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70 bytes added ,  15:10, 24 January 2022
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| JIF || Jet impact force || lb
 
| JIF || Jet impact force || lb
 
|-
 
|-
| FFP || Formation fracture pressure || psi
+
| FFP || Formation [[fracture]] pressure || psi
 
|-
 
|-
 
| T% Hhpb || Total percentage hydraulic horsepower at the bit || %
 
| T% Hhpb || Total percentage hydraulic horsepower at the bit || %
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* The density of the liquid (mud weight)
 
* The density of the liquid (mud weight)
   −
The total volume of liquid or shape of the hole have no influence on hydrostatic pressure, but the height of the liquid column (depth) must be measured in the same direction as the force due to gravity, that is, true vertical. This consideration is important in highly deviated and horizontal wellbores. The hydrostatic pressure (P) at any depth in a wellbore is calculated as follows:
+
The total volume of liquid or shape of the hole have no influence on hydrostatic pressure, but the height of the liquid column (depth) must be measured in the same direction as the force due to [[gravity]], that is, true vertical. This consideration is important in highly deviated and horizontal wellbores. The hydrostatic pressure (P) at any depth in a wellbore is calculated as follows:
    
:<math>\mbox{P} = 0.052 \times \mbox{MW} \times \mbox{D}</math>
 
:<math>\mbox{P} = 0.052 \times \mbox{MW} \times \mbox{D}</math>
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Bottoms-up circulation, or ''lag time'', is the time for samples or gas created at the bit to arrive at the surface (via the drilling fluid) for examination. This calculation is dependent on the volume and rate.
 
Bottoms-up circulation, or ''lag time'', is the time for samples or gas created at the bit to arrive at the surface (via the drilling fluid) for examination. This calculation is dependent on the volume and rate.
   −
After calculating wellbore volumes and mud pump output, several parameters for the circulating time of the drilling fluid can be estimated. The most routinely used of these parameters are
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After calculating wellbore volumes and mud pump output, several parameters for the circulating time of the [[drilling fluid]] can be estimated. The most routinely used of these parameters are
    
* surface-to-bit pump strokes,
 
* surface-to-bit pump strokes,
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The hydraulic horsepower at the bit (BHhp) is calculated as for total hydraulic horsepower (THhp), but the mud pump pressure (Pp) is replaced by the jet nozzle pressure loss (JNPL):
 
The hydraulic horsepower at the bit (BHhp) is calculated as for total hydraulic horsepower (THhp), but the mud pump pressure (Pp) is replaced by the jet nozzle pressure loss (JNPL):
   −
:<math>\mbox{BHhp} = (1169 \times 400)/1714 = 273 \mbox{ hp}</math>
+
:<math>\mbox{BHhp} = \frac{1169 \times 400}{1714} = 273 \mbox{ hp}</math>
    
The ''percentage'' of the total hydraulic horsepower expended at the bit is an important parameter to determine and is calculated in two ways:
 
The ''percentage'' of the total hydraulic horsepower expended at the bit is an important parameter to determine and is calculated in two ways:
   −
:<math>\% \mbox{ Hhpb} = (\mbox{BHhp/THhp}) \times 100</math>
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:<math>\% \mbox{ Hhpb} = \frac{\mbox{BHhp}}{\text{THhp}} \times 100</math>
    
or
 
or
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[[Category:Wellsite methods]] [[Category:Pages with unformatted equations]]
 
[[Category:Wellsite methods]] [[Category:Pages with unformatted equations]]
 +
[[Category:Methods in Exploration 10]]

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