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Establishment method of crack-pore dual-medium coupling permeability model

A dual-medium, method-building technology, applied in earth-moving drilling, 3D modeling, wellbore/well components, etc., which can solve the problems of permeability error, failure to consider the coupling effect of fracture and matrix seepage, and inaccurate reservoir evaluation. , to achieve the effect of reducing the calculation error and the application effect is remarkable

Pending Publication Date: 2019-06-14
BC P INC CHINA NAT PETROLEUM CORP +2
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Problems solved by technology

However, it is found through experiments that when the fracture opening is 10um, if the seepage coupling between the fracture and the rock matrix is ​​not considered, the calculated permeability results have an error of 25.1% relative to the actual permeability
Applying these theoretical models to logging interpretation will lead to inaccurate reservoir evaluation because the seepage coupling between fractures and matrix is ​​not considered

Method used

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  • Establishment method of crack-pore dual-medium coupling permeability model
  • Establishment method of crack-pore dual-medium coupling permeability model
  • Establishment method of crack-pore dual-medium coupling permeability model

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] A method for establishing a fracture-pore dual medium coupling permeability model, the construction steps are as follows:

[0047] The first step is to establish a 3D digital core of rock matrix with different pore structures

[0048] The ten carbonate rock cores selected in the target area were scanned by X-ray CT scanning method with a resolution of 2 μm. Filter processing, image segmentation and representative element volume an...

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Abstract

The invention discloses an establishment method of a crack-pore dual-medium coupling permeability model, which comprises the following construction steps of 1, establishing rock matrix three-dimensional digital rock cores with different pore structures; 2, establishing the flat plate crack models with different crack openness; step 3, establishing a crack-pore double-medium three-dimensional digital core; 4, calculating the permeability of the three-dimensional digital rock core model; and 5, constructing a crack-pore dual-medium coupling permeability model according to a permeability result obtained through calculation, so that the influence of the crack-pore dual-medium seepage coupling effect on the total permeability is solved, the crack-pore dual-medium coupling permeability can be accurately calculated, the assistance is provided for well logging evaluation of reservoirs and oilfield development, the actual application effect is remarkable, and the popularization value is high.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration well logging, in particular to a method for establishing a fracture-gap dual-medium coupling permeability model. Background technique [0002] With the continuous deepening of exploration and development, the types of newly proven oil reservoirs have become more and more complex in recent years, especially the proven reserves of fractured oil reservoirs have continued to increase. Due to the existence of natural fractures, fractured reservoirs constitute dual-media reservoirs. In exploration and development, the permeability parameters of dual-media reservoirs are of great significance to the evaluation and interpretation of the entire reservoir. [0003] The pore space of dual media is composed of primary intergranular pores and secondary fractures. The definition of permeability of dual media containing fractures is consistent with that of single porous media, but can be further re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05G06F17/50E21B49/02E21B49/00
Inventor 黄宏孙建孟张树东闫伟超王勇军李召成刘航熊宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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