Foamy-Oil Flow Characteristic Considering Relaxation Effects in Porous Media

Abstract:

The production of heavy oil reservoirs has present anomalous phenomena, in which simultaneous mixture flow of gas as very tiny bubbles entrained in heavy oil is observed in solution gas drive and natural gas huff and puff process. The foamy oil in viscosity fluid has strong mobility to lead to high production and high recovery. Flow properties in pseudo-single phase result in a new feature of reservoir performance. The objective of this paper is to investigate the foamy oil flow characteristic taking account of relaxation effects. Assumed to dual-component of the foamy oil, heavy oil component and tiny gas component, respectively, analytical formulas of the foamy oil flowing pressure distribution during the initial and later stage are derived by the mathematical analytical model of one dimensional unsteady boundary flow in porous media. The result compared with classical Newtonian fluid flow shows that relaxation effects on flowing pressure decrease slowly. By taking L Block formation and injection parameters as an example, the flowing pressure distribution at injection well and production well reveals that effective radius of the foamy oil and injection time have optimal value. Heavy oil component volume concentration is smaller, the greater the corresponding tiny gas volume concentration, i.e., the more foamy oil flow, the greater the pressure effective radius. Through analytical calculation, the injection parameters of natural gas huff and puff for heavy oil reservoirs are assessed. In the practice of heavy oil development, the relaxation effects on heavy oil flow in porous media should be reasonably utilized.

• Periodical: Applied Mechanics and Materials (Volume 318)
• Pages: 486-490
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.318.486
• Online since: May 2013
• Authors: Ju Hua Li, Rui Tang, Jun Xu, Tao Jiang
• Keywords: Flow Characteristic, Foamy Oil, Natural Gas Huff, Natural Gas Puff, Pressure Distribution, Relaxation Effects

References

[1] Shen C,Batycky J P. Some observations of mobility enhancement of heavy oils flowing through sand pack under solution gas drive, The 47th Annual Technology Conference Petroleum Society of CIM,Calgary,1996: 16-27.

DOI: 10.2118/96-27

[2] Smith G E. Fluid flow and sand production in heavy oil reservoirs under solution gas drive, SPE15094,(1988)

DOI: 10.2118/15094-pa

[3] Maini B B, Sarma H K, George A E. Significance of foamy oil behavior in primary production of heavy oils, Journal of Canadian petroleum technology, 1993, 32(9):50-56

DOI: 10.2118/93-09-07

[4] Sarma H,Maini B B. Role of solution gas in primary production of heavy oils, The Second Latin American Petroleum Engineering Conference,Caracas,1992: 77-88.

DOI: 10.2118/23631-ms

[5] Bora R. Cold production of heavy oil - an experimental investigation of foamy oil flow in porous media, Calgary: University of Calgary,1998: 12-38.

[6] Kraus W P,McCaffrey W J,Boyd G W. Pseudo –bubble point model for foamy oils, The 44th Annual Technology Conference Petroleum Society of CIM,Calgary,1993: CIM 93- 45.

DOI: 10.2118/93-45

[7] Guan, W.L, Wu, S.H., Zhao, J. Utilizing natural gas huff and puff to enhance production in heavy oil reservoir, SPE117335,(2008)

[8] Su Y L, Luan Zh an. Non-equilibrium effects on heavy oil flow in porous media, Journal of hydrodynamics,1998, 13(1):1-6

[9] Wang Y D, Li M H, Wen K Y, Study on mechanism and modeling of foam flow in porous media, Petroleum Drilling Techniques, 2010, 38(4):104-107

[10] Rinat Akhmetov et al., Heavy and high viscosity oil production, Petroleum Industry Press,(1990)

[11] Alvarez J M, Rivas H J, Ross en W R. Unified model for steady state foam behavior at high and low foam qualities, SPE Journal, 2001, 6( 3) : 325- 333

DOI: 10.2118/74141-pa

[12] Anthony R K, Tadeusz W P, Clayton J R. Mechanistic foam flow simulation in heterogeneous and multidimensional porous media, SPE Journal , 1997, 2( 4) : 511- 526

DOI: 10.2118/39102-pa