Method for inhibiting or controlling inorganic scale formations
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-037/00
E21B-043/26
E21B-043/25
E21B-043/27
출원번호
US-0671156
(2003-09-25)
발명자
/ 주소
Ke,Mingjie
Qu,Qi
출원인 / 주소
BJ Services Company
대리인 / 주소
Jones & Smith, LLP
인용정보
피인용 횟수 :
9인용 특허 :
11
초록▼
A formulation containing a copolymer derived from a cationic monomer effectively inhibits and controls the formation of inorganic scales. The formulation has particular application in the removal of zinc sulfide and iron sulfide scales formed when zinc bromide brines are used as completion fluids.
A formulation containing a copolymer derived from a cationic monomer effectively inhibits and controls the formation of inorganic scales. The formulation has particular application in the removal of zinc sulfide and iron sulfide scales formed when zinc bromide brines are used as completion fluids. The copolymer exhibit high solubility in high-density brines, such as zinc bromide brines. The polymers may be introduced into an oil or gas well as a portion of a carrier fluid or with brine. The preferred copolymer for use in the invention contains an acrylamide unit and a diallyldimethylammonium salt and, optionally, an acrylic acid or a salt thereof. The weight average molecular weight of such inhibitor copolymers is generally between from about 500,000 to about 5,000,000.
대표청구항▼
What is claimed is: 1. A method for inhibiting or controlling inorganic scale formations in a subterranean formation or in a wellbore, comprising pumping downhole a copolymer comprising: quaternary ammonium salt; and an acrylamide unit wherein the inorganic scale formations are zinc sulfide or iro
What is claimed is: 1. A method for inhibiting or controlling inorganic scale formations in a subterranean formation or in a wellbore, comprising pumping downhole a copolymer comprising: quaternary ammonium salt; and an acrylamide unit wherein the inorganic scale formations are zinc sulfide or iron sulfide scale formations. 2. The method of claim 1, wherein the quaternary ammonium salt is selected from the group consisting of dialkyldiallylammonium salt, polyvinyl benzyl trialkyl ammonium salts, salts of polyepichlorohydrin quaternized with trialkyl amine, polymethacrylamidopropyltrialkyl ammonium salts, polymethacryloyloxyethyltrialkyl ammonium salts, and polymethacryloyloxyethyl dialkyl hydroxyalkyl ammonium salt. 3. The method of claim 2, wherein the quaternary ammonium salt is a dialkyldiallylammonium salt. 4. The method of claim 3, wherein the dialkyldiallylammonium salt is a dimethyldiallylammonium salt. 5. The method of claim 4, wherein the dimethyldiallylammonium salt is dimethyldiallylammonium chloride. 6. The method of claim 5, wherein the acrylamide unit is acrylamide. 7. The method of claim 4, wherein the molar ratio of acrylamide unit:diallyldimethylammonium salt is between from about 1:5 to about 5:1. 8. The method of claim 7, wherein the molar ratio of acrylamide unit:diallyldimethylammonium salt is from about 1:1 to about 3:1. 9. The method of claim 2, wherein the quaternary ammonium salt is a polyvinyl benzyl trialkyl ammonium salt. 10. The method of claim 9, wherein the polyvinyl benzyl trialkyl ammonium salt is polyvinyl benzyl trimethyl ammonium salt. 11. The method of claim 1, wherein the acrylamide unit is selected from the group consisting of acrylamide, (meth)acrylamide, diacetone acrylamide or N-methylolacrylamide. 12. The method of claim 11, wherein the acrylamide unit is acrylamide. 13. The method of claim 1, wherein the copolymer is pumped downhole as a component of a carrier fluid. 14. The method of claim 1, wherein the copolymer is pumped downhole as part of a brine. 15. The method of claim 12, wherein the brine contains calcium bromide, zinc bromide, calcium chloride or a combination thereof or sodium bromide. 16. The method of claim 1, wherein the copolymer is pumped downhole as a component of a fracturing fluid. 17. The method of claim 1, wherein the copolymer is pumped downhole as a component of an acidizing fluid. 