May 2012
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8 Reads
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2 Citations
The Chang-6 reservoir in Qilicun oilfield is a shallow reservoir with ultra-low permeability, low pressure and low yield. Conventional hydraulic fracturing can fracture 1 layer or 2 layers. The laminar reservoirs which contain several calcareous interbeds have low development degree because of bad vertical connectivity or no vertical connectivity. So the reservoirs have low yield and recovery factor. The multi-horizontal fracture fracturing of the laminar reservoir is effective way for enhancing their yield and recovery factor. The main factors of influencing the hydraulic jet fracturing effect of cluster wells in shallow reservoir are studied based on the hydraulic jet fracturing mechanism, and the technological measures for multi-horizontal fracture fracturing in shallow laminar reservoirs are proposed. The pilot test results show that, the hydraulic perforation-fracturing united technique can accurately determine the cracking location of horizontal fracture, which solves the uncertainty of the cracking location of horizontal fracture in the construction of wax-ball temporary plugging small-spacing multi-horizontal fracture fracturing technology. The pilot tests achieved good results.