US 12,071,584 B2
Diverting agent and method of filling fracture in well using same
Yasuhiro Hirano, Tokyo (JP); Takahiro Saka, Tokyo (JP); Ryosuke Taniguchi, Tokyo (JP); and Chizuko Furo, Tokyo (JP)
Assigned to MITSUBISHI CHEMICAL CORPORATION, Tokyo (JP)
Filed by Mitsubishi Chemical Corporation, Tokyo (JP)
Filed on Jun. 21, 2021, as Appl. No. 17/352,693.
Application 17/352,693 is a continuation of application No. PCT/JP2019/051043, filed on Dec. 25, 2019.
Claims priority of application No. 2018-245096 (JP), filed on Dec. 27, 2018.
Prior Publication US 2021/0309910 A1, Oct. 7, 2021
Int. Cl. C09K 8/508 (2006.01)
CPC C09K 8/5083 (2013.01) 6 Claims
OG exemplary drawing
 
1. A diverting agent, comprising:
a polyvinyl alcohol-based resin having an average polymerization degree of 2800 to 4000; wherein
the polyvinyl alcohol-based resin has a degree of saponification in the range of from 60 mol % to 98.5 mol %, and
the polyvinyl alcohol-based resin is a modified polyvinyl alcohol-based resin, the modified polyvinyl alcohol-based resin being a polyvinyl alcohol-based resin having a primary hydroxy group in a side chain or an ethylene-modified polyvinyl alcohol-based resin.