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Electromagnetic propagation resistivity logging joint inversion method based on parallel computing technology

A technology of resistivity logging and parallel computing, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of poor calculation accuracy, inability to remove the comprehensive influence of non-linearity, and large workload of plate correction method, etc., to achieve The effect of improving the speed and accuracy of inversion calculation and reducing the complexity of inversion work

Inactive Publication Date: 2015-09-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned resistivity inversion method while drilling has the following disadvantages: (1) The plate correction method has a large workload, cumbersome steps, and poor accuracy, and cannot remove the comprehensive influence of the logging environment on the nonlinearity of the logging response; (2) Deconvolution Or the one-dimensional iterative inversion method is not suitable for the situation of mud invasion; (3) The accuracy of the fast inversion based on the logging response data depends on the richness of the inversion database. Due to the limited and discrete database, when the mud invasion is serious (4) The existing two-dimensional iterative inversion method, in order to obtain a faster calculation speed, adopts the analytical method (Green’s method), and the calculation accuracy is poor under large-scale irregular and complex models; (5) The existing inversion method uses part of the logging curve, which does not make full use of the logging information, and the inversion has obvious problems in the case of severe mud invasion. ill-posed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A combined inversion method for resistivity logging while drilling based on multi-core parallel computing, specifically comprising the following steps:

[0022] (1) Load 20 pieces of logging data of ARC675 resistivity logging while drilling in the 50m well section, among which the typical reservoir curve P16H is 8.8Ω·m, P40H is 11.8Ω·m, and A40H is 12.9Ω·m;

[0023] (2) Smooth filtering and automatic stratification of logging curves;

[0024] (3) According to the degree of separation of the curves, the invasion depth of the formation model, the resistivity of the invasion zone, and the initial value of the formation resistivity are selected;

[0025] (4) Using the finite element method, based on 8-core parallel computing technology, the computing task is divided into 8 threads, and the computing tasks are allocated to calculate the LWD resistivity response at the corresponding depth point of the measured curve. The well response is recycled to the main thread for mergi...

Embodiment 2

[0029] A joint inversion method for re-measurement data of resistivity logging while drilling based on multi-core parallel computing, which specifically includes the following steps:

[0030] (1) Load 20 pieces of well logging data re-measured after drilling in the 50m well section ARC675 resistivity logging while drilling in the same well section as in Example 1, in which the typical reservoir curve P16H is 3.2Ω·m, and P40H is 4.6 Ω·m, A40H is 9.5Ω·m;

[0031] (2) Smooth filtering and automatic stratification of logging curves;

[0032] (3) According to the degree of separation of the curves, the invasion depth of the formation model, the resistivity of the invasion zone, and the initial value of the formation resistivity are selected;

[0033] (4) Using the finite element method, based on 8-core parallel computing technology, the computing task is divided into 8 threads, and the computing tasks are allocated to calculate the LWD resistivity response at the corresponding dep...

Embodiment 3

[0037] A combined inversion method for resistivity logging while drilling based on GPU parallel computing, specifically comprising the following steps:

[0038] (1) A total of 20 logging data of ARC675 resistivity logging while drilling for a 50m well section were loaded, among which the typical reservoir curve P16H was 8.8Ω·m, P40H was 11.8Ω·m, and A40H was 12.9Ω·m;

[0039] (2) Smooth filtering and automatic stratification of logging curves;

[0040] (3) According to the degree of separation of the curves, the invasion depth of the formation model, the resistivity of the invasion zone, and the initial value of the formation resistivity are selected;

[0041] (4) Using the finite element method, based on GPU parallel computing technology, the calculation tasks are divided into 25 processes, the calculation tasks are allocated, and the LWD resistivity response at the corresponding depth point of the measured curve is calculated. The calculated LWD resistivity The response is ...

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Abstract

The invention discloses an electromagnetic propagation resistivity logging joint inversion method based on parallel computing technology. The method comprises following steps of A: loading electromagnetic propagation resistivity logging data; B: performing smooth filtering and automatic layering for logging curves; C: selecting stratum model invasion depth and invasion electrical resistivity according to curve separation degree; D: calculating electromagnetic propagation resistivity logging response of corresponding depth points of measured curved by use of the limited element method based on multinuclear parallel or GPU parallel computing technology; and E: calculating a relative error of the forward simulation response value and measured data, outputting the model value to be the inversion result if the relative error is smaller than a set threshold value, and if not, calculating variable quantity of the model, resetting stratum model parameter, and returning to the step D until outputting the reversion result according to the Marquette iterative algorithm. According to the invention, the method is quick inversion calculating speed, high in precision, suitable for server invasion of mud, and capable of providing technical support for storage layer evaluation and pollution level evaluation of the storage layer.

Description

technical field [0001] The invention relates to a resistivity logging inversion method, in particular to a combined inversion method for resistivity logging while drilling based on parallel computing technology. Background technique [0002] Resistivity logging while drilling (LWD) is an electromagnetic wave propagation logging technology. It takes the three-coil system structure of single transmission and double reception as the basic structural unit, and records the amplitude attenuation and phase shift of the two receiving coils. Amplitude attenuation resistivity and phase shift resistivity for drilling logs. For example, the Schlumberger ARC675 resistivity logging tool has five different source distances from 16in to 40in, and two operating frequencies of 2MHz and 400KHz, and measures 20 apparent resistivity curves such as amplitude attenuation resistivity and phase shift resistivity P16H. . The apparent resistivity curves of resistivity logging while drilling have...

Claims

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Application Information

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IPC IPC(8): E21B49/00
Inventor 蔡军高永德张恒荣曾少军
Owner CHINA NAT OFFSHORE OIL CORP
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