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Rapid processing method for array lateral logging data of anisotropic formation of inclined shaft

An anisotropic, lateral logging technology, applied in wellbore/well components, surveying, earth-moving drilling, etc., which can solve the problems of numerous inversion parameters, slow convergence of inversion algorithms, and difficulty in selecting initial values.

Pending Publication Date: 2020-11-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention aims to solve the problems of numerous inversion parameters, difficult selection of initial values, and slow convergence speed of the inversion algorithm for anisotropic formations in inclined wells, and provides a fast processing method for array lateral logging data in anisotropic formations in inclined wells

Method used

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  • Rapid processing method for array lateral logging data of anisotropic formation of inclined shaft
  • Rapid processing method for array lateral logging data of anisotropic formation of inclined shaft
  • Rapid processing method for array lateral logging data of anisotropic formation of inclined shaft

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Embodiment Construction

[0051] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0052] Taking the rapid processing of the lateral logging data of the anisotropic formation array of the 24-layer Oklahoma model as an example, a method for rapidly processing the lateral logging data of the anisotropic formation array of the inclined well proposed by the present invention is illustrated, as follows: figure 1 As shown, it specifically includes the following steps:

[0053] Step 1. Based on the Visual Studio software platform, establish the forward modeling model of the anisotropic formation of the deviated well, and set the forward modeling model of the anisotropic formation of the inclined well, such as figure 2 As shown, among them, the wellbore environment parameters set the well diameter to 8 inches, the mud resistivity to 0.1Ω·m, and the stratum to be infinitely thick. Horizontal resistivity R th , ...

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Abstract

The invention discloses a rapid processing method for array lateral logging data of an anisotropic formation of an inclined shaft. The method comprises the following steps: establishing a forward model based on a three-dimensional finite element forward algorithm, analyzing the sensitivity of an array lateral logging response to anisotropic formation parameters of the inclined shaft, constructingan array lateral logging response database, correcting an actual measurement curve and carrying out layering; selecting a corresponding database according to block formation information, establishingan inversion initial value selection plate in combination with sensitivity analysis, rapidly determining initial values of various parameters, establishing an inversion model, simulating an array lateral logging inversion curve after initialization, calculating a two-norm between the array lateral logging inversion curve and the corrected actual measurement curve, judging whether the precision requirement is met or not, if the precision requirement is met, determining the optimal anisotropic formation parameter of the inclined shaft, and if the precision requirement is not met, constraining the inversion model according to reservoir prior information, iteratively updating the formation parameters by adopting a regularized Levenberg-Marquardt algorithm until the precision requirement is met, and determining the optimal anisotropic formation parameter of the inclined shaft. The method lays a foundation for fine evaluation of complex reservoirs.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a method for quickly processing lateral logging data of deviated well anisotropic formation arrays. Background technique [0002] In the process of drilling deviated wells, array laterolog is widely used in oil and gas reservoirs because of its strong focusing ability, high vertical resolution, and the ability to provide multiple curves with different detection depths, which greatly enriches downhole formation information. evaluate. However, array laterolog is affected by factors such as drilling fluid invasion, formation dip angle and anisotropy, and the apparent resistivity curves at different detection depths are seriously separated, so that the apparent resistivity value cannot reflect the real resistivity of the formation, so the accurate extraction of formation True resistivity has become one of the key issues to be solved in fine reservoir evaluation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00
CPCE21B47/00E21B49/00
Inventor 吴易智范宜仁李潮流王磊巫振观邢涛袁超
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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