(Equip.(Accumulator)

7/27/2019 (Equip.(Accumulator)

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Closing Unit


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Closing Unit


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1-Shear rams open

Shear Rams operation


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2-Shear rams closing



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3-Shear rams closed



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BOP closing unit ( Koomey uni t )


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SCHEMATIC FOR CLOSING UNIT

21

3

5

6

4

7

8

9

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11

12

13

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15

16 17 18

19

20


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Accumulators

Standard bladder type


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Each bottle is called ten gallons bottle

3000 psi

1200 psi

Usable fluid

(Recoverable oil)

N

Oil

Accumulator Bottle

The Precharge pressure is 1000 psi for the 3000 psi working

pressure accumulator unit

Minimum working pressure is 200 psi above precharge pressure


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1. Bottles to be able to (with pumps off)- Close annular- Close all rams- Open one HCR

- Remaining pressure shall be at least 200 psi aboveprecharge pressure (1200 psi ).

2. Useable Fluid: Fluid recoverable between operating

pressure (3000 psi) and minimum operating pressure(1200 psi) or (200 psi) above pre charge pressure.

Information from the API RP53


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3. Reservoir Capacity:At least twice useable fluid of

bottles.

4. Accumulator precharge

A. The precharge pressure should be measured each

well

B. Minimum precharge pressure for 3000 psi workingpressure accumulator should be 1000 psi

C. Only nitrogen gas should be used.


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5-Pump Systems

With accumulators isolated pump should be capable of closing

the annular and open the hydraulic choke (HCR) and return

system to normal annular pressure in 2 minutes.

Electric pump will automatically start when system pressure has

decreased to 90% of system working pressure.

A pump system consists of one or more pump each pump should

have independent power source.


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7. Pressure Test FrequencyPressure test on well control equipment should be at least:

1. Prior to spud or upon installation.

2. After disconnection or repair of any component

3. Not to exceed 21 days.

6. Closing time RAM Annular

Smaller than 18 30 sec max. 30 sec max.

18 and larger 30 sec max. 45 sec max.


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8. Shell or Body Test at manufacturer Shop

1 times BOP rating I.e. 150% of pressure rating.

9. Closing RatioRatio of well head pressure to pressure required to close the BOP.


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10. Choke Lines1. Minimum recommended size for choke line is 2 inches for 3K and

5K arrangements and 3 inch for 10K and 15K.2. Minimum recommended inside diameter for lines downstream of

choke should be equal to or greater than the connecting lines of

the choke (choke line).3. The bleed line should be at least equal in diameter to the choke

line this line allows:a) Circulation of well with preventors closed while

maintaining a minimum back pressure.

b) Permits high volume bleed off of well fluids to relievecasing pressure with the preventers close.


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Remote control panel


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Remote control panel

When the BOP ram in the close position close line has 1500 psi.

When the BOP ram in the open position open line has 1500 psi.

When the 4 way valve shifts the micro switch will activate the light to illuminate.

When light illuminates, it tells us that oil on its way to the BOP function.

Rig air

120 psi

4 Way valve and

micro switch

Oil


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Indicator Lights on BOP Remote Panel

A micro switch is located at the main unit, it will send a

signal to the indicator lights to change color only when the

4-way valve shifts.

Indicator lights, dont tell usthat the BOPs function

has completed, but they tell us that the 4-way valve is

already shifted and the oil is flowing under pressure to

move the functions piston to complete the close or openoperations.


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indicator lights Problem

while shutting in a well from remote panel

2.If indicator light does not illuminate and pressure gaugesdont drop, it means that no oil has been used and BOPpiston does not move, the cause could be

a)4-way valve failed to shift.b)Master control valve is not depressed

with the control valve of the function.

c)No air pressure is going to the remote panel.

1.If indicator light does not illuminate, but gauges dropand later rise back up which means that oil has beenused to move the piston of the BOP and the function iscompleted so the cause is (BULB has blown).


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indicator lights Problem

4.If indicator light illuminates and pressure droppedbut not rise back up it means that oil has beenused, function completed but there is LEAK inhydraulic system.

5.If indicator light illuminates and pressure droppedthen the manifold pressure raised back up to 1500psi but accumulates pressure did not raise back up to3000 psi.

3.If indicator light illuminates but pressure gauges do not

drop it means that the 4-way valves has shifted buthydraulic line between the 4-way valve and the BOP isplugged.

(Equip.(Accumulator)

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