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Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling

A technology of flow simulation and analysis method, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as pipe flow and seepage coupling, and achieve the effect of reducing complexity

Active Publication Date: 2019-08-09
XIAN SINOLINE PETROLEUM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a flow simulation and transient well analysis method based on generalized pipe flow-seepage coupling, in order to overcome various complex pipe flow and seepage coupling problems in underground reservoirs

Method used

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  • Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling
  • Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling
  • Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] This embodiment provides a method for flow simulation and well testing analysis of pipeline-shaped reservoirs. The physical model assumptions corresponding to the pressure drop well testing model are as follows:

[0181] 1) The reservoir is composed of a single closed pipe-shaped reservoir (see figure 2 );

[0182] 2) In the initial state, the pressure in the reservoir is the original reservoir pressure;

[0183] 3) The flow of fluid inside the reservoir conforms to the law of linear flow;

[0184] 4) The fluid and rock in the reservoir are slightly compressible;

[0185] 5) The wellbore storage effect and the skin effect are not considered.

[0186] The dimensionless mathematical model corresponding to the pressure drop well test model is

[0187]

[0188] p D (x D ,t D =0) (2)

[0189]

[0190]

[0191] A dimensionless variable is defined as:

[0192]

[0193]

[0194]

[0195]

[0196] q D =q / q sc (9)

[0197] based on t D Laplace ...

Embodiment 2

[0205] This embodiment provides a method for flow simulation and well testing analysis of a cylindrical reservoir, and the physical model assumption corresponding to the pressure drop well testing model is:

[0206] 1) The reservoir is a cylindrical closed system, and the point source is located on the axis of the cylindrical reservoir (see Figure 6 );

[0207] 2) In the initial state, the pressure in the reservoir is the original reservoir pressure;

[0208] 3) The flow of fluid inside the reservoir complies with the law of linear flow;

[0209] 4) The fluid and rock in the reservoir are slightly compressible;

[0210] 5) The wellbore storage effect and the skin effect are not considered.

[0211] The dimensionless mathematical model corresponding to the pressure drop well test model is

[0212]

[0213] p D (r D ,z D ,t D =0) (13)

[0214]

[0215]

[0216]

[0217]

[0218] A dimensionless variable is defined as follows:

[0219]

[0220]

[...

Embodiment 3

[0248] This embodiment provides a method for flow simulation and well testing analysis of spherical reservoirs, and the physical model assumptions corresponding to the pressure drop well testing model are as follows:

[0249] 1) The reservoir is a spherical closed system, and the point source is located inside the spherical reservoir (see Figure 13 );

[0250] 2) In the initial state, the pressure in the reservoir is the original reservoir pressure;

[0251] 3) The flow of fluid inside the reservoir complies with the law of linear flow;

[0252] 4) The fluid and rock in the reservoir are slightly compressible;

[0253] 5) The wellbore storage effect and the skin effect are not considered.

[0254] The dimensionless mathematical model corresponding to the pressure drop well test model is

[0255]

[0256] p D (r D ,θ,t D =0)=0 (35)

[0257]

[0258]

[0259] A dimensionless variable is defined as:

[0260]

[0261]

[0262]

[0263]

[0264]

...

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Abstract

The invention discloses a flow simulation and transient well analysis method based on generalized pipe flow seepage coupling. The flow simulation and transient well analysis method comprises the following steps of S1, introducing generalized fluidity, and establishing a fluid motion equation of generalized pipe flow-seepage coupling; S2, substituting the established fluid motion equation into a mass conservation equation, and establishing a corresponding reservoir control equation according to the specific shape of the reservoir; S3, establishing different flow simulation and transient well analysis models according to a pipe flow and seepage coupling system formed by the combination relation of different structural reservoirs and the combination relation of different wells and different reservoirs; and S4, forming corresponding application software by using the established different flow simulation and transient well analysis models. The method plays an important role in solving the problems of flow simulation, unstable well testing analysis, production data analysis, productivity well testing analysis, multi-well interference well testing analysis and continuous or permanent pressure and flow monitoring data analysis of wells of complex oil, gas and water reservoirs.

Description

technical field [0001] The invention relates to the field of underground oil, gas and water exploitation engineering, in particular to a flow simulation and transient well analysis method based on generalized pipe flow seepage coupling. Background technique [0002] Darcy's law was proposed by the French engineer Darcy through experiments in 1856. It has become the basic law of seepage mechanics because of its simple proportional linear function in form, clear physical concept, and convenient solution. It is widely used in underground hydraulics and underground oil and gas seepage mechanics. At present, most of the continuum theoretical models in well testing of oil, gas and water reservoirs are based on Darcy's law. However, some oil and gas reservoirs with large-scale flow channels and reservoirs, such as: the invalid injection-production circulation flow channel formed in the water flooding development of unconsolidated sandstone reservoirs, the rapid breakthrough flow c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20E21B41/00E21B2200/20E21B49/00Y02A10/40E21B47/138E21B47/26
Inventor 林加恩何辉韩章英
Owner XIAN SINOLINE PETROLEUM SCI & TECH CO LTD
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