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US 11,597,870 B2Granted
Diverting agent and method of filling fracture in well using the same
AssigneeMitsubishi Chemical Corporation
InventorsKazutoshi Tsuji, Norihito Sakai, Tomoya Fujita, Takahiro Saka, Chizuko Furo
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Abstract
A problem to be solved of the present invention is to provide a diverting agent which gradually dissolves in water. The present invention relates to a diverting agent containing a polyvinyl alcohol-based resin and a method of filling a fracture using the diverting agent.
Claims8
A diverting agent comprising:
- a polyvinyl alcohol-based resin, wherein the polyvinyl alcohol-based resin has a degree of saponification of 90 mol % or more,
- wherein when 1 g of the polyvinyl alcohol-based resin is immersed in 100 g of water at 40° C., a ratio of a dissolution rate after 24 hours with respect to a dissolution rate after 1 hour of the polyvinyl alcohol-based resin is 2.8 or more,
- wherein the polyvinyl alcohol-based resin is a modified polyvinyl alcohol-based resin, and
- wherein a modification rate of the modified polyvinyl alcohol-based resin is 0.5 mol % to 10 mol %.
1 more element
Dependencies are inferred from the claim text.