Lapindo Disaster Caused By Human Error: Study
Paris. Drilling firm PT Lapindo Brantas, owned by Golkar Party chairman Aburizal Bakrie, was to blame for unleashing a mud volcano in East Java that claimed 14 lives and displaced tens of thousands of people, a major international study has concluded.
In a paper published by the journal Marine and Petroleum Geology, a group led by experts from Britain’s Durham University, said the new clues bolstered suspicions the catastrophe was caused by human error.
Lapindo Brantas maintained in the same journal that the “Lusi” mud volcano was unleashed by an earthquake at Yogyakarta, 280 kilometers away.
Lusi’s mud has been devouring land and homes in Sidoarjo district since May 2006, imperilling as many as 100,000 people through subsidence and inflicting damage at $4.9 billion, according to an estimate by an Australian expert.
Durham professor Richard Davies said drillers, looking for gas nearby, had made a series of mistakes.
They had overestimated the pressure the well could tolerate, and had not placed protective casing around a section of open well.
Then, after failing to find any gas, they hauled the drill out while the hole was extremely unstable. By withdrawing the drill, they exposed the well hole to a “kick” from pressurised water and gas from surrounding rock formations.
The result was a volcano-like inflow that the drillers tried in vain to stop, he said.
“We found that one of the on-site daily drilling reports states that Lapindo Brantas pumped heavy drilling mud into the well to try to stop the mud volcano,” Davies said in a press release.
By pumping in this heavy mud, the drillers had hoped to create sufficient pressure in the column of the well hole to block the fluid pouring in from the rupture, Davies said.
“This was partially successful, and the eruption of the mud volcano slowed down. The fact that the eruption slowed provides the first conclusive evidence that the bore hole was connected to the volcano at the time of eruption.”
He added: “This is the clearest evidence uncovered so far that the Lusi mud volcano was triggered by drilling. We have detailed data, collected over two years, that show the events that led to the creation of the Lusi volcano.”
A co-author of the discussion paper, Michael Manga, a professor at the University of California at Berkeley, added the Yogyakarta quake was too small and distant to have caused Lusi. “The stresses produced by the earthquake were minute,” he said.
Arguments over the causes of Lusi have become a political issue in Indonesia. The House of Representatives in September 2009 said they had found no evidence of negligence on the part of Lapindo and declared that the mudflow was caused by a natural disaster.
In 2008, scientists from around the world at the conference of the American Association of Petroleum Geologists in Cape Town, including Davies, voted that the disaster was triggered by drilling activity.
but in the previous statement by the House (DPR)
Sidoarjo Mudflow is a Natural Disaster, House Declares
The hot mud eruption that has evicted thousands of people in Sidoarjo, East Java is a natural phenomenon and not the result of gas drilling, Indonesia’s House of Representatives said on Tuesday.
Speaking at a House plenary session , Priyo Budi Santoso, deputy chairman of a House team supervising the disaster, said the team’s research found no evidence the mudflow was caused by human error.
“We urge the government to immediately define the status of the Sidoarjo mudflow as a natural disaster,” Priyo said.
The team also voiced support for previous decisions by the police and the Supreme Court that there was insufficient evidence to charge PT Lapindo Brantas, the company whose gas well has been accused of causing the eruption.
PT Lapindo Brantas is part of the Bakrie Group, which is controlled by the family of Coordinating Minister for People’s Welfare Aburizal Bakrie.
The House also recommended the government use the mudflow location for geological study and tourism.
Hot mud first began flowing from a crack near a Lapindo exploratory gas well on May 29, 2006. It formed a pool that soon expanded into a mud lake, swallowing houses, factories and schools. The company has blamed the eruption on the Yogyakarta earthquake, which wreaked destruction in Central Java just two days earlier. But many scientists have disputed that claim, pointing instead to what they say were faulty drilling practices.