Abstract
Due to the development of the biogenic limestone Cracks of reserves and dual-media, the pore permeability is larger different, the sensitivity is strong, and the risk of lost circulation is large, which leads to the serious formation pollution caused by the lost circulation. According to the reservoir characteristics, the temporary blocking system has been developed, Its temporary blocking component size expanded to 5μm∼2.0mm, Block size expanded from 0.2mm to 1.0mm, the limestone temporary blocking rate’s minimum is 90%, invasion depth of sand bed is less than 3 cm, temporary blocking component degradation rate is higher or equal to 90%. Excellent technical application, the average recovery period of the pump well was reduced from 7 days to 3.7 days, and the recovery rate was increased from 70% to 97%.
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