# Oilfield Assistant — Drilling Formulas & conversion > Oil and gas industry calculations, specifications, and unit conversions. (iPhone/iPad app by David Suescun.) - Source: https://appshunter.io/ios/app/oilfield-assistant/id942306080 (this page in markdown: same URL + `.md`) - Developer: [David Suescun](https://appshunter.io/developer/942306079) - Category: Productivity, Reference - Price: $5.99 - Rating: 2.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 9.0 · 7 MB - Languages: English - Released: 2015-02-22 - Data updated: 2026-06-25 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/oilfield-assistant/id942306080/reviews.md ## What is Oilfield Assistant? Oilfield Assistant gathers over 100 calculations/equations from the Oil and Gas world. It also includes Casing/Drill Pipe/HW/DC/Tubing Specifications and a convenient Oilfield Units Converter! The App has customizable units including, but not limited to, English and Metric systems. Our calculations: Accumulator Pre-charge Pressure, Actual gas migration rate, Adj. Max. shut-in CSG P, Amount of Cuttings, Annular Capacity, Annular Pressure Loss, Annular Velocity (AV) in ft-min, Bulk Density -Cuttings- Mud Bal, Buoyancy Factor (BF), Calculate dogleg severity, Calculate Influx Height, Casing Specifications, Common Problems - Effects, Cost Per Foot Calculation, Critical Flow Rate, Critical RPM, Cutting Carrying Index, Cutting Slip Velocity Method#1, Cutting Slip Velocity Method#2, d Exponent, DC Weight to avoid DP Buckling, Decrease oil water ratio, Density of oil-water mixture, Depth of washout, Determine OWR- retort analysis, Dilution to Control LGS, Directional Survey Calculation, Displacement of plain pipe, Drill Collar Weight, Drill Collars Specifications, Drill Pipe Specifications, ECD - YP MW less than 13 ppg, ECD - YP MW more than 13 ppg, ECD with Engineering Formula, Effective Viscosity, Equivalent Circulating Density, Estimate Type of Influx (kick), Final Circulating Pressure, Force given pressure and area, Force given pressure and diam, Formation Integrity Test (FIT), Formation P - Kick Analysis, Formation Temperature, Gas migration rate - Empirical, Geology Formulas, Heavy Weight DP Specifications, HP Loss due to Gas Cut, Hydraulic Horse Power (HPP), Hydrostatic P Decrease - POOH, Hydrostatic Pressure (HP), Increase Mud Density - Barite, Increase Mud Density - Hematite, Increase Mud Density -Carbonate, Increase oil water ratio, Initial Circulating Pressure, Inner cylindrical capacity, Kick Tolerance - Stack & V Well, Kick tolerance factor (KTF), Kill Mud Weight, Lag Time Calculation, Leak Off Test (LOT), Length of DP - HP loss - d pull, Length of DP - HP loss - w pull, Light weight spot fill -Balance, Loss of HP - water into annulus, Max Form. P - shut-in well, Max influx height = to MASICP, Max pit gain - gas kick in WBM, Max Surface P - Gas in WBM, Max surface pressure - kick tol, Maximum In Shut-In CSG P, Maximum Rigid Length, Mix diff fluid den- limit space, Mix diff fluids- unlimit. space, New Pressure Loss With New Mud, New Pump Pressure With New Stks, Optimum Flow Rate, Pressure loss in annulus - corr. coef., Pressure loss in drill string with TJC, Pressure loss through the drill string, Pressure required to break circulation, Pipe Elongation Due to Temp, Plastic Viscosity & Yield Point, Power Law Constant, Pressure Drop Across a Bit, Pressure Gradient Calculation, Pressure loss in annulus, Pressure loss in surface equip., Pressure to Mud Weight, Pump out, Pump Pres. & Pump Stroke Rel, Reduce mud weight (dilution), Reynolds Number, Riser Margin, Slug Calculation, Stuck Pipe Calculation, Surge and swab P - Method 1, Surge and swab P - Method 2, Tensile Capacity of Drillpipe, Ton Mile Calculation, Total Bit Rev in Mud Motor, Trip margin calculation, Tubing Specifications, Unit Converter, Unit Settings A MUST for oilfield workers! The app uses formulas from Drilling Data Handbook (IFP Publications). ## Key features - Over 100 oil and gas calculations - Casing/Drill Pipe/HW/DC/Tubing Specifications - Oilfield Units Converter - Customizable units (English/Metric) - Detailed formula explanations ## Frequently asked questions about Oilfield Assistant ### What kind of calculations does Oilfield Assistant offer? Oilfield Assistant offers over 100 calculations crucial for the oil and gas industry, including pressure loss, annular velocity, kick tolerance, and more. It also provides specifications for various pipe types and a unit converter. ### Can I customize the units in Oilfield Assistant? Yes, Oilfield Assistant supports customizable units, including both English and Metric systems. This allows users to adapt the app to their specific regional or project requirements. ### What devices is Oilfield Assistant available on? Oilfield Assistant is available on iPhone, iPad, and iPod devices. It is designed to function across these Apple platforms. ### How often is Oilfield Assistant updated? The latest version of Oilfield Assistant is 2.0.17, which was last updated on December 13, 2018. Users can expect updates to include new features and bug fixes. ### What is the price of Oilfield Assistant? Oilfield Assistant is a paid application, priced at $5.99. This one-time purchase grants access to all its features and calculations. ### What is the age rating for Oilfield Assistant? Oilfield Assistant has an age rating of 4+. This indicates that the content is generally suitable for all ages, with minimal or no objectionable material. ### Does Oilfield Assistant offer offline access to its features? The provided data does not specify whether Oilfield Assistant offers offline access. However, as a calculation and specification tool, it is likely designed to function without a constant internet connection. ### What is the user feedback on Oilfield Assistant? Based on the available rating, Oilfield Assistant has received a rating of 2.0 stars from 1 rating. This suggests that current user satisfaction may be low, and further reviews would be needed for a comprehensive understanding. ## Version history (last 3 releases) ### 2.0.17 — 2018-12-13 - Fixed keyboard bug (that didn't allow user's input) - Improved the speed of the App ### 2.0.14 — 2015-06-02 - Greatly improved the speed of the App - Added loaders between pages - Divided formulas by groups - Changed design to make it more responsive and touch-screen friendly ### 2.0.9 — 2015-02-11 No release notes. ## Apps similar to Oilfield Assistant | App | Rating | Price | Category | | --- | --- | --- | --- | | [iCrane](https://appshunter.io/ios/app/icrane/id1293582206) | — | Free | Productivity | | [Natural Gas Props Calculator](https://appshunter.io/ios/app/natural-gas-props-calculator/id1099217044) | 3.0 (1) | $8.99 | Productivity | | [Trend Micro ID Protection](https://appshunter.io/ios/app/trend-micro-id-protection/id6451011685) | 4.7 (386) | Free | Productivity | | [oneSafe 6](https://appshunter.io/ios/app/onesafe-6/id1593282910) | 3.7 (116) | Free | Productivity | | [INPEX Oil&Gas Unit Conversion](https://appshunter.io/ios/app/inpex-oil-and-gas-unit-conversion/id691283244) | — | Free | Productivity | | [Invitation Card Maker Design](https://appshunter.io/ios/app/invitation-card-maker-design/id6446843073) | — | Free | Productivity | ## More apps by David Suescun - [#TrabajoSíHay](https://appshunter.io/ios/app/trabajosihay/id1501415249) All apps by David Suescun: https://appshunter.io/developer/942306079 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*