Method of calculating stratum true conductivity by using well axis electric field distribution

A technology of electric field distribution and true conductivity, which is applied in the direction of electric/magnetic detection for logging records, etc., to achieve the effect of high calculation efficiency, simple method and good accuracy

Inactive Publication Date: 2017-05-10
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is no longer able to meet the needs of the current technical conditions. It is necessary to discuss the relationship between the induced electromo

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of calculating stratum true conductivity by using well axis electric field distribution
  • Method of calculating stratum true conductivity by using well axis electric field distribution
  • Method of calculating stratum true conductivity by using well axis electric field distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0047] A method of obtaining the true conductivity of the formation with the electric field distribution of the shaft axis of the present invention comprises the following steps:

[0048] 1. Measure the distribution of electric field intensity along the well axis;

[0049] 2. Convert the electric field intensity distribution into an apparent conductivity function;

[0050] 3. Wellbore calibration for apparent conductivity function;

[0051] 4. Select the true conductivity of the formation from the corrected apparent conductivity function value of the borehole.

[0052] Specifically, in the step 1, the derivation method of the electric field intensity distributed along the well axis in the borehole is as follows:

[0053] Green's formula in vector

[0054]

[0055] Among them, the gradi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method of calculating stratum true conductivity by using well axis electric field distribution, which is simple and effective. The electric field distribution is generated by a transmitting coil after gradual moving of devices, and apparent conductivity distribution is acquired by a plurality of receiving coils, and requirements under conventional technical conditions are satisfied. The method comprises steps that step 1, electric field intensity distribution is measured along a well axis in a wellbore; every time a well logging device moves to a field point, the corresponding electric field distribution is measured; step 2, the measured electric field intensity distribution is converted into an apparent conductivity function; step 3, the apparent conductivity function is used for wellbore correction; step 4, a correct function value is selected from apparent conductivity function values after the wellbore correction, and the stratum true conductivity is acquired. By adopting the brand new induced electric field well logging method principle, the stratum true conductivity is calculated, and therefore the method is simple, calculation efficiency is high, and accuracy is good.

Description

technical field [0001] The invention relates to the technical field of well logging, in particular to a method for calculating the true conductivity of formations by using the electric field distribution of the well axis. Background technique [0002] In the field of petroleum engineering, the true conductivity of the formation is an important physical parameter for identifying oil and gas layers. The actual formation is a heterogeneous medium, and the potential (true conductivity) cannot be obtained by directly solving Maxwell's equations. Therefore, an engineering quantity—the apparent conductivity—is introduced to describe its electrical characteristics. The apparent conductivity is considered to be the weighted average of the formation conductivity, and the weighting coefficient is considered to be a geometric factor that has nothing to do with the formation. For decades, a great deal of work has been done on the relationship between apparent and true conductivity. One...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01V3/28
CPCG01V3/28
Inventor 李剑浩
Owner BC P INC CHINA NAT PETROLEUM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap