Oilfield Info & Engineering Calculations
for Completions & Well Interventions
Information & document downloads. Calculator apps specifically for CWI engineers.
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35 Years CWI Experience
35 years CWI Experience. Operational & design experience on offshore & land wells for Completions, Wireline, CT, WellTest, HWU & Well Maintenance projects.
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Information & Calculators
Information & document downloads.
Individual Windows based oilfield calculation Apps available for download, designed with CWI engineers in mind.
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CWI Tallybook
Collection of 36+ individual calculators in one application. No need to search for multiple files in different locations. Easy to identify links on main page.
Windows Based Calculator Apps
(Only available in API units at present time)
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01
Calculations & Conversions
Unit convertor for commonly used oilield units. General purpose calculators including Well Volumes, Pressure Test Volumes, Tank Volumes, Bouyancy Factor, Gas Conversions & CO2 Emissions.
04
Completions
Calculators including Pipe Stretch, Pipe Displacement, H2S & CO2 Partial Pressure, (also used during wireline ops), Length Change Due to Temperature, Buoyed Weight & SSSV Setting Depth.
02
Wireline
Shear Pin Ratings, TVD & MD Between Survey Points, .Gas Lift Tooling & Troubleshooting, Blind Box Sizing, Wire Fallback & wire stretch calculators for estimations during operations.
05
Snubbing & Coiled Tubing
Balance Point calculator, Stuck Point, Annular Velocity & Reduced Collapse Pressure due to tension calculators available at this time..
03
WellTest
Calculators such as, Retention Time, Oil & Gas Choke Rate Estimation, Flow Meter Information, Equivalent Choke Size & Oil Shrinkage calculation.
06
Well Control
Bottom Hole Pressure Due to Density, Fluid Level Estimate & Single String Bullhead Margin calculator available, Reverse Kill & Lubricate & Bleed kill graphs coming in future updates.
Gallery
Screenshots of example calculations. Click on screenshots to view larger image, results may be checked for accuracy against your own methods.
Website Content
Free information & downloadable documents available in CWI Information pages.
Download Calculation Apps for use offline. (Trial version download & licence purchase requires internet connection).
Lifetime updates for all purchases.
Upcoming Releases
Mar
2025
Apr
2025
Jun
2025
Additional Information Pages
Additional information added to download page.
Downloadable document for individual use.
May 2025
New Individual Calculators
Additional individual calculators added for download/trial.
Individual calculators from £3.99 for new purchases.
Free update for existing purchase.
Jul 2025
CWI Tallybook Update
Compilation of more than 36 calculators in one application. Update will include additional calculators & app improvements.
£15.99 for new purchase.
Free update for existing purchase.
Aug 2025
