Petrofac said an internal investigation into its board related to historical provision of services to company by Unaoil has found no wrongdoing of any director.
In a statement the firm said no evidence was found that directors were aware of alleged misconduct.
The company confirmed between 2002 and 2009 it did work with Unaoil for the provision of local consultancy services primarily in Kazakhstan.
No evidence was found in the independent investigation confirming any payment of bribes.
The investigation was carried out by Freshfields Bruckhaus Deringer with the support of forensic accountants from KPMG.
The findings will now be shared with the Serious Fraud Office (SFO) and other relevant authorities.
A spokesman added: “Petrofac enforces strict anti-bribery and corruption standards and a compliance programme focused on training, monitoring, risk management and due diligence.
“The programme mandates compliance with all anti-bribery and corruption and anti-money laundering laws, rules and regulations.”
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