<?xml version="1.0" encoding="us-ascii"?>
<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2020-07-27T22:09:03.7075474+00:00 -->
<!-- Version            : 5.0.1.476 -->
<!-- Package ID         : 611c0fe98196475193be4e25ffce1123 -->
<!-- Copyright (c) 2020 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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        <link:definition>100400 - Disclosure - Revenues - Additional Information (Detail)</link:definition>
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        <link:definition>100410 - Disclosure - Inventory (Detail)</link:definition>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosurePropertyAndEquipmentDetail" id="Role_DisclosurePropertyAndEquipmentDetail">
        <link:definition>100420 - Disclosure - Property and Equipment (Detail)</link:definition>
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        <link:definition>100430 - Disclosure - Property and Equipment - Additional Information (Detail)</link:definition>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureGoodwillByOperatingSegmentDetail" id="Role_DisclosureGoodwillByOperatingSegmentDetail">
        <link:definition>100440 - Disclosure - Goodwill by Operating Segment (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>100450 - Disclosure - Goodwill and Intangible Assets - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100460 - Disclosure - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureSummaryOfAccruedLiabilitiesDetail" id="Role_DisclosureSummaryOfAccruedLiabilitiesDetail">
        <link:definition>100470 - Disclosure - Summary of Accrued Liabilities (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureLongTermDebtTermLoanAgreementAdditionalInformationDetail" id="Role_DisclosureLongTermDebtTermLoanAgreementAdditionalInformationDetail">
        <link:definition>100480 - Disclosure - Long Term Debt - Term Loan Agreement - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureLongTermDebtCreditFacilitiesAdditionalInformationDetail" id="Role_DisclosureLongTermDebtCreditFacilitiesAdditionalInformationDetail">
        <link:definition>100490 - Disclosure - Long Term Debt - Credit Facilities - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureLongTermDebtSeniorNotesAdditionalInformationDetail" id="Role_DisclosureLongTermDebtSeniorNotesAdditionalInformationDetail">
        <link:definition>100500 - Disclosure - Long Term Debt - Senior Notes - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureScheduleOfPrincipalRepaymentRequirementsOfLongTermDebtDetail" id="Role_DisclosureScheduleOfPrincipalRepaymentRequirementsOfLongTermDebtDetail">
        <link:definition>100510 - Disclosure - Schedule of Principal Repayment Requirements of Long-Term Debt (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail" id="Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail">
        <link:definition>100520 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetail" id="Role_DisclosureStockholdersEquityAdditionalInformationDetail">
        <link:definition>100530 - Disclosure - Stockholders&apos; Equity - Additional Information (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureCashDividendsDetail" id="Role_DisclosureCashDividendsDetail">
        <link:definition>100540 - Disclosure - Cash Dividends (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureTreasuryStockAcquisitionDetail" id="Role_DisclosureTreasuryStockAcquisitionDetail">
        <link:definition>100550 - Disclosure - Treasury Stock Acquisition (Detail)</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>100560 - Disclosure - Stockholders&apos; Equity - Schedule of Reconciliation of Changes in Stockholders&apos; Equity (Detail)</link:definition>
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        <link:definition>100570 - Disclosure - Stock-based Compensation - Additional Information (Detail)</link:definition>
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      <link:roleType roleURI="http://www.patenergy.com/20200630/taxonomy/role/DisclosureStockOptionActivityDetail" id="Role_DisclosureStockOptionActivityDetail">
        <link:definition>100580 - Disclosure - Stock Option Activity (Detail)</link:definition>
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        <link:definition>100590 - Disclosure - Restricted Stock Activity (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100600 - Disclosure - Restricted Stock Unit Activity (Detail)</link:definition>
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        <link:definition>100610 - Disclosure - Performance Units (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100620 - Disclosure - Fair Value of Performance Units (Detail)</link:definition>
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        <link:definition>100630 - Disclosure - Compensation Expense Associated with Performance Units (Detail)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>100640 - Disclosure - Income Taxes - Additional Information (Detail)</link:definition>
