The successful use of waterfrac to tight gas reservoirs was presented by M.J. Mayerhofer et al[13]. However, its application to stimulate permeable oil reservoirs is not reported to our knowledge scope. This paper presents the application of waterfrac to a shallow oil reservoir with low permeability, reservoir M of Laojunmiao oil field (the oldest oil field of China). The average permeability of reservoir M is 24.2 mD. The use of waterfrac to the permeable reservoirs is a different scenario from that to tight reservoirs because the higher fracture conductivity is required in order to ensure the fracture's flow capability. The more than forty-year history, development, optimization and application effect of waterfrac to reservoir M are given out in this paper.

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