<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2017-01-20</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001449488</issuerCik>
        <issuerName>CSI Compressco LP</issuerName>
        <issuerTradingSymbol>CCLP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000844965</rptOwnerCik>
            <rptOwnerName>TETRA TECHNOLOGIES INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>24955 INTERSTATE 45 NORTH</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>THE WOODLANDS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77380</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle></officerTitle>
            <otherText>Director by Deputization (3)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001522703</rptOwnerCik>
            <rptOwnerName>Compressco Field Services, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>OKLAHOMA CITY</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>73102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle></officerTitle>
            <otherText>Director by Deputization (3)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000904147</rptOwnerCik>
            <rptOwnerName>COMPRESSCO INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>101 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 1200</rptOwnerStreet2>
            <rptOwnerCity>OKLAHOMA CITY</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>73102</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle></officerTitle>
            <otherText>Director by Deputization (3)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001520660</rptOwnerCik>
            <rptOwnerName>CSI Compressco GP Inc</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3809 S FM 1788</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MIDLAND</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>79706</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>true</isOther>
            <officerTitle></officerTitle>
            <otherText>Director by Deputization (3)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units representing limited partner interests</value>
            </securityTitle>
            <transactionDate>
                <value>2017-01-24</value>
            </transactionDate>
            <deemedExecutionDate>
                <value>2017-01-20</value>
            </deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>159192.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>14250709.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>see footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The common units representing limited partner interests (the &quot;Common Units&quot;) reported hereby were issued by CSI Compressco LP (the &quot;Issuer&quot;) as consideration for the fourth quarter reimbursement of certain expenses (the &quot;Fourth Quarter Reimbursement&quot;) to TETRA Technologies, Inc. (&quot;TTI&quot;) pursuant to that certain Omnibus Agreement, dated June 20, 2011, as amended on June 20, 2014, by and among TTI, CSI Compressco GP Inc.(the &quot;General Partner&quot;) and the Issuer. The board of directors of the General Partner (the &quot;Board&quot;) and a Conflicts Committee established by the Board (the &quot;Conflicts Committee&quot;) approved the issuance of the Common Units equal in value to the amount of the Fourth Quarter Reimbursement, instead of making a cash payment for such amount (the &quot;Common Unit Issuance&quot;).</footnote>
        <footnote id="F2">(cont.) The Conflicts Committee approved the Common Unit Issuance with such number of Common Units determined by the quotient of the Fourth Quarter Reimbursement amount divided by 98% of the arithmetic average of the volume weighted average trading price of the Common Units on each trading day during the twenty day trading period immediately prior to January 20, 2017.</footnote>
        <footnote id="F3">Each of the reporting persons may be deemed a &quot;director by deputization&quot; of the Issuer by reason of the fact that all directors of the General Partner of the Issuer are designated by TTI.</footnote>
        <footnote id="F4">The Common Units reported hereby in connection with the Common Unit Issuance are owned directly by CSI Compressco Investment, LLC, a direct, wholly owned subsidiary of the General Partner, and may be deemed to be beneficially owned by (i) the General Partner, a direct, wholly owned subsidiary of Compressco Field Services, L.L.C. (&quot;CFS&quot;) (ii) CFS, a direct, wholly owned subsidiary of Compressco, Inc. (&quot;CI&quot;), (iii) CI, a direct, wholly owned subsidiary of TTI and (iv) TTI. 1,476,087 of the reported Common Units are owned directly by TETRA International Incorporated, a direct, wholly owned subsidiary of TTI, and may be deemed to be beneficially owned by TTI. 11,225,140 of the Common Units are owned directly by the General Partner, and may be deemed beneficially owned by TTI.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Bass C. Wallace, Jr., Sr. Vice President and General Counsel of TETRA Technologies, Inc., a Delaware corporation</signatureName>
        <signatureDate>2017-01-24</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bass C. Wallace, Jr., Attorney-in-fact for Compressco Field Services, L.L.C., an Oklahoma limited liability company</signatureName>
        <signatureDate>2017-01-24</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bass C. Wallace, Jr., Attorney-in-fact for Compressco, Inc., a Delaware corporation</signatureName>
        <signatureDate>2017-01-24</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bass C. Wallace, Jr., General Counsel, Assistant Secretary, Assistant Treasurer of CSI Compressco GP Inc., a Delaware corporation</signatureName>
        <signatureDate>2017-01-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
