Cov ntsiab lus daws teeb meem
Qhov kev ua tau zoo ntawm qhov qhib-qhov DTH drilling rig yog qis dua li ntawm qhov saum toj kawg nkaus rauj drilling rig, tab sis kev ua tau zoo ntawm DTH drilling rig yog qhov zoo tshaj plaws raws li qhov yuav tsum tau muaj ntawm cov kab loj loj thiab qhov tob ntawm ntau dua 30 meters. Yog tias koj tab tom nrhiav cov txiaj ntsig kev lag luam, kuv xav kom xaiv lub sparated drilling rig. Yog tias koj tab tom nrhiav kev ua haujlwm zoo thiab kev nyab xeeb ntawm kev ua haujlwm, kuv xav kom yuav ib qho kev sib xyaw drilling rig. Peb yuav kho qhov zoo tshaj plaws pob zeb drilling txoj kev npaj rau koj raws li koj xav tau.
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