Research on Energy Supplement Development Mode of High Angle Oil Well in Ultra-low Permeability Reservoir

Changqing ultra-low permeability reservoir is tight, and it can only improve the initial production of this kind of reservoir by adopting high inclination or horizontal well type and forming complex fractures through fracturing transformation. However, the initial decline is large. At the same time, affected by natural fractures, pressure fractures and dynamic fractures, water injection will lead to rapid water breakthrough in oil wells. In view of the above problems, on the basis of previous theoretical research and field practice, the development method of water injection huff and puff to supplement energy in highly deviated oil wells is proposed. Water injection huff and puff can effectively supplement formation energy and improve single well production. Through numerical simulation, the effects of fracture half-length, injection pressure, water injection timing, water injection rate, water injection rate, well shut-in time and other factors on the huff and puff effect are studied, and the relevant parameters of water injection huff and puff for ultra-low permeability reservoirs are determined. The field practice has confirmed the effectiveness of water injection huff and puff, and has achieved certain stimulation effect. Water injection huff and puff can become a water injection development mode to play the potential of ultra-low permeability.