This paper presents a case study where the creative use of wireline-derived sand strength in the offshore production test process improved operational efficiency. Sand strength was computed using wireline data only and subsequent testing of two wells verified the accuracy of the calculations. Well logs provided the basis for evaluation of formation petrophysical and mechanical properties. These log-based properties enabled a foot-by-foot profile of the critical drawdown pressure to be generated. Analysis of critical drawdown pressures in the Bohai Wells A and B, located in the northeastern People's Republic of China, provided a costeffective method to predict potential sand production problems. This information proved invaluable in reducing the risk and costs associated with the testing of viscous oils in the shallow, moderately unconsolidated sandstones of Bohai Bay.

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