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        <link:definition>100650 - Disclosure - Earnings Per Share - Calculation of Basic and Diluted Net Loss per Share (Detail)</link:definition>
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        <link:definition>100660 - Disclosure - Business Segments - Additional Information (Detail)</link:definition>
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        <link:definition>100670 - Disclosure - Business Segments - Revenues (Detail)</link:definition>
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        <link:definition>100680 - Disclosure - Business Segments - Income (Loss) Before Income Taxes (Detail)</link:definition>
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        <link:definition>100700 - Disclosure - Business Segments - Capital Expenditures (Detail)</link:definition>
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        <link:definition>100710 - Disclosure - Business Segments - Identifiable Assets (Detail)</link:definition>
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        <link:definition>100720 - Disclosure - Estimated Fair Value of Outstanding Debt Balances (Detail)</link:definition>
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  <xsd:element id="pten_OilfieldRentalsMember" name="OilfieldRentalsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_PercentageOfExceptedCashFlowsOnUndiscountedBasisExceedingCarryingValuesOfLongLivedAssets" name="PercentageOfExceptedCashFlowsOnUndiscountedBasisExceedingCarryingValuesOfLongLivedAssets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_GoodwillAndIntangibleAssetsDisclosureLineItems" name="GoodwillAndIntangibleAssetsDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_GoodwillAndIntangibleAssetsDisclosureTable" name="GoodwillAndIntangibleAssetsDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_AccruedSalariesWagesPayrollTaxesAndBenefitsCurrent" name="AccruedSalariesWagesPayrollTaxesAndBenefitsCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pten_AccruedRestructuringExpenseCurrent" name="AccruedRestructuringExpenseCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pten_TermLoanAgreementMember" name="TermLoanAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_SubjectToCustomaryConditionsMember" name="SubjectToCustomaryConditionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_LineOfCreditFacilityAdditionalBorrowingCapacity" name="LineOfCreditFacilityAdditionalBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pten_DebtServiceCoverageRatio" name="DebtServiceCoverageRatio" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_PercentageOfNetCashProceedsFromIssuanceOfNewSeniorIndebtedness" name="PercentageOfNetCashProceedsFromIssuanceOfNewSeniorIndebtedness" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_ConsolidatedDebtAsPercentageOfCapitalization" name="ConsolidatedDebtAsPercentageOfCapitalization" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_CreditAgreementMember" name="CreditAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_SwingLineFacilityMember" name="SwingLineFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ReimbursementAgreementMember" name="ReimbursementAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_DebtInstrumentNumberOfOptionalExtensionsToInitialMaturityDate" name="DebtInstrumentNumberOfOptionalExtensionsToInitialMaturityDate" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_DebtInstrumentInitialMaturityDateOptionalExtensionPeriod" name="DebtInstrumentInitialMaturityDateOptionalExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_DebtInstrumentPrincipleIncludingMakeWholePremium" name="DebtInstrumentPrincipleIncludingMakeWholePremium" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="pten_SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember" name="SeriesASeniorNotesFourPointNineSevenPercentDueOctoberFiveTwentyTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember" name="SeriesBSeniorNotesFourPointTwoSevenPercentDueJuneFourteenTwentyTwentyTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ThreePointNineFivePercentSeniorNotesDueJanuaryTwoThousandTwentyEightMember" name="ThreePointNineFivePercentSeniorNotesDueJanuaryTwoThousandTwentyEightMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_FivePointOneFivePercentSeniorNotesDueNovemberTwoThousandTwentyNineMember" name="FivePointOneFivePercentSeniorNotesDueNovemberTwoThousandTwentyNineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_DebtInstrumentRedemptionPricePercentageOnChangeOfControlDescription" name="DebtInstrumentRedemptionPricePercentageOnChangeOfControlDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_DebtInstrumentRedemptionPricePercentageOnChangeOfControl" name="DebtInstrumentRedemptionPricePercentageOnChangeOfControl" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_DepositRevaluationCharge" name="DepositRevaluationCharge" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="pten_AgreementExpireDescription" name="AgreementExpireDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_ReservationAgreementAmount" name="ReservationAgreementAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="pten_PreferredStockExercisePricePerRight" name="PreferredStockExercisePricePerRight" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_StockRepurchasePlanMember" name="StockRepurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_PercentageOfBeneficialOwnershipRequiredToExerciseRightUnderRightsAgreementDescription" name="PercentageOfBeneficialOwnershipRequiredToExerciseRightUnderRightsAgreementDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_PercentageOfAcquisitionInMergerOrOtherUnapprovedPartyDescription" name="PercentageOfAcquisitionInMergerOrOtherUnapprovedPartyDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_PercentageOfBeneficialOwnershipNotExercisablePriorToAdoptionOfRightAgreementDescription" name="PercentageOfBeneficialOwnershipNotExercisablePriorToAdoptionOfRightAgreementDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_PercentageOfDiscountOnPurchaseOfAdditionalShareInRightAgreement" name="PercentageOfDiscountOnPurchaseOfAdditionalShareInRightAgreement" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_PercentageOfDiscountOnShareAcquisitionInMergerOrOtherUnapprovedParty" name="PercentageOfDiscountOnShareAcquisitionInMergerOrOtherUnapprovedParty" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_RedemptionPriceOfRights" name="RedemptionPriceOfRights" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="pten_ExpirePeriodOfRightAgreement" name="ExpirePeriodOfRightAgreement" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_InstallmentOneFiscalYearTwoThousandTwentyMember" name="InstallmentOneFiscalYearTwoThousandTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_InstallmentTwoFiscalYearTwoThousandTwentyMember" name="InstallmentTwoFiscalYearTwoThousandTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_InstallmentOneFiscalYearTwoThousandNineteenMember" name="InstallmentOneFiscalYearTwoThousandNineteenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_InstallmentTwoFiscalYearTwoThousandNineteenMember" name="InstallmentTwoFiscalYearTwoThousandNineteenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_StockRepurchaseProgramIncreaseDecreaseInAuthorizedAmount" name="StockRepurchaseProgramIncreaseDecreaseInAuthorizedAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="pten_LongTermIncentivePlanMember" name="LongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ConditionOneMember" name="ConditionOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_YearTwentySixteenMember" name="YearTwentySixteenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ChiefExecutiveOfficerAndPresidentMember" name="ChiefExecutiveOfficerAndPresidentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_TimeBasedRestrictedStockUnitsMember" name="TimeBasedRestrictedStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_PerformanceBasedRestrictedStockUnitsMember" name="PerformanceBasedRestrictedStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_StockIssuedDuringPeriodSharesIssuedForSettlement" name="StockIssuedDuringPeriodSharesIssuedForSettlement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_PerformanceAwardTargetNumberOfShares" name="PerformanceAwardTargetNumberOfShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_YearTwentyTwentyMember" name="YearTwentyTwentyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_YearTwentyNineteenMember" name="YearTwentyNineteenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_YearTwentyEighteenMember" name="YearTwentyEighteenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_YearTwentySeventeenMember" name="YearTwentySeventeenMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="pten_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceCompletionYear" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceCompletionYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_MinimumPercentageOfFairValueTransactionsCorroboratedUsingObservableMarketInputsRequiredForLevelTwo" name="MinimumPercentageOfFairValueTransactionsCorroboratedUsingObservableMarketInputsRequiredForLevelTwo" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_OtherOperationMember" name="OtherOperationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_OtherLongTermLiabilitiesMember" name="OtherLongTermLiabilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="pten_RightsAgreementOutstandingCommonStockAcquisitionPercentageDescription" name="RightsAgreementOutstandingCommonStockAcquisitionPercentageDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="pten_RightsAgreementCommonStockHoldingPercentageDescription" name="RightsAgreementCommonStockHoldingPercentageDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
</xsd:schema>
