Injection-production mode capable of increasing yield of high-crack type buried hill oil pool high-water-content oil well

Abstract

The present invention proposes an injection-production method for increasing the output of high water-cut oil wells in fractured buried-hill reservoirs, comprising the following steps: 1) continuously injecting water into each water injection well, and shutting down the oil wells corresponding to each of the water injection wells without producing oil; 2) When the formation pressure level returns to 80% of the original formation pressure, the water injection well is shut down, and the oil well is opened to produce oil. The purpose of the present invention is to provide an injection-production method for the production effect of oil wells in the later stage of water injection development of fractured buried hill reservoirs, which can increase the production degree of remaining oil, increase the water injection swept volume and single well production, and reduce the cost of ineffective water injection.

Description

technical field [0001] The invention relates to an injection-production method for increasing the production of oil wells in the late stage of water injection development of fractured buried hill reservoirs, adjusting the production pressure difference between injection and production wells in the late stage of reservoir development, and changing the flow rate of fractured buried hill reservoirs in the late stage of water injection development Advantageous migration direction, increase water injection swept volume and single well production, and reduce invalid water injection cost. Background technique [0002] Fractured buried hill reservoirs mostly have a dual-media structure, and the reservoir rocks are composed of fractures and pores. In the dual medium, the matrix supplies fluid to the fractures, and the fluid flows along the fractures to the bottom of the well before being produced. Since the permeability of the fractures is much greater than that of the matrix, the in...

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Problems solved by technology

In the dual medium, the matrix supplies fluid to the fractures, and the fluid flows along the fractures to the bottom of the well before being produced. Since the permeability of the fractures is much greater than that of the matrix, the injected water from the water injection well 11 mainly migrates along the direction of the main fractures 12 (see figure 1 In the direction of the arrow in the middle), and then produced by the oil well 13; in the long run, the oil in the main fractures is harvested, and the oil in the matrix 14 cannot be effectively produced, so invalid water injection is formed, the water cut of the oil well rises rapidly, and the recovery degree is low

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