Production well performance optimization in heavy crude oil carbonate reservoir Rx - Northern Iraqi oil field

• Main Authors: Mohammed, Omar. Q., Omar, Nashat. J.
• Format: Conference Proceeding
• Language: English
• Subjects: Casing; Crude oil; Heavy petroleum; Hydrogen sulfide; Oil fields; Optimization; Perforation; Reservoirs
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0091804

Tertiary carbonate reservoirs within heavy crude oil inside pores cover a wide area of the northern Iraqi part extended to include four oil fields located to the southeast of Mosul city. Well Performance, which is producing heavy oil crude from fractured-vuggy carbonate reservoir rock, needs to be analyzed and optimized properly. Therefore, this study came to optimize production well performance from this type of reservoirs for a long period using Nodal analysis®. Nodal analysis concept allows production engineer to determine if the stimulation will help, it allows to determine if the completion is optimized (optimizing tubing size and depth, perforations parameters). In addition to evaluate the impact of upgrading facilities (i.e. what is the benefit of lowering well backpressure or increasing injection pressure). It also allows to predict the abandonment pressure for the given well. In a simple single well system, oil and associated fluids move from the reservoir to the stock tank. Energy losses must be overcome in order for fluid to flow through various interconnected components from reservoir to the stock tank. Therefore, Nodal analysis® is a powerful tool that can help to predict when and which artificial lift technique should be used to overcome the energy losses within the system. In order to accomplish this study, data were collected from several wells producing from the tertiary carbonate reservoir of the same field. These data include completion data, deviation data, PVT data, well test data, wellhead pressure and temperature, SBHP, FBHP, BHT and IPR data. This study investigated the effect of tubing size, tubing setting depth inside casing on production well performance while reservoir pressure is changing with time. In addition, it compared different artificial lift techniques for optimum production performance from a well producing heavy crude oil with high percentage of H2S. The results showed that using 3 1/2 " OD tubing size is more suitable technically and economically. Furthermore, using PCP is a more suitable artificial lift technique than ESP as for these types of wells. This study can benefit the oil industry in Provision of optimum completion design for a well producing heavy crude from carbonate reservoirs and it introduces optimum artificial lift design suitable for a well producing heavy crude oil with high percentage of H2S.