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* President met oil firms, banks before sacking dos Santos
* Working group discovered near paralysis of Sonangol
* Debts, new projects need to get priority in future
* Lourenço quickly changes Angolan political landscape
LUANDA/LONDON, Nov 23 (Reuters) - On Oct. 6, with the dust still settling on Angola's first change of power in 38 years, new President João Lourenço sat down with international oil majors at the presidential palace in Luanda.
The top executives in Angola of Chevron, Total , BP, Eni and Exxon said the oil sector was being devastated by delays in project approvals at Sonangol and a backlog of payments owed by the state oil company, according to four oil industry sources with knowledge of the meeting.
They warned Lourenço that Angola's production would decline from 2019 unless swift action was taken to tackle problems at the firm, which was headed by Isabel dos Santos, daughter of his presidential predecessor, the sources said. They declined to be named because the discussions were confidential.
Six weeks later the president fired dos Santos, Africa's richest woman who is nicknamed the "princess" in Angola.
The oil majors all declined to comment on the meeting. Lourenço's office and Sonangol did not respond to requests for comment.
It was a highly unusual gathering; foreign oil firms operate nearly all of Angola's production and hold huge sway, but meeting the president as a united group was almost unheard of.
The nature of the discussions has not been previously reported. The talks, and subsequent events leading up to dos Santos' dismissal, shed light on the reasons behind her ouster - a decision never officially explained.
They offer new insight into the current state of the most important company in Angola, which relies on oil for a third of its economic output and over 95 percent of exports, and the big challenges facing the new management of the debt-laden firm.
The dismissal also points to the waning power of the dos Santos family, which has dominated Angolan politics and business for decades. Isabel dos Santos' father José Eduardo had ruled the country since 1979, amassing wealth for his relatives who own companies in almost every part of the economy.
Billionaire dos Santos, who had been Sonangol chair since June 2016, has said she was in the process of restructuring to root out waste and corruption at a company that was struggling even before oil prices plunged in mid-2014.
Her representatives declined to comment for this story, and instead pointed Reuters to two statements, issued in the days after her exit, when she outlined her achievements including reducing debt to $7 billion from $13 billion, raising annual revenue to $15.6 billion from $14.8 billion and cutting costs.
In her departing speech to staff, she said the company had been "nearly bankrupt" when she took over, devastated by the oil-price collapse. "Memories are short," she added.
However, according to interviews with 10 sources, including the four oil industry sources as well as officials from Sonangol and the government, Lourenço was frustrated with the slow pace of change at the company.
On Oct. 13, a week after meeting the oil majors and 17 days after taking office, the president ordered government ministers, Sonangol and international oil companies to form a 30-day working group to review the state of the industry.
The group's meetings, many of them led by new Secretary of State for Oil Carlos Saturnino, were tense, the sources said. Saturnino, an oil industry veteran, had been fired by dos Santos from his role as head of production and exploration at Sonangol last year when she accused him of gross mismanagement.
Even though dos Santos had launched a turnaround plan, huge hold-ups in the approval of projects were strangling the oil sector, according to the sources. Her board had implemented a system for checking projects submitted by foreign oil companies which in practice exacerbated the problem, they said.
She had also created a gulf between her board and the rest of the company by surrounding herself with foreign consultants, said the people, who declined to be named due to the confidential nature of the industry review and related discussions.
The working group concluded there was "a near paralysis" at Sonangol, according to a government source.
As the group assessed the state of the industry, Lourenço met with Sonangol's biggest lenders - including the Bank of China, Standard Bank and Standard Chartered - to understand Sonangol's financial situation and secure lower lending rates, according to a source familiar with the talks.
"Lourenço realised Sonangol needs money fast," said the source, adding that the company had been seeking to restructure some payments.
Standard Bank declined to comment, citing client confidentiality, while Standard Chartered and Bank of China did not respond to requests for comment.
Sonangol's direct debt to Chinese banks and lending consortia including Chinese banks stood at $3.8 billion at the end of 2016, according to the company's annual report.
Oil industry sources told Reuters this debt now stood at about $3 billion, plus another $3 billion to majors, contractors and traders. Of that, nearly $1 billion is owed to trading firms Trafigura and Vitol under loans guaranteed by oil or product exports, according to a source close to Sonangol.
The government itself also last year took out a further $6.9 billion loan from the China Development Bank that it lent to Sonangol, $3.8 billion of which the firm used to refinance debt, according to an International Monetary Fund report.
Supporters of dos Santos, who are familiar with her work at Sonangol, said the debts dated back to before her tenure. They said the company was now in better financial state. The slow pace of restructuring, they say, was due to the scale of the job and restraints imposed by the state on selling assets.
Her dismissal, according to them, was purely political and part of a campaign by the president against her family.
With consensus in government building fast against dos Santos, she responded with a charm offensive.
In London, she met CEOs of major oil companies at an industry conference. On Oct. 18, she did a rare live interview at the Reuters office in the city's Canary Wharf financial district.
In the Reuters interview, she described her relationship with the new president as one of "full alignment". But she gave a hint that her days at Sonangol may be numbered, when asked if she would stay to see through the transformation of the firm.
"Once the foundations have been laid and are right, it doesn't matter who steps in as long as the plan is good," said dos Santos, who has stakes in businesses from telecoms to diamonds.
The charm offensive was too little, too late.
On Nov. 15, dos Santos and most of her board were sacked. She was replaced by the man that had become her nemesis: Saturnino.
Foundations notwithstanding, the new management faces the tasks of getting projects moving again, repaying billions of dollars owed to oil majors, contractors and traders, and servicing billions more dollars of debt owed to Chinese banks.
An executive at Sonangol said a massive round of lay-offs had been delayed until after the election and the task would also now most likely fall to the new team.
Lourenço, however, appeared confident of Sonangol's potential when he attended the board's inauguration, describing the company as a "golden goose".
"Take good care of her," he said. (Writing by Stephen Eisenhammer; Editing by Pravin Char)