An acid-placement model for long horizontal wells in carbonate reservoirs

Varun Mishra, D. Zhu, A. D. Hill, K. Furui

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

22 Citations (Scopus)

Abstract

In several places around the world, notably the North Sea and the Middle East, carbonate reservoirs are being accessed with very long horizontal wells (2000 to 20,000 feet of reservoir section.) These wells are often acid stimulated to remove drilling fluid filter cakes and to overcome formation damage effects, or to create acid fractures or deep matrix stimulation to enhance productivity. Good acid coverage with a relatively small acid volume is required to economically obtain the desired broad reservoir access. We have developed a model to predict the placement of injected acid in a long horizontal well, and to predict the subsequent effect of the acid in creating wormholes, overcoming damage effects, and stimulating productivity. The model tracks the interface between the acid and the completion fluid in the wellbore, models transient flow in the reservoir during acid injection, considers frictional effects in the tubulare, and predicts the depth of penetration of acid as a function of the acid volume and injection rate at all locations along the completion. We have used this model to simulate treatments that are typical of those performed in the North Sea and in the Middle East. We present a hypothetical example of acid placement in a long horizontal section and an example of using the model to history match actual treatment data from a North Sea chalk well.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers, 7th European Formation Damage Conference 2007 - Pushing Technology Boundaries
Subtitle of host publicationRejuvenating Fields and Skills
PublisherSociety of Petroleum Engineers (SPE)
Pages727-735
Number of pages9
ISBN (Print)1604231858, 9781604231854
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventSociety of Petroleum Engineers, 7th European Formation Damage Conference 2007 - Pushing Technology Boundaries: Rejuvenating Fields and Skills - Scheveningen, Netherlands
Duration: 2007 May 302007 Jun 1

Publication series

NameSPE - European Formation Damage Conference, Proceedings, EFDC
Volume2

Other

OtherSociety of Petroleum Engineers, 7th European Formation Damage Conference 2007 - Pushing Technology Boundaries: Rejuvenating Fields and Skills
CountryNetherlands
CityScheveningen
Period07/5/3007/6/1

ASJC Scopus subject areas

  • Engineering(all)

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    Mishra, V., Zhu, D., Hill, A. D., & Furui, K. (2007). An acid-placement model for long horizontal wells in carbonate reservoirs. In Society of Petroleum Engineers, 7th European Formation Damage Conference 2007 - Pushing Technology Boundaries: Rejuvenating Fields and Skills (pp. 727-735). (SPE - European Formation Damage Conference, Proceedings, EFDC; Vol. 2). Society of Petroleum Engineers (SPE). https://doi.org/10.2118/107780-ms