Double-wall drill rod with inner-layer pipe body being double-metal composite pipe

• Main Authors: LI YUANXIN, QU ZHONGLEI, ZHANG XIANCAI, JI SHUYAN, WU XINWEI, SONG LIMING, ZHANG HAIYANG
• Format: Patent
• Language: Chinese; English
• Published: 26.08.2022
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The utility model provides a double-wall drill rod with an inner-layer pipe body being a bimetal composite pipe, one end of the pipe body is welded with a joint A which is an internal thread joint, the other end of the pipe body is welded with a joint B which is an external thread joint, a connecting pipe is installed in the pipe body, the connecting pipe is a bimetal composite pipe, and the inner-layer pipe body is a bimetal composite pipe. The connecting pipe comprises a base body and a lining layer, the lining layer is compounded on the inner wall of the base body, an upper connector is installed at one end of the connecting pipe, the outer wall of the upper connector is connected with the inner wall of the connector A, a lower connector is installed at the other end of the connecting pipe, and the outer wall of the lower connector is connected with the inner wall of the connector B; according to the double-wall drill rod, the double-metal composite pipe is adopted as the inner layer pipe body of the doubl