abandoned well
adjoining well
appraisal well , / - ,
barren (dry \ non- productive) well ( )
beam well ,
belching well / ,
borderline well
borehole / bore well
brought in well ,
cable tool well ,
cased through well
cased well
commercial well c,
completed well c, /
confirmation well , ( )
controlled directional well -
dead well ()
development well ()
discovery well , /
drowned well
dually completed well
edge well ()
exhausted well ( )
exploration well
infill well ,
injection (input) well
intake well ( )
junked well , ; ,
key well ; ( / )
line wells ,
marginal well - ( )
natural well , , ,
offset well , ,
offshore well
off-structure well ,
on-structure well ,
paying well ( )
pinch out well , /
production well
prolific well
prospect well
recovery well / ( , , )
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relief well , ( ); ;
sand (ed) well , ; ,
service well
step-out well ( );
stripper well , 1.53/
test well
twin well , , ; ,
well in operation
well off
well out of control ,
well under control
wellhole
wild well
wildcat - ( )
EXERCISE 7 Read and translate the text", using the words after the text.
STRAIGHT HOLE DRILLING
Frequently it is necessary to drill a straighter hole than was originally planned when the job was started with a certain string of drill collars. Also, it may happen that it is desired to put more weight on the bit without increasing the deviation. The best single proven way to do either of these things with the same string of drill collars is to add stabilizers. For deviation control a single stabilizer is sufficient if it is properly located in the drill string. The proper location is the first bend in the drill string above the bit. Since the bending point depends on the hole size, drill size and weight on the bit, it may occur at different points. To some extent the placement is also dependable on the formation characteristics.
It has been considered good practice in some cases to space additional stabilizers about one stand apart through a portion or all of the rest of the drill collar string. The additional stabilizers do not help to keep the hole straight. They do help in preventing wall sticking and other problems associated with hole conditions.
With the use of stabilizers, it is important to remember that stabilizers are usually the weakest point in the drill string and, therefore, subject not only to wear but failure. Some of the more modern stabilizers have been designed so that the wings do not create a serious hazard in the hole. For example, some of these are made of drillable material and some may be removed with washover pipe.
By reducing the weight on the bit, the bending characteristics of the drill string are changed and the hole will tend to be straighter. One of the oldest techniques for straightening a hole was to reduce the weight on the bit and speed up the rotary table. In recent years it has been found that this is not always the best procedure because reducing the bit weight sacrifices considerable penetration rate.
The straightening of a hole by reducing bit weight should be done very gradually so that the hole will tend to return to vertical without sharp bends and will therefore be much more safer for future drilling.
The words to be memorized:
1. Bending point
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2. Penetration rate
3. Space ,
4. Washover pipe
5. Stabilizer
6. Sticking
7. Collar
8. Drilling equipment
9. Rotary table
10. Bottom-holeassembly()
11. Logging
12. Blowout preventer ()
13. Pay zone
14. Wild well ;
15. Kill line ;
16. Flare pit ;
17. Dummytrip -
