Methods and systems for acidizing subterranean formations
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-043/22
C09K-008/74
E21B-043/25
C02F-011/06
출원번호
US-0394826
(2013-12-13)
등록번호
US-9540560
(2017-01-10)
국제출원번호
PCT/US2013/075067
(2013-12-13)
국제공개번호
WO2015/088561
(2015-06-18)
발명자
/ 주소
Beuterbaugh, Aaron Michael
Reyes, Enrique Antonio
Smith, Alyssa
출원인 / 주소
Halliburton Energy Services, Inc.
대리인 / 주소
McDermott Will & Emery LLP
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
A method for acidizing subterranean formations may include providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups
A method for acidizing subterranean formations may include providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid are protonated and the chelating agent is ineffective for complexing a metal ion; introducing the treatment fluid into a wellbore penetrating a subterranean formation comprising a carbonate mineral; reacting the acid with the carbonate mineral in the presence of the chelating agent, such that the acid at least partially spends as the pH of the treatment fluid rises; and complexing a metal ion with the chelating agent once the pH of the treatment fluid rises above a pKa value for one or more of the carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid.
대표청구항▼
1. A method comprising: providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiac
1. A method comprising: providing a treatment fluid comprising an aqueous carrier fluid, an acid, and a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid, the treatment fluid having a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid are protonated and the chelating agent is ineffective for complexing a metal ion;introducing the treatment fluid into a wellbore penetrating a subterranean formation comprising a carbonate mineral;reacting the acid with the carbonate mineral in the presence of the chelating agent, such that the acid at least partially spends as the pH of the treatment fluid rises; andcomplexing a metal ion with the chelating agent once the pH of the treatment fluid rises above a pKa value for one or more of the carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid. 2. The method of claim 1, wherein the treatment fluid further comprises an aqueous-miscible fluid. 3. The method of claim 1, wherein introducing the treatment fluid into the wellbore is below a fracture gradient of the subterranean formation. 4. The method of claim 1, wherein introducing the treatment fluid into the wellbore is at or above a fracture gradient of the subterranean formation. 5. The method of claim 1, wherein the carbonate mineral comprises at least one selected from the group consisting of calcite, dolomite, and any combination thereof. 6. The method of claim 1, wherein the treatment fluid is substantially free of hydrofluoric acid or a hydrofluoric acid-generating compound. 7. The method of claim 6, wherein the subterranean formation further comprises a siliceous material. 8. The method of claim 1, wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydrofluoric acid, formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, fluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, methanesulfonic acid, and any combination thereof. 9. The method of claim 8, wherein the treatment fluid, before introducing in the subterranean formation, comprises about 1% hydrochloric acid or greater by weight. 10. The method of claim 9, wherein the subterranean formation has a temperature of about 125° F. or above. 11. The method of claim 1, wherein the metal ion is selected from the group consisting of a calcium ion, a magnesium ion, an aluminum ion, an iron ion, and any combination thereof. 12. The method of claim 1, wherein reacting the acid with the carbonate mineral in the presence of the chelating agent comprises interacting the acid with the carbonate mineral in a manner to form one or more wormholes therein. 13. A treatment fluid comprising: an aqueous carrier fluid;a chelating agent comprising N-(phosphonomethyl)iminodiacetic acid;at least one selected from the group consisting of an acid, an acid-generating compound, and any combination thereof; andwherein the treatment fluid has a pH at or below that at which carboxylic or phosphonic acid groups of the N-(phosphonomethyl)iminodiacetic acid are protonated and the chelating agent is ineffective for complexing a metal ion. 14. The treatment fluid of claim 13 further comprising an aqueous-miscible fluid. 15. The treatment fluid of claim 13, wherein the treatment fluid is substantially free of hydrofluoric acid or a hydrofluoric acid-generating compound. 16. The treatment fluid of claim 13, wherein the acid is selected from the group consisting of hydrochloric acid, hydrobromic acid, hydrofluoric acid, formic acid, acetic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, fluoroacetic acid, difluoroacetic acid, trifluoroacetic acid, methanesulfonic acid, and any combination thereof. 17. The treatment fluid of claim 13, wherein the treatment fluid comprises about 1% hydrochloric acid or greater by weight. 18. The treatment fluid of claim 13, wherein the N-(phosphonomethyl)iminodiacetic acid is at about 0.1% to about 40% by weight of the treatment fluid. 19. The treatment fluid of claim 13, wherein the treatment fluid has a pH of about −1 to about 2. 20. A system comprising: a pump fluidly coupled to a tubular;the tubular containing a treatment fluid of claim 19.
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이 특허에 인용된 특허 (7)
Di Lullo Arias Gino F. (Singapore SGX) Ahmad Atikah J. (Singapore SGX), Acid treatment method for siliceous formations.
Hwa Chih M. (Palatine IL) Kelly John A. (Crystal Lake IL) Neton Janet (West Chester OH) Scanlon Patricia M. (Arlington MA) Gaudette Roger R. (Hudson NH), Control of scale in aqueous systems using certain phosphonomethyl amine oxides.
Chen Shih-Ruey T. (Pittsburgh PA) Matz Gary F. (Carneige PA) Schaper Raymond J. (Pittsburgh PA), N,N-bis(phosphonomethyl)-2-amino-1-propanol, derivatives and corresponding lower alkyl ethers and N-oxides thereof for h.
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