Sains Malaysiana 44(10)(2015): 1407–1415
Comparative
Analysis of Relative Permeability Models with Reference to Extreme Saturation
Limit and Its Influence on Reservoir Performance Prediction
(Analisis
Perbandingan Model Ketelusan Bandingan dengan Merujuk kepada Had Tepu Melampau dan
Pengaruhnya terhadap Jangkaan Prestasi Takungan)
MUHAMMAD KHURRAM ZAHOOR*
Department
of Petroleum and Gas Engineering, University of Engineering and
Technology, Lahore
Pakistan
Diserahkan: 30 November
2013/Diterima 24 Ogos 2015
ABSTRACT
A number of relative permeability
models were present in the literature, which were used to generate relative
permeability data for the fluids, present in the porous medium. Some models
were more significant to reservoir geology and displacement system (imbibitions
and drainage system), while developing the correlations. Similarly, the same is
kept in mind while performing reservoir studies. Therefore, in this study
different models based on displacement system and formation geology have been compared,
while including the effect of fluid saturation distribution/end point
saturation in a reservoir. The generated relative permeability data by using
these models have been further used to predict the reservoir performance for
gas and water-displacement systems. The results based on this study showed that
at lower saturations of displacing fluid (gas and/or water), the generated
reservoir performance curves based on relative permeability data generated by
using Corey and Wylie and Gardner models, gives higher degree of deviation on
comparative basis. The behavior of these error or deviation curves for
displacing phase is opposite in case of gas and water-oil displacement systems.
While in case of displaced phase (oil), generally analogous behavior can be
observed for both systems in terms of deviation/ error profiles trends. These
reservoir performance curve(s) are of utmost significance in developing
reservoir in an appropriate manner and a slight variation in relative
permeability data can have a significant impact at macroscopic level.
Keywords: Performance prediction;
relative permeability data; saturation variation effect
ABSTRAK
Beberapa
model ketelusan bandingan sedia ada yang digunakan untuk menjana data ketelusan
bandingan untuk cecair, hadir dalam medium berliang. Sesetengah model berkepentingan kepada takungan geologi dan anjakan
sistem (pemedapan dan sistem saliran) dalam membangunkan korelasi. Begitu juga, perkara yang sama perlu difikirkan semasa
menjalankan kajian takungan. Oleh yang demikian, dalam kajian ini model yang
berbeza berdasarkan kepada anjakan sistem dan pembentukan geologi telah
dibandingkan dengan mengambil kira kesan pengagihan cecair tepu/titik akhir
tepu di dalam takungan. Data ketertelapan relatif yang dijana menggunakan
model-model ini seterusnya digunakan untuk meramalkan prestasi takungan untuk
sistem gas dan air-anjakan. Hasil kajian ini menunjukkan bahawa pada penepuan
anjakan bendalir (gas dan/atau air) yang lebih rendah, lengkung prestasi
takungan yang dijana berdasarkan data ketelusan bandingan menggunakan model
Corey dan Wylie & Gardner, memberi darjah sisihan piawai lebih tinggi
secara perbandingan. Tingkah laku kesilapan ini atau lengkung
sisihan bagi fasa anjakan adalah bertentangan dalam kes sistem gas dan anjakan
air-minyak. Manakala dalam kes fasa anjakan (minyak),
secara umumnya tingkah laku analog boleh diperhatikan bagi kedua-dua sistem
daripada segi trend sisihan/ profil ralat. Prestasi
lengkungan takungan ini adalah amat penting dalam membangunkan takungan dengan
cara yang betul dan sedikit perbezaan dalam data ketertelapan relatif boleh
mempunyai kesan yang ketara pada peringkat makroskopik.
Kata
kunci: Data kadar resapan yang relatif; jangkaan
prestasi; kesan perubahan tepu
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*Pengarang untuk surat-menyurat; email: mkzahoor@yahoo.com
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