(12) Translation of european patent specification

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1 (12) Translation of european patent specification (11) NO/EP B1 (19) NO NORWAY (1) Int Cl. C09K 8/487 (06.01) C04B 24/28 (06.01) C04B 28/02 (06.01) Norwegian Industrial Property Office (21) Translation Published (80) Date of The European Patent Office Publication of the Granted Patent (86) European Application Nr (86) European Filing Date (87) The European Application s Publication Date (30) Priority , US, , US, (84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR (73) Proprietor Halliburton Energy Services, Inc., P.O. Box 1431, Duncan, OK 7333, US-USA (72) Inventor LEWIS, Samuel, J., 0 Meadowview Drive, Duncan, OK 7333, US-USA CHATTERJI, Jiten, 2213 Scott Lane, Duncan, OK 7333, US-USA KING, Bobby, J., 2780 S. 27th Street, Duncan, OK 7333, US-USA BRENNEIS, Darrell, Chad, RR 2, Box 19, Marlow, OK 730, US-USA (74) Agent or Attorney Curo AS, Industriveien 3, 7080 HEIMDAL, Norge (4) Title CEMENT COMPOSITIONS COMPRISING HUMIC ACID GRAFTED FLUID LOSS CONTROL ADDITIVES AND METHODS OF USING THEM (6) References Cited: EP-A US-A US-A

2 Enclosed is a translation of the patent claims in Norwegian. Please note that as per the Norwegian Patents Acts, section 66i the patent will receive protection in Norway only as far as there is agreement between the translation and the language of the application/patent granted at the EPO. In matters concerning the validity of the patent, language of the application/patent granted at the EPO will be used as the basis for the decision. The patent documents published by the EPO are available through Espacenet ( or via the search engine on our website here: NO/EP22304

3 1 Patentkrav 1. Brønnsementblanding omfattende: en sement; og et fluidtapsbegrensende tilsetningsmiddel omfattende en podet kopolymer, idet den podede kopolymer omfatter en stamme og minst fire podede monomere valgt fra gruppen bestående av 2-akrylamido-2-metylpropansulfonsyre, akrylamid, akrylsyre, vinylfosfonsyre, diallyldimetylammoniumklorid, og salter derav, idet stammen omfatter et humussyresalt. 2. Brønnsementblanding ifølge krav 1, idet vannet er til stede i en mengde i området fra 3 til 70 vekt-% av sementen. 3. Brønnsementblanding ifølge krav 1, idet vannet er valgt fra gruppen bestående av ferskvann og 1 saltvann. 4. Brønnsementblanding ifølge krav 1, idet sementen omfatter en hydraulisk sement.. Brønnsementblanding ifølge krav 1, idet sementen omfatter en hydraulisk sement valgt fra gruppen bestående av en Portland sement, en puzzolan-sement, en gipssement, en sement med høyt aluminainnhold, en slaggsement, en silikasement og kombinasjoner av de nevnte. 6. Brønnsementblanding ifølge krav 1, idet den podede kopolymer omfatter stammen i en mengde i området fra til 0 vekt-% av den podede kopolymer på tørr basis, og idet den podede 2 kopolymer omfatter minst fire podede monomere i en mengde i området fra 0 til 90 vekt-% av den podede kopolymer på tørr basis. 7. Brønnsementblanding ifølge krav 1, idet stammen omfatter en monomer valgt fra gruppen 30 bestående av polyvinylalkohol, polyetylenoksid, polypropylenoksid, polyetylenimin og kombinasjoner derav. 8. Brønnsementblanding ifølge krav 1, idet de podede monomere omfatter 2-akrylamido-2- metylpropansulfonsyre saltet, akrylamidet, akrylsyresaltet, og diallyldimetylammoniumkloridet. EP B1

4 2 9. Brønnsementblanding ifølge krav 1, idet den podede kopolymer har et molforhold mellom 2- akrylamido-2-metylpropansulfonsyre salt: akrylamid; akrylsyresalt: diallyldimetylammoniumklorid i området fra 4:3:2:1 til 4:1:0,:0,1.. Brønnsementblanding ifølge krav 1, idet den podede kopolymer har et molforhold mellom 2- akrylamido-2-metylpropansulfonsyre salt: akrylamid: vinylfosfonsyresalt: diallyldimetylammoniumklorid i området fra 4:4:1:2 til 4:1:0,1:0, Brønnsementblanding ifølge krav 1, idet stammen er til stede i den podede kopolymer i en mengde i området fra til vekt-% på tørr basis. 12. Brønnsementblanding ifølge krav 1, idet det fluidtapsbegrensende tilsetningsmiddel er til stede i sementblandingen i en mengde i området fra 0,1 til vekt-% av sementen Brønnsementblanding ifølge krav 1, idet brønnsementblandingen omfatter et tilsetningsmiddel valgt fra gruppen bestående av et dispergeringsmiddel, et stivningsretarderende middel, en akselerator, et skumdempende middel, et middel mot tap av sirkulasjonsfluid, et salt, flygeaske, fibre, en styrkereduserende middel, et vektøkendemiddel, vitrifisert leirskifer, et lettvekts additiv, og kombinasjoner av de nevnte. 14. Brønnsementblanding ifølge krav 1, idet brønnsementblandingen omfatter krystallinsk silika. 1. Brønnsementblanding ifølge krav 1, 6 eller 9, omfattende: en hydraulisk sement; og et fluidtapsbegrensende tilsetningsmiddel som omfatter en podet kopolymer, idet den podede kopolymer omfatter en stamme og podede monomere, idet stammen omfatter et humussyresalt, de podede monomere omfatter 2-akrylamido-2-metylpropansulfonsyresalt, akrylamid, akrylsyresalt, og diallyldimetylammoniumklorid; eller en brønnsementblanding ifølge krav 1, 6 eller, omfattende: en hydraulisk sement; og et fluidtapsbegrensende tilsetningsmiddel omfattende en podet kopolymer, idet den podede kopolymer omfatter en stamme og podede monomere, idet stammen omfatter et humussyresalt, de podede monomere omfatter 2-akrylamido-2-metylpropansulfonsyresalt, akrylamid, vinylfosfonsyresalt, og diallyldimetylammoniumklorid. EP B1

5 3 16. Fremgangsmåte for sementering i en underjordisk formasjon, omfattende: å innføre en sementblanding ifølge hvilket som helst av kravene 1 til, eller krav 1, når avhengig av krav 1, i en underjordisk formasjon. 17. Fremgangsmåte ifølge krav 16, når avhengig av 1, idet innføring av sementblandingen i den underjordiske formasjon omfatter å innføre sementblandingen i et borehull med en bunnhullsirkulasjonstemperatur på minst 260 C (00 F). 18. Fremgangsmåte ifølge krav 16, når avhengig av krav 1, omfattende å gi sementblandingen anledning til å stivne i den underjordiske formasjon. 19. Fremgangsmåte for sementering i en underjordisk formasjon, omfattende: å innføre en sementblanding ifølge krav 1, 6, 9 eller eller som angitt i krav 17, i et rom 1 mellom en rørstreng og en underjordisk formasjon; samt å gi sementblandingen anledning til å stivne i rommet mellom rørstrengen og den underjordiske formasjon.. Fremgangsmåte ifølge krav 19, omfattende å kjøre rørstrengen inn i et brønnhull som penetrerer den underjordiske formasjonen, idet sementblandingen er som definert i krav 1. EP B1

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