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Method for inverting low permeability reservoir non-darcy flow rule by utilizing pressure monitoring data

A low-permeability reservoir and pressure monitoring technology, applied in oil development reservoir engineering, inversion of low-permeability reservoir non-Darcy seepage law field, can solve the problem that it is difficult to truly obtain seepage law

Active Publication Date: 2017-12-12
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The simulation experiments of the above existing flow laws are limited to the core scale, and it is difficult to truly obtain the seepage laws in the oil drainage range under the formation conditions

Method used

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  • Method for inverting low permeability reservoir non-darcy flow rule by utilizing pressure monitoring data
  • Method for inverting low permeability reservoir non-darcy flow rule by utilizing pressure monitoring data
  • Method for inverting low permeability reservoir non-darcy flow rule by utilizing pressure monitoring data

Examples

Experimental program
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Effect test

Embodiment 1

[0115] like figure 1 As shown, a method for inversion of non-Darcy flow law in low-permeability reservoirs using pressure monitoring data includes the following steps:

[0116] 101 Measure the change of the bottom hole pressure value of the oil well within a certain period of shut-in time, and obtain the relationship between the pressure difference and the shut-in time;

[0117] 102 preset the relationship between seepage velocity and pressure gradient and express it with a specific function;

[0118] 103. Determine the initial value of the parameters in the numerical solution model according to the logging, completion and microseismic data;

[0119] 104 Establishing a numerical solution model considering dynamic permeability, and calculating theoretical pressure values ​​according to initial values ​​of parameters;

[0120] 105 comparing the theoretical pressure with the measured pressure;

[0121] 106 judge whether both meet error requirement, if both meet error requireme...

Embodiment 2

[0175] like figure 1 As shown, a method for inversion of non-Darcy flow law in low-permeability reservoirs using pressure monitoring data includes the following steps:

[0176] 101 Measure the change of the bottom hole pressure value of the oil well within a certain period of shut-in time, and obtain the relationship between the pressure difference and the shut-in time;

[0177] 102 preset the relationship between seepage velocity and pressure gradient and express it with a specific function;

[0178] 103. Determine the initial value of the parameters in the numerical solution model according to the logging, completion and microseismic data;

[0179] 104 Establishing a numerical solution model considering dynamic permeability, and calculating theoretical pressure values ​​according to initial values ​​of parameters;

[0180] 105 comparing the theoretical pressure with the measured pressure;

[0181] 106 judge whether both meet error requirement, if both meet error requireme...

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Abstract

The invention provides a method for inverting a low permeability reservoir non-darcy flow rule by utilizing pressure monitoring data. The method comprises the following steps: measuring a bottom hole pressure value of an oil well in a period of shut-in time so as to obtain a relational value between a pressure difference and a time difference; presetting a relation between seepage velocity and pressure gradient and expressing by using a specific function; establishing and considering a mathematical model of a dynamic permeability change relationship in a default function, setting initial values of model parameters, and solving a relationship between a theoretical bottom hole pressure difference and the time difference according to a numerical model; comparing the relations between the bottom hole pressure difference and the time difference obtained by theoretical solution and actual measurement, and if the two relations meet error requirements, taking set reservoir parameters and the coefficient in the specific function as parameters obtained by interpretation during theoretical calculation; substituting the coefficient into the preset specific function, and drawing a permeability rule curve; normalizing the permeability rule curve of each well in the same block, and finally obtaining the in-situ low permeability non-darcy flow rule curve under the reservoir scale.

Description

technical field [0001] The invention relates to the technical field of oil development reservoir engineering, in particular to the field of inversion of non-Darcy seepage law in low-permeability reservoirs by using pressure test data. Background technique [0002] The seepage characteristics of low-permeability reservoirs are different from those of conventional reservoirs. The seepage law of conventional reservoirs satisfies Darcy's law, that is, the seepage velocity is proportional to the pressure gradient. However, there is a nonlinear relationship between the seepage velocity and the pressure gradient of the low-permeability reservoir fluid, which is specifically manifested in the presence of seepage characteristics such as threshold pressure gradient and dynamic permeability. A correct understanding of seepage laws under formation conditions plays an important role in guiding the effective development of low-permeability reservoirs. [0003] It is a commonly used metho...

Claims

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 程时清罗乐于海洋李鼎一
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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