Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution

Eduardo Da Motta, C. R. Miranda, S. M C Anjos, J. A. Ribeiro, E. Chaves

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Cement attack by acid during matrix acidizing operations has created severe zonal isolation problems in wells with multiple adjacent permeable zones, operated by PETROBRAS. This effect was observed in several wells treated with conventional HCl-HF acid mixtures, even when cement bond logs prior to the acid job were excellent. This paper presents a series of lab experiments showing that acetic acid, alone or mixed with HF, dissolves much less cement than HCl and HCl-HF mixtures with the same carbonate dissolving power. The reaction of acetic acid with cement forms a protective skin that inhibits further acid attack. The organic formulations were tested in an acidizing simulator, before being used in the field. The paper also presents field test results which confirmed that the acetic acid mixtures did not break zonal isolation (cement consumption was restrained to the perforated interval) and were able to generate 6- to 40-fold increases in the injectivity and productivity of the wells.

Original languageEnglish
Title of host publicationProceedings - SPE International Symposium on Formation Damage Control
Pages77-88
Number of pages12
Publication statusPublished - 1996
Externally publishedYes
EventProceedings of the 1996 International Symposium on Formation Damage Control - Lafayette, LA, USA
Duration: 14 Feb 199615 Feb 1996

Other

OtherProceedings of the 1996 International Symposium on Formation Damage Control
CityLafayette, LA, USA
Period14/2/9615/2/96

Fingerprint

acetic acid
cement
dissolution
well
acid
simulator
skin
fold
carbonate
productivity
matrix
experiment

ASJC Scopus subject areas

  • Geology

Cite this

Da Motta, E., Miranda, C. R., Anjos, S. M. C., Ribeiro, J. A., & Chaves, E. (1996). Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution. In Proceedings - SPE International Symposium on Formation Damage Control (pp. 77-88)

Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution. / Da Motta, Eduardo; Miranda, C. R.; Anjos, S. M C; Ribeiro, J. A.; Chaves, E.

Proceedings - SPE International Symposium on Formation Damage Control. 1996. p. 77-88.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Da Motta, E, Miranda, CR, Anjos, SMC, Ribeiro, JA & Chaves, E 1996, Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution. in Proceedings - SPE International Symposium on Formation Damage Control. pp. 77-88, Proceedings of the 1996 International Symposium on Formation Damage Control, Lafayette, LA, USA, 14/2/96.
Da Motta E, Miranda CR, Anjos SMC, Ribeiro JA, Chaves E. Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution. In Proceedings - SPE International Symposium on Formation Damage Control. 1996. p. 77-88
Da Motta, Eduardo ; Miranda, C. R. ; Anjos, S. M C ; Ribeiro, J. A. ; Chaves, E. / Acidizing wells with acetic/HF acid mixtures to minimize cement dissolution. Proceedings - SPE International Symposium on Formation Damage Control. 1996. pp. 77-88
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