Abstract
In the Azerbadizhanian Scientific-Research Institute for Petroleum Machinery Building investigations have been made of the chemical resistance of nonmetallic materials (IRP-1293 and UPR-362A rubbers, LZ-162 and Armatol-238 sealing greases, ANG gaskets) used in standard production Christmas trees. The investigations were made in chemical reagents pumped into the stratum to accelerate the output of petroleum.
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