This topic will demonstrate you how to determine accumulator bottles required for Koomey Unit (Accumulator Unit) in order to close the surface BOP stack.
This is a specification of Accumulator (Koomey) Unit.
Accumulator 3,000 psi system
Volume each bottle is 10 gallon.
Pre charge pressure is 1,000 psi.
Minimum operating pressure is 1,200 psi (200 psi over pre charge pressure)
Usable fluid per gallon is 5 gallon.
Safety factor require is 50 %. This safety factor may be different depending on each company’s requirement.
BOP Stack and HCR’s as listed below:
|| Gallon to open
|| Gallon to close
| Annular Preventor
| Upper Pipe Rams
| Blind Shear Rams
| Lower Pipe Rams
| Choke HCR
| Kill HCR
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Their kill sheets are Excel files and they support several applications (surface stack, subsea stack, volumetric, lubricate and bleed, bullheading). There are several advantages from these well control kill sheets such as
• Solve problem either simple or complex wells
• Available for multiple casing, liner and tubular sizes
• Semi-automatically draw charts and graphs
• Calculate and display critical well control parameters
• Calculate how many bleed cycles required for volumetric well control
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• Injection fluid vs pressure bleed down for Lube and Bleed
• Safety and working margins are established
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This is the second up date of drilling formula spread sheet, Drilling Formula Excel Sheet Version 1.2.
Drillingformulas.com distributed the first version of drilling formula spread sheet on 28 March 2011 and another update on 18 May 2011. The calculation sheet has been downloaded over 8,300 times around the world since the fist distribution.
Today, the lasted up date of drilling formula spread sheet, Drilling Formula Excel Sheet Version 1.2 is available for you to download. It is still totally FREE !!!.
Click here to get the drilling formulas spread sheet.
What new drilling formulas are added into this version?
Cutting Slip Velocity Method#1
Cutting Slip Velocity Method#2
Surge and Swab Pressure Method#1
Surge and Swab Pressure Method#2
Total Flow Area Table
Calculate Influx Height
Hydrostatic Pressure Loss Due to Gas Cut Mud
Kill Weight Mud
Maximum pit gain from gas kick in water based mud
Maximum Surface Pressure from Gas Influx in Water Based Mud
How many total useful drilling formulas in this version?
There are a total of 75 formulas which are divided into 7 categories (Applied Drilling Formulas, Basic Drilling Formulas, Directional Drilling Calculation, Drilling Fluid Formulas, Engineering Formulas, Hydraulic Formulas and Well Control Formulas).
How much will it cost?
Nothing. The spread sheet is totally FREE for everybody.
This example demonstrates how to determine drill pipe pressure schedule for wait and weight method.
Current mud weight = 9.5 ppg
Pump output = 0.1 bbl/stroke
Well depth = 9000’MD/9000’TVD
Drill string capacity = 0.0178 bbl/ft
Surface line volume = 15 bbl.
Shut in casing pressure = 700 psi
Shut in drill pipe pressure = 500 psi
ICP = 1600 psi at 30 spm as kill rate
Please follow steps below to determine the drill pipe pressure schedule (step down chart).
There are some well control formulas that you need to know for wait and weight method.
1. Kill Weight Mud
KWM = OMW + [SIDPP ÷ (0.052 x TVD)]
KWM is kill weight mud in ppg.
OMW is original mud weight in ppg.
SIDPP is shut in drill pipe pressure in psi.
TVD is true vertical depth of the well in ft.
Note: Read more about it>> Kill Weight Mud