單動(dòng)雙層巖芯管鉆具結(jié)構(gòu)簡(jiǎn)單、操作方便、同軸度好，使用壽命長(zhǎng)，能有效地提高巖、礦芯采取率， 保證巖、礦芯的完整度。

The swivel-tube barrel can effectively increase core recovery fatio. It is suitable for drilling in  formations which have oblique holes. It is effective to assure hole quality.

雙管鉆具：國(guó)際標(biāo)準(zhǔn)：T2-76、T2-86、T2-101、T6-101、T6-131

雙管鉆具：國(guó)內(nèi)標(biāo)準(zhǔn)： P56、P59、P75、P91、PA-110、PA-130、PA-150

Double tube core barrel:International Standard:T2-76、T2-86、T2-101、T6-101、T6-131

Double tube core barrel:National Standard:P56、P59、P75、P91、PA-110、PA-130、PA-150