Hydraulic refracturing improves productivity in Chinese oil field

Alternative-orientation hydraulic refracturing successfully stimulated low-permeability reservoirs in the Maling oil field, China.The treatments involved creating a new fracture azimuth by directionally perforating and plugging of existed fractures.Analysis indicted that some reasons for the low oil-production rate prior to the retreatment of the wells included closure of the initial hydraulic fractures, reservoir sensitivity to water, wax and paraffin deposition, and scale buildup.Maling oil field Click here to enlarge imageMaling oil field is a low-permeability sandstone reservoir. The target formation for the refracting is the Jurassic Yan'an group. Table 1 lists the reservoir par...

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