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Novel while-drilling azimuth gamma forward modeling method based on integral calculation

An azimuth gamma, forward modeling technology, applied in the field of azimuth gamma forward modeling while drilling based on integral calculation, can solve the problem of increasing the difficulty of integral calculation, and achieve the effect of high accuracy, simple calculation and high efficiency

Pending Publication Date: 2019-04-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a shielding layer on the back of the azimuth gamma detector. The existence of the shielding layer makes the gamma detector only receive gamma rays from one side, and the analog detection range becomes a combination of a cone and a bow. In addition, the formation and detection range The intersection direction of the intersection is irregular, which increases the difficulty of integral calculation

Method used

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  • Novel while-drilling azimuth gamma forward modeling method based on integral calculation
  • Novel while-drilling azimuth gamma forward modeling method based on integral calculation
  • Novel while-drilling azimuth gamma forward modeling method based on integral calculation

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Embodiment 1

[0040] The embodiment of the application of the present invention provides an azimuth-while-drilling gamma forward calculation algorithm based on integral calculation. The specific implementation scheme includes the following steps. The steps are as follows: figure 1 Shown:

[0041] (1) Step S1: Establish a detection model. The azimuth gamma forward simulation detection model is established, and the instrument parameters required for the forward modeling process are set according to the instrument parameters of the azimuth gamma detector used in the forward modeling. Establish spatial coordinates and design a simplified model of forward modeling such as figure 2 , the well trajectory is represented by a straight line in space, and the dip angle of the stratum interface is set according to the relative angle between the designed well trajectory and the stratum, and the stratum interface is represented by a space plane. The general equation of the space plane is Ax+By+Cz+D=0, ...

Embodiment 2

[0089] The application of the present invention also provides an azimuth-while-drilling gamma forward modeling device based on integral calculation, the gamma forward modeling device includes:

[0090] Detection model establishment module: used to establish the azimuth gamma forward modeling simulation detection model, set the instrument parameters required for the forward modeling process according to the instrument parameters of the azimuth gamma detector used in the forward modeling, and set the formation radioactive parameters according to the seismic data and geological information and other relevant information;

[0091] Sampling point calculation module: used to start from the starting point of the well trajectory and calculate the sampling point according to the well trajectory and distance measurement;

[0092] Calculation model selection module: used for judging the relative position between the integral calculation area and the stratum interface according to the pos...

Embodiment 3

[0096] The application of the present invention also provides an azimuth gamma detector while drilling, which is characterized in that the azimuth gamma detector while drilling includes: the gamma forward modeling device in embodiment 2, which is used to execute any one of embodiment 1 The gamma forward modeling method described above.

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Abstract

The invention discloses a novel while-drilling azimuth gamma forward modeling method based on integral calculation. According to the method, while-drilling azimuth gamma forward modeling can be rapidly and accurately carried out; According to the forward modeling method, the radioactive parameter difference and the stratum attenuation coefficient difference of different stratums are considered, the influence of a shielding layer in the orientation-while-drilling gamma logging instrument on the gamma ray range received by the gamma detector is studied, and only gamma rays in the detection rangeare counted. And according to the stratum structure condition set by the user, carrying out forward modeling to obtain a prior model of the azimuth gamma data while drilling, and guiding geosteeringdrilling. The azimuth gamma image response characteristics of the drill bit when meeting different stratums can be simulated according to the azimuth gamma forward modeling algorithm, and a user can accurately and timely obtain the underground condition according to the image characteristics.

Description

technical field [0001] The invention relates to the technical field of data processing while drilling, in particular to a method, device and equipment for azimuth gamma forward modeling while drilling based on integral calculation. Background technique [0002] Geosteering is currently the main method for developing complex and thin reservoirs. Geosteering uploads the engineering and geological parameters during the drilling process in real time, and analyzes the drilling trajectory and geological information encountered in real time. Natural gamma ray logging is one of the important reference data for geosteering. It can divide geological horizons, determine the shale content of sandstone and qualitatively judge the permeability of rock formations according to the azimuth logging data. Using azimuth gamma forward modeling to study the response characteristics of azimuth gamma images under different geological structures and establish an empirical model can provide a theore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 孙岐峰闫亚男段友祥任辉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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