Finance Minister Anas al-Saleh was appointed as acting oil minister, in decrees cited by the official KUNA news agency.
The decrees also announced accepting the resignation of Ahmad al-Jassar, who held the portfolios of electricity and water and public works.
Jassar resigned in September after being sentenced to two years in jail for wrongly approving a USD 215 million contract that inflicted heavy losses on the state.
State Minister for Cabinet Affairs Sheikh Mohammad Abdullah Al-Sabah was appointed as acting minister of electricity and water.
At the start of November, the CEO of state-owned Kuwait Petroleum Corp, Nezar al-Adasani, refused to carry out the oil minister's decision to swap the CEOs of two subsidiaries.
Adasani said in a letter that the minister had no power to make the decision and the two officials also rejected the minister's order.
Kuwait is pumping around 2.8 million barrels per day and sits on around 7.0 per cent of world reserves, according to latest data.
The 16-member Kuwaiti cabinet was formed after a July 2013 general election.
