### Numerical Simulation of Dry Gas Migration in Condensate Gas Reservoir

Y. Sun, W.Y. Zhu, B.Z. Li, J. Xia, Y.W. Jiao, K. Huang

#### Abstract

Dry gas overlies on condensate gases and flows due to the difference in density. This phenomenon affects cyclic injection
exploitation and increases production costs. A mathematical model of dry gas migration was developed in this study to
investigate the migration characteristics and the overlying law for dry gas in the condensate gas reservoir. On the basis of the
theory of convection diffusion, the governing equations were constructed, using dry and condensate gases as two pseudocomponents.
The distribution and transition belt of dry gas, as well as the effects of condensate oil and the perforation method
on overlying of dry gas were discussed based on the dry gas migration model. The results demonstrate that the width of the
transition belt of dry and condensate gases increases gradually over time. The mole fraction of gas in the transition belt is
dense in the middle, but sparse at the two ends. The overlying of dry gas is easy, taking condensate oil into consideration. The
value of F increases by 0.32, but the width of the transition belt becomes narrow. The transition belt under the top perforation
of the reservoir is wider than that under symmetric perforation, and the overlying degree of dry gas increases. This study
provides a theoretical foundation for in situ adjustment and optimization of cyclic gas injection utilization.

PDF

#### References

K. Jessen, F. Orr, Gas cycling and the development of miscibility in

condensate reservoirs, SPE Reservoir Evaluation & Engineering 7 (05)

(2004) 334–341.

M. Sadooni, A. Zonnouri, The effect of nitrogen injection on production

improvement in an iranian rich gas condensate reservoir, Petroleum

Science and Technology 33 (4) (2015) 422–429.

M. Nasiri Ghiri, H. R. Nasriani, M. Sinaei, S. Najibi, E. Nasriani, H. Parchami,

Gas injection for enhancement of condensate recovery in a gas

condensate reservoir, Energy Sources, Part A: Recovery, Utilization,

and Environmental Effects 37 (8) (2015) 799–806.

J. T. Linderman, F. S. Al-Jenaibi, S. G. Ghori, K. Putney, J. Lawrence,

M. Gallat, K. Hohensee, et al., Feasibility study of substituting nitrogen

for hydrocarbon in a gas recycle condensate reservoir, in: Abu

Dhabi International Petroleum Exhibition and Conference, Society of

Petroleum Engineers, 2008.

P. GUO, S.-l. LI, L. SUN, L.-t. SUN, Effect of different injection gas on

condensate gas phase state [j], Xinjiang Petroleum Geology 3 (2001)

L. Yuguan, Adjustment measures of circulating gas injection in kekeya

condensate gas field in xinjiang province and its development effectiveness,

Natural Gas Industry 20 (4) (2000) 61–62.

Y. Shenglai, C. Hao, F. Jilei, et al., A brief discussion on some scientific

issues to improve oil displacement during gas injection, tarim oilfield,

Petroleum Geology and Recovery Efficiency 21 (1) (2014) 40–44.

W. Zhu, F. Zhang, M. Tang, H. Wang, Methods of cyclic gas injection

to retard gas channeling in the yaha condensate gas field, Natural Gas

Industry 28 (10) (2008) 76–77.

Y. Yong, W. Helin, Y. Yunfu, W. Jianfu, Z. Xidong, Z. Guowang, C. Aibing,

Application of mdt logging technology in accurate identification of

knotty oil and gas layers, China Petroleum Exploration 11 (5) (2006)

–57.

Z. Y. Abbasov, V. M. Fataliyev, The effect of gas-condensate reservoir

depletion stages on gas injection and the importance of the aerosol

state of fluids in this process, Journal of Natural Gas Science and Engineering

(2016) 779–790.

N. Hamidov, V. Fataliyev, Experimental study into the effectiveness of

the partial gas cycling process in the gas-condensate reservoir development,

Petroleum Science and Technology 34 (7) (2016) 677–684.

K. Luo, T. Zhong, A discussion on the layering of near-critical gas condensate

in pvt cell, Petroleum Exploration and Development 26 (1999)

–70.

