Apply air reverse circulation drilling, appropriate increase length of twofold wall drill tools under certain conditions, may be drilling much deeper.

运用气举反循环钻进，在满足一定条件下适当增加双壁钻具长度即可得到较大钻进孔深。

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To some extent, these companies believed it was easier to "drill" on Wall Street by buying proven reserves than to actually implement a successful drilling program.

FORBES: A Gold Mine In Oil Exploration

Those folks love to drill for oil and gas on Wall Street.

FORBES: McMoRan DeRisks the Ultra Deep As It Nears a Financial Bonanza