MP BLOG Continued from page 11
We went through our original notes and NACE publications to develop a new table to present the timeline:
Date September 13, 2008
October 30 to November 1, 2008
2IV]IZa 5IZKP
5IZKP ! ! \W 7K\WJMZ !
Days —
~45
121 178
! Notes
Hurricane Ike—landfall and pipeline breach
Breached subsea connection retrieved from the Gulf of Mexico
Trunkline repaired—dewatering completed
New connection to lateral installed; lateral dewatered
Temporary spool piece on lateral removed and replaced with PBSJ; spool piece in [MZ^QKM ! LIa[ [\IZ\QVO _PMV TI\MZIT _I[ dewatered and production resumed
September 13, 2008 to October 18, 2010
765
Metal coupon removed from trunkline when new connection made; extensive metallurgical examination including SEM and XRD/XRF of interior surface of this pipe coupon
A few quick points: When the oxy-
genated seawater entered the breached pipelines, we know the oxygen will be consumed when it reacts with the pipe wall. Since the conditions become stag- nant, the reaction mechanism will slow, as the oxygen is not being replaced. Ad- ditionally, since microbial population follows an exponential growth rate, we know the interior surfaces of the pipeline will develop their oxide layers before the ;:* _W]TL PI^M OMVMZI\ML [QOVQÅKIV\ volumes of H2
S. We also note that it took
~121 days from the time of the breach to the time the replacement spools were
designed, fabricated, installed, and the trunkline dewatered. It took 178 days un- til the lateral was dewatered and returned to operations. Those time frames were IXXIZMV\Ta []NÅKQMV\ NWZ \PM LM^MTWXUMV\ of the microbiological populations of SRB, based on the measured concentra- tion of H2
S. However, we do concur with
Dr. Reza Javaherdashti that 45 days is QV[]NÅKQMV\