched^(238)U_(3)O_(8)samples inside the *** uncertainty of the present data of the^(58)Ni(n,α)^(55)Fe reaction is smaller than most existing *** present data of^(60)Ni(n,α)^(57)Fe and^(61)Ni(n,α)^(58)Fe reactions are the first measurement results above 8 *** present experimental data could be reasonably reproduced by calculations with TALYS-1.9 by adjusting several default values of theoretical model parameters.

关键词： cross-section measurements ^(58 60 61)Ni(n α)^(55 57 58) GiC CiAE

Model-based interpretation of bottomhole pressure records during matrix treatments in layered formations

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Petroleum Science 2024年第5期21卷 3587-3611页

作者： igor Reznikov Dmitry Abdrazakov Dimitry chuprakov Schlumberger Moscow Research Novosibirsk Technology Center

During injection treatments, bottomhole pressure measurements may significantly mismatch modeling results. We devise a computationally effective technique for interpretation of fluid injection in a wellbore interval with multiple geological layers based on the bottomhole pressure measurements. The permeability, porosity and compressibility in each layer are initially setup, while the skin factor and partitioning of injected fluids among the zones during the injection are found as a solution of the problem. The problem takes into account Darcy flow and chemical interactions between the injected acids, diverter fluids and reservoir rock typical in modern matrix acidizing treatments. Using the synchronously recorded injection rate and bottomhole pressure, we evaluate skin factor changes in each layer and actual fluid placement into the reservoir during different pumping jobs: matrix acidizing, water control, sand control, scale squeezes and water flooding. The model is validated by comparison with a simulator used in industry. it gives opportunity to estimate efficiency of a matrix treatment job, role of every injection stage, and control fluid delivery to each layer in real time. The presented interpretation technique significantly improves accuracy of matrix treatments analysis by coupling the hydrodynamic model with records of pressure and injection rate during the treatment.

关键词： Matrix treatment inverse problem Forward problem Skin factor interpretation

Analytical model of 2D leakoff in waterflood-induced fractures

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1713-1733页

作者： igor Reznikov Dimitry chuprakov ilmir Bekerov Schlumberger Moscow Research MoscowRussia

Waterflood-induced fractures,also known as self-induced fractures,spontaneously form at injection wells during *** fractures propagate long distances through rock,allowing injected fluids to travel far away from a well,both within and outside the flooding ***,the me-chanics of waterflood-induced fracture propagation is similar to that of hydraulic fractures,which are intentionally created for reservoir *** models developed for hydraulic fractures can also be applied to waterflood-induced ***,waterflood-induced fractures are typically pumped with much larger volumes of water or brine and grow much longer in *** a result,fluid leakoff from waterflood fractures into the formation is more extensive and two-dimensional(2D),a characteristic that is often ignored in a majority of modern fracturing simulators,making their appli-cation to waterflood fractures *** this work,we revisit the problem of leakoff for long-growing waterflood-induced fractures and develop a new analytical model for fluid leakoff that provides improved predictions of fracture geometry and can be easily implemented in fracturing *** incorporate the developed solution into the classical Perkins-Kern-Nordgren(PKN)model of fracture growth,which shows that the choice of the Carter or a 2D leakoff model greatly impacts fracture ge-ometry at large *** conducted parametric study shows while a toughness-dominated regime af-fects fracture evolution,most of fracture lifetime occurs in a viscosity-and-leakoff-dominated *** also develop an asymptotic solution for a leakoff profile in the limiting case of 2D leakoff domination(~~M and~~K).Finally,we study 3D fracture growth and out-of-zone injection with three layers and a complex structure of *** study shows that ignoring the 2D leakoff during simulation results in a significant overestimation of fracture geometry *** present work,thus,plays an impor

关键词： Waterflooding Leakoff Analytical model Hydraulic fracturing Two-dimensional flow