With the development of the oilfield and casings in the bad
environment of high temperature , it is necessary to study
techniques of detecting casing for new well-logging systems. The
new techniques and system can take important effect in
maintaining the oil-water wells successfully , improving down-
hole’s producing conditions and increasing overall economical
benefits of the oilfield. By solving the key techniques of high-
temperature resistance , high-pressure resistance , seal , and long-
distance video signal transmission , we developed the down2hole
optical well-logging system , it can show the situation of the
down-hole clearly. In this paper , the key techniques and
solutions of the system are analyzed in detail. The field test
indicates that the video pictures of the down-hole are vivid. The
system is running for 5 hours with 110 ℃, 25 MPa , general
performances meet requirements of the system’s design.
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