In view of the pollution phenomenon of double drops of liquid production rate and bottom hole flowing pressure in the production process of multilayer combined production wells in W oilfield, at the same time, limited by the high cost of offshore operations and the less amount of PLT data, it is difficult to divide the production of small formations, and the degree of recovery and water cut of small formations are not clear. Based on the data of relative permeability cure, production logging and pressure build-up well test, a mathematical model of production splitting in small formations was established. Finally, K′HKr production splitting formula was put forward. On the basis of considering oil-water two-phase seepage, dimensionless recovery index correction was introduced to further improve the accuracy of production splitting and water-cut prediction. The research results were applied to well A2 in W oilfield, and the predicted water cut is only 1.9% different. The development of subdivision strata in oilfields was guided, and the contradiction of vertical development was improved, achieving a cumulative increase of 1.70×104 m3 of oil through the implementation of water control measures.
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