To date, the problems of current productivity and water-cut performance calculations for horizontal wells in different regular field development systems have been poorly studied, and the main method of investigation has been the numerical one. In sheet deposits of Western Siberia, Russia, which have nearly equal mobility ratios of oil and injected water, a nearly frontal drive is observed. This aspect is discussed in the present paper.

The report presents a precise analytical solution of steady-state fluid filtration problem in six regular development systems where horizontal wells are applied. The solution allows the derivation of analytical expressions for the rate, pressure field and filtration velocities, water-free operation time, flooding factor during water-free and water periods of operation, water-cut performance for horizontal wells, and flood front.

Graphic illustrations allow a visual evaluation of the operation character for different sections of the horizontal well, location of unusable zones in a number of well patterns with horizontal wells applied.

The paper shows the influence of the horizontal well length, distance between wells in rows and between well rows upon rate, velocity field of filtration, water-cut time, flooding factor, water-cut dynamics for horizontal wells, and the form of the flood front.

A quantitative range of effective and ineffective applications of horizontal wells is given for each system, depending upon the length of the horizontal section, injection well type (vertical or horizontal), distance between wells in rows and distance between well rows.

The author believes that the paper is very important for a better understanding of flooding processes in field development systems where horizontal wells are applied, and it gives an idea of the way various parameters that characterize the geometrical location of horizontal well systems, influence the deposit operation parameters. The author uses the results to construct a rational 3D hydrodynamic model of Western Siberian reservoirs with reference to a detailed description and the number of cells.

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