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!
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.
Pipe stretch, release 1, issued 7 March 2010. WORK version.
This worksheet exists in two 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.
This worksheet will calculate the change in length of pipe due to a) it’s own weight when submerged in fluid, b) additional axial load (tension or compression) and c) a change in the average temperature.
psi/ftSG or kg/lppgkPa/mlb/ft3lb/bbl
Mud density. Jmudsg
Steel vertical length. L_Vsteel
Pipe OD and ID. L_Dpipe & L_dpipe
Average temperature change. TΔ
Enter a -ve value if the temperature drops
Additional load. Fα
Enter a -ve value if axial compressive force
Click when modified to update the result.
Original length of pipe
Length of pipe due to
axial and thermal strain