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Technique Overcomes Scarcity of Solubility Data in Scale Prediction for HP/HT Conditions

Accurate scale-prediction modeling is only possible when reliable mineral solubility data are available under the required conditions. It is recognized that the relative paucity of high-pressure/high-temperature (HP/HT) solubility data can result in inaccurate predictions because current models extrapolate from data obtained under more conventional conditions. The complete paper describes the generation of additional fundamental solubility data under HP/HT conditions and comparison of the obtained values with several existing models.

Introduction

The limited availability of HP/HT mineral solubility data in simple brine conditions and the paucity of solubility data in complex brine systems means that existing scale-prediction models, including those used in conventional software in common industry use, are forced to extrapolate, resulting in inaccurate and potentially misleading predictions.

Efforts have been made in recent years to address this issue by generating additional solubility data under HP/HT conditions to allow improved models to be developed. It is apparent from the reported work, and comparisons with previous literature, that these measurements are not trivial and require detailed understanding, development, and validation to ensure that reliable measurements are obtained. However, full details, comparison, and verification of the various experimental methods used are rarely presented and discussed, particularly in older works. The experimental method used must demonstrate that equilibrium solubility has been reached, preferably in a reasonable laboratory time period. The complete paper discusses the experimental considerations that must be taken into account when generating HP/HT solubilities, and presents methods to confirm that true equilibrium conditions have been reached.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 193564, “Scale Prediction and Mineral Solubility Under HP/HT Conditions,” by David Nichols, Neil Goodwin, and Gordon Graham, SPE, Scaled Solutions, et al., prepared for the 2019 SPE International Conference on Oilfield Chemistry, Galveston, Texas, 8–9 April. The paper has not been peer reviewed.
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Technique Overcomes Scarcity of Solubility Data in Scale Prediction for HP/HT Conditions

01 March 2020

Volume: 72 | Issue: 3

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