- Work – Just shows the inputs and outputs.
- Audit – Shows all intermediate calculations.
- Tutorial – Just In Time Learning. An Audit plus tutorial text.
API Casing Strengths.
API Collapse Resistance.
API Tension and Burst.
Basic Tubular Buckling.
Bending Stress in Tubulars.
Blockline and crown loads.
Hershel Bulkley Rheology.
Non API Casing Strengths. .
Power Law rheology.
SCSSSV API test.
Stuck Point Depth.
Surface Stack Kick Sheet.
Temperature Correction Factor .
Trip and Riser Margin.
Wireline on Drum.
Mathcad worksheet guidance notes:
Most of the worksheets listed have two views available. These views are only different in what they display; it’s the same worksheet in each case. In the WORK version, your inputs and the calculated outputs are shown with all the intermediate calculations hidden. In the AUDIT version, all intermediate steps are shown so that you can audit the calculations for yourself to be assured that they are correct. Whichever version you use, enter the data in the fields, choose the unit you want to use from the drop down list next to the data field. When all the inputs are correct, click on the Recalculate button. This sends your inputs to our web server; the calculation is run and the web page is refreshed on your computer with the results. Note that results are given in both SI and Oilfield units.
Some AUDIT sheets have tutorial text and diagrams added; these are the TUTORIAL versions. You can work through the tutorial, with your own inputs if you want, to learn how the calculations work. Note also that the Worksheet references at the bottom give information on the sources of information and formulae for the worksheet and there are version notes also.
Mathcad is brilliant software for serious calculations, far superior to Excel or your local calculator. Drillers.com can deploy Mathcad worksheets online so anyone with a web browser can use Mathcad to carry out standard oilfield calculations.
One of the advantages of Mathcad is that it understands units. If you enter a value and designate that it is in Metres, Mathcad will generate an error if you try to subtract Gallons from it. If Mathcad is used to divide a distance by a time, it will resolve the units to show the result by default in Metres per Second; however you can make Mathcad display in any valid unit system such as Miles per Hour. You can also designate non-standard units, by designating 1 barrel = 42 US gallons.
Drillers.com is, as far as we know, unique in being the only oilfield website to deploy Mathcad worksheets online. If you would like to suggest any additional worksheets that you would find useful, or in the unlikely event that you find an error in a worksheet, please send your suggestions here.