In QGIS 3 you can add the map as "XYZ Tiles" Layer using the following URL:

https://tiles.arcgis.com/tiles/ULBqC49IEeIR01GF/arcgis/rest/services/Middle_East_Oil_and_Gas_Field_Map_by_CIA/MapServer/WMTS/tile/1.0.0/Middle_East_Oil_and_Gas_Field_Map_by_CIA/default/default028mm/{z}/{y}/{x}.png

(notice the variables at the end)

You can add the map as "XYZ Tiles" layer using the following URL:

https://tiles.arcgis.com/tiles/ULBqC49IEeIR01GF/arcgis/rest/services/Middle_East_Oil_and_Gas_Field_Map_by_CIA/MapServer/WMTS/tile/1.0.0/Middle_East_Oil_and_Gas_Field_Map_by_CIA/default/default028mm/{z}/{y}/{x}.png

Notice the variables {z}, {y}, {x} at the end.

I checked it using QGIS 3.4, but should also work with 2.18. See this video.