Wax precipitation is one flow assurance problem in production from the oil and gas system. Its problems cause many production problems in reservoirs, near wellbores, production tubing, surface flow lines, and surface facilities that lead to more frequent shutdowns, operational problems, and high costs for cleaning. This study aims to proactively predict the temperature at which wax may precipitate and forecast the wax deposition envelope (WDE) and the probability that it will occur; this study attempts to build a thermodynamic model that provides an accurate indication of the temperature at which wax precipitation occurs. The study focuses on temperature because wax crystals depend significantly on temperature change rather than other factors. Solid-liquid equilibrium (Coutenho Framework) which are couple between SRK-EOS and Wilson equation, has been used to simulate the wax phase envelope and wax appearance temperature. which are coupled between SRK-EOS and Wilson equation. In this study, wax moves from a liquid to a solid state when it reaches 138.5°C, which represents the wax appearance temperature (WAT) at which the solid phase begins to develop. Continued temperature decrease below this threshold results in wax release as solid crystals and accompanying production issues. Testing the well's operating conditions on the phase diagram revealed a significant probability of wax production, especially at the wellhead and surface equipment. The primary conclusion is that the couple model may be utilized to predict wax with acceptable precision, which improves with the availability of accurate laboratory data.
Mohammed A. Ahmed (Wed,) studied this question.