Saturday, 4 November 2017

DRILL COLLAR WEIGHT CALCULATIONS - WHAT IS THE DIFFERENCE BETWEEN PRESSURE AREA METHOD AND BUOYANCY FACTOR METHOD

Drill Collars Weight Design & Calculations 

Buoyancy Factor Method Vs Pressure Area Method


Drill Collars weight Design & Calculations BUOYANCE FACTOR PRESSURE AREA
Buoyancy factor method vs pressure area method

Comparison between the Buoyancy Factor Method and the Pressure Area Method for the Drill Collar weight calculations.

  • The buckling neutral point is the same in both cases. 
  • Either of the two methods can be used to calculate the length of the Drill Collar

However, the Pressure Area Method has the following disadvantages:

  • Requires more Drill Collars to keep the Heavy Weight Drill Pipe HWDP or Drill Pipes in tension. This serves no useful purpose because whether the pipe above the buckling neutral point is in tension or compression is irrelevant to fatigue damage, if the pipe is not buckled.
  • The need to procure, transport, maintain, inspect and handle the extra Drill Collars increase the cost of the drilling operation



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