Modeling the acidizing of a horizontal well opening a carbon-bearing oil reservoir

The model of two-phase seepage flow occurring when oil is displaced by an acid solution in the neighborhood of a horizontal well is considered with account for flow in the well bore. The effect of acid activation and acid fracturing is studied. The influence of the phase permeability variations accompanying the rock break-up on the treatment result is estimated. The nonuniformity of the inflow distribution along the horizontal bore is shown to increase as a result of the acidizing. Numerical calculations are carried out for actual situations.     

Multiscale Simulation of Acid Treatment in a Carbonate Reservoir

Fluid Dynamics - The problem of acid treatment in carbonate reservoirs at different scales is considered. The problem of two-phase multicomponent Darcy flow through a porous medium with chemical...     

Reaction of SeOCF3 and SeO2CF3 groups with π-electron systems in ground and excited states

The dipole moments and ultraviolet spectra were measured for selenium compounds containing SeOCF₃ and SeO₂CF₃ groups. It is shown that in the ground state the SeO₂CF₃ group has a greater tendency toward conjugation with the -electron system of the benzene ring thandoes the SeOCF₃ group. In the ground state, selenium compounds containing SeOCF₃ and SeO₂CF₃ groups have a smaller conjugation effect than corresponding sulfur compounds. Oxidation of SeCF₃ to SeOCF₃ decreases the degree to which the uncollectivized electrons of selenium take part in conjugation with electron-accepting groups. In the unexcited state the free electrons of selenium in SeCH₃ and SeCF₃ groups are more mobile than those of sulfur in SCH₃ and SCF₃ groups, and the * level of the Se=O groups is lower than that of the S=O group.     

Efficiency of the production of γ families with halos and the fraction of protons at an energy of 10<Superscript>16</Superscript> eV

γ Families with halos detected in the “Pamir” experiment have been analyzed. Comparison of the experimental data with the results of calculation within the quark-gluon string model (MC0 code) made it possible to determine the efficiency of halo formation by protons, α particles, and heavy nuclei, as well as the fraction of protons in the mass composition of primary cosmic rays at an energy of 10¹⁶ eV. It is shown that halos are formed predominantly by protons. The fraction of protons in the mass composition of primary cosmic rays at an energy of 10¹⁶ eV is 20%.     

A new method of XREC data processing based on recognition and analysis of CCD images and simulation of direction of γ families in XREC by the ECSim2.1 program

The passage of γ families through X-ray emulsion chambers (XRECs) is simulated and XREC-induced variations in different characteristics are analyzed. Experimental measuring procedures are also simulated; a new approach to recognition of overlapping dark spots in the families based on the Relay criterion is applied; the comparative analysis of the data of PAMIR experiment and model calculations with regard to the XREC response and measuring procedures is presented.     

Self-similar solutions of problems of two-phase flow through porous media with allowance for the compressibility of one of the phases

Self-similar problems of mutual displacement are solved with allowance for the compressibility of one of the phases. It is found that when an incompressible liquid is displaced by a gas the extent of displacement increases. The mutual displacement of gas-liquid mixtures results in the formation of not one but several saturation jumps, i.e., the structure of the displacement zone is much more complex.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 1, pp. 71–80, January–February, 1990.The authors are grateful to V. I. Maron for useful discussions.