18. The method of claim 1, wherein the copolymer further comprises an acrylic acid unit. 19. The method of claim 18, wherein the acrylic acid unit is acrylic acid, (meth)acrylic acid or a salt thereof. 20. A method for inhibiting or controlling inorganic scale formations in a subterranean formation or in a wellbore, comprising pumping downhole a copolymer comprising: quaternary ammonium salt; and an acrylamide unit, wherein the weight average molecular weight of the copolymer is between from about 500,000 to about 5,000,000 and wherein the inorganic scale formations are zinc sulfide or iron sulfide scale formations. 21. The method of claim 20, wherein the copolymer is pumped downhole as a component of a carrier fluid. 22. The method of claim 20, wherein the copolymer is pumped downhole as a component of a brine. 23. The method of claim 20, wherein the copolymer is pumped downhole as a component of a fracturing fluid. 24. The method of claim 20, wherein the copolymer is pumped downhole as a component of an acidizing fluid. 25. The method of claim 20, wherein the copolymer is soluble in a brine having a density greater than or equal to 14.0 lb/gal. 26. The method of claim 20, wherein the quaternary ammonium salt is selected from the group consisting of a polyvinyl benzyl trialkyl ammonium salt and a salt of polyepichlorohydrin quaternized with trialkyl amine. 27. The method of claim 20, wherein the quaternary ammonium salt is selected from the group consisting of polyvinyl benzyl trimethyl ammonium salts, salts of polyepichlorohydrin quaternized with trimethyl amine, polymethacrylamidopropyltrimethyl ammonium salts, polymethacryloyloxyethyltrimethyl ammonium salts and polymethacryloyloxyethyl dimethyl hydroxyethyl ammonium salts. 28. A method for inhibiting or controlling inorganic scale formations in a subterranean formation or in a wellbore, comprising pumping downhole a copolymer comprising: quaternary ammonium salt; and an acrylamide unit, wherein the copolymer is a block or random copolymer and wherein the inorganic scale formations are zinc sulfide or iron sulfide scale formations. 29. The method of claim 28, wherein the copolymer is a block copolymer composed of blocks of polyacrylamide and polydiallyldimethylammonium salt and, optionally, blocks of polyacrylic acid or a sodium salt thereof. 30. The method of claim 28, wherein the copolymer is a random copolymer composed of units of acrylamide and diallyldimethylammonium salt and, optionally, acrylic acid or a sodium salt thereof. 31. The method of claim 28, wherein the copolymer is a terpolymer of acrylamide, diallyldimethylammonium salt and acrylic acid or a salt thereof and further wherein the weight ratio of acrylamide:diallyldimethylammonium salt:acrylic acid is about 1:1:1. 32. The method of claim 28, wherein the copolymer is pumped downhole as a component of a carrier fluid or brine.
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이 특허에 인용된 특허 (11)
Brookey Tommy F. ; House Roy F., Aphron-containing well drilling and servicing fluids of enhanced stability.
Reeves ; III Henry C. (Layfayette LA) Potter Gary F. (Tulsa OK) Riley Suzanne M. (Houston TX), Method for treatment and/or workover of injection wells.
Emmons Daniel H. (Rosenberg TX) Fong Dodd W. (Naperville IL) Kinsella Mary A. (Manhattan IL), Phosphonate-containing polymers for controlling scale in underground petroleum-containing formations and equipment assoc.
Watkins David R. (Irvine CA) Clemens Joseph J. (Midway City CA) Smith John C. (Midland TX) Sharma Surinder N. (Diamond Bar CA) Edwards Hetty G. (Fullerton CA), Use of scale inhibitors in hydraulic fracture fluids to prevent scale build-up.
Wang,Xiaolan; Qu,Qi; Ke,Mingjie, Method for inhibiting or controlling inorganic scale formations with copolymers of acrylamide and quaternary ammonium salts.
Hurtevent, Christian; Baraka-Lokmane, Salima; Ordonez-Varela, John-Richard; Tillement, Olivier; Rossetti, Fabien; Ould Metidji, Mahmoud, Use of a copolymer made from styrene sulphonic acid to inhibit or slow the formation of sulphide deposits.
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