Class action lawsuits like the ones BP is facing in the U.S. are a "business model" that serves only to benefit attorneys, the chief executive of BP told CNBC.
"The biggest beneficiaries that I can see broadly are plaintiffs' attorneys themselves, who are not just collecting fees on behalf of claims that have been submitted but also their own firms which are submitting large claims," Bob Dudley said on Tuesday.
His comments came on the day BP said its $20 billion oil spill compensation fund has almost run out, after provision for costs leaped by $1.4 billion in the second quarter.
The British oil company has just $300 million left in the fund, and the deadline to file an economic loss claim among Gulf coast businesses - which make up the bulk of claims - is not until April next year.
BP has said claims beyond what the fund can pay will be taken straight out of future profits. The company has also increased its overall provision for the Gulf of Mexico oil spill to $42.4 billion from $42.2 billion.
Dudley said BP had no problems with paying for "legitimate" claims but that the agreement with the U.S.Department of Justice that allowed people to claim for compensation was being mis-interpreted.
"This is not right, it's not good for American business... that's why we're vigorously protesting it. It happens all the time in the U.S. with this class action plaintiff system which is an industry and a business model."
The oil major is locked in a legal battle over compensation payouts with the administrator Patrick Juneau. It says Juneau is paying out "fictitious" claims due to a misinterpretation of the settlement.
BP also faces a resumption of its trial on civil charges in September.
The company reported second quarter earnings on Tuesday, which missed expectations.
(Read more: US energy production growing by leaps and bounds: BP )
Adjusted net profit came in at $2.712 billion compared with expectations of $3.410 billion and $3.6 billion a year ago.
Of the extra $1.4 billion of spill costs - which come on top of a $500 million cost in the first half - some $900 million is for extra claims, while about $500 million is for the costs of the claims administrator.
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