DIVERTING AGENT AND METHOD FOR CLOSING CRACK IN WELL WITH USE OF SAME

摘要

An object of the present invention is to provide a diverting agent which does not completely dissolve in water and seawater in an ultra-low temperature to low temperature range (5°C to 30°C) for a certain period of time (about 5 minutes to 3 hours), and is quickly dissolved and removed after a certain period of time in an excavation method using a hydraulic fracturing method. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin having 2.3 mol% to 15 mol% of a hydrophilic modifying group in a molecular structure thereof.