Switchable oil-extraction and water-injection integrated production pipe column

The invention discloses a switchable oil-extraction and water-injection integrated production pipe column comprising an in-well sleeve, an oil pipe, a downhole safety valve and an electric submersible pump. Packers are arranged in the positions, located below the downhole safety valve, between the oil pipe and the in-well sleeve. A working barrel and a flow-channel conversion nipple are sequentially arranged in the positions, located below the packers, on the oil pipe. The flow-channel conversion nipple comprises a one-way valve and a bypass valve. When water is injected from the exterior of a well into the oil pipe, under the water pressure, the one-way valve is closed, the bypass valve is opened, and the water injected into the oil pipe flows into the in-well sleeve through the bypass valve. When the electric submersible pump starts to extract oil or discharge water towards the exterior of the well, under the oil pressure or the water pressure, the one-way valve is opened, the bypass valve is closed, the oi