Oil casing PRODUCT Huike Steel pipe Co., Ltd. Tubing and casing pipeTubing is used to extracting petroleum and natural gasfrom a well. Tubing and casing pipeTubing is used to extracting petroleum and natural gasfrom a well. Tubing and casing pipeTubing is used to extracting petroleum and natural gasfrom a well. Tubing and casing pipeTubing is used to extracting petroleum and natural gasfrom a well.