Selective matrix acidizing of horizontal wells

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

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

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 2D problem to a 1D 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
Title of host publicationProceedings - SPE International Symposium on Formation Damage Control
PublisherPubl by Society of Petroleum Engineers (SPE)
Pages535-548
Number of pages14
Publication statusPublished - 1994
Externally publishedYes
EventProceedings of the International Symposium on Formation Damage Control - Lafayette, LA, USA
Duration: 9 Feb 199410 Feb 1994

Other

OtherProceedings of the International Symposium on Formation Damage Control
CityLafayette, LA, USA
Period9/2/9410/2/94

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ASJC Scopus subject areas

  • Geology

Cite this

Da Motta, E., Hill, A. D., & Sepehrnoori, K. (1994). Selective matrix acidizing of horizontal wells. In Proceedings - SPE International Symposium on Formation Damage Control (pp. 535-548). Publ by Society of Petroleum Engineers (SPE).