Drill Collar Capacity and Displacement Chart

Oilfield Chart - Drill Collar Capacity and Displacement Chart

The Drill Collar Capacities and Displacement Chart shows the numerical values for outer diameter, internal diameter, capacity, and displacements.

The table is useful for determining the correct drill collar type, knowing which drill collar is appropriate between the drill pipe and a bit, and finding the best drill collar for certain drilling conditions and completions in the gas and oil industry.

Relationship among Internal, External Diameter, Capacity, and Displacements

The Displacement and Drill Collar Capacity Table shows the relationship among the dimensions, capacity, and displacements. Both capacity and displacement increase in relation to the outer diameter and inner diameter.

An increase in outer diameter increases the inner diameter (in inches), but the inner diameter only changes slightly.  It is possible for a pipe or drill collar to increase in outer diameter while keeping its inner diameter constant.

Definition of Terms

  • Annular volume is a fluid volume between the cylindrical objects’ two diameter length per volume.
  • Drill collar is a tubular connector or piece between the bit and drill pipe.  The drill collar is used to pump drilling fluid through the drill string and concentrate weight to the drill bit.
  • Displacement refers to the volume of fluid displaced in relation to the steel volume.  Water is displaced when the tube, drill pipe, and those with closed ends are put in or pulled out.
  • Hydrostatic pressure is the pressure made by the liquid weight in a confined space.
  • Pressure gradient describes a spatial definition or a direction of flow.

 

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Drill Collar Capacity and Displacement Chart

DC OD (in)DC ID (in)DC Cpty (bbl/ft)Steel Displ. (bbl/ft)Closed-End (bbl/ft)
wdt_IDDC OD (in)DC ID (in)DC Cpty (bbl/ft)Steel Displ. (bbl/ft)Closed-End (bbl/ft)
13 ⅛1.2500.001520.0080.0095
23 ¾1.5000.002190.01150.0137
34 ⅛2.0000.003890.01260.0165
44 ¾2.0000.003890.01810.0219
562.2500.004920.03010.0350
66 ¼2.5000.006070.03180.0379
76 1/22.5000.006070.0350.0410
882.8130.007680.05450.0622
98 ¼2.8750.008030.05890.0661
108 1/22.8750.008030.06220.0629

The Table for Drill Collar Capacity and Displacement shows the following columns and their numerical values.

Outer Diameter (in) is the measurement from the pipe’s outer wall to the other side – from top to bottom and left to right.

   OD = N + 2 / P

Inside Diameter (in) is the measurement from the pipe’s inner wall to the other side – from top to bottom and left to right.

   ID = OD – Wall Thickness (2X)

Where outer diameter is subtracted by wall thickness and multiplied by 2.

Capacity refers to the measure of the drill collar’s internal area, expressed in length/volume, usually bbl/ft or gal/ft.

Displacement is measured in gallons per feet.  It pertains to the volume of fluid displaced in relation to the pipe’s volume. To calculate, here is the formula:

Pipe Displacement in bbl/ft = (Outer Diameter in (2x) – Internal Diameter in (2x) – ) / 1029.4

Note:  The outer diameter of the pipe (inches) and the inner diameter of the pipe are in inches. This formula is not meant for closed-end displacement.

Drill Collar Capacity and Displacement Chart Abbreviations:

  • OD – Outside Diameter
  • ID – Inside Diameter
  • DC Cpty – Drill Collar Capacity
  • bbl/ft – barrel per foot

Go here if you are looking for the Sucker Rod Chemical, Grade and Strength Chart.