The paper presents experimental data and a predictive model for gas solubility in saline water in a wide range of temperature and salt concentration. Solubility of two important gases, methane and carbon dioxide, in aqueous electrolyte solutions of NaCl, KCl, CaCl2 and their mixtures, have been investigated. The Aasberg·Petersen gas solubility model has been improved and extended to lower temperatures, new salts, and mixed electrolyte solutions by using newly generated experimental data. The developed solubility model is able to calculate gas solubility in saline water within a temperature range of 260–400 K and at a full range of salt concentrations. The model predictions are compared with available experimental data and good agreement is demonstrated. The above improvement in gas solubility prediction also proved to give more reliable results in hydrate calculations for high soluble gases in the presence of electrolyte solutions.
Low 011 prices and the highly competitive nature of the world-wide 011 and gas Industry demand more efficient and cost effective design and operation in the offshore and subsea sectors. The use of extended gathering networks and transportation of unprocessed wellstreams are two attractive options which may have a major impact on the development of many marginal oil and gas fields In the North Sea. These subsea pipelines carry a number of potential mixtures of Ouids such as oil/gas with formation water. A major concern with these pipelines is the possibility of their blockage due to hydrate formation which can lead to serious operational and safety problems. Gas hydrates have been recently reviewed by Sloan (1990). Por efficient and economical pipeline design and operation, phase equilibria as well as the boundary of hydrate formation with and without salts and other chemical inhibitors must, therefore, be precisely known.
