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Research Papers: Petroleum Engineering

Performance Evaluation of Gas Production With Consideration of Dynamic Capillary Pressure in Tight Sandstone Reservoirs

[+] Author and Article Information
Leng Tian

Petroleum Engineering College,
China University of Petroleum,
Beijing 102249, China;
Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina S4S 0A2, SK, Canada

Bo Feng, Daihong Gu, Xiaoxing Ren

Petroleum Engineering College,
China University of Petroleum,
Beijing 102249, China

Sixu Zheng

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina S4S 0A2, SK, Canada

Daoyong Yang

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina S4S 0A2, SK, Canada
e-mail: tony.yang@uregina.ca

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received May 25, 2018; final manuscript received August 24, 2018; published online October 4, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 141(2), 022902 (Oct 04, 2018) (17 pages) Paper No: JERT-18-1376; doi: 10.1115/1.4041410 History: Received May 25, 2018; Revised August 24, 2018

In this paper, a pragmatic and consistent framework has been developed and validated to accurately predict reservoir performance in tight sandstone reservoirs by coupling the dynamic capillary pressure with gas production models. Theoretically, the concept of pseudo-mobile water saturation, which is defined as the water saturation between irreducible water saturation and cutoff water saturation, is proposed to couple dynamic capillary pressure and stress-induced permeability to form an equation matrix that is solved by using the implicit pressure and explicit saturations (IMPES) method. Compared with the conventional methods, the newly developed model predicts a lower cumulative gas production but a higher reservoir pressure and a higher flowing bottomhole pressure at the end of the stable period. Physically, a higher gas production rate induces a greater dynamic capillary pressure, while both cutoff water saturation and stress-induced permeability impose a similar impact on the dynamic capillary pressure, though the corresponding degrees are varied. Due to the dynamic capillary pressure, pseudo-mobile water saturation controlled by the displacement pressure drop also affects the gas production. The higher the gas production rate is, the greater the effect of dynamic capillary pressure on the cumulative gas production, formation pressure, and flowing bottomhole pressure will be. By taking the dynamic capillary pressure into account, it can be more accurate to predict the performance of a gas reservoir and the length of stable production period, allowing for making more reasonable development schemes and thus improving the gas recovery in a tight sandstone reservoir.

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Figures

Grahic Jump Location
Fig. 1

Schematic diagram of water classification as a function of saturation

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Fig. 3

The flowchart of the IMPES method

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Fig. 4

Comparison of this study and numerical simulation

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Fig. 2

Block-centered grid

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Fig. 5

Measured gas and water relative permeabilities under different displacement pressure gradients: (a) Core T39-3 and (b) Core Z52-9

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Fig. 6

Gas and water relative permeability curves under maximum production pressure difference of 15 MPa

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Fig. 9

Formation pressure distribution at the end of the stable production period for (a) qg = 5000 Sm3/d, (b) qg = 10,000 Sm3/d, and (c) qg = 15,000 Sm3/d with and without pseudo-mobile water

Grahic Jump Location
Fig. 10

Formation pressure distribution at the end of the stable production period at (a) τ≠0 and (b) τ=0, respectively

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Fig. 11

Formation pressure distribution at the end of the stable production period for (a) αk≠0, and (b) αk=0, respectively

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Fig. 7

The experimental measurements and fitted curves of Swi, krgi, and Δp

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Fig. 8

Comparison for cumulative gas production at the end of the stable production period with and without pseudo-mobile water

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