Selective matrix acidizing of horizontal wells

Eduardo Da Motta, A. D. Hill, K. Sepehrnoori

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The productivity index of a horizontal well in an anisotropic medium is calculated during a process of partial acidization in which damage removal occurs only over a fraction of the length of the well. Two numerical simulators are used in this work: an acidizing simulator which calculates the permeability distribution around the wellbore and a reservoir simulator which calculates the productivity index of the well. By applying mathematical transformations, it was possible to reduce the acidizing model from a two-dimensional (2D) problem to a one-dimensional (ID) one. By comparing treatment results, it is possible to select the optimal volume of acid, injection rate, and fraction of the length to be acidized for each particular well. The same procedure may also be applied for vertical wells both with and without anisotropy. Simulation results indicate that the application of a partial acidizing strategy reduces the total amount of acid required for a significant improvement in well productivity. This may substantially reduce the financial, operational, and environmental risks involved in the treatment of a horizontal well. In most cases, the optimal injection rate for sandstone acidizing is the maximum rate which does not fracture the formation.

Original languageEnglish
Pages (from-to)43-52
Number of pages10
JournalJournal of Canadian Petroleum Technology
Volume36
Issue number5
Publication statusPublished - May 1997
Externally publishedYes

Fingerprint

Horizontal wells
Simulators
Productivity
Acidization
Anisotropic media
Acids
Sandstone
Anisotropy
Mathematical transformations

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Selective matrix acidizing of horizontal wells. / Da Motta, Eduardo; Hill, A. D.; Sepehrnoori, K.

In: Journal of Canadian Petroleum Technology, Vol. 36, No. 5, 05.1997, p. 43-52.

Research output: Contribution to journalArticle

Da Motta, E, Hill, AD & Sepehrnoori, K 1997, 'Selective matrix acidizing of horizontal wells', Journal of Canadian Petroleum Technology, vol. 36, no. 5, pp. 43-52.
Da Motta, Eduardo ; Hill, A. D. ; Sepehrnoori, K. / Selective matrix acidizing of horizontal wells. In: Journal of Canadian Petroleum Technology. 1997 ; Vol. 36, No. 5. pp. 43-52.
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