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  <xs:element id="pr_SharesRepurchasedDuringPeriodAveragePricePerShare" abstract="false" name="SharesRepurchasedDuringPeriodAveragePricePerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="pr_NaturalGasAndNaturalGasLiquidsMember" abstract="true" name="NaturalGasAndNaturalGasLiquidsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pr_ContractWithCustomerBillingCycle" abstract="false" name="ContractWithCustomerBillingCycle" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pr_COPBoltOnAcquisitionMember" abstract="true" name="COPBoltOnAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pr_COPBoltOnAcquisitionLeaseholdAcresMember" abstract="true" name="COPBoltOnAcquisitionLeaseholdAcresMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pr_COPBoltOnAcquisitionRoyaltyAcresMember" abstract="true" name="COPBoltOnAcquisitionRoyaltyAcresMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
