Method for analyzing x-ray fluorescence shale content in petroleum well drilling

A technology of shale content and fluorescence analysis, applied in the direction of material analysis using wave/particle radiation, analyzing materials, measuring devices, etc., to achieve representative and convincing results

Active Publication Date: 2009-01-28
中石化石油工程技术服务有限公司 +3
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Problems solved by technology

[0007] The X-ray fluorescence analysis method of the present invention, according to the new investigation of Petroleum Exploration and Development Research Institute of China Petroleum and Chemical Corporation, uses cuttings X-ray fluorescence to carry out mud logging lithology ident

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  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling
  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling
  • Method for analyzing x-ray fluorescence shale content in petroleum well drilling

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Embodiment 1

[0041] The analysis method of X-ray fluorescence shale content in oil drilling of the present invention includes the processes of X-ray fluorescence analysis, statistical analysis of chemical element data, shale content calculation and data processing of cores and cuttings at the drilling site. This example selects The X-ray fluorescence analysis data of a well in a gas field in the Ordos Basin is used as an illustration. The specific steps are as follows:

[0042] (1) X-ray fluorescence analysis of core and cuttings

[0043] The energy dispersive X-ray fluorescence analyzer is used to continuously analyze the chemical elements of the core and cuttings samples at the oil drilling site. During the analysis, the core and cuttings samples are crushed and tableted first, and then analyzed by X-ray fluorescence.

[0044] 1. Selection of analytical instruments

[0045] The analytical instrument is an energy dispersive X-ray fluorescence analyzer, and the current instrument is the ...

Embodiment 2

[0089] Such as figure 2 as shown, figure 2It is a comprehensive analysis chart of the shale content calculated based on the X-ray fluorescence analysis of iron elements and the results of geophysical logging and gas logging for a drilling well in an oilfield in the Bohai Bay Basin. from figure 2 It can be seen that the shale content curve calculated by iron element has a certain correlation with the natural gamma ray curve of geophysical logging, indicating the feasibility of using iron element to calculate shale content in the Bohai Bay Basin; and the shale content calculated by iron element There is an obvious negative correlation between the shale content and the gas total hydrocarbon value. That is, the higher the mud content, the lower the total hydrocarbon value of the gas test; on the contrary, the lower the mud content, the higher the total hydrocarbon value of the gas test. Therefore, the gas logging results also prove the feasibility of calculating the shale co...

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Abstract

The invention discloses a method that analyzes shale content in petroleum drilling wells by utilizing X ray fluorescence. The method adopts a chromatic energy dispersion typed X ray fluorescence analyzer for implementing continuous analysis of chemical elements in rock cores and rock debris corresponding with the depth of the drilling wells in a petroleum drilling spot and obtaining X ray fluorescence analyzing data corresponding with the depth change, the linear regression method is adopted for implementing correlation analysis and statistics of the X ray fluorescence analyzing data, computing the correlation coefficient between different elements, computing an average correlation coefficient between one element and other 11 elements, and choosing an element that has the largest average correlation coefficient; the shale content is computed; and a shale content curve corresponding to the depth change of the drilling wells is plotted. The method of the invention can be used for implementing timely and accurate shale content analysis of lithologic characters of drilled stratum, implementing qualitative and quantitative lithologic characters and storage capability evaluation according to shale content analyzing data, and forming an drilled geology interpreting and evaluating method that realizes the analysis according to the X ray fluorescence in drilling spot, and can correctly and efficiently instruct the exploration, exploitation and drilling production of petroleum and natural gas.

Description

1. Technical field: [0001] The invention relates to a method for analyzing mud content in petroleum drilling geology, in particular to a method for analyzing mud content in petroleum drilling by using X-ray fluorescence. 2. Background technology: [0002] In petroleum drilling geology, the "shale content" in rocks is an important parameter to evaluate the properties of reservoirs. Timely acquisition of the parameters of shale content can evaluate the properties of reservoirs in time, gain the initiative for the protection of oil and gas layers, and provide support for well completion. Provide reliable data for the determination of the plan and the formulation of the later exploration and development plan. [0003] According to the definition of GB / T 17412.2-1998 standard, "shale" refers to the clay mineral composition and clastic composition with a particle size of <0.004mm in sedimentary rocks, and rocks with a mud content of more than 50% are called argillaceous rocks. ...

Claims

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Application Information

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IPC IPC(8): G01N23/223E21B49/08
Inventor 陈英毅何国贤周天顺王飞龙
Owner 中石化石油工程技术服务有限公司
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