Cristin-resultat-ID: 1398140
Sist endret: 23. februar 2017 13:24
NVI-rapporteringsår: 2016
Resultat
Vitenskapelig artikkel
2016

Models for Calcium Carbonate Precipitation in the Near-Well Zone by Degassing of CO2

Bidragsytere:
  • Magnus Wangen
  • Jan Sagen
  • Tor Bjørnstad
  • Harald Johansen og
  • Alban Jean-Rene Souche

Tidsskrift

Open Petroleum Engineering Journal
ISSN 1874-8341
e-ISSN 1874-8341
NVI-nivå 0

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2016
Publisert online: 2016
Trykket: 2016
Volum: 9
Sider: 178 - 194
Open Access

Importkilder

Scopus-ID: 2-s2.0-84992089843

Klassifisering

Vitenskapsdisipliner

Matematikk og naturvitenskap

Emneord

Mineralutfelling • CO2 avgassing • Modellering • Nærbrønnsområdet

Beskrivelse Beskrivelse

Tittel

Models for Calcium Carbonate Precipitation in the Near-Well Zone by Degassing of CO2

Sammendrag

Calcium carbonate scale formation is a well known problem for water producing wells. Although there are several types of scale forming processes, we investigate the case of calcium carbonate precipitation when the degassing of CO2 causes the calcium equilibrium concentration to decrease towards a production well. We study a simplified system of carbonate chemistry, which allows for analytical expressions for the porosity loss as a function of time. The precipitation process normally goes from flow-limited away from the well to precipitation-limited close to the well. We derive an expression that estimates the transition zone between these two regimes. Furthermore, we present analytical estimates for the porosity reduction at a given radius as a function of time, including an estimate for each of these precipitation regimes. These analytical results are tested against numerical solutions for the porosity loss, which account for the full set of equations of the model. The analytical models give an accurate estimate of the linear porosity reduction with time, until at least half the porosity is lost. Examples of scale formation are given for the two regimes. Reasonable values for the precipitation kinetics indicate that most production operations have a kinetics-limited regime close to the well. The models also show that this type of scale formation takes place very close to the wells, typically within a few well radii from the walls of the well.

Bidragsytere

Magnus Wangen

  • Tilknyttet:
    Forfatter
    ved Miljøvennlige industriprosesser ved Institutt for energiteknikk

Jan Sagen

  • Tilknyttet:
    Forfatter
    ved Strømningsteknikk ved Institutt for energiteknikk

Tor Bjørnstad

  • Tilknyttet:
    Forfatter
    ved Sporstoffteknologi ved Institutt for energiteknikk

Harald Johansen

  • Tilknyttet:
    Forfatter
    ved Material- og prosessteknologi ved Institutt for energiteknikk

Alban Jean-Rene Souche

  • Tilknyttet:
    Forfatter
    ved Miljøvennlige industriprosesser ved Institutt for energiteknikk
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