Hi GDOL,

for some reason I can not reply to you but had to start a new thread insteed. Below is some info about Directional Drilling.
Hope you find it useful.

Deviated Drilling - Peter G Mills

[link Point to another website Only the registered members can access] Or via google books -

[link Point to another website Only the registered members can access]

Directional Drilling - Tom Ingles

[link Point to another website Only the registered members can access] Or via google books -

[link Point to another website Only the registered members can access]
Horizontal Well Technology - Joshi, S. D.

[link Point to another website Only the registered members can access] Or via google books -

[link Point to another website Only the registered members can access]