Tight oil reservoir has big geological reserves but its exploitation is of high cost, so how to achieve economic exploitation has gradually been received attention. In this paper, we take the C oil field as an example, and adopt the combination well spacing of vertical and horizontal wells to establish a geologic model, then discuss the exploitation effect of CO₂ displacement under five different permeability levels and eight different row spacing distributions. Finally, we deeply analyze the economic benefit of CO₂ displacement under different oil prices with the help of economic evaluation criteria. Through the above research, we obtain the following conclusions: When the permeability is between 0.1×10^-3 μm² and 1×10^-3 μm², the C oil company should choose the CO₂ displacement exploitation rather than waterflooding under the current oil price; although decreasing the row spacing will enhance oil recovery, it will decrease the economic benefit, so the C oil company should adopt the appropriate row spacing according to their own current situation; prolonging the productive life will increase the production rate of recovery, but that is no good to the economic benefit, so the C oil company should choose the appropriate productive life by self-condition.

tight oil reservoirs  /  CO₂ displacement  /  vertical and horizontal wells