After July 24, Joyner will be replaced by John Li as interim CFO until a replacement is appointed, the company also said.

Tony Hayward, who was Genel's CEO until 2015 and is also the chairman of Glencore, will not receive any severance package beyond his salary, a company spokesman said, Reuters reported.

Russ Ford currently serves on the board of directors at Pacific Exploration & Production Corp., and Robert Rice currently is the COO of Archrock Inc.

The company did not give a reason for the changes, which come ten months after Yang Hua was promoted to CEO and Yuan Guangyu was named president, Reuters said.

Brooks has more than 34 years of experience in the energy industry, most recently as CEO for Yates Petroleum which merged with EOG Resources in October.

Jack Stark's title is set to change to president when Maranto joins May 1. Stark has served as president and COO of Continental since 2014 and has been with the company since 1992.

Painter, whose resignation is effective April 30, had only held his current position since January. He previously served as Cobalt's executive vice president of the Gulf of Mexico from the company's inception in 2005.

Compensation for three of Chevron Corp.'s senior leaders, including CEO John Watson, rose last year due to a change in how the value of pensions are calculated.

Oilfield services company Hunting Plc said its CEO Dennis Proctor will retire later this year after a successor has been appointed.

UTEC, a survey company in subsea services group Acteon, has brought aboard Stuart Cameron as CEO, following the retirement of Martin O’Carroll, who co-founded UTEC in 2005.

Many of the technologies used in drilling will last well into the future, and it could be at least 30 years before oil is simply too expensive to extract. Experts discussed what might change.

Genel Energy is set to lose its finance chief, Ben Monaghan, while still struggling to find a replacement for Chairman Tony Hayward, sources told Reuters.