Relationship between reservoir mineralogy and optimum sandstone acid treatment

Eduardo Da Motta, Benjamin Plavnik, R. S. Schechter, A. D. Hill

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

2 Citations (Scopus)

Abstract

Mud acid treatments are normally designed by approximating the complex mineralogy of a sandstone using a 'lumping' procedure. Minerals are classified as either fast reacting or slow reacting and the rates of their reaction with hydrofluoric acid are determined by analyzing the acid effluent from acidized core plugs. For most treatments carried out at modest temperatures and at reasonable rates, this approach is satisfactory. In this paper, we show that at higher reaction temperatures, the simple two-mineral dissolution model does not apply because an intermediate product of the HF reaction with quartz, feldspars, and clays (H2SiF6) begins to react further with both clays and feldspars. This new reaction must be included to model the data. The additional reaction, not observed at lower temperatures, has important consequences when it does occur. For example, the acid injection rate is no longer a critical factor. In fact, slow rates in deep formations are preferred. The analysis presented here shows that retarded acids are unnecessary. Contrary to previous concepts, mud acid itself provides a deep penetrating capability. This surprising result may account for the high percentage of successful treatments even when carried out under a wide range of differing conditions.

Original languageEnglish
Title of host publicationProc Int Symp Form Damage Control
Editors Anon
PublisherPubl by Soc of Petroleum Engineers of AIME
Pages323-336
Number of pages14
Publication statusPublished - 1992
Externally publishedYes
EventProceedings of the International Symposium on Formation Damage Control - Lafayette, LA, USA
Duration: 26 Feb 199227 Feb 1992

Other

OtherProceedings of the International Symposium on Formation Damage Control
CityLafayette, LA, USA
Period26/2/9227/2/92

Fingerprint

Mineralogy
Sandstone
Acids
Clay
Minerals
Hydrofluoric acid
Temperature
Quartz
Effluents
Dissolution

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Da Motta, E., Plavnik, B., Schechter, R. S., & Hill, A. D. (1992). Relationship between reservoir mineralogy and optimum sandstone acid treatment. In Anon (Ed.), Proc Int Symp Form Damage Control (pp. 323-336). Publ by Soc of Petroleum Engineers of AIME.

Relationship between reservoir mineralogy and optimum sandstone acid treatment. / Da Motta, Eduardo; Plavnik, Benjamin; Schechter, R. S.; Hill, A. D.

Proc Int Symp Form Damage Control. ed. / Anon. Publ by Soc of Petroleum Engineers of AIME, 1992. p. 323-336.

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

Da Motta, E, Plavnik, B, Schechter, RS & Hill, AD 1992, Relationship between reservoir mineralogy and optimum sandstone acid treatment. in Anon (ed.), Proc Int Symp Form Damage Control. Publ by Soc of Petroleum Engineers of AIME, pp. 323-336, Proceedings of the International Symposium on Formation Damage Control, Lafayette, LA, USA, 26/2/92.
Da Motta E, Plavnik B, Schechter RS, Hill AD. Relationship between reservoir mineralogy and optimum sandstone acid treatment. In Anon, editor, Proc Int Symp Form Damage Control. Publ by Soc of Petroleum Engineers of AIME. 1992. p. 323-336
Da Motta, Eduardo ; Plavnik, Benjamin ; Schechter, R. S. ; Hill, A. D. / Relationship between reservoir mineralogy and optimum sandstone acid treatment. Proc Int Symp Form Damage Control. editor / Anon. Publ by Soc of Petroleum Engineers of AIME, 1992. pp. 323-336
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