Suction of gases from boreholes in coal mining.docx

Suction of gases from boreholes in coal mining.docx

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Suctionofgasesfromboreholesincoalmining

Suctionofgasesfromboreholesincoalmining

UnitedStatesPatent4321967

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Gas,particularlymethane,issuckedfromaborehole（B）extendingfromacoalmineworkingbymeansofacasingconsistingoftubularplasticssections（8）bymeansofavacuumpumpconnectedtothelowerendofthecasing.Thecasingissealedtotheboreholebyaslidingseal

（2）whichallowsthecasingtobemovedupanddowntheboreholeuntiltheupperendofthecasingisatthelevelofthemaximumyieldofgas.Theannularspacebetweenthecasingandboreholewallisthenfilledwithaliquidwhichexpandsandsetstoformapolyurethanefoam（4）.

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USPatentReferences:

Methodofsecuringobjectsinpassagesandarrangementobtainedthereby,particularlyhoselinessealinglysecuredinthepassagesofcoalminesfordustsuppression

Meyeretal.-February,1977-4008576

Inventors:

Koppe,Uwe（Velbert,DE）

Stegmanns,Walter（Oberhausen,DE）

Weisner,Horst（Herdecke,DE）

ApplicationNumber:

06/171009

PublicationDate:

03/30/1982

FilingDate:

07/18/1980

ExportCitation:

Clickforautomaticbibliographygeneration

Assignee:

MaschinenfabrikKorfmannGmbH（DE）

PrimaryClass:

166/250.01

OtherClasses:

166/295,299/12

InternationalClasses:

E21F7/00;F16L47/06;F16L55/132;E21F7/00;F16L47/00;F16L55/10;（IPC1-7）:

E21B33/124;E21B33/134;E21F7/00

FieldofSearch:

299/12,299/10,299/1,166/294,166/295,166/250,166/314

ViewPatentImages:

DownloadPDF4321967

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ForeignReferences:

DE1939989

February,1971

DE2255267

May,1974

DE2556316

June,1977

299/12

DE2618787

November,1977

299/12

PrimaryExaminer:

Novosad,StephenJ.

Attorney,AgentorFirm:

Burns,RobertE.

Lobato,EmmanuelJ.

Adams,BruceL.

Claims:

Weclaim:

1.Inamethodofdrawingoffgasbysuctionincoalminingbymeansofasealedcasingwhichisinsertedinaborehole,theimprovementcomprisingthestepsof:

sealingsaidcasingtosaidboreholebyasealwhichpermitsmovementofsaidcasingineitherdirectionalongsaidborehole;movingsaidcasingalongsaidboreholeandmeasuringCH4contentofgassuckedintosaidcasingatvariouspositionsalongsaidboreholetodetermineapositionofsaidcasinginwhichgaswithsubstantiallythemaximumCH4contentcanbesuckedin;positioningsaidcasinginapositiontosuckingaswithsubstantiallythemaximumCH4content;andatleastpartiallyfillinganannularspaceformedbetweensaidcasingandthewallofsaidboreholewithaliquidwhichexpandsinsaidspacetoformapolyurethanefoam.

2.Amethodaccordingtoclaim1,whereinsaidliquidwhichexpandstoformsaidpolyurethanefoamcomprisesamixtureofBaygalK55BandBaymidurK88,saidBaygalK55Bconsistingof100partsbyweightofBaygalK55and17.5partsbyweightofcastoroilandfrom0.5to3.0partsbyweightofwater.

3.Amethodaccordingtoclaim1,whereinthestepofatleastpartiallyfillinganannularspacewithaliquidcomprisesforcingsaidliquidintosaidspacebymeansofagearpump.

4.Amethodaccordingtoclaim1,whereinthestepofatleastpartiallyfillinganannularspacewithaliquidcomprisesforcingsaidliquidintosaidspacebyreleasingtheliquidfromacartridgewithinsaidspace.

5.Amethodaccordingtoclaim1,whereinsaidcasinghasaleadingandatrailingendandisprovidedonlyatsaidtrailingendwithapermanentlyfullyeffectiveseal,andwhereinthestepofatleastpartiallyfillinganannularspacewithaliquidcomprisesintroducingsuchquantityofsaidliquidintosaidannularspacethatsaidpolyurethanefoam,uponhardeningwithincreaseinvolume,expandsupadjacenttosaidlevelinsaidboreholeofmaximumCH4yield.

6.Amethodaccordingtoclaim5,whereinsaidsealcomprisesanelasticcoresurroundedbyalubricantcompositionandacoating,thecrosssectionofsaidcorebeingnormallylargerthanthatofsaidboreholewherebysaidcoreiscompresseduponinsertionintosaidborehole.

7.Amethodaccordingtoclaim1,whereinsaidcasinginaplasticstubing,havinganelectricalyconductivesurface.

