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  <xs:element id="rei_InsuranceCompanyTwoMember" abstract="true" name="InsuranceCompanyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_FederalAgenciesMember" abstract="true" name="FederalAgenciesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_InsuranceCompanyMember" abstract="true" name="InsuranceCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_SuretyBondsValue" abstract="false" name="SuretyBondsValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rei_ExpenseRelatingToSuretyBondsPaid" abstract="false" name="ExpenseRelatingToSuretyBondsPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rei_AmountsDrawnUnderTheStandbyLettersOfCredit" abstract="false" name="AmountsDrawnUnderTheStandbyLettersOfCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rei_ReportableSegmentMember" abstract="true" name="ReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_OperatingLeaseWorkoverExpense" abstract="false" name="OperatingLeaseWorkoverExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rei_OperatingLeaseOtherExpense" abstract="false" name="OperatingLeaseOtherExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rei_Phillips66CompanyMember" abstract="true" name="Phillips66CompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_ConcordEnergyLLCMember" abstract="true" name="ConcordEnergyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_NGLCrudePartnersMember" abstract="true" name="NGLCrudePartnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rei_EnergyTransferCrudeMarketingMember" abstract="true" name="EnergyTransferCrudeMarketingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