L. Ayala, T. Ertekin, M. Adewumi, Compositional modeling of retrograde

gas-condensate reservoirs in multimechanistic flow domains.

spej 11 (4): 480–487, Tech. rep., SPE-94856-PA. DOI: 10.2118/94856-

PA (2006).

S. Jun, The study and application of numerical simulation and phase

analyses to condensate gas reservoir, Natural Gas Exploration & Development

(1) (2004) 39–45.

Z. Long, L. Cheng, A pseudo-three dimensional compositional model,

Journal of the University of Petroleum, China 14 (1) (1990) 16–25.

H. Adel, D. Tiab, T. Zhu, et al., Effect of gas recycling on the enhancement

of condensate recovery, case study: Hassi r’mel south field, algeria,

in: International Oil Conference and Exhibition in Mexico, Society

of Petroleum Engineers, 2006.

L. Shilun, S. Lei, G. Ping, Re-discussion of eor with gas injection in

china, Natural Gas Industry 26 (12) (2006) 30–34.

G. Ping, J. Shasha, P. Caizhen, Technology and countermeasures for

gas recovery enhancement, Natural Gas Industry 34 (2) (2014) 48–55.

W. Rossen, C. Van Duijn, Gravity segregation in steady-state horizontal

flow in homogeneous reservoirs, Journal of Petroleum Science and

Engineering 43 (1-2) (2004) 99–111.

M. Jamshidnezhad, T. Ghazvian, Analytical modeling for gravity segregation

in gas improved oil recovery of tilted reservoirs, Transport in

Porous Media 86 (3) (2011) 695–704.

J. Huo, Y. Jia, J. Yu, et al., Well test method in heavy oil thermal

recovery with consideration of gravity override, Journal of Southwest

Petroleum Institute 28 (2) (2006) 52–55.

Y. Jiao, B. Li, Z. X. Wang Bo, N. Chen, Research on mechanisms of

cycling reinjection in gas-condensate reservoir, Xinjiang Oil & Gas 6

(2010) 63–66.

Y. Zhao, Z. Jiang, S. Ge, et al., On gas injection monitoring by downhole

fluids composition analysis, Well Logging Technology 39 (2015)

–383.

L. Zhang, W. Xie, J. Yang, et al., Gravity segregation of the cyclic

gas injection in the condensate gas reservoirs in the middle and late

development stages, Petroleum Geology and Oilfield Development in

Daqing 35 (2016) 120–125.

H. R. Nasriani, E. Asadi, M. Nasiri, L. Khajenoori, M. Masihi, Challenges

of fluid phase behavior modeling in iranian retrograde gas condensate

reservoirs, Energy Sources, Part A: Recovery, Utilization, and

Environmental Effects 37 (6) (2015) 663–669.

P. Guo, H. Xu, Z. Wang, et al., Calculation of multi-component gas-gas

diffusion coefficient, Natural Gas Industry 35 (8) (2015) 39–43.

R. Krishna, A generalized film model for mass transfer in non-ideal fluid

mixtures, Chemical Engineering Science 32 (6) (1977) 659–667.

R. Krishna, J. Wesselingh, The maxwell-stefan approach to mass

transfer, Chemical Engineering Science 52 (6) (1997) 861–911.

G. W. Z. H. L. Zeng, Y. T. Wen-Quan, The simulation of mass transfer

processes of multi-component systems by maxwell-stefan model [j],

Journal Of Engineering Thermophysics 4 (2012) 035.

K. Ghorayeb, A. Firoozabadi, Molecular, pressure, and thermal diffusion

in nonideal multicomponent mixtures, AIChE Journal 46 (5) (2000)

–891.

J. Monteagudo, A. Firoozabadi, Comparison of fully implicit and impes

formulations for simulation of water injection in fractured and unfractured

media, International journal for numerical methods in engineering

(4) (2007) 698–728.

H. S. Najafi, S. Edalatpanah, On the modified symmetric successive

over-relaxation method for augmented systems, Computational and

Applied Mathematics 34 (2) (2015) 607–617.

### Refbacks

• There are currently no refbacks.