Ka tlase ho lesoba dth sd mission 6" hamore le theko e nyane
Mefuta e loketseng ea boholo ba lesoba bakeng sa ho phunya masoba ka DTH ke 90 mm ho isa ho 254 mm (3 ½”–10″).Likoti tse nyane tse phatlohileng hangata li chekoa ho sebelisoa tophammer, 'me masoba a maholo hangata a sebelisa mechini ea rotary.Lits'ebetsong tse ling, joalo ka ho cheka motheo, lihamore tsa DTH li ka sebelisoa ka karolo e le 'ngoe ka boholo ba lesoba ho fihla ho .750 limilimithara (30 ″).Ka likarolo tse ngata tsa hamore CD (Cluster drills) e phunya masoba ho fihla ho 70 ″ kapa 1778 mm.
E le molao oa monoana, bophara ba lesoba le lenyenyane ka ho fetisisa leo hamore ea DTH e ka e phunyang ke boholo ba eona ba lebitso.Hamore ea 4 inch e tla phunya lesoba la 4 inch (102 mm).Ntho e fokotsang ke bophara ba ka ntle ba hamore, hobane, ha bophara ba lesoba bo fokotseha, ho phalla ha moea ho thibetsoe.Boholo ba lesoba bakeng sa ho cheka tlhahiso ke boholo ba hamore le 1 inch, kahoo bakeng sa hamore ea 4 inch boholo ba lesoba ke 5 inch (127-130 mm).
Ho khetha hamore e nepahetseng ho khethoa haholo ke boholo ba lesoba le mofuta oa sebopeho sa majoe.Ha e le hantle, boholo ba hamore bo lokela ho lumellana le boholo bo hlokahalang ba lesoba ka hohle kamoo ho ka khonehang, ho siea sebaka se lekaneng sa li-cuttings ho ntša lesoba.
| Mohlala | Khokahano ea Khoele | OD(mm) | Rec.Hole Size | Mokhoa oa Shank | Khatello ea Mosebetsi(Bar) |
| CD35 | API 2 3/8" Reg | φ82mm | φ90-φ105 | DHD3.5 CD35 | 1.0-1.5Mpa |
| CD45 | API 2 3/8" Reg | φ99mm | φ110-φ135 | Cop44 DHD340 CD45 | 1.0-2.5Mpa |
| CSD4 | API 2 3/8" Reg | φ99mm | φ110-φ135 | SD4 CSD4 | 1.0-2.5Mpa |
| CQL40 | API 2 3/8" Reg | φ99mm | φ110-φ135 | QL40 CQL40 | 1.0-2.5Mpa |
| CD55 | API 2 3/8" Reg API 3 1/2" Reg | φ125mm | φ135-φ155 | Cop54 DHD350R CD55 | 1.0-2.5Mpa |
| CSD5 | API 3 1/2" Reg | φ125mm | φ135-φ155 | SD5 CSD5 | 1.0-2.5Mpa |
| CQL50 | API 3 1/2" Reg | φ125mm | φ135-φ155 | Cop54 QL50 CQL50 | 1.0-2.5Mpa |
| CD65 | API 3 1/2" Reg | φ148mm | φ155-φ190 | Cop64 DHD360 CD65 | 1.0-2.5Mpa |
| CSD6 | API 3 1/2" Reg | φ148mm | φ155-φ190 | SD6 CSD6 | 1.0-2.5Mpa |
| CQL60 | API 3 1/2" Reg | φ148mm | φ155-φ190 | Cop64 QL60 CQL60 | 1.0-2.5Mpa |
| CD85 | API 4 1/2" Reg | φ185 limilimithara | φ195-φ254 | Cop84 DHD380 CD85 | 1.0-2.5Mpa |
| CSD85 | API 4 1/2" Reg | φ185 limilimithara | φ195-φ254 | SD8 CSD8 | 1.0-2.5Mpa |
| CQL80 | API 4 1/2" Reg | φ185 limilimithara | φ195-φ254 | QL80 CQL80 | 1.0-2.5Mpa |
| CSD10 | API 4 1/2" Reg API 5 1/2" Reg API 6 5/8" Reg | φ225 limilimithara | φ254-φ311 | SD10 CSD10 | 1.0-2.5Mpa |
| CN100 | API 6 5/8" Reg | φ225 limilimithara | φ254-φ311 | NUMA100 CN100 | 1.0-2.5Mpa |
| CSD12 | API 6 5/8" Reg | φ275 limilimithara | φ305-φ445 | SD12 CSD12 | 1.0-2.5Mpa |
