Abstract:

The start-up pressure gradient existed in the ordinary heavy oil reservoir, the seepage rules could not satisfy the Darcy's rule, and the theory of conventional water production rule was difficult to apply in the ordinary heavy oil reservoirs. On the basis of non-Darcy percolation rule, and the theory of the flow tube method and the oil-water two-phase non-piston water flooding, we derived the calculation formulas of water cut and recovery degree of heavy oil reservoirs in narrow channels, and analyzed the water cut rising rules. The results showed that if the viscosity of crude oil was high, the starting pressure gradient would be great, the rate of water cut would be fast, the width of water sweep zone would be small, and the oil recovery would be low. The reasonable injection and production parameters of narrow channel reservoir could be obtained by the model, which had certain guiding significance for actual reservoir development.

Key words: narrow channel, conventional heavy oil reservoir, start-up pressure gradient, non-piston displacement, stream-tube method, water production rule