Abstract:The oil and gas production from some old wells in Changqing Oilfield has not significantly increased after the re-fracturing.To understand this issue,we use microseismic monitoring to analyze repeated fracturing effects.We evaluate re-fracturing effects based on local stress rather than the steering and perforation.The local stress of old wells changes with long-term injection.It is necessary to have an understanding of the stress direction changes and then choose the appropriate fracturing scheme.The temporary plugging agent and directional perforation used in the old well can form certain turning effects on fractures near the perforation point,but in an area far from the perforation point,the fracture still extends along the direction of the maximum principal stress.This understanding provides guidance for the repeated fracturing optimization of old wells.
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