Hearings: 'Negative test' to measure well pressure performed twice
By David Hammer, The Times-Picayune
May 27, 2010, 10:21AM
This is an update from the joint hearings by the U.S. Coast Guard and Minerals Management Service held in Kenner Thursday into the explosion and fire aboard the Deepwater Horizon oil rig on April 20, which killed 11 workers and created the Gulf of Mexico oil spill currently fouling Louisiana's coast.
Testimony of Jimmy Harrell of Transocean continued:
Jimmy Harrell, Transocean offshore installation manager on the Deepwater Horizon oil rig, testifies during a joint hearing held by the Coast Guard and the Interior Department's Minerals Management Service in Kenner, La., Thursday. The hearing was held to investigate last month's explosion of the Deepwater Horizon, which has caused a massive oil spill in the Gulf of Mexico.Members of the investigative board also asked Harrell questions that followed up on Wednesday's testimony by Douglas Brown, the rig's chief mechanic. Brown had said Harrell got into a "skirmish" with BP's company man at a meeting the morning of the incident. Harrell said he actually expressed concern to BP company man Robert Kaluza that a new drilling plan did not include a key test at a morning meeting April 19, the day before the accident.
Harrell said Kaluza's plan did not include a "negative test" to measure pressure in the well, and Harrell said he made sure the test was done before he would agree to displace mud from the riser with lighter seawater. He said he was successful at getting BP to authorize the test and, in fact, the test was performed twice. Harrell said the other BP company man, Don Vidrine, wanted to do the second negative test.
Harrell said he was happy with the results of the two negative tests, which, ideally, would have shown no drilling mud being returned to the rig. But he acknowledged that the first negative test returned 23 barrels of mud and the second test returned 15 barrels. According to previous testimony, there was a total of 51 barrels of mud in the hole.
Federal regulations require drilling rigs to perform a definitive test of the integrity of a well's cement -- called a cement bond log -- if there are concerns with the results of negative and positive pressure tests. Harrell said BP had a team from Schlumberger at the ready to perform a cement bond log, but Harrell said he was happy with the results of the negative test.
A Schlumberger official told The Times-Picayune last week that the team of testers was sent home at 11 a.m. the morning of the accident without ever conducting the cement bond log.
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