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  <xs:element id="ois_ShortCycleOtherProductsMember" abstract="true" name="ShortCycleOtherProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_A15ConvertibleUnsecuredSeniorNotesDueFebruary2023Member" abstract="true" name="A15ConvertibleUnsecuredSeniorNotesDueFebruary2023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentIntercompanyAdvances" abstract="false" name="OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentIntercompanyAdvances" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestAtOneYearPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestAtOneYearPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ois_DownholeTechnologiesMember" abstract="true" name="DownholeTechnologiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_RevenueRemainingPerformanceObligationPercentageRemainingInYearTwoAndThereafter" abstract="false" name="RevenueRemainingPerformanceObligationPercentageRemainingInYearTwoAndThereafter" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_ExchangeRateStrengthenedWeakened" abstract="false" name="ExchangeRateStrengthenedWeakened" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_FinishedGoodsAndPurchasedProducts" abstract="false" name="FinishedGoodsAndPurchasedProducts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ShortCycleCompletionProductsandServicesMember" abstract="true" name="ShortCycleCompletionProductsandServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_A475ConvertibleSeniorNotesDue2026Member" abstract="true" name="A475ConvertibleSeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriod" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ois_DebtInstrumentCovenantPercentageOfBorrowingBaseOutstanding" abstract="false" name="DebtInstrumentCovenantPercentageOfBorrowingBaseOutstanding" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_DebtInstrumentCovenantMinimumFixedChargeCoverageRatio" abstract="false" name="DebtInstrumentCovenantMinimumFixedChargeCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="ois_DebtInstrumentSpringingMaturitySubjectToAmountOfIndebtednessInExcess" abstract="false" name="DebtInstrumentSpringingMaturitySubjectToAmountOfIndebtednessInExcess" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ServiceBasedStockUnitsMember" abstract="true" name="ServiceBasedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_DeferredCompensationArrangementWithIndividualPotentialLiability" abstract="false" name="DeferredCompensationArrangementWithIndividualPotentialLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ContractWithCustomerLiabilityIncreaseDueToBillings" abstract="false" name="ContractWithCustomerLiabilityIncreaseDueToBillings" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ContractWithCustomerAssetDecreaseDueToRevenueRecognized" abstract="false" name="ContractWithCustomerAssetDecreaseDueToRevenueRecognized" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_DetailsofSelectedBalanceSheetAccountsAbstract" abstract="true" name="DetailsofSelectedBalanceSheetAccountsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="ois_PerformanceBasedStockUnitsAndServiceBasedStockUnitsMember" abstract="true" name="PerformanceBasedStockUnitsAndServiceBasedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_TotalWellSiteServicesMember" abstract="true" name="TotalWellSiteServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_AccountsReceivableAllowanceForCreditLossPercentageOfTotalAccountsReceivable" abstract="false" name="AccountsReceivableAllowanceForCreditLossPercentageOfTotalAccountsReceivable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_IncomeAttributableToUnvestedRestrictedStockAwards" abstract="false" name="IncomeAttributableToUnvestedRestrictedStockAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_RevenueRemainingPerformanceObligationPercentageRemainingFiscalYear" abstract="false" name="RevenueRemainingPerformanceObligationPercentageRemainingFiscalYear" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_AccountsReceivableAllowanceForCreditLossOther" abstract="false" name="AccountsReceivableAllowanceForCreditLossOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_DebtInstrumentCovenantAmountOfBorrowingBaseOutstanding" abstract="false" name="DebtInstrumentCovenantAmountOfBorrowingBaseOutstanding" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_WeightedAverageNumberOfCommonSharesOutstanding" abstract="false" name="WeightedAverageNumberOfCommonSharesOutstanding" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="ois_DebtInstrumentSpringingMaturityTerm" abstract="false" name="DebtInstrumentSpringingMaturityTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ois_DeferredCompensationArrangementWithIndividualRequisitePerformancePeriod" abstract="false" name="DeferredCompensationArrangementWithIndividualRequisitePerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="ois_ProjectDrivenProductsMember" abstract="true" name="ProjectDrivenProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_UnbilledRevenueMember" abstract="true" name="UnbilledRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_FinanceLeaseObligationsAndOtherDebtMember" abstract="true" name="FinanceLeaseObligationsAndOtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_ShortCycleProductsMember" abstract="true" name="ShortCycleProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_ProceedsFromRepaymentsOfFinanceLeaseObligationsAndOtherDebt" abstract="false" name="ProceedsFromRepaymentsOfFinanceLeaseObligationsAndOtherDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_RevenuefromContractwithCustomerPercentageofRevenue" abstract="false" name="RevenuefromContractwithCustomerPercentageofRevenue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentExcludingIntercompanyAdvances" abstract="false" name="OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParentExcludingIntercompanyAdvances" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_ContractAssetReceivablesMember" abstract="true" name="ContractAssetReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_PatentsTechnologyBasedandKnowhowMember" abstract="true" name="PatentsTechnologyBasedandKnowhowMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_ServiceBasedRestrictedStockMember" abstract="true" name="ServiceBasedRestrictedStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_ShortCycleDrillingServicesMember" abstract="true" name="ShortCycleDrillingServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_OffshoreManufacturedProductsMember" abstract="true" name="OffshoreManufacturedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_DebtInstrumentPrincipalAmountRepurchased" abstract="false" name="DebtInstrumentPrincipalAmountRepurchased" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="ois_OtherReceivablesMember" abstract="true" name="OtherReceivablesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ois_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalPerformanceBasedSharesToBeIssuedIfCurrentPeriodMetricsAchievedMaximumTargetAwardPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalPerformanceBasedSharesToBeIssuedIfCurrentPeriodMetricsAchievedMaximumTargetAwardPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="ois_OtherProductsAndServicesMember" abstract="true" name="OtherProductsAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
