Fracturing technology of intensified water injection wells in low permeability areas of Liubei Oilfield

The oil reservoir in low permeability areas of Liubei Oilfield features in strong water sensitivity,strong stress sensitivity,and plastic properties.Based on systematic research and analysis of reservoirs,this paper studies the injection well fracturing technology and the dual anti-swelling fracturing fluid system.The technology combines the clay stabilizers of acid properties used for protecting reservoirs with the inhibitors for anti-swelling of clay to prevent the hazards caused by swell,diffusion,and migration of clay.Taking the effect of plastic formations on effectively propping fractures into account,the length of fractures and the quality of sand absorbed are optimized.Based on using the optimal injection well control technology,the effect of stress sensitivity on intensified injection is removed.Therefore,the construction scale is decreased,the construction cost is reduced,and the fracturing treatment of injection wells is enhanced.The technology has been applied to the low permeability areas of Liubei Oilfield,which achieves good intensified injection results.