Method for enhancing recovery ratio through three-dimensional streamline regulation of water drive reservoir

Abstract

The invention discloses a method for enhancing recovery ratio through three-dimensional streamline regulation of a water drive reservoir. The method is characterized by comprising the following steps: identifying the planer development segment and vertical development segment of a preferential seepage channel to quantificationally calculate sampling parameters; establishing a three-dimensional geologic model comprising the characteristics of the preferential seepage channel, establishing a reservoir numerical simulation model, and finely determining a residual oil distribution characteristic under current heterogenous condition through reservoir numerical simulation; carrying out pattern modification and optimized water shutoff and profile control design; and determining whether layered injection and recovery is required according to water adsorption characteristics of a vertical water well and liquid generation characteristics of an oil well by utilizing the reservoir numerical simulation result. In the invention, on the basis that the preferential seepage channel is blocked through deep profile control and water shutoff, the planer flow line direction is changed through the combination water shutoff and profile control with pattern modification optimization, water shutoff and profile control are optimally combined with subdivided development layers and layered injection and recovery optimization to control and regulate the density of vertical flow lines, and the purpose of maximally control underground flow lines is achieved through the synergistic effect of different means.

Description

technical field [0001] The invention relates to a method for increasing the recovery rate of a water drive oil reservoir, in particular to a method for improving the recovery rate of a water drive oil reservoir by regulating and controlling three-dimensional streamlines. Background technique [0002] At present, the main enhanced oil recovery technologies related to streamline control mainly include the following aspects: (1) Adjustment of development strata and well pattern: After the oilfield is put into development, in order to obtain better development effects and higher economic benefits , the oilfield needs to be continuously adjusted, and the most important adjustment method is the adjustment of the development layer and well pattern. Multi-reservoir heterogeneous reservoirs often contain many oil sand bodies or single layers, and the development plan formulated at the initial stage of oilfield development is generally based on the main oil reservoirs with large distr...

AI Technical Summary

Problems solved by technology

Existing technologies have their own characteristics and emphases, and they are mainly applied in a single way in the mining field. They have not yet been organically combined according to their own characteristics to achieve the synergistic effect of different means