دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: refer todown-the-hole hammer drill

n: a serial of drilling equipments with the shocking devices connected to the bit or the core bit through the core barrel,and the fluid driving the rotating head or the rotary table on the ground to propel the bit

n: refer todown-the-hole hammer drill

n: refer todown-the-hole hammer drill

n: a drilling tool that, when placed in the drill stem just above a roller cone bit, delivers high-frequency percussion blows to the rotating bit. Hammer drilling combines the basic features of rotary and cable-tool drilling (i.e.. bit rotation and percussion).

n: a kind of satellite drilling tool which is installed in bottom of the pipe and the top of cone bit and which can create high frequency impact effect

v: see hammer drill.

n: 1. cable-tool drilling. 2. rotary drilling in which a special tool called a hammer drill is used in combination with a roller cone bit.

n: 1 see cable tool drilling. 2. during the rotating drilling, connected special high frequent hammer assembly with the cone bit, the breaking rock caused by rotated and shocked jointly.

n: see hammer drill.