A method of sealing electrical cells which are used in a wellbore

摘要

A method of for providing a glass seal (66) for a cell for providing electrical power to a cylindrical member in a wellbore consists of providing a lid (64) for the cell, forming a hole in the lid, disposing a post (75) surrounded by an annular layer of glass (66) within the hole and heating the lid (64) until the glass (66) seals to the lid (64).