Pump jacks operate at sunset in Midland, Texas, U.S., February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

Pump jacks operate at sunset in Midland, Texas, U.S., February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

Drilling rigs operate at sunset in Midland, Texas, U.S., February 13, 2019. Picture taken February 13, 2019. REUTERS/Nick Oxford

A steer grazes in an oil production field in Midland, Texas U.S. February 13, 2019. Picture taken February 13, 2019. REUTERS/Nick Oxford

Cows graze in an oil production field in Midland, Texas U.S. February 13, 2019. Picture taken February 13, 2019.REUTERS/Nick Oxford

Pump jacks operate at sunset in Midland, Texas U.S. February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

A pump jack operates at sunset in Midland, Texas U.S. February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

A pump jack operates at sunset in Midland, Texas U.S. February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

Pump jacks operate at sunset in Midland, Texas U.S. February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

Pump jacks operate at sunset in Midland, Texas U.S. February 11, 2019. Picture taken February 11, 2019. REUTERS/Nick Oxford

The sun sets behind an oil pump outside Saint-Fiacre, near Paris, France March 28, 2019. REUTERS/Christian Hartmann

An oil pumpjack painted with the colors of the Venezuelan flag is seen in Lagunillas, Venezuela January 29, 2019. REUTERS/Isaac Urrutia

An oil pumpjack and a tank with the corporate logo of state oil company PDVSA are seen in an oil facility in Lagunillas, Venezuela January 29, 2019. REUTERS/Isaac Urrutia

An oil pumpjack is seen in Lagunillas, Venezuela January 29, 2019. REUTERS/Isaac Urrutia

Oil pumpjacks are seen in Lagunillas, Venezuela January 29, 2019. REUTERS/Isaac Urrutia

A pumpjack is shown outside a hospital in Seminole, Texas, U.S., July 18, 2018. Image taken July 18, 2018. REUTERS/Liz Hampton

A pumpjack is shown outside Midland-Odessa area in the Permian basin in Texas, U.S., July 17, 2018. Image taken July 17, 2018. REUTERS/Liz Hampton

A pumpjack is shown outside Midland-Odessa area in the Permian basin in Texas, U.S., July 17, 2018. Image taken July 17, 2018. REUTERS/Liz Hampton

A pumpjack is seen at the Sinopec-operated Shengli oil field in Dongying, Shandong province, China January 12, 2017. Picture taken January 12, 2017. REUTERS/Chen Aizhu

A pump jack operates at sunset in an oil field in Midland, Texas U.S. August 22, 2018. Picture taken August 22, 2018. REUTERS/Nick Oxford

Pump jacks operate at sunset in an oil field in Midland, Texas U.S. August 22, 2018. Picture taken August 22, 2018. REUTERS/Nick Oxford

Pump jacks operate at sunset in an oil field in Midland, Texas U.S. August 22, 2018. Picture taken August 22, 2018. REUTERS/Nick Oxford

A pump jack operates in front of a drilling rig at sunset in an oil field in Midland, Texas U.S. August 22, 2018. Picture taken August 22, 2018. REUTERS/Nick Oxford

Oil facilities are seen on Lake Maracaibo in Lagunillas, Venezuela May 24, 2018. Picture taken May 24, 2018. REUTERS/Isaac Urrutia

An oil pumpjack is seen at Lake Maracaibo in Lagunillas, Venezuela May 24, 2018. Picture taken May 24, 2018. REUTERS/Isaac Urrutia

Oil facilities are seen on Lake Maracaibo in Lagunillas, Venezuela May 24, 2018. Picture taken May 24, 2018. REUTERS/Isaac Urrutia

Oil pumpjacks are seen in Lagunillas, Venezuela May 24, 2018. Picture taken May 24, 2018. REUTERS/Isaac Urrutia

Oil pumpjacks are seen in Lagunillas, Venezuela May 24, 2018. Picture taken May 24, 2018. REUTERS/Isaac Urrutia

Oil pumpjacks are seen near Aneth, Utah, U.S., October 29, 2017. REUTERS/Andrew Cullen SEARCH "CULLEN BEARS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.

