A stainless steel or MONEL chemical injection capillary tube is attached to the mandrel at surface; the mandrel and injection line are then run to the desired depth with the completion. 由耐腐蚀合金制成,适用于高浓度的H2S or CO2,心轴可用于各种尺寸的油管. 冗余的、经过现场验证的耐腐蚀止回阀提高了可靠性.