Material selection for oil production processes based on actual Ecuadorian oil reserves characteristics

Nowadays, Ecuador's crude oil reservoirs contain heavier crude oil than those processed when production and processing facilities, such as oil fields exploration, pipelines, and refineries. The natural decline of reservoirs increases the water production, which significantly impacted reliability and operational continuity; therefore, the corrosion problems in all of the oilfield processes to the final product have increased. An adequate material selection and the chemical treatment usage have to be considered from the design steps, considering Sacha oilfield as the principal oilfield in Ecuador and its crude oil characteristics and its operational conditions to which the material will be subjected. For this study was necessary to analyze the possible corrosion problems that could present. Langelier model and Stiff-Davis model were used for scale formation determine, considering wellhead conditions, in which case were discarded based on the values obtained of -0.04 and 0,11 respectively. De waar-Milliams and De waard-Lotz models were used for CO₂ corrosion determine, in which case a pressure and temperature profile were developed and used in order to obtain the estimated values for each point of the production well. According to De waar-Milliams the corrosion rates varies from 1,25 mm/yr to 39,73 mm/yr and to De waard-Lotz it can varies from 4,40 mm/yr to 58,62 mm/yr; in both cases the values obtained represent an inminent operational problem, for this reason the use of a high-performance steel pipe is necessary to be considered. According to Material Selection Table propoused by Vera from DNV.GL with a CO₂ partial pressure in the order of 10² and a negligible H₂S partial pressure the material that is recommended to be used is 13-Chrome.

• Päätekijä: Bastidas González, Richard Nelson (author)
• Aineistotyyppi: bachelorThesis
• Kieli: eng
• Julkaistu: 2021
• Aiheet: Cloruros; Datos PVT; Métodos de producción; Integración subsuelo-superficie; Carga frontal; Chlorides; PVT data; Production methods; Subsurface-surface integration; Front end loading
• Linkit: http://repositorio.yachaytech.edu.ec/handle/123456789/380