&rpar Description
A drill collar is a device utilised in the drilling of oil wells for weighting the drill bit&comma enabling it to drill by way of rock&interval It is a bar made of reliable steel&comma either basic carbon metal or a non-magnetic metal alloy&comma drilled lengthwise to permit the passage of drilling fluids&interval A drill collar varieties the most affordable aspect of a drill string&comma which encompasses all the elements of a down-hole approach from the area to the rock little bit&time period
6&rpar Structure
These devices are usually 31 feet &lparabout 9&period45 m&rpar long and threaded at both finishes&comma male at one particular conclude and woman at the other&comma to allow a number of drill collars to be joined previously mentioned the little bit assembly&time period
The quantity of drill collars connected to a drill string will depend on the materials composition of the strata at the drill site and the most likely depth of the properly&period of time A relatively shallow well with considerably less dense geologic composition through which the bit need to move will demand much less drill collars than a deep shaft by means of dense material&time period
Typically&comma drill collars will be constant in size but may differ in diameter&comma and their exterior configuration might be slick or spiral&time period The outside the house diameter may possibly fluctuate from about three-1&sol2 inches &lpar8&period89 cm&rpar to eleven inches &lpar27&period9 cm&rpar and increased&interval The reference to slick or spiral outer configuration refers to the machining of the outside surface area of the collar&interval
7&rpar Parameter
Type | OD&lparmm&rpar | ID&lparmm&rpar | L&lparm&rpar ±152&period4mm d |
DF&lparmm&rpar ±0&period4 |
NC23-31 | 79&period4 | 31&period8 | 9&period14 | seventy six&period2 |
NC26-35 | 88&period9 | 38&period1 | 9&period14 | eighty two&period9 |
NC31-forty one | 104&period8 | 50&period8 | nine&period14or9&period45 | 100&period4 |
NC35-47 | a hundred and twenty&period6 | fifty&period8 | nine&period14or9&period45 | 114&period7 |
NC38-fifty | 127 | 57&period2 | nine&period14or9&period45 | 121 |
NC44-sixty | 152&period4 | 57&period2 | nine&period14or9&period45 | one hundred forty four&period5 |
NC44-sixty | 152&period4 | seventy one&period4 | 9&period14or9&period45 | one hundred forty four&period5 |
NC46-sixty two | 158&period8 | fifty seven&period2 | nine&period14or9&period45 | 149&period2 |
NC46-sixty two | 158&period8 | 71&period4 | nine&period14or9&period45 | 150 |
NC46-65 | 165&period1 | 57&period2 | nine&period14or9&period45 | 154&period8 |
NC46-sixty five | 165&period1 | 71&period4 | nine&period14or9&period45 | 154&period8 |
NC46-sixty seven | 171&period4 | 57&period2 | nine&period14or9&period45 | 159&period5 |
NC50-70 | 177&period8 | fifty seven&period2 | 9&period14or9&period45 | 164&period7 |
NC50-70 | 177&period8 | 71&period4 | nine&period14or9&period45 | 164&period7 |
NC50-72 | 184&period2 | seventy one&period4 | nine&period14or9&period45 | 169&period5 |
NC56-77 | 196&period8 | seventy one&period4 | nine&period14or9&period45 | 185&period3 |
NC56-80 | 203&period2 | seventy one&period4 | nine&period14or9&period45 | 190&period1 |
six-five&sol8REG | 209&period6 | seventy one&period4 | 9&period14or9&period45 | 195&period6 |
NC61-90 | 228&period6 | 71&period4 | nine&period14or9&period45 | 212&period7 |
7-5&sol8REG | 241&period3 | seventy six&period2 | 9&period14or9&period45 | 223&period8 |
NC70-ninety seven | 247&period6 | 76&period2 | nine&period14or9&period45 | 232&period6 |
NC70-one hundred | 254 | seventy six&period2 | 9&period14or9&period45 | 237&period3 |
8-5&sol8REG | 279&period4 | 76&period2 | nine&period14or9&period45 | 266&period7 |
NC50-67 | 171&period5 | 71&period4 | 9&period14or9&period45 | 159&period5 |