DOWNHOLE TOOL COMPRISING DOWNHOLE TOOL MEMBER CONTAINING REACTIVE METAL AND DOWNHOLE TOOL MEMBER CONTAINING DECOMPOSABLE RESIN COMPOSITION, AND WINZE DRILLING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a high-strength downhole tool with decomposability under certain environment which helps reducing winze drilling costs and curtailing process time, by surely winze processing and easily removing thereof under diverse winze drilling environmental conditions in which development drilling conditions are severe and diverse.SOLUTION: A downhole tool comprises: a downhole tool member containing a reactive metal; a downhole tool member containing a decomposable resin composition that promotes decomposition of the reactive metal, preferably a decomposable resin composition containing a decomposable resin that generates an acid when decomposed, or a decomposable resin composition containing an inorganic substance or an organic substance that promotes decomposition of the decomposable resin and the reactive metal; and optionally, a decomposable rubber member. A winze drilling method using the downhole tool is provided.SELECTED DRAWING: Figure 1