Heavy Oil Characteristic Assessment for Field Facilities Selection Steam EOR: Case Study in Oman
- Ardian Nengkoda (Schlumberger) | Mohammad Hajri (Petroleum Development of Oman) | Hendrikus Reerink (Petroleum Development of Oman) | Henry Armstrong | Francis Chang
- Document ID
- Society of Petroleum Engineers
- SPE Project and Facilities Challenges Conference at METS, 13-16 February, Doha, Qatar
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
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- 767 since 2007
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Fluid characterization such assay composition, PVT and compatibility tendency are the most important issues in understanding the compositional behaviour identification and as an input for field facilities design and selection especially in steam EOR project for carbonate type of potential in Oman. The fluid characterization deals to addresses the following issues as such how many components should be used, how should the data be grouped and how should fluid description parameters be obtained and identified as early as possible to identify the major flow assurance issue across facilities. This paper discuss about integrated study and effective work flow to support the project Steam EOR facilities that cover 3 major facilities that are oil and gas processing, water treatment process and steam generation, each stages have been evaluated in correlation to identify a type of production chemical. As a result, the challenge of flow assurance issues are: heavy oil and water separation, H2S and CO2 generation from carbonate reservoir lead to corrosion and HSE, calcite scale, type of water treatment or desalination and steam quality management. The smart fluid characteristics assessment were mapped as a set of flowchart in identifying a critical physical or chemistry information, and determine the end fluid quality expectation, tolerance and economics. This paper demonstrate one example significance of fluid assessment for field development steam EOR project in Petroleum Development Oman, the concept are the real future vision for effective field facilities selection.
The X Field in Northern of Sultanate of Oman was first drilled in 1964, however; following tests in teh 3 wells the field was deemed non-commercial based on the high water cut and assumed high oil viscosity. 40 years later, with enhanced oil recovery strategies being pursued for heavy oil fields in the area, the structure was targeted by exploration as an EOR candidate like Figure 1. The hydrocarbon bearing layer is 30m thick and contains heavy oil (6800cp @ 50deg. C) with saturations varying between 80% and 20%, a low permeability matrix with limited fractures as Figure 2. Reservoir and several methods have to be trialled to find a suitable concept to develop the field in an economically robust way. The series of development study need to be conducted include cyclic steam injection (CSS), Thermal GOGD, SAGD or and solvent injection. A suitable concept has to be found and then matured such that it can be used to develop the field economically and efficiently.
Solid deposits such asphaltene and wax are common phenomena in many oil fields around the world, especially on heavy oil type Enhance Oil Recovery (EOR) production. As the produced fluid combined with the change of pressure and temperature especially in thermal EOR, from the reservoir to the production facilities can create deposits of waxes, scale and asphaltenes or other type of organic/ inorganic solids.
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