The core applications of tantalum capillary tubes in the chemical and petroleum industries are their extremely strong corrosion resistance, high temperature and pressure resistance, and dimensional precision. They are primarily used in harsh conditions where ordinary stainless steel, titanium, and Hastelloy cannot withstand the stress. Their main applications include: transporting highly corrosive media (the primary use), specifically for conveying various strong acids and corrosive fluids: concentrated sulfuric acid, concentrated hydrochloric acid, nitric acid, aqua regia, and organic acids; transporting halogen media: chlorine, bromine, iodine, and halide solutions; and transporting chlorine-, fluorine-, and sulfur-containing process fluids. They are used as micro-sampling tubes, metering tubes, process bypass tubes, and instrument pressure taps, exhibiting no corrosion, leakage, or deformation over long-term use. In petroleum exploration and downhole operations, they are used as sensor protective casings in deep and ultra-deep wells under high temperature and pressure environments, including those containing hydrogen sulfide (H₂S), carbon dioxide, high salt, and high acid oil and gas wells; and as pressure taps for downhole pressure and temperature transmitters, offering corrosion resistance, anti-clogging properties, and stable signal transmission. Applications include: Micro- and high-precision fluid transport in chemical reactions and fine chemicals, pharmaceuticals, and new material synthesis; thermocouple protection tubes for temperature measurement within reactors; capillary tubes for catalyst loading; gas distribution tubes; and temperature- and pressure-resistant microchannel reactor capillaries for continuous reactions in highly corrosive systems. Heat exchangers, condensers, and heat exchangers are used in highly corrosive media heat exchange scenarios, creating small-diameter heat exchange tubes and coils with corrosion resistance and good thermal conductivity, suitable for small-scale precision cooling and heating circuits. Instrumentation, analysis, and safety systems: sample transfer capillaries for online analyzers such as pH meters, conductivity meters, and chromatographs; pressure-sensing capillaries for pressure/level transmitters, ensuring corrosion resistance and preventing sample contamination. Flow-limiting capillaries and throttling tubes in safety valves and flow-limiting devices. Fluid control in special operating conditions. Transport of liquid metals, supercritical fluids, and high-purity chemicals. Process sampling and reflux capillaries in industries such as chlor-alkali, pickling, and electroplating, preventing scaling and clogging, and ensuring long-term stable operation.
Downhole Instruments: Protective capillary sleeves for temperature, pressure, water cut, and corrosion monitoring sensors on logging probes. Internal wiring and media isolation capillary tubes for logging while drilling (LWD) and cable logging probes to prevent highly corrosive formation media from entering the probe core, extending instrument lifespan. Pressure transmitters/downhole static pressure tapping capillary tubes (largest usage), permanent downhole pressure gauges, electronic static pressure monitoring pressure transmission capillary tubes. Wellhead-downhole bridging pressure tapping and packer differential pressure monitoring capillary lines.
Advantages: corrosion-resistant, no perforation, no scaling or pore blockage on the inner wall, long-term pressure maintenance, no data drift. Oil and gas well corrosion prevention sampling/micro-dosage injection tubing, downhole online formation fluid micro-sampling capillary tubes (ensuring authentic sampling, no sample contamination), precise downhole micro-dosage injection capillary lines for corrosion inhibitors, scale inhibitors, and bactericides, dedicated tubing for high-acid gas wells, condensate gas wells, and sulfur-containing heavy oil wells. Downhole safety valves, precision components for throttling and flow limiting, and capillary flow limiting tubes for downhole safety control systems. Hydraulic control oil/gas circuits with micro-diameter piping, resistant to media corrosion and ensuring stable opening and closing. Geothermal wells, especially high-salt brine wells, requiring special conditions; downhole sensing and pressure measurement capillary casing for high-temperature, high-salt, and highly acidic geothermal wells.
