British gas egypt incident investigation 7 th august 2013
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British Gas Egypt Incident Investigation – 7 th August 2013. MPO Flow diagram Tap Root Investigations BG 7 th August 2013 NSD Equipment. 5-1/8” 10k Valve N1 failed during operations Casual Factors Identified, Proposed Recommendations & Verification Needs Improvement Support Data .

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British Gas Egypt Incident Investigation – 7 th August 2013

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British gas egypt incident investigation 7 th august 2013

British Gas Egypt Incident Investigation – 7th August 2013

  • MPO Flow diagram Tap Root Investigations BG 7th August 2013

  • NSD Equipment. 5-1/8” 10k Valve N1 failed during operations

  • Casual Factors Identified, Proposed Recommendations & Verification

  • Needs Improvement

  • Support Data


Taproot investigations 7 th august 2013

TapRoot Investigations – 7th August 2013

Onsite Supervisor

informs DSV

of problems

Review Process

Incident Reports etc.,

Received

Client Visit & Review

A

Presentation of corrective action plan

Onsite Supervisor

informs MPO

Management

Consolidate Data / Fact Find

  • Ops Team & QHSE, commence reviewing reports.

Implementation

Initiate internal review with crews

NI


Nsd 5 1 8 10k valve failure 7 th august 2013 taproot investigation

NSD 5-1/8” 10k Valve failure 7th August 2013 TapRoot Investigation

10th August 2013

9th August 2013

7th August 2013, 11:15hrs

7th August 2013, 11:20hrs

NSD Operators observed pressure build up during connection behind N1

NSD Supervisor communicates problem to MPD supervisor

Pressure tested against N1 to 3600psi to test integrity of N1

  • Commenced stripping down of N1Valve on NSD RAM and inspect internals

?

B

N1 valve passing during NSD connection

A

On completion of the strip down of N1

It was found that the gate and seal

Seats had excessive washing

Decision made to isolate NSD RAM

Due to two barriers required

For maintenance to the NSD RAM

Tested against N1 to 3600 psi ,

it was Observed that mud was seen at

Trip tank and that the pressure was not

Stable, indicating that

N1 was washed out, continue

To POOH

Pumping at 550gpm pressure built up to 1500psi

And then bled off to make sure no damage was made

To the IBOP

NI

Mud weight 16.3ppg

Mud solids content not known

Valve internals were all replaced with

New parts & the valve was rebuilt with

Spares from onboard the Rig

Equipment has been in service for more than 1 year and is currently working under an exemption

Left N4 open to complete connection, and by pass to investigate the problem

NI


Nsd 5 1 8 10k valve failure 7 th august 2013 taproot investigation1

NSD 5-1/8” 10k Valve failure 7th August 2013 TapRoot Investigation

11th August, 2013

N1 valve passing during NSD connection

Pressure test NSD RAM & check integrity of N1 valve

B

N1 Valve & RAM was

Pressure tested to 300psi

For 10 mins and witnessed

By Blade Rep

The test pressure was

Then increased to 6500psi

For 15 mins, which resulted in a good test.

NI


British gas egypt incident investigation 7 th august 2013

NSD Casual Factors Identified & Proposed RecommendationsTapRoot Investigation – 7th August 2013


British gas egypt incident investigation 7 th august 2013

Needs Improvement Factors Identified & Proposed RecommendationsTapRoot Investigation – 7th August 2013


British gas egypt incident investigation 7 th august 2013

Support Data – Report of Washout findings by S.Mohammad

Support Data


British gas egypt incident investigation 7 th august 2013

Corrective Actions and Recommendations

  • This is the first well of this type which has been drilled with BG and there are many lessons to be learned and improvement to be made based on experience. HTHP, heavy weight mud and a harsh operating environment is going to be difficult on all the rig circulation systems.

  • The original HAZOP and FMECA covered the potential for a failure of this type and gate valves can have a failure mode where they wash out. MPO would like to limit the time between failures and try to catch any of this type of incident through an improved preventative maintenance schedule.

  • MPO has been disappointed with the performance of the Valves supplied by T3-NOV and will recommend a fleet replacement. This may take some time as the orders for WOM have a long lead time. In the meantime MPO will increase the inspection frequency of this product and carry additional spares.

  • WOM Replacements have already been mobilized to the rig and at the first convenient opportunity the T3 valves will be replaced.


British gas egypt incident investigation 7 th august 2013

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