Suitable for oil wells, gas wells, coal mines or under high temperature conditions. The cables marked with Dry; They are a series of cables in which the typical water blocking the intermediate tubes (gelatin, water swelling tape or powder) is replaced with a solid foamed thermoplastic elastomer. Permanent downhole fiber-optic cables are critical infrastructure in wellbore monitoring systems, ensuring reliable transmission of data for applications such as distributed temperature, acoustic, and strain sensing (DTS, DAS, and DSS)—all with one 1/4-in control line. With over 40 years of experience in manufacturing high reliability optical fibers, we are proud to offer a wide range of specialty. Optical fiber logging cable is a type of cable used in oil and gas well logging applications. Logging cable is used to lower instruments into wellbores to take measurements of the subsurface. Since 1997, through technology introduction, digestion, absorption and re-innovation, Huaneng has achieved a perfect transformation from industry followers to industry leaders, driving the overall technological progress and industrial development of China's industry.