Aug 6 (Reuters) - Oil and gas producer ConocoPhillips ( COP ) said on Thursday Chief Executive Ryan Lance will retire after leading the oil producer for 14 years, with Chief Financial Officer Andy O'Brien set to take over as CEO on September 1.

Lance took the helm of the company in 2012 after ConocoPhillips ( COP ) split from refining business Phillips 66, leaving it as a pure exploration and production company.

Konnie Haynes-Welsh, currently vice president, finance and controller, will become senior vice president and chief financial officer.

Separately, the company posted an adjusted profit of $3.24 per share for the quarter ended June 30, compared with analysts' average estimate of $2.88 per share, according to data compiled by LSEG.

(Reporting by Pooja Menon in Bengaluru; Editing by Shinjini Ganguli)