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Crack flow conductivity test method

A technology of conductivity and testing method, which is applied in the direction of earthwork drilling and production, wellbore/well parts, etc., can solve problems such as shortage, and achieve the effect of simple production and reliable principle

Inactive Publication Date: 2015-07-01
PETROCHINA CO LTD
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Problems solved by technology

[0006] In order to solve the problem that the current laboratory research on volume fracturing of unconventional oil and gas reservoirs lacks the test method of the main and branch fracture conductivity of different fracture widths in complex fracture networks and the laboratory research method of the matching relationship between the main and branch fracture conductivity, a new method is proposed. A test method for the conductivity of "variable fracture width, fracture corner support, and fracture width combination" suitable for complex fracture network conditions

Method used

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Embodiment Construction

[0028] The following describes the technical means adopted by the present invention to achieve the intended purpose of the invention in conjunction with the drawings and preferred embodiments of the present invention.

[0029] figure 1 It is a flowchart of a method for testing fracture conductivity of an embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0030] Step 1. Calculate the fracture width combination under the fracture network system according to the reservoir characteristics;

[0031] Step 2: Make a diversion channel model according to the fracture type and the combination of the fracture width;

[0032] Step 3: Use the diversion groove model to conduct a conductivity test experiment, and obtain the fracture conductivity through the conductivity evaluation method.

[0033] In step 1, the formula used to calculate the crack width is as follows:

[0034] w f = 6 μQL P net h f 3 ; - - - ( 1 ) ...

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Abstract

The invention discloses a crack flow conductivity test method. The crack flow conductivity test method comprises the steps that firstly, a crack width combination under a crack network system is calculated according to characteristics of a reservoir stratum; secondly, a diversion trench model is manufactured according to a crack type and the crack width combination; thirdly, a flow conductivity test experiment is conducted by utilizing the diversion trench model, and therefore the crack flow conductivity is obtained through tests based on a flow conductivity evaluation method. The crack flow conductivity test method is reliable in principle, enables the crack width combination, a crack corner support and a complex crack network steel plate model to be manufactured simply, can really reflect the flow conductivity of different crack widths, the crack corner support and a complex crack network and the matching relation of the flow conductivity of the different crack widths, and provides a basis for reservoir numerical simulation data optimization.

Description

Technical field [0001] The invention relates to an indoor test and evaluation method for the conductivity of complex fracture networks formed by volume fracturing during the development of oil and gas fields, in particular to a method for testing the conductivity of fractures. Background technique [0002] More than 70% of PetroChina’s newly added reserves in recent years belong to low-permeability reservoirs, which are difficult to produce and have poor development benefits. Especially for unconventional oil and gas reservoirs (shale gas, tight oil), if the target reservoir has the characteristics of strong brittleness, natural fractures and bedding, and small horizontal stress difference, the reservoir can be "broken" through volume transformation Increasing the reservoir reconstruction volume, forming "artificial permeability", improving reservoir permeability and connectivity, reducing seepage resistance and driving pressure difference, can achieve a more ideal reconstruction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 段贵府胥云才博卢拥军蒙传幼王欣何春明管保山
Owner PETROCHINA CO LTD
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