Associated petroleum gas (APG), kapena mpweya womwe umayenderana nawo, ndi mtundu wa mpweya wachilengedwe womwe umapezeka ndi mafuta, osungunuka mu mafutawo kapena ngati "kapu yamafuta" yaulere pamwamba pamafuta mosungira. Gasiyo itha kugwiritsidwa ntchito m'njira zingapo ikakonzedwa: kugulitsidwa ndikuphatikizidwa pamaukonde amagetsi omwe amagwiritsidwa ntchito popanga magetsi pamalo pomwe pali ma injini kapena ma turbines, obwezeretsedwanso kuchira kwachiwiri ndikugwiritsidwanso ntchito pokonzanso mafuta, osinthidwa kuchokera ku gasi kwa zamadzimadzi zopangira utsi wopangira, kapena kugwiritsidwa ntchito ngati chakudya chazogulitsa zamafuta.