Real-time Extraction Method of Formation Interface Based on Azimuth Electromagnetic Logging Data While Drilling

A technology for logging data and formation interface, which is applied in construction, design optimization/simulation, special data processing applications, etc., to achieve the effect of satisfying real-time extraction and improving inversion speed

Active Publication Date: 2022-01-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0003] So far, the dual-interface inversion model has been widely used in the processing of azimuth electromagnetic wave data while drilling, but there are still many problems in the inversion speed of the dual-interface inversion stratigraphic model and the inversion accuracy in thin layers

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  • Real-time Extraction Method of Formation Interface Based on Azimuth Electromagnetic Logging Data While Drilling
  • Real-time Extraction Method of Formation Interface Based on Azimuth Electromagnetic Logging Data While Drilling
  • Real-time Extraction Method of Formation Interface Based on Azimuth Electromagnetic Logging Data While Drilling

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Embodiment Construction

[0059] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0060] combine figure 1 As shown, the real-time extraction method of formation interface based on azimuth electromagnetic wave logging data while drilling includes the following steps:

[0061] s1. Obtain the logging data of pilot wells, including resistivity and geological signal logging data.

[0062] s2. Extract formation resistivity and lithology sequences based on pilot well logging data, such as layer thickness, resistivity and formation lithology.

[0063] s3. Sliding window processing is performed on the actual logging data of highly deviated wells / horizontal wells, and the initial complex formation model is transformed into a series of one-dimensional layered formation models after windowing.

[0064] Through the above design, it is beneficial to simplify the three-dimensional inversion problem into a series of one-dimensional inversi...

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Abstract

The invention discloses a real-time extraction method of formation interface based on azimuth electromagnetic wave logging data while drilling. The extraction method includes the steps: s1. Sliding windowing on the logging data of highly deviated wells / horizontal wells; s2. If there are shallow detection geological signals, then perform step s3, otherwise perform step s5; s3. Use shallow detection geological signals signal, perform single-interface inversion; s4. input the optimal solution of single-interface inversion into step s7 as a known constraint; s5. establish a double-interface inversion model; s6. judge whether there is adjacent interface information; Execute step s7, otherwise execute step s8; s7. select multiple initial values ​​for the remote formation interface position and far surrounding rock resistivity in the model described in s5, and then go to step s9; s8. Assign multiple initial values ​​to the inversion parameters; s9. Obtain the optimal solution for dual-interface inversion based on the deep detection geological signals; s10. Perform real-time imaging processing on the inversion results. The invention can provide fast and accurate interface information for real-time geosteering.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, belongs to the category of electric well logging methods, and in particular relates to a real-time extraction method of formation interface based on azimuth electromagnetic wave logging data while drilling. Background technique [0002] During the drilling of deviated wells / horizontal wells, the real-time determination of the distance and orientation of the formation interface is one of the key issues to be solved in geosteering while drilling. transformation is of great significance. Using the azimuth electromagnetic logging tool while drilling, combined with the typical response characteristics of the tool, the position information of the formation interface can be qualitatively judged. However, due to the influence of the downhole formation environment, the response of the azimuth electromagnetic logging is extremely complex, and the inversion speed of the traditi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/13G06F30/20
CPCG06F30/20E21B47/13
Inventor 王磊范宜仁吴易智操应长邢涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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