Tonmiles - Work

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Tonmiles, release 1, issued 18 May 2008. WORK version.

The current release of this worksheet exists in different versions. They are identical apart from the way they are formatted. The Work version hides intermediate calculations and allows the user to see the results just below the inputs. This is useful for quick “what-if” games, changing various inputs to see what works best. The Audit version displays all intermediate calculations. The PDA version removes all text and formats the input and output fields for optimum viewing on a mobile, small-screen device.

User input

 

Round or short trip, factor 1One way trip, factor 0.5Drill, no ream, factor 3Drill, ream once, factor 4Drill, ream twice, factor 5Run casing or tubing, factor 0.5

Select the operation to be calculated.

 

0

 

ftm

Shallowest measured depth (round trip, enter zero). MDupper =

 

4000

 

ftm

Greatest measured depth. MDlower =

 

93

 

ftm

Length of a stand, OR for running casing, length of a joint. Lstand =

 

12

 

psi/ftSG or kg/lppglb/ft3ppbkPa/m

Drilling fluid density. ρm =

 

20.85

 

lb/ftkg/m

Drillpipe weight per unit length (recommend API approx wt, see RP7G Table 8 or 9) OR casing. wtcdp =

 

50

 

lb/ftkg/m

Heavy weight drill pipe average weight per unit length. wtchwdp =

 

465

 

ftm

HWDP length. Zero for running casing. Lhwdp =

 

8

 

inmm

Drillcollar OD. Ddc =

 

2.75

 

inmm

Drillcollar ID. ddc =

 

280

 

ftm

BHA length. Zero for running casing. Lbha =

 

45000

 

lbkg

Travelling block weight. mtb =

  

Click here when any values are modified to update the result.

Results

For the selected operation, the work done by the drilling line is

Worksheet references

SG of steel from http://www.simetric.co.uk/si_metals.htm taken as 7.85.

Drilling Data Handbook, 6th Edition, Institut Francais du Petrole.

Release 1 of this worksheet 18 May 2008.

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