I have never seen Petrobras mentioning high depletion rates in their mature fields before.
Here is the article
http://online.wsj.com/article/SB1000142 ... _whatsNewsA senior executive at Brazil's Petróleo Brasileiro SA, or Petrobras, blamed rising costs at the company on higher imports of refined oil products and maintenance shutdowns at some of its oil facilities.
In an interview, Petrobras' Chief Financial Officer Almir Barbassa highlighted the problem of high depletion rates at some of the state-owned energy company's mature oil fields in the Campos Basin, but said it was working on new technologies to stabilize output there.
Bloomberg News
Petrobas is working on technology that could boost output at mature oil fields, says CFO Almir Barbassa, shown above in São Paulo in March.
.Petrobras earlier this week reported that its second-quarter profit rose 32% from year-ago levels to 10.94 billion reais ($6.88 billion). But an increase in costs meant it was unable to fully benefit from a sharp rise in global oil prices, which reached a high of $127 a barrel in April.
Part of that was because Petrobras was forced to import more oil products such as jet fuel, diesel, gasoline and naphtha, which it doesn't produce enough of to satisfy domestic demand, Mr. Barbassa said. Also, some of the company's offshore production platforms had to be shut during the quarter for maintenance.
Another factor was the rising cost of arresting production declines in some of Petrobras' older fields. Depletion in the mature offshore fields of the Campos Basin, which account for more than half of Petrobras' domestic production, has been accelerating since early 2009, and in some places is as high as 20% a year, according to analysts at Credit Suisse.
For years, Petrobras has been injecting water into the Campos fields to keep flagging oil output stable. But that can sometimes lead to a higher water content in the oil that is produced. Mr. Barbassa said Petrobras is working on a new kind of device which will separate the water from the oil before it reaches the production platform. "If it works well, then it will revolutionize production and output from the Campos Basin will increase," he said.
Petrobras is spending $224.7 billion over five years to develop a series of massive offshore oil fields that lie beneath a thick layer of salt under the ocean floor—the biggest investment program in the oil industry. One field, Lula, the largest discovery in Brazil's history, is estimated to hold recoverable reserves of between 5 billion and 8 billion barrels of oil. But output from these fields has been slow to ramp up and Petrobras is still heavily reliant on its older fields.
Weighing on Petrobras' second-quarter earnings was a 2.28 billion reais loss in its refining and transport division. State policy in Brazil dictates that Petrobras has to keep its gasoline and diesel prices fixed, which prevented it from passing on rising global oil prices to consumers.
But Mr. Barbassa says that the policy has, more often than not, worked in Petrobras' favor. "Up to the end of last year we had better prices in Brazil than abroad," he said. He defended the pricing policy, saying it means "a more stable cash flow for the company and consumers don't suffer the consequences of volatile prices."