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A 3D Gas and Water Simulator Considering Nonlinear Flow Behaviors for Abnormal High-Pressure Tight Gas Reservoirs

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Chemistry and Technology of Fuels and Oils Aims and scope

Fluid flow in tight gas reservoirs with abnormal high pressure presents nonlinear behaviors. A mathematical description of these behaviors is essential for establishing the flow model. In this study, a mathematical model is presented that describes the effect of threshold pressure gradient and rock deformation on gas flow parameters in a tight gas reservoir. A fully implicit 3D gas and water phase numerical model was derived using the finite difference method. Based on software engineering principles, a 3D gas and water simulator was developed, which can be used in research on nonlinear flow mechanisms and flow simulation in abnormal high-pressure gas reservoir. The simulator proved to be reliable through a comparison with a commercial simulator, and it was used successfully for prediction of gas production in the M reservoir.

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Acknowledgement

This work was financially supported by the National Science and Technology Major Project (2017ZX05013-005). The authors would also like to thank the reviewers and editors whose critical comment: were very helpful in preparing this article.

NOMENCLATURE

\( \overrightarrow{V} \) flow velocity in porous media, cm/s

P pressure, MPa

PD dimensionless pressure

Pi initial pressure, MPa

K permeability, mD

KD dimensionless permeability

Ki initial permeability, mD

Kr relative permeability, mD

μ viscosity of the fluid, mPa∙s

Φ velocity potential

λ threshold pressure gradient, MPa/m

ξ correction factor of non-Darcy flow with high velocity of gas flow, dimensionless

ϕ porosity

B volume factor, dimensionless

Q surface fluid rate per unit volume of rock, m3/d

S saturation

t time, s

\( {P}_g^0 \) reference pressure, MPa

ϕ0 porosity under conditions of reference pressure

Cr rock compressibility. MPa-1

Pcgw capillary pressure of gas and water, MPa

SUBSCRIPTS

l denotes a phase (gas or water)

g gas phase

w water phase

Author information

Authors and Affiliations

  1. State Rey Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China

    Guoqing Feng

  2. Production division of Henan oilfield company Sinopec, Nanyang, China

    Zheng Huang

  3. Fengcheng Oil Production Plant of Xinjiang Oilfield Company PetroChina, Raramay, China

    Haozhe Yang

Authors
  1. Guoqing Feng
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  2. Zheng Huang
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  3. Haozhe Yang
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Corresponding author

Correspondence to Guoqing Feng.

Additional information

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 1, pp. 40 — 46, January — February, 2020.

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Feng, G., Huang, Z. & Yang, H. A 3D Gas and Water Simulator Considering Nonlinear Flow Behaviors for Abnormal High-Pressure Tight Gas Reservoirs. Chem Technol Fuels Oils 56, 60–72 (2020). https://doi.org/10.1007/s10553-020-01111-z

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  • DOI: https://doi.org/10.1007/s10553-020-01111-z

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