WordTrees vs Drilling Calculator for Rigs

WordTrees helps you understand English words and keep them close as you read. LOOK UP WITH CONTEXT Search the built-in offline dictionary for definitions, pronunciation, word structure, and related vocabulary. Explore roots and affixes to see how a word is formed. AI analysis is available as a separate, user-initiated option. MAKE VOCABULARY YOUR OWN Save words, organize personal libraries and folders, and review them in a focused study mode. Choose from built-in vocabulary lists or import your own words. READ AND LEARN Browse English articles in a clean in-app reader. Tap a word in the text for a quick explanation, then continue reading. Save articles and resume from your reading history. You can also add supported ebooks to your personal shelf. SEE CONNECTIONS Visual word maps and related-word views make it easier to discover how vocabulary connects. WordTrees combines lookup, reading, and review in one place for everyday English learning and exam preparation. Some AI features require network access and may have usage limits. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

DERRICK is a fast, accurate drilling and well-control calculator for the rig floor. Set up your well once and every calculator pre-fills from it, so you only change what is different today. Built for drilling engineers, toolpushers, company men, mud engineers, and students who need the right number under pressure. - Your active well pre-fills every calculation. Less typing, fewer mistakes. - Tap show your work on any result to see the formula with your exact numbers. - Works fully on device. No account, no sign-in, no tracking. - Field or SI units on every input and result. - iPhone and iPad, with a purpose-built two-pane layout on iPad. CALCULATORS - Pressure and gradient: hydrostatic pressure, equivalent mud weight, equivalent circulating density, bottomhole pressure. - Well control: kill mud weight, formation pressure, MAASP, LOT and FIT to EMW, kick tolerance, gas expansion. - Hydraulics: pump output, annular velocity, strokes and lag, bit hydraulics. - Volumes and capacities: pipe and hole capacity, annular capacity, pipe displacement, slug volumes. - Mud and tubulars: weight up with barite, buoyancy factor, trip margin, and more. MUD WEIGHT WINDOW - See pore pressure, mud weight, ECD and fracture across the whole hole. - Tap or drag the chart to read every value and your margins at any depth. KILL SHEET - Enter shut-in pressures and get kill mud weight, ICP, FCP and a step schedule. - Automatic gas influx indication from the casing to drillpipe differential. AI CO-PILOT - Ask questions grounded in your active well and get clear, field-ready answers. - Explain any calculation, interpret a kick, or draft an end of tour handover. - Decision support only. It always defers to written procedure and the on-site supervisor. HISTORY AND EXPORT - Save any result to your well log with a note, then filter and search the log. - See your activity heatmap and export clean reports. Unlimited wells, the full history, export and reports, unlimited AI, and specialist modules like casing design. PRIVACY - Your wells and calculations stay on your device. No analytics, no ads, no tracking. SAFETY - DERRICK assists calculation. It does not replace your company well-control procedures, the well program, or the judgment of the on-site supervisor. Always verify independently before acting. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/