Proven software from NOV CTES, Cerberus for Drilling, incorporates NS-14 from Fearnley Proctor, Inc.

Data Input

Drill String Design and Analysis

• Input well, drill string and fluid
• Analyze torque and drag
• Analyze drill string design
• Perform a detailed review of connection stresses, including seal area stress to prevent galling in drill string components
• Take into account bending and pressures in string tension calculations
• Perform previously complicated and time-consuming drill string design reviews in seconds
• Menu-based software hierarchy
• Graphical well data created automatically

Drill String Design Utility

• Analyze connection stresses that are usually ignored
• DP data sheets created automatically
• Tri-axial drill string design every time

Individual graphs change, depending on dogleg severity and differential pressure.

Cerberus for Drilling features "Quick Look" design reviews in the drill string editor. This makes Cerberus for Drilling a very convenient package for use in "Quick Look" string design projects.

Torque and Drag

Simple or Sophisticated

• Basic analysis for simple "Quick Look" drag charts
• Advanced operations mode for detailed analysis of one drill string
• Capability to quickly compare two drill string options in the same well – for optimization

Drill String Editor

Easily accommodates simple or complex equipment selection

• Quickly choose a string of DP via three drop-boxes

OR

• Enter advanced drill string and connection information to define a specialty drill string component
  

Unique: Stall TorQ™

Stall TorQ is a unique method for preventing drill string twist-offs when performing rotational drilling or milling operations.

• Stall TorQ allows operation design to help prevent twist-off.

Scenarios and Modes

• Create a well by setting up a series of drilling scenarios; i.e., hole selections or bit runs
• Use Basic or Advanced Mode, depending on work requirements
  

Fatigue Analysis

Drill string fatigue is a growing problem with the use of rotary steerable tools to replace motor drilling.

The basis of fatigue analysis is grounded in standard fracture mechanics, plus knowledge of inspection techniques when determining the starting point of any fatigue accumulation. This information is then added to the calculated fatigue build-up during drilling and reaming of hole sections.

NS-14 was created as a drill string design manual to provide engineers with a set of simple tables to use when designing drill strings. The manual includes the calculations upon which all of the tables are based. These calculations are based on API RP7G formulas, or common industry formulas, that were in use by operators at the time NS-14 was compiled. Cerberus for Drilling incorporates most of the calculations in the manual -- often in an enhanced format -- including calculations that are much more complicated than those that one would want to perform by hand. For example, calculating tensile loading in NS-14 is only axial, but in Cerberus for Drilling, combined tension torsion loading on drill pipe tubulars can be adjusted for dogleg severity and internal/external pressure variations.