Ingegneria meccanica: Industria petrolifera
| English |
| drill string |
  |
|
| Part of speech |
Noun phrase
|
| Grammatical label |
Countable
|
| Full form |
drillstring assembly
|
| Definition |
The mechanical assembly connecting the rotary drive system on the surface to the drilling bit. On the surface, it hangs from the hook by the swivel and the rotary drive comes from the kelly. It fulfils several functions: (a) transmits the energy required to break up the rock formation by whatever bit may be used; (b) guides and controls the trajectory of the bit; (c) exerts a compressive force on the drilling bit, or weight on the bit; (d) allows drilling fluid to circulate with minimum pressure losses.
|
| Definition source |
Sh91
|
| Context |
The drill string is particularly susceptible to fatigue, wear, poor maintenance and supervision, and inappropriate use. The most common failure occurs at drill collar threads where stresses are the highest.
|
| Context source |
CC88
|
| Synonym |
drill stem, bottom hole assembly
|
| Subject field |
Petroleum Engineering
|
| Comprehensive concept |
bottom hole assembly
|
| Partitive concept |
bit, drill collar, drill pipe, heavyweight drillpipe, sub, reamer, stabilizer, jar
|
| it |
batteria di perforazione
|
| Reliability code |
3
|
|
