Saudi Energy Minister Khalid al-Falih said Riyadh held "frank and friendly" discussions with oil exporters about cutting oil production as promised.

Saudi Energy Minister Khalid al-Falih urged better delivery from OPEC and 11 other oil producing nations that have vowed to reduce their oil supply.

"It's a learning process for some countries and we want them to accelerate that learning and get on board fully," he told CNBC in a Thursday interview.

Saudi Arabia has been providing the lion's share of the 1.2 million barrels a day the Organization of the Petroleum Exporting Countries committed to removing from the market in November.

In its latest monthly report, OPEC cited secondary sources showing only the kingdom and Angola had cut more than promised in the second month of the deal. Four other producers came above their quotas in February, while Iraq and the United Arab Emirates remain well above their targets.

At the same time, non-OPEC producers have fallen short of cutting 558,000 barrels a day, a level they agreed to in December. Russia, the largest contributor, delivered about a third of its cuts in the first two months of the deal.