Productions of volatile oil and gas-condensate from liquid rich shales

Palash Panja, Manas Pathak, Milind Deo

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Abstract


The growth in productions of liquid hydrocarbons from tight formations (shales) has been phenomenal in recent years. During the production of liquids (oil and condensate), large amounts of associated gas are also produced. The economic viability of a producing well depends on maintaining a reasonable proportion of liquid. The compositions and state of reservoir fluid play an important role in producing liquids from tight formations or shales in the USA such as Eagle Ford in Texas, Niobrara in Wyoming-Colorado, and Bakken in North Dakota. Small deviation in reservoir temperature around the critical point changes the state of the fluid (volatile oil or condensate) and as a result, the production of liquid is affected. Impacts of the state of the fluid (volatile oil or condensate), reservoir permeability and operating conditions on ultimate recoveries and produced gas liquid ratio are studied here. Five different reservoir fluids representing low to high liquid hydrocarbon contents are considered. Around 2% increment in condensate recovery after 10 years of production is observed from 100 nD permeability reservoir filled with the richest fluid (fluid 5) when the well is operated at 3000 psia compared to 1000 psia. At the same conditions, 9.3% more condensate is recovered for the leanest fluid (fluid 1). Therefore, operating the well at higher flowing bottom hole pressure (BHP) maximized the liquid recoveries of volatile oils and condensates in case of low permeability reservoirs (100 nD). However, in case of higher permeability (1000 nD) reservoir, lower operating pressure was preferable to increase the recovery. Conclusively, bottom hole pressure has less impact on the richer fluids and higher permeability reservoir. Operating well at higher BHP (3000 psia) also suppresses the production of gas and relatively enhances the production of liquid. Liquid to gas ratio (LGR) declines more rapidly for 100 nD permeability reservoirs compared to 1000 nD at BHP of 1000 psia. High fracture permeability (1000mD and above) appeared to negatively affect liquid recoveries at higher BHP resulting in reduction of recovery by around 2%. An optimum fracture permeability may be necessary based on reservoir permeability, operating pressure and type of fluid.

Cited as: Panja, P., Pathak, M., Deo, M. Productions of volatile oil and gas-condensate from liquid rich shales. Advances in Geo-Energy Research, 2019, 3(1): 29-42, doi: 10.26804/ager.2019.01.02


Keywords


Volatile oil, gas-condensate, critical temperature, liquid recovery, production optimization

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References


Akin, S., Castanier, L.M., Brigham, W.E. Effect of temperature on heavy oil/water relative permeabilities. Paper SPE 49021 Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, USA, 27-30 September, 1998.

Amin Gherabati, S., Browning, J., Male, F., et al. The impact of pressure and fluid property variation on well performance of liquid-rich Eagle Ford shale. J. Nat. Gas Sci. Eng. 2016, 33: 1056-1068.

Bagci, S., Castro, L., Flores, J. Optimization of hydraulic fracturing and production enhancement: Case studies for us shale plays and tight sand reservoirs. Paper SPE 185773 Presented at the SPE Europec Featured at 79th EAGE Conference and Exhibition, Paris, France, 12-15 June, 2017.

Ghanizadeh, A., Clarkson, C.R., Song, C., et al. Controls on liquid hydrocarbon permeability of tight oil and liquid-rich gas reservoirs: Examples from Bakken and Montney formations (Canada). Paper AAPG 2902898 Presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, Houston, Texas, USA, 23-25 July, 2018.

Khoshghadam, M., Khanal, A., Lee, W.J. Numerical study of impact of nano-pores on gas-oil ratio and production mechanisms in liquid-rich shale oil reservoirs. Paper SEG 2154191 Presented at the Unconventional Resources Technology Conference, San Antonio, Texas, USA, 20-22 July, 2015.

Lei, G., Cheng N., Whitson, C.H. Liquid-rich shale versus conventional depletion performance. Paper SPE 167788 Presented at the SPE/EAGE European Unconventional Resources Conference and Exhibition, Vienna, Austria, 25-27 Feburary, 2014.

Levine, J.S. Prats, M. The calculated performance of solution-gas-drive reservoirs. SPE J. 1961, 1(3): 142-152.

Lu, Q. Unconventional reservoir perforating cluster spacing optimization method for staged-fracturing horizontal well. Paper SPE 184483 Presented at the SPE Annual Technical Conference and Exhibition, Dubai, UAE, 26-28 Semptember, 2016.

Neshat, S.S., Okuno, R., Pope, G.A. Simulation of water and condensate blockage and solvent treatments in tight formations using coupled three-phase flash and capillary pressure models. Paper SPE190242 Presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, USA, 14-18 April, 2018.

Orangi, A., Nagarajan, N.R., Honarpour, M.M., et al. Unconventional shale oil and gas-condensate reservoir production, impact of rock, fluid, and hydraulic fractures, Paper SPE 140536 Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA, 24-26 January, 2011.

Panja, P., Conner, T., Deo, M. Grid sensitivity studies in hydraulically fractured low permeability reservoirs. J. Pet. Sci. Eng. 2013, 112: 78-87.

Panja, P., Conner, T., Deo, M. Factors controlling production in hydraulically fractured low permeability oil reservoirs. Int. J. Oil. Gas Coal Technol. 2016, 13(1): 1-18.

Panja, P., Deo, M. Factors that control condensate production from shales: Surrogate reservoir models and uncertainty analysis. SPE Reserv. Eval. Eng. 2016a, 19(1): 130-141.

Panja, P., Deo, M. Unusual behavior of produced gas oil ratio in low permeability fractured reservoirs. J. Pet. Sci. Eng. 2016b, 144: 76-83.

Pathak, M., Deo, M., Craig, J., et al. Geologic controls on production of shale play resources: Case of the Eagle Ford, Bakken and Niobrara. Paper SEG 1922781 Presented at the Unconventional Resources Technology Conference, Denver, Colorado, USA, 25-27 August, 2014.

Railroad Commission. Eagle Ford shale information. Texas Railroad Commission, 2016.

Robinson, D.B., Peng, D.Y. The characterization of the heptanes and heavier fractions for the GPA Peng-Robinson programs. GPA RR-28-1978.

Sanaei, A., Jamili, A., Callard, J. Optimum fracture spacing in the eagle ford gas condensate window. Paper SEG 1922964 Persented at the Unconventional Resources Technology Conference, Denver, Colorado, USA, 25-27 August, 2014.

Sharif, M.D.A., Nagalakshmi, N.V.R., Reddy, S.S., et al. Advance technique to increase production from tight formations using HiWAY Flow-Channel Hydraulic Fracturing Technique. J. Adv. Chem. Eng. 2017, 7(1): 1000165.

Siripatrachai, N., Ertekin, T., Johns, R.T. Compositional simulation of hydraulically fractured tight formation considering the effect of capillary pressure on phase behavior. SPE J. 2017, 22(4): 1046-1063.

Wang, M., Chen, S., Lin, M. Enhancing recovery and sensi-tivity studies in an unconventional tight gas condensate reservoir. Pet. Sci. 2018, 15(2): 305-318.

Whitson, C.H., Sunjerga, S. PVT in liquid-rich shale reser-voirs. Paper SPE 155499 Presented at the SPE Annual Technical Conference and Exhibition, San Antonio, Texas, USA, 8-10 October, 2012.


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