Futures in New York dropped below $41 a barrel, though the more global Brent benchmark's structure firmed on signs of tightness in physical markets.
Brent crude futures settled at $43.08 a barrel, down 2 cents in the session. US West Texas Intermediate settled down 1 cent at $40.62 a barrel.
The Organization of Petroleum Exporting Countries cut production by 1.93 million barrels a day to 22.69 million a day last month, according to the survey.
OPEC+ have agreed to cut production by a record 9.7 million barrels per day
Crude stocks rose by 5.7 million barrels in the week to June 5 to 538.1 million barrels, according to a report from the USEnergy Information Administration.
The speed at which the oil market rebounded to $40 per barrel has certainly grabbed attention, but it needs to walk before it can run
The group, known as OPEC+, agreed on Saturday to sustain those cuts, equal to about 10% of global supply, through July
OPEC+ had initially agreed in April that it would cut supply by 9.7 million barrels per day (bpd) during May-June to prop up prices that collapsed due to the coronavirus crisis.
An extension to cuts was contingent on high compliance, three Opec sources told Reuters
The crash in futures may not benefit India
Chances of huge defaults by investors, many of whom are retail traders gone long; On Nymex, there were actual trades in minus in which sellers were actually paying buyers to lift stocks
The Bank did not elaborate the extent of its exposure and the steps it is taking to protect its interest
They're running out of storage space on land and their refineries are running only at 50% of capacity; US Oil futures touch an unprecedented negative pricing
The OPEC+ alliance, led by Riyadh and Moscow, agreed on Sunday to slash daily production by 9.7 million bpd over the next two months
The meeting between Opec producers and allies was held on Sunday via videoconference in a last effort to establish a deal
The slash is about 10% of global supply
Even more countries, including the US, were discussing Friday their own cuts in what would be an unprecedented global pact to stabilise the market.
The cartel, Kuwait and Saudi Arabia say Mexico's refusal to agree blocked the proposed accord
The oil market was dealt a heavy blow by the freefall in demand due to the coronavirus pandemic
The two nations are meeting next week to work out a possible output cut