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Question 4. In order to make electromagnetic measurements while drilling, EMWD, a non-magnetic isolation sub is required at the position of the signal generation. This is located just above the mud motor and the universal bottom hole orientation sub, UBHO, and is part of the drill string. Select a material to be used for this application. Solution Use and Properties An EMWD deice is a downhole sensor. It is attached behind the drill bit. Its primary purpose is to measure environmental contaminants while drilling. As the EMWD is an electromagnetic device a non-magnetic isolation sub is required over it in order to obtain the most accurate data. This non-magnetic isolation sub will be designed to have a relatively long life (at least 20 - 30 times down hole), with appearance (surface finish) not important as it is to go downhole. This isolation sub will also be considered a performance item in terms...

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