COMPOSITION, COMPOSITION FOR DOWNHOLE TOOL, DEGRADABLE RUBBER MEMBER FOR DOWNHOLE TOOL, DOWNHOLE TOOL, AND WELL DRILLING METHOD

摘要

A composition for downhill tool, a degradable rubber member for a downhole tool, a downhole tool, and a method for well drilling are provided which contribute to cost reduction and process shortening and can contribute to improvement of production efficiency. A degradable rubber and a degradation accelerator comprising at least one type of compounds represented by a general formula (I) below at the ratio from 0.1 to 20 parts by mass to 100 parts by mass of the degradable rubber, containing the composition for a down hole tool, i.e. degradable rubber member for a down hole tool, and a method for well drilling using them.(In Formula (I), R¹ and R² are each individually alkyl groups having from 1 to 5 carbons or phenyl groups)