APPLICATION OF NEW COMPOSITIONAL SIMULATION APPROACH. TO MODEL GRAVITY SEGREGATION IN VOLATILE OIL RESERVOIRS  

Oleh:

Syahrial, Ego

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Lemigas Scientific Contributions to Petroleum Science & Technology vol. 33 no. 03 (Dec. 2010), page 155.
Topik: Compositional; Equation of State; Gravity Segregation; Volatile

Ketersediaan

Perpustakaan PKPM Nomor Panggil: L15 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In this paper, we investigate the recovery performance of gas injection from volatile oil reservoirs. Cross-sectional reservoir studies for investigating the gravity segregation during depletion and gas cycling in volatile oil reservoirs is discussed. Furthermore the effects of vertical permeability on gravity segregation in a homogeneous and horizontal reservoirs are investigated. A new efficient compositional simulation approach was used in this study to investigate the influence of gravity segregation and their magnitude in the case of lean gas injection into a volatile oil reservoir. The new compositional simulation approach was validated through analytical and numerical methods, and it is unconditionally stable and as stable as fully compositional model. The results show that an increase in vertical to horizontal permeability ratios results in an increase in the effect of gravity segregation and yield early gas breakthrough. On the other hand, the smaller the permeability ratios (vertical to horizontal), better are the recoveries due to resulting even layer sweeps. Gravity forces have a considerable effect on volatile oil recovery via gas injection and the need for determining not only the fluid characteristics but also the reservoir heterogeneities was significant.

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