An oil pumpjack operates in the drive-thru area of a McDonald's in Bradford, Pennsylvania, U.S. October 6, 2017. REUTERS/Brendan McDermid

An oil pumpjack operates in the drive-thru area of a McDonald's in Bradford, Pennsylvania, U.S. October 6, 2017. REUTERS/Brendan McDermid

An oil pumpjack operates in the drive-thru area of a McDonald's in Bradford, Pennsylvania, U.S. October 6, 2017. REUTERS/Brendan McDermid

Pumpjacks are seen at Lake Maracaibo in Cabimas, Venezuela October 5, 2017. Picture taken October 5, 2017. REUTERS/Isaac Urrutia

Pumpjacks are seen in Lagunillas, Venezuela October 5, 2017. Picture taken October 5, 2017. REUTERS/Isaac Urrutia

A car drives past a pumpjack in Lagunillas, Venezuela October 5, 2017. Picture taken October 5, 2017. REUTERS/Isaac Urrutia

A rainbow is seen over a pumpjack during sunset outside Scheibenhard, near Strasbourg, France, October 6, 2017. REUTERS/Christian Hartmann

A rainbow is seen over a pumpjack during sunset outside Scheibenhard, near Strasbourg, France, October 6, 2017. REUTERS/Christian Hartmann

A pumpjack is seen behind a vineyard near Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A painted pumpjack is is placed for decoration inside a roundabout in Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A pumpjack is seen near Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

Pumpjacks are seen near Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A pumpjack is seen behind a vineyard near Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A pumpjack is seen near Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A painted pumpjack is placed as a decoration inside a roundabout in Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A painted pumpjack is placed as a decoration inside a roundabout in Zistersdorf, Austria, October 2, 2017. REUTERS/Heinz-Peter Bader

A pump jack is seen at sunset near Midland, Texas, U.S., on May 3, 2017. Picture taken May 3, 2017. REUTERS/Ernest Scheyder

An oil pump is seen operating in the Permian Basin near Midland, Texas, U.S. on May 3, 2017. Picture taken May 3, 2017. REUTERS/Ernest Scheyder

FILE PHOTO: An oil pump jack pumps oil in a field near Calgary, Alberta, Canada on July 21, 2014. REUTERS/Todd Korol/File Photo

A view shows an oil well pump jack, set as an installation in front of the Tengizchevroil LLP office in the city of Atyrau, western Kazakhstan, December 7, 2016. REUTERS/Maria Gordiyeva

A car drives past an oil well pump jack, set as an installation in front of the Tengizchevroil LLP office in the city of Atyrau, western Kazakhstan, December 7, 2016. REUTERS/Maria Gordiyeva

A pump jack is seen at sunrise near Bakersfield, California October 14, 2014. REUTERS/Lucy Nicholson/File Photo

Pumpjacks taken out of production temporarily stand idle at a Hess site while new wells are fracked near Williston, North Dakota November 12, 2014. REUTERS/Andrew Cullen/File Photo GLOBAL BUSINESS WEEK AHEAD PACKAGE - SEARCH 'BUSINESS WEEK AHEAD 24 OCT' FOR ALL IMAGES

A worker at an oil field owned by Bashneft, Bashkortostan, Russia, January 28, 2015. REUTERS/Sergei Karpukhin/File Photo

View of a pump jack at the engineering school of Venezuela Central University in Caracas, Venezuela August 10, 2016. Picture taken August 10, 2016. REUTERS/Marco Bello

A pumpjack brings oil to the surface in the Monterey Shale, California, U.S. April 29, 2013. REUTERS/Lucy Nicholson/File Photo

Eighteen oil pumpjacks are seen on a Hess well pad near Tioga, North Dakota April 30, 2016. To match Special Report USA-NORTH DAKOTA/BUST REUTERS/Andrew Cullen/File Photo

An oil pumpjack is seen in Velma, Oklahoma U.S. April 7, 2016. REUTERS/Luc Cohen

Pump jacks are seen at the Lukoil-owned Imilorskoye oil field, as the sun sets, outside the west Siberian city of Kogalym, Russia, in this January 25, 2016 file photo. To match Exclusive RUSSIA-OPEC/FREEZE REUTERS/Sergei Karpukhin/Files

Pumpjacks and other infrastructure for producing oil dot fields outside of Watford City, North Dakota January 21, 2016. Over the last year, continually decreasing oil prices have forced a decrease in drilling and fracking new wells in North Dakota's Bakken shale play. The collapse of U.S. oil and gas investment could have further to fall and Americans are showing signs they spend less of their windfall from lower gasoline prices than in the past, darkening the outlook for the U.S. economy. REUTERS/Andrew Cullen

A pump jack operates at a well site leased by Devon Energy Production Company near Guthrie, Oklahoma September 15, 2015. Picture taken September 15, 2015. REUTERS/Nick Oxford