Description
Drilling auxiliary apparatus is used, in assistance with the drilling rig, to accomplish the drilling. Generally speaking, there are surface tools and drilling tools.
Surface tools, as its name indicates, locates above the ground. They are mainly:
1. Mud pump: deliver the washing liquor to the drilling hole.
2. Drilling tower: lift up or down the drilling rig or hang the drilling tools.
3. Mud mixer: prepare the washing liquor by mechanical mixing.
4. Water swivel: a rubber tube with high pressure to transmit the washing liquor and connect the rotary drilling tools.
5. Clamp: grasp the drilling tool and casing to the drilling hole.
Drilling tools refer to the drill rod, drill bit, casing and sub, etc.
1. Drilling rod: a metal tube to transmit the broken rock or the washing liquor. It can be divided into wire-line, right-hand threaded, left-hand threaded, external and internal threaded drill rod and drive pipe as well as Kelly, etc.
2. Drill bit: a specialized tool to break the rock. There are various drill bits: core bit, non-core bit, hard-metal bit, diamond bit, vertical tipped bit and self-sharpening bit, etc.
3. Casing: a tube in the drill hole to protect the wall of the hole and to separate and seal the oil, gas or the water layer.
4. Sub: used to connect the internal threaded drill rod together.
