<SUBMISSION>
<ACCESSION-NUMBER>0000914062-06-000615
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20061211
<FILING-DATE>20061213
<DATE-OF-FILING-DATE-CHANGE>20061213
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>RPC INC
<CIK>0000742278
<ASSIGNED-SIC>1389
<IRS-NUMBER>581550825
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>2170 PIEDMONT RD NE
<CITY>ATLANTA
<STATE>GA
<ZIP>30324
<PHONE>4048882950
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>2170 PIEDMONT ROAD
<CITY>ATLANTA
<STATE>GA
<ZIP>30324
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>RPC ENERGY SERVICES INC
<DATE-CHANGED>19920703
</FORMER-COMPANY>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>RFT Investment Company, LLC
<CIK>0001383397
<STATE-OF-INCORPORATION>GA
<FISCAL-YEAR-END>1231
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>001-08726
<FILM-NUMBER>061274921
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>2801 BUFORD HIGHWAY, N.E.
<STREET2>#470
<CITY>ATLANTA
<STATE>GA
<ZIP>30329
<PHONE>404-486-4626
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>2801 BUFORD HIGHWAY, N.E.
<STREET2>#470
<CITY>ATLANTA
<STATE>GA
<ZIP>30329
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-12-11</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000742278</issuerCik>
        <issuerName>RPC INC</issuerName>
        <issuerTradingSymbol>RES</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001383397</rptOwnerCik>
            <rptOwnerName>RFT Investment Company, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O RFA MANAGEMENT CO., LLC</rptOwnerStreet1>
            <rptOwnerStreet2>2801 BUFORD HIGHWAY, N.E., #470</rptOwnerStreet2>
            <rptOwnerCity>ATLANTA</rptOwnerCity>
            <rptOwnerState>GA</rptOwnerState>
            <rptOwnerZipCode>30329</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>60800</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Glenn P. Grove, Jr.,                                         BY:  LOR, Inc. - Manager, by its Asst. Secretary</signatureName>
        <signatureDate>2006-12-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
