Nozzle & Choke Comparison

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Conclusion•The square of the nominal diameter of asingle nozzle is proportional to thesquare of the nominal diameter of asecond nozzle•Comparison of predicated flow change isgood only for the case of all nozzles ofthe same nominal diameter, otherwiseTFA must be figured in the normalmanner

Early West Texas Drilling and Evaluation Technology

Fishing Techniques for Drilling Operations

Derivation•Flow is directly proportional to total flowarea•The flow area of Nozzle A compared toNozzle B is expressed as:•(. (.5D A ) 2 /(. (.5D B ) 2•Simplifying yields D A2 / D2 B•Since the denominators for both nozzles arethe same, they cancel out

Page 1 and 2: Nozzle & ChokeComparisonQuick Calcu
Page 3: Nozzle & ChokeMeasurement•Bit Noz
Page 7 and 8: Example 2•AA bit dressed with six

Nozzle & Choke Comparison

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