8.AmethodofwithdrawinggascontainingCH4fromanundergoundboreholecomprising:

providingatubularcasinghavingaleadingendwhichterminatesinasuctionmouthandatrailingendandhavinganouterdiametersmallerthanthediameterofanundergroundboreholefromwhichgasistobewithdrawn;insertingtheleadingendofthetubularcasingintotheborehole;sealingtheleadingendportionofthetubularcasingtotheboreholesidewallsoastopermitlengthwisemovementofthetubularcasingalongtheboreholewhilemaintainingtheleadingendportionofthetubularcasinginsealedrelationshipwiththeboreholesidewall;positioningthetubularcasingalongtheboreholesothatthesuctionmouthoftheleadingendofthetubularcasingissuitablypositionedtowithdrawtherethroughgaswithsubstantiallythemaximumCH4contentfromtheborehole;sealingatleastthelowerpartoftheannularspaceformedbetweenthetrailingendportionofthetubularcasingandtheboreholesidewallwithadosedinjectionofliquidwhichexpandsintheannularspacetoformanannularfoamseal;andapplyingsuctiontothetubularcasingtowithdrawthroughthesuctionmouthofthetubularcasingleadingendgaswithsubstantiallythemaximumCH4contentfromtheborehole.

9.Amethodaccordingtoclaim8;whereinthestepofpositioningthetubularcasingalongtheboreholecomprisesmovingthetubularcasingalongtheboreholewhileapplyingsuctiontothetubularcasingtowithdrawgasfromtheborehole,measuringtheCH4contentofthewithdrawngasatdifferentpositionsofthetubularcasingalongtheborehole,andpositioningthetubularcasingsothatgaswithsubstantiallythemaximumCH4contentiswithdrawnfromtheborehole.

10.Amethodaccordingtoclaim8or9;whereinthestepofsealingatleastthelowerpartoftheannularspacecomprisesintroducingadosedinjectionoftheliquidbyreleasingtheliquidfromasetofcartridgesdisposedwithintheannularspace.

11.Amethodaccordingtoclaim8or9;whereinthestepofsealingatleastthelowerpartoftheannularspacecomprisessealingsubstantiallytheentireannularspacefromthetrailingendportionofthetubularcasingtothesealedleadingendportionofthetubularcasing.

12.Amethodaccordingtoclaim8or9;whereintheannularfoamsealiscomprisedofpolyurethane.

Description:

Theinventionrelatestoaprocessfordrawingoffgasbysuctionfromboreholesincoalminesbymeansofsealedcasings,whichareinsertedintheboreholesandcanbemovedtoandfroalongtheborehole,andtoaboreholeassemblyforthispurpose.

AccordingtoWestGermanPat.No.1939989,anelasticsealforsealingcasingsinboreholesfordrawingoffgasbysuctionincoalminingisknown,theelasticsealbeingcompressedtoadiameterbelowthediameteroftheboreholeonintroductionofthecasingintothedrilling.Ajacket-likeenvelopeservesforthispurpose,whichcanbepulledofffromtheelasticsealbymeansofatensionmeanspassingoutoftheborehole.Inthiscase,theelasticsealpreferablyconsistsofopen-poreelastomers.Inthisway,theelasticsealcanbeconvenientlyintroducedwiththecasingintotheborehole,although,intherelaxedstate,thediameterofthesealislargerthantheinternaldiameteroftheborehole.ThedisadvantageofthistypeofcasingandsealliesinthefactthatitisnotpossibletomeasurethepointofmaximumCH4-yieldinthedrilling,withthecasingbeingfixedandsealed,anditisnotpossibletomovetheendofthecasinginthedrillingtothepositionofmaximumCH4-yield.

Furthermore,itisknowntouseexpandedsealingmaterialswhicharepumpedupthroughaseparateline,passingupthroughthecasingtotheleveloftheseal,wherethelineextendsoutthroughthewallofthecasing.Expandedsealingmaterialsofthistyperequirecomplexsealsatthepassagepointthroughthecasing;andbesides,difficultyliesinkeepingtheexpandedsealpressureconstant.

Furthermore,itisknowntofilluptheannularspacebetweenthecasingandtheboreholewallwithasealingcomposition,forexamplewithacementsludge.Althoughasealbetweenthewholeofthesurfaceofthecasingandthewalloftheboreholecanbeachievedwithaboreholesealmadewithcementsludge,itisdisadvantageousinsofaras,shortlyafterthesettingofthecementsludge,leaksappear.Forexample,thesurroundinggroundmovementdamagesthecementjacketaroundthesuctioncasing,andthejacketdevelopscrackstoamarkedextent,sothatshortcircuitsoccuraroundthecasingafterashorttime.Afurtherdisadvant