#oil_well__oilwell  a well that yields or has yielded oil
  supertype:  #well  a deep hole or shaft dug or drilled to obtain water or oil or gas or brine
  subtype:  #gusher  an oil well with a strong natural flow so that pumping is not necessary
  subtype:  #spouter.oil_well  an oil well that is spouting
  subtype:  #wildcat_well__wildcatwell__wildcat  an exploratory oil well drilled in land not known to be an oil field

No statement uses or specializes #oil_well; click here to add one.