Tonmiles – Audit
NOTICE: Our Mathcad database got attacked and infected with a virus. Unfortunately, we've had to shut it down until further notice.
You can safely browse the pages, as the Mathcad server was separate to this main website, and was only accessible here. (We used something called an iFrame, which is like a window into a different website).
UPDATE 28th of January 2020: the virus happened just over a week ago. We've temporarily cut and pasted the text parts of the Mathcad pages rather than having blank pages there.
UPDATE 3rd of February 2020: We've been unable to recover the Mathcad worksheets and offer them in a format that provided total security to users. They were published a decade ago, and our IT people say that they would need a complete re-creation with the latest code and security fixes.
APPEAL: These 44 pages were created, and offered as a free resource for over a decade. We know from our website analytics that more than 1000 users visited each month. If only half of these regular visitors donated $20, we would have enough to create an even better solution. As you know, time is money, have these Mathcad pages saved you $20 in time over the years? We expect that they have, not to mention the learning opportunities provided to new engineers entering the industry.
Please, donate at least $20 as a one-off payment, to bring back the drillers Mathcad back as an always free to use resource!
YES! I've gotten value from the drillers Mathcad in the past, and a $20 is a very affordable way of saying thanks. I also want to preserve this tool for future engineers.
NO! I can't or won't donate to the restoration fund. I'm happy to spend a few minutes to offer a testimonial to help encourage the effort. These worksheets do have value. Offer Feedback.
Tonmiles, release 1, issued 18 May 2008. AUDIT 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.
Calculations
Weight of the BHA
Buoyancy factor from the mud gradient.
Buoyant weight of the BHA including HWDP in excess of the weight of the same length of drillpipe.
Calculate the work at the upper and lower depths in Joules. Note; g is the acceleration due to gravity, 9.81 m/s2.
Subtract the upper from the lower, then multiply by the operation factor to arrive at the total work done.
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.
