Torque and Drag

Is your equipment suited to drill the well?

Can you get the casing to bottom?

Need to monitor hole cleaning?

No time for complex and tedious data input?

 

Softdrill NL Torque & Drag!

Based on a proven prediction model, Softdrill NL Torque & Drag calculates surface tension and torque on drill pipe, casing or tubing. An exhaustive database with pipe specifications is included to make data input as easy as possible. Particularly useful on deviated and horizontal wells, Torque & Drag can be used for equipment selection, drillstring failure prevention, comparison of calculated and actual hookloads to ensure correct hole cleaning and even to calculate the required slack off weight to set a packer.

Shared with all Softdrill NL programs, the Well Reporting System incorporates a framework to handle storing, displaying and printing of data in any unit of measurement.  Units  may be changed “on the fly” and settings can be saved to file for easy switching to any desired combination.

Operational scenario

The primary calculation mode is the Operational Scenario which produces both numerical and graphical output for all operational modes (pick up, slack off, rotary drilling, etc.).  A variety of modeling parameters are available; soft or stiff string, ‘Chen & Cheatham’ or ‘Wu & Juvkam-Wold’ helical buckling, safety factor, margin of overpull, etc.

Any occurrence of sinusoidal or helical pipe buckling can easily be identified on the graphical output.  This is used to prevent drillstring failure but is also useful for predicting drillstring “hang-up” in non-rotating drilling or casing/tubing running scenario’s.

Results can be printed in a detailed or summary report, including the graphs and user-defined logo’s.

Trip log

The secondary calculation mode is the Trip Log mode. This mode calculates surface tension and torque for a series of measured depths along the well trajectory as the string is pulled out of hole.

The ability to plot actual data values (driller’s trendsheet) in the resulting graph enables detection of abnormal hookloads and the onset of inadequate hole cleaning.

Calculate Friction Factors

The tertiary calculation mode is the calculation of Friction Factors from actual surface tension and torque values observed.  Calculation of friction factors is typically done in two steps:

  1. Surface readings (tension & torque) are taken with the BHA inside the casing shoe.  Using Torque and Drag, the friction factor for casing is then back calculated and compared against previous BHA runs.
  2. Using the above determined friction factor for casing section, the friction factor for open hole is back-calculated from surface reading with the BHA in open hole.

This calculation mode is particularly useful for determining friction factor in a field and applying them to torque and drag models for planned wells.