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Method for determining stratum density of layer section of hole enlargement by using scale method of sound wave curve

A technology of formation density and diameter-expanding section, which is applied in the seismology for logging records, etc., can solve problems such as affecting the accuracy of the results, and achieve the effect of solving the inaccurate measurement of the formation density of the diameter-expanding section.

Inactive Publication Date: 2009-07-08
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

If any of the above parameters is not accurate enough, it will seriously affect the accuracy of the result

Method used

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  • Method for determining stratum density of layer section of hole enlargement by using scale method of sound wave curve
  • Method for determining stratum density of layer section of hole enlargement by using scale method of sound wave curve
  • Method for determining stratum density of layer section of hole enlargement by using scale method of sound wave curve

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Embodiment Construction

[0032] The method of the present invention will be further described in detail below through specific examples.

[0033] Original logging data: Depth in the data table is the logging depth record, CAL is the caliper logging value, Δt is the acoustic time difference logging value, is the density log value.

[0034] Step 1: Determine the expanding section and the non-expanding section. Select the drill bit diameter BS=8.5, ε=0.1, ζ=5.0, according to the judgment conditions of the expanding section and the non-expanding section, that is, when the wellbore diameter is CAL, the drill bit diameter is BS, and the error limit ε(ε >0), if |CAL-BS|≤ε at a certain depth point, it is a non-expanding point; otherwise, if |CAL-BS|>ε, it is an expanding point, if the formation thickness of continuous expansion If it is greater than the given cut-off value ζ (ζ>=0), then this section of formation is considered to be an expansion section; if the continuous non-expansion formation thickness ...

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Abstract

The invention relates to a method for determining the formation density of an expanding section by using the acoustic wave curve calibration method. The method comprises the steps of: firstly determining the diameter-expanding layer section and the non-diameter-expanding layer section, then determining the scale factors b0 and b1, and then determining the formation density of the diameter-expanding layer section according to the scale factors b0 and b1. With this method, it is no longer necessary to select regional parameters, especially when the regional parameters cannot be accurately known, the formation density of the expansion zone can still be determined, and at the same time, it solves the problem that the density logging tool in the prior art cannot measure the expansion zone. The problem of ground density.

Description

technical field [0001] The invention relates to a method for determining the formation density of an expanding section by using the acoustic wave curve calibration method. Background technique [0002] Formation density is an indispensable and important parameter in the process of petroleum exploration and development. The existing method for determining the formation density of the expansion section includes the following six steps: [0003] Step 1: Determine the shale content; [0004] Step 2: Determine porosity; [0005] Step 3: Preliminarily determine the formation density according to the porosity and shale content; [0006] Step 4: Determine the expanded diameter formation section and the non-expanded diameter formation section; [0007] Step 5: Based on the measured value of the non-expanded interval and the formation density determined in Step 3, determine the scale factor b 0 and b 1 ; [0008] Step 6: According to the scale factor b 0 and b 1 , to determine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40
Inventor 李洪奇刘俊
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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