Casing 168 146 127 with eccentric reaming pipe casing eccentric reaming DTH drilling to follow up on the sleeve and techniques of an eccentric reaming DTH drilling casing follow up system to use: 1, eccentric reaming DTH drilling casing follow up follow up system can be divided into the sleeve rotary casing and casing are two types of non-rotating, rotating sleeve type casing follow-up to the turret drive sleeve rotation, while applying axle rig Promoting casing pressure to follow up; non-rotating sleeve type bushings follow up is the impact of the inner casing through the casing shoe shoulder, while applying pressure propulsion shaft sleeve follow-up drilling rig. 2, before drilling, spot welding methods must be two elastic cylindrical shank end face of the pin hole welding live, to prevent loose pin, guiding drill bits and drill bits fall into the bottom of the hole reaming. When replacing the guide drill bits, must first be dross solder tail end face of the pin hole to remove, then remove the spring pin, long pin, ball, can be replaced. 3, eccentric reaming drill is coupled with good impact, impact drill pipe connection with the good, turret drive rotary drill pipe, with a positive way to make eccentric reaming rotary drill head protruding hole drilled in the center hole and reaming around the casing while the follow-up after reaching the desired depth, the drill pipe and drill bit eccentric reaming anti-rotation, so reaming drill head incorporated into the center position, out from the casing. If the bottom of the hole is the consolidation layer, or hard rock drilling needs to continue, you must replace conventional DTH other appropriate diameter drill bits, drilling back into the hole to continue the consolidation layer, or hard rock. 4, after the consolidation layer, or hard rock drilling is completed, within the drill hole impactor raised by hydraulic puller raised the sleeve from the hole. Second, the eccentric reaming DTH drilling casing follow up system is suitable geological conditions: rock layer, cover layer drilling, in order to ensure stability after the drill hole wall, follow up with the casing perforations engineering, structural design is reasonable, high strength, and life is quite similar foreign products, especially for fault rock layers. Features: 1, while not normally into the hole, using a jacket tube into the hole to finish the job Wall 2, 3 reaming and contraction is very flexible, high-pressure and low-pressure impactor type series matching with your three sets of common specifications tube diameter (mm) Φ108, Φ127, Φ146, Φ168, Φ183, Φ219, Φ245, Φ273 with pipe, casing, casing reaming