The thermal effect estimation of the bottomhole formation zone treatment by heat-producing binary mixtures

UDK: 622.276.65
DOI: 10.24887/0028-2448-2018-6-122-126
Key words: Thermal gas chemical methods, binary aqueous mixture, heavy oil production stimulating methods, multiphase filtration in a porous media
Authors: V.E. Vershinin (Tyumen State University, RF, Tyumen), A.I. Varavva (Tyumen State University, RF, Tyumen), A.V. Tatosov (Tyumen State University, RF, Tyumen), A.N. Lishchuk (MC HMS Group LLC, RF, Moscow)

The article is concerned with methods of stimulating production by the injection of chemically active components (binary mixture) into the bottomhole zone of the high viscos oil reservoir. The method is about injected chemical reagents reaction into the well, resulting in gas and heat emission after decay. Consequently, the bottomhole formation zone is heated, the oil viscosity reduces, a clogging of bottomhole zone disappears, waxes are washed out and the natural fracturing of the carbonate reservoirs increases.

In distinction from widely used steam well treatment, the heat loss in downhole and surface equipment is negligible, due to direct bottomhole heating by binary mixture. Unlike classic thermal gas chemical methods conducted into the well bore, binary mixture treatment is directly initiated in reservoir. As a result, a larger reservoir’s volume will be heated.

Mathematical model filtration of chemical reagent mixture was proposed. Numerical solution of equations set based on IMPES (implicit pressure, explicit saturation) method. The simple iteration method was used for non-linear terms calculation. Binary mixture treatment of vertical well was considered. Estimation of the additional oil production, which obtained as a result of borehole formation heating and oil viscosity reducing, is made. Calculations are carried out for various formation permeability, well water cutting and oil viscosity. The proposed concept of calculation, graphs and result charts can be used to approximate estimation of the effect of binary mixture treatment and searching suitable wells for these treatments.


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