Non-Uniqueness of Adsorption Isotherm History Matching in Squeeze Treatments

Vahid Azari, Oscar Vazquez, Hendra Kuncoro, Eric Mackay

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

Abstract

After squeezing the well with scale inhibitor, field samples are normally collected from the produced brine to monitor the squeeze treatment lifetime, resulting in a return concentration profile. This profile is typically used to derive a field-representative isotherm by history matching the return concentration data. This field isotherm is then used to predict the lifetime and to optimize the subsequent treatments in the well. However, isotherm history matching is an inverse problem, and its solution might be non-unique. Hence, multiple isotherms may be identified that satisfy the data-match criteria reasonably well, causing prediction uncertainty for the next squeeze treatments. Ignoring this feature and selecting just one single isotherm out of a whole range of the plausible solutions may result in a poor-quality lifetime prediction based on the model. The main objective in this work is to evaluate the non-uniqueness of the isotherm history matching and to illustrate its effect on designing the subsequent treatments. Four synthetic cases were considered, and the SI concentration return profile was produced for each case to demonstrate the non-uniqueness nature of the problem. Moreover, to represent the field conditions more closely, randomly generated synthetic noise was also added to the profiles. In practice, the noise may come from the errors in sampling/analyzing or from the reservoir heterogeneity. A real field case was also considered with the field data available for two subsequent squeeze treatments. A sensitivity study was conducted to show the degree of uncertainty in the lifetime prediction for a variety range of squeeze designs, using several isotherms matching the return profile. The systematic method proposed in this manuscript assists in the isotherm history matching, leading to a more accurate squeeze lifetime prediction.

Original languageEnglish
Title of host publicationSPE International Oilfield Scale Conference and Exhibition 2022
PublisherSociety of Petroleum Engineers
ISBN (Electronic)9781613998588
DOIs
Publication statusPublished - 25 May 2022
Event2022 SPE International Oilfield Scale Conference and Exhibition - Aberdeen, United Kingdom
Duration: 25 May 202226 May 2022

Conference

Conference2022 SPE International Oilfield Scale Conference and Exhibition
Abbreviated titleOSS 2022
Country/TerritoryUnited Kingdom
CityAberdeen
Period25/05/2226/05/22

Keywords

  • Adsorption Isotherm Matching
  • Oilfield Scales
  • Scale Inhibitor Squeeze Treatment
  • Squeeze Lifetime Prediction
  • Uncertainty Quantification

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Energy Engineering and Power Technology

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