Polyglycolic acid resin composition, molded product for well drilling, and downhole tool member
AssigneeKureha Corporation
InventorsTakuma Kobayashi, Hikaru Saijo, Katsumi Yoshida
Life of this patent
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Abstract
In light of increasingly severe and diverse excavation conditions for hydrocarbon resource recovery, such as the drilling of very deep wells, provided is a highly impact-resistant polyglycolic acid resin composition that is resistant to damage even from contact or collision with various members during molding, transport, and well drilling; has excellent mechanical properties and heat resistance; can easily be removed as necessary after the completion of well treatment; and contributes to reducing the cost and shortening the process of well drilling. Also, provided is a molded product for well drilling, such as a downhole tool member.
Claims6
A molded product for well drilling formed from a polyglycolic acid resin composition,
- the polyglycolic acid resin composition comprising:
- a polyglycolic acid;
- and
- an acrylic rubber core-shell polymer having an acrylic rubber as a core layer, and a vinyl (co)polymer as a shell layer,
- wherein a melt viscosity of the polyglycolic acid is from 450 to 1600 Pa·s when measured at a temperature of 270° C. and a shear rate of 122 sec−1,
- an average inter-particle distance of the acrylic rubber core-shell polymer dispersed in the polyglycolic acid is from 0.2 to 2.5 μm,
- an Izod impact strength (unnotched) of the polyglycolic acid resin composition after being left to stand for 4 hours at a temperature of 170° C. is 70% or greater of that of the polyglycolic acid resin composition prior to being left to stand for 4 hours at the temperature of 170° C., the Izod impact strength being measured in accordance with ASTM D256, and
- the molded product for well drilling is a downhole tool member.
Dependencies are inferred from the claim text.