TADPRO - Torque and Drag
The prevalence of extended-reach directional wells today means that pipes are exposed to greater amounts of torque and drag (T&D). If the torque and drag are not evaluated, it can result in stuck pipe, pipe failures, and costly fishing jobs. With the number of extended-reach wells increasing, torque and drag modeling has become an essential process during the planning phase of drilling and casing running.
TADPRO is a comprehensive software package that accurately predicts torque and drag, removing several risks involved in drilling and completion operations. TADPRO helps users understand the visible, see the invisible and obtain a higher percentage of successful drilling and tripping operations.
- Survey import from Excel®, text or PDF® file
- Survey tortuosity
- Drilling, back reaming, rotating, and tripping operations
- Stiff string model
- Buckling calculations
- Sensitivity analysis on friction factor
- Friction factor calibration
- 2D/3D animation
- Liner cementing job
- Casing flotation
- Packer setting
- Field data comparison
- Graph customization
- Graph formatting options
- Microsoft Word® report
- US oil field, SI and customized units
- Multi-language: English, Spanish, Chinese, Russian and Portuguese
- White Paper
Q1. How are friction factors (FFs) defined in TADPRO?
FFs are defined in Wellbore Interval table. Cased hole friction factors (CHFFs) and open hole friction factors (OHFFs) are defined separately. These are user defined values, though recommended values are accessible using the quick help feature next to the FF portion of the table (the question mark button).
For sections of the string that have tools or centralizers, the friction factor might be reduced or changed. This can be accounted for at the bottom of the detailed table for each component by using a percent friction reduction.
If the tools/centralizers are free to rotate relative to the string, the rotational FF is used to calculate torque instead of the values listed in the wellbore intervals table.
Q2. What is the calculation interval option?
It defines the locations of string bottom where the torque and drag profile is calculated. The smaller the calculation interval, the longer the calculation time.
The calculation interval simply determines how often points are calculated/placed in the history graphs. History graphs are hook load and surface torque, as well as stretch and twist graphs. The default interval is 100 ft, though smaller intervals can be chosen to increase the accuracy or smoothness of the history graphs. Since a full set of profile tables/graphs (side force/axial force/torque) are needed for each point placed in a history graph, choosing a small calculation interval can increase the required calculation time.
Q3. What is the “Calculation on survey points” option?
T&D software calculates in small segments and cumulatively sums the results, beginning at the bottom of the string and working up to the surface. Choosing the ‘calculate on survey points’ option will set the segment length to the distance between survey points, as reflected in the survey. Surveys with a 100 ft interval for a 15,000 ft well would result in 150 separate sections over which torsional and axial forces are determined.
For each string bottom location, in order to calculate torque and drag, the pipe is divided into many elements. Each component should have the same mud weight, wellbore size, pipe geometry and dogleg. Calculation on survey points ensures the same dogleg in each component.
Q4. What does the “Calculate torque and drag without FF reduction” option do?
This will run an automated comparison between the T&D model as set up and the T&D model without friction reduction applied. The without friction reduction T&D model affects the pipe tab only by setting the ‘FF reduction’ to zero and the tool/centralizer ‘free to rotate’ box to unchecked for all pipe components.
Q5. What is the side force normalization length, and how does it affect side force?
Side force is calculated as a force per distance (i.e. lb/ft). The normalization length simply multiplies the force per unit distance by a length. The normalization length does not affect the calculations, but rather the numbers displayed in the side force graph. At 100 lb/ft, a normalization length of 31 ft would show 3,100 lbs in the graph vs. a normalization length of 40 ft resulting in 4,000 lbs on that same graph.
When the side force is set to ‘per joint’, the normalization length will default to the joint length for each pipe component. It is therefore possible to have the side force normalized for different length components in the same graph, such as 31 ft for drill pipe and 40 ft for casing/liner.
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This 280-page reference manual containing over 200 full-color illustrations. This best-selling manual is one of the most comprehensive works available on the physics pertaining to the problem of stuck pipe. Written in an easy-to-understand, and entertaining format, Trouble-Free Drilling is an invaluable tool for rig-site supervisors, drillers, and drilling engineers.
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Fundamentals of Drilling Engineering, an update of the classic Applied Drilling Engineering (Textbook Series Vol. 2), takes a new look at the basics of drilling engineering. Chapters are written by experts from industry and academia and provide numerous example problems to reinforce the concepts presented. This book is essential for undergraduate and graduate students, as well as industry professionals trying to gain detailed knowledge of basic drilling concepts.
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- Microsoft Windows® 7, Windows® 8/8.1, Windows® 10
- 2010 or later
- Dual core processor, 1.4 GHz or faster
- 4 GB RAM
- 200 MB of free disk space for installation
- 1,280 x 768 display resolution with true color or higher with small font
- Setup file can be accessed from a download link or installation CD provided by PVI