Volume of Cutting Generated While Drilling

While drilling, cuttings are generated every footage drilled and this topic will demonstrate how to determine volume of cutting entering into the wellbore.

Figure 1 - Cutting Generated While Drilling

Figure 1 – Cutting Generated While Drilling

 The following formula is used to calculate cutting volume generated while drilling;

vc - bbl per hour

Where;

Vc is volume of cutting in bbl/hr.

Ø is formation porosity (%).

D is wellbore diameter in inch.

ROP is rate of penetration in feet per hour.

Vc can be presented in several unit as follows;

Vc in gallon per hour is shown below;

vc - gallon per hour

Vc in gallon per minute is shown below;

vc - gallon per minute

Example: Determine volume of cutting in gallon per hour entering into the well bases on the following information.

Well depth 9,500’ MD/8,000’ TVD.

Average ROP = 80 fph

Average formation porosity = 20 %

Bit size = 8-1/2”

Assume gauge hole

Figure 2 - Well and Drilling Information

Figure 2 – Well and Drilling Information

 

Vc in gallon per hour is shown below;

vc - gallon per hour (example)

Vc = 188.8 gallon/hr

This figure tells you that with the drilling parameter, you must be able to remove the cutting faster than what you generate in order to eliminate operation issues as stuck pipe.

Reference book => formulas-and-calculationFormulas and Calculations for Drilling Operations 

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One Response to Volume of Cutting Generated While Drilling

  1. Teklebrhan says:

    it is realy intersting course! thanks for providing us

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