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Method for converting dynamic and static permeability of micro-fracture-pore type reservoir

A conversion method and micro-fracture technology, which is applied in earthwork drilling, complex mathematical operations, measurement, etc., can solve the problem of difficult to accurately characterize the productivity of oil and gas reservoirs, poor correspondence, and the inability to know the dynamic permeability of micro-fracture-porous reservoirs and other issues, to achieve the effect of strong economy, improved accuracy and strong versatility

Pending Publication Date: 2020-12-29
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

In microfracture-porous reservoirs, due to the strong heterogeneity of the reservoir, there is a large difference between the static permeability and the dynamic permeability, and the corresponding relationship is poor, making it difficult for the static permeability to accurately represent the productivity of the oil and gas reservoir.
The dynamic permeability of microfracture-porous reservoirs cannot be known only by calculating the static permeability of microfracture-porous reservoirs in the prior art

Method used

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  • Method for converting dynamic and static permeability of micro-fracture-pore type reservoir
  • Method for converting dynamic and static permeability of micro-fracture-pore type reservoir
  • Method for converting dynamic and static permeability of micro-fracture-pore type reservoir

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Embodiment 1

[0068] Example 1: Take a microfracture-porosity reservoir M as an example.

[0069] 1) Based on the core samples of the micro-fracture-porous reservoir M at a certain depth in the formation, the micro-fractures developed in the core pillars and core slices were comprehensively analyzed, and it was concluded that the types of micro-fractures developed were mainly high-angle fractures, fractures The density of the micro-cracks is mainly distributed between 2-5, the width of the micro-cracks is about 0.02mm, and the extension length of the micro-cracks is about 1-2m ( figure 1 with figure 2 ).

[0070] 2) Use logging tools to collect electrical imaging and array acoustic logging data in the target interval of microfracture-porous reservoir M; based on the electrical imaging and array acoustic logging data collected in well A, analyze the core in step 1) The response characteristics of the type, density, width and extension length of micro-fractures developed on pillars and cor...

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Abstract

The invention provides a method for converting dynamic and static permeability of a micro-fracture-pore type reservoir. The method comprises the following steps: (1) determining the type and characteristics of developed micro-fractures; (2) processing and explaining logging data to obtain micro-fracture porosity; (3) establishing a function relationship between the effective porosity and the static permeability in each type of reservoir to obtain the static permeability of the whole well section; (4) obtaining the dynamic permeability of each well based on well testing or testing operation; (5) taking the size of the micro-fracture porosity as a classification standard, and distinguishing the types of the reservoirs; (6) respectively establishing a conversion relationship between the static permeability and the dynamic permeability; and (7) based on the conversion relationship, calculating the dynamic permeability in a well which cannot measure the dynamic permeability. According to the method for converting the dynamic and static permeability of the micro-fracture-pore type reservoir, an effective method with high universality and good economy is provided, and the method can be widely applied to conversion of the dynamic and static permeability of the micro-fracture-pore type reservoir.

Description

technical field [0001] The invention relates to a dynamic and static permeability conversion method of a reservoir, in particular to a dynamic and static permeability conversion method of a micro-crack-pore type reservoir. Background technique [0002] Permeability refers to the ability of rock to allow fluid to pass under a certain pressure difference. Static permeability is mainly obtained from the analysis data of petrophysical experiments or the interpretation results of logging data, and mainly reflects the seepage capacity of the reservoir when the fluid is in a static state. In general, the calculation of static permeability is mainly based on the high-precision functional relationship between porosity and permeability, and porosity is used to establish the calculation formula of static permeability. The dynamic permeability is mainly calculated based on data such as well testing and testing, and mainly reflects the seepage capacity of the rock when the fluid is in a...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/00G06F30/20G06F17/15G06F17/18G06F111/10
CPCE21B49/00E21B47/00G06F17/15G06F17/18
Inventor 李雄炎杜向东秦瑞宝魏丹平海涛曹景记刘小梅
Owner CHINA NAT OFFSHORE OIL CORP
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