In order to ensure the requirement of high anti-sulfur in Luojiazhai and Tieshan sour gas well, some casing heads and gas-producing wellheads have been imported since 2003.
为保证川东北地区罗家寨、铁山坡构造高含硫气井长期采气高抗硫要求，2003年起，从国外进口了部份套管头和采气井口。
In order to ensure the requirement of high anti-sulfur in Luojiazhai and Tieshan sour gas well, some casing heads and gas-producing wellheads have been imported since 2003.
为保证川东北地区罗家寨、铁山坡构造高含硫气井长期采气高抗硫要求，2003年起，从国外进口了部份套管头和采气井口。
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