Mitsubishi Chemical Corporation

Kenji Furui

Shusaku Mandai

Chizuko Furo

Ryosuke Taniguchi

Yasuhiro Hirano

Ken Sato

Kenji Shinohara

Yuya Kanamori

Keito Ikebata

Tomoki Onishi

A diverting agent and method for temporarily filling fractures. The diverting agent contains a powder-like polyvinyl alcohol-based resin (P1) and a pellet-like polyvinyl alcohol-based resin (P2), and has an adsorption coefficient kc of 0.01 or more and 1 or less.

Diverting agent, method for temporarily filling fracture in well using same, and method for further forming fracture

A diverting agent of the present invention contains a polyvinyl alcohol-based resin, wherein when the diverting agent is added to a 0.48 mass % aqueous solution of guar gum to prepare a mixed solution having a concentration of 12 mass %, a dispersion liquid obtained by dispersing the mixed solution at 30&#xb0; C. for 60 minutes is pressurized and dehydrated at a pressure of 1 MPa using a pressure dehydration device including a drainage part having a slit having a width of 2 mm, and a regression line represented by an equation (A): y=ax+b (in the equation (A), y is a cumulative dehydration amount (g), x is a square root of a time (minutes) elapsed from start of pressurization, a and b are a slope and an intercept of the regression line, respectively, and 0&#x3c;x&#x2264;2) is calculated by a least squares method from a scatter diagram plotted on a graph in which the square root x of the time is plotted on a horizontal axis and the cumulative dehydration amount y is plotted on a vertical axis, a slope a of the equation (A) satisfies a condition (B): a&#x2264;80.

Diverting agent and method of filling fracture in well using same

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Tokyo, Japan

Kenji Furui