DOWNHOLE TOOL EQUIPPED WITH A DOWNHOLE TOOL ELEMENT CONTAINING A CHEMICALLY ACTIVE METAL AND A DOWNHOLE TOOL ELEMENT CONTAINING A DEGRADABLE RESIN COMPOSITION, AND A WELL DRILLING METHOD

摘要

A downhole tool, provided with: a downhole-tool member containing a reactive metal; a downhole-tool member containing a degradable resin composition that promotes degradation of the reactive metal, preferably a degradable resin composition containing a degradable resin that generates an acid by degradation or a degradable resin composition containing a degradable resin and an inorganic substance or organic substance that promotes degradation of the reactive metal; and, as desired, a degradable rubber member. Moreover, a well-drilling method using this downhole tool.