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。

youdao

Now the White House says there will be no additional drilling while the spill in the Gulf of Mexico is investigated.

VOA: special.2010.05.01

The California Democrat wants the federal agencies involved in off-shore drilling to be more effective.

VOA: standard.2010.05.18

But he fears that could all be coming to an end as the massive oil slick from the Deep Water Horizon drilling rig creeps toward the coast.

VOA: standard.2010.05.04

As I write in my book, we need to be drilling everywhere we can.

FORBES: John Mauldin And The Compromise To Save The Republic

However petrobras will be drilling in gulf (but at the ultimate deep water level).

FORBES: Dispelling the Brazil Oil Loan Myth as Obama Heads to Rio

The Scarabeo-9 will be drilling in even deeper waters, and sea currents mean that any spill would threaten the Florida coast.

BBC: The Scarabeo 9 rig