Vertical Hole Openers areused to enlarge the pilot hole in Horizontal Directional Drilling(HDD) - HDD isused when trenching and excavating is not practical. This drilling technologyallows for a steerable trenchless way to drill underground. There are threestages, the first stage is to drill a small diameter pilot hole. The secondstage is enlarge the hole with a larger diameter cutting tool called a Reamer ora Hole Opener. The third stage is inserting the casing pipe or other productinto the enlarged hole.
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Hole Openers are used toenlarge the diameter of a pre-drilled hole. They are custom built tospecification, and come in a wide variety of sizes. A Hole Opener is sometimesreferred to as a Reamer.
Hole Size | PilotHole | StandardFishing Nick O.D | ThreadType |
Upper | Lower |
7-5/8 | 5-5/8 | 5-1/2~6 | 4-1/2 REG | 3-1/2 REG |
8-1/2 | 5-5/8 | 5-1/2~6 | 4-1/2 REG | 3-1/2 REG |
10-5/8 | 7-5/8 | 8 | 6-5/8 REG | 4-1/2 REG |
12-1/4 | 8-1/2 | 8 | 6-5/8 REG | 4-1/2 REG |
14-3/4 | 10-5/8 | 8~9-1/2 | 6-5/8 REG | 6-5/8 REG |
17 | 10-5/8 | 8~9-1/2 | 6-5/8 REG | 6-5/8 REG |
17-1/2 | 10-5/8 | 8~9-1/2 | 6-5/8 REG | 6-5/8 REG |
20 | 15 | 8~9-1/2 | 6-5/8 or 7-5/8REG | 7-5/8 REG |
24 | 15 | 8~9-1/2 | 6-5/8 or 7-5/8REG | 7-5/8 REG |
26 | 15 | 8~9-1/2 | 6-5/8 or 7-5/8REG | 7-5/8 REG |
36 | 26 | 9-1/2~10-1/2 | 7-5/8 or 8-5/8REG | 8-5/8 REG |
42 | 26 | 9-1/2~10-1/2 | 7-5/8 or 8-5/8REG | 8-5/8 REG |