Modeling CaCO{sub 3} deposition in geothermal wellbores

PDF Version Also Available for Download.

Description

The capacity of a geothermal liquid to carry calcium varies mainly with the concentrations of CO{sub 2} and HCO{sub 3}, temperature and ionic strength, of which the CO{sub 2} concentration (pressure) changes most in the wellbore. Wellbore models that carry accurate computations for CO{sub 2} and other gas pressures might be adapted to compute profile thicknesses of CaCO{sub 3} scale. A general model for carbonate scale deposition in a wellbore must make a simultaneous accounting for pressures of H{sub 2}O, CO{sub 2}, and two or three other gases plus salt effects on those pressures. In addition, the elevation of flash ... continued below

Physical Description

25-31

Creation Information

Michels, Donald E. January 1, 1992.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

The capacity of a geothermal liquid to carry calcium varies mainly with the concentrations of CO{sub 2} and HCO{sub 3}, temperature and ionic strength, of which the CO{sub 2} concentration (pressure) changes most in the wellbore. Wellbore models that carry accurate computations for CO{sub 2} and other gas pressures might be adapted to compute profile thicknesses of CaCO{sub 3} scale. A general model for carbonate scale deposition in a wellbore must make a simultaneous accounting for pressures of H{sub 2}O, CO{sub 2}, and two or three other gases plus salt effects on those pressures. In addition, the elevation of flash initiation must be accurately identified and combined with profiles of temperature, etc., in the 2-phase zone. Such a model has been developed and its principle features are described here, including calibration of some factors with measured scale deposits. The model provides insight about the scale deposition processes through parametric studies. Tactics and strategies for confronting the effects of CaCO{sub 3} deposition in wells and wellfields can be explored with the model. Modeling of specific wellbores/wellfluids can help quantify risks and benefits concerning scale inhibition, wellfluid monitoring, timing of consequences relating to failure of scale inhibiting apparatus, urgency of remedial actions, and other aspects.

Physical Description

25-31

Source

  • Seventeenth Workshop on Geothermal Reservoir Engineering: Proceedings, Stanford University, Stanford, CA, January 29-31, 1992

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: SGP-TR-141-5
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 888649
  • Archival Resource Key: ark:/67531/metadc876156

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • January 1, 1992

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

Description Last Updated

  • Nov. 29, 2016, 8:20 p.m.

Usage Statistics

When was this article last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Michels, Donald E. Modeling CaCO{sub 3} deposition in geothermal wellbores, article, January 1, 1992; United States. (digital.library.unt.edu/ark:/67531/metadc876156/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.