Drilling Calculations钻井计算,国外,英语

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DataMetricUnitField
DP1 real weight /including tool joint/25.05kg/m19.5
DP2 real weight /including tool joint/
31.83kg/m0
HWDP real weight73.4kg/m49.32
DC1 real weight
149.8kg/m92
DC2 real weight
123.9kg/m0
Weight of travelling block, hook etc.48tons85000
DP1 length
1000m9535
DP2 length
1500m0
HWDP length300m857.48
DC1 length
150m108
DC2 length
100m0
Mud density1.4kg/l9.7
Depth of stuck point3384m10350
Depth of back-off2500m10300
Tool joint matting surface area21.93cm23.4
DP1 torsional strength141.2103daN317430
Max torsional limit for 1000 m DP12 1/2turns/1000 m10

Procedures
1. Before any back-off, determine the depth of stuck point. Decide the depth of back-off.
2. Make up the drill string to 80% of the torsional limit of the drill pipe in tension ( weight
of drill string in mud ). Read the torsional limit in the "Drilling Data Handbook" K21-K24
chart, and multiply by the back-off depth/1000 m ( back-off depth/3280,84 ft ). Make-up
the drill string to the right.
3. Set the neutral point at the depth of back-off. The weight indicator should show the cal-
culated tension.
4. Apply leftward twist amounting to 80% of the rightward twist used to make-up the string

Calculation of weight of drill string in mud
107tons202895
80% of max. torsional limit at back-off depth in tension
25right turns25
Hydrostatic pressure at the depth of back-off34335kPa5195
Weight in mud of free length of drill pipe + block108tons243402
Weight indicator tension at neutral point115tons261070.683
80% of rightward turns for applying leftward twist 20left turns20

Back-off
Fill in ONLY the section above with data and the program will calculate by itself !!!
D
C
2
D
C
1

H
W
D
P
D
P
1
D
P
2

Bit
Unit
lb/ft
lb/ft
lb/ft
lb/ft
lb/ft
lbs
ft
ft
ft
ft
ft
ppg
ft
ft
in
2
lbs
turns/3281 ft

off.
ight
1-K24
-up

e cal-
string.

lbs
right turns
psi
lbs
lbs
left turns

am will calculate by itself !!!