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World Oilfield Forum
What should be the surface pressure? Given the following:
MW = 8.9 ppg
depth=8950 ft
8.5 inch hole using a PDC bit, with 6 x 18 nozzles, last casing 13- 3/8" at 8570'
Please explain how to get the pressure losses in relation to the first question?
Tags: calculating, pressure, surface
Views: 903
Permalink Reply by Sergei Tchernenkov on Your pressure losses will vary with the flow rate and mud viscosity. There is not enough data to calculate the total pressure loss now.
When you would have all required data, you may find all formulas in many Drilling Handbooks. But the easiest for understanding, from my point of view, is Norton Lapeyruse's "Formulas and Calculations for Drilling, Production, and Workover". You can find it through the links on the Drilling Ahead browser toolbar.
Permalink Reply by Wayne Nash on 
Permalink Reply by Mohamed Boumezrag on There are many parameters that enters into account when calculating pressure losses such as drill string geometry, mud rehology and flow type. You 'll find more details on "Drilling data handbook" section G.
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Permalink Reply by nkaya burel on 
Permalink Reply by Lito Panis on Permalink Reply by nkaya burel on acording to this type of fluid we can use power law model to calculate the pressure. first of all you have to know the type of flow (tubulent or laminar) that you have in each section by calculating RENOLDS NUMBER.
- inside the DP, HWDP and DC.
if you have laminar flow or turbulent flow, you can use the appropriate formulas. you look in Drilling data hand book page G18
-in the annulus between your drilling string and the casing or the open hole you'll do the same operation by conidering your annulus size. the appropriate formuas you'll find it in th same page than the previous one .
Permalink Reply by Lito Panis on 
Permalink Reply by Rune Andersen on you must not rely to any rule of thumb if there is any. Every well is different, different BHA`s different mud systems, what about your drill string, liners in mudpump etc.
you better start your calculations.
Permalink Reply by MOHSEN YAVARI on Lito,
for calculate surface pressure , you have to send string size (DPs , HWDPs & DCs & Motor )
Permalink Reply by Kim Bufton on Not enough info, you need pressure drop (loss) of surface lines (standpipe kellyhose), drill pipe, HWDP and Collars as well as any other dynamic influences as in MWD, motor, Underreamer jetting etc etc. Less important, but required for calculations while drilling is annular cuttings load etc.
You cant work out SPP just by bit nozzles, mud weight and a TV depth
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