Method of evaluating anisotropism of stratum by acoustic logging while drilling

An anisotropic, while-drilling technology, applied in surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as formation anisotropy, and achieve the effects of suppressing non-uniqueness, high precision, and good application prospects

Active Publication Date: 2019-10-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for evaluating formation anisotropy by acoustic logg...

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  • Method of evaluating anisotropism of stratum by acoustic logging while drilling
  • Method of evaluating anisotropism of stratum by acoustic logging while drilling
  • Method of evaluating anisotropism of stratum by acoustic logging while drilling

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Embodiment Construction

[0054] like figure 1 As shown, the present invention proposes a method for evaluating formation anisotropy by acoustic logging while drilling, and the working process is as follows:

[0055] Step 1. During the sonic logging while drilling operation, collect monopole and quadrupole sonic full-wave array data while drilling in the depth interval.

[0056] Step 2: Using the slowness-frequency correlation method (SFC) to process the monopole and quadrupole full-wave arrays while drilling respectively, and obtain the dispersion data of the Stoneley wave and quadrupole wave while drilling.

[0057] Step 3: Use the Modified Matrix Pencil Algorithm method to calculate the power spectrum of the Stoneley wave and quadrupole wave while drilling respectively from the measured data, and normalize according to the maximum value.

[0058] Step 4. Roughly judge formation anisotropy γ and vertical shear wave slowness S according to other data SV range, and each time given a set of hypothetic...

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Abstract

The invention discloses a method of evaluating anisotropism of a stratum by acoustic logging while drilling. The method comprises the following steps: acquiring full acoustic wave array data in a depth interval and processing the data to obtain frequency dispersion data of stoneley waves while drilling and quadrupole waves and respective power spectra; separately calculating theoretical frequencydispersion curves of stoneley waves and quadrupole waves by means of an assumed anisotropic value of the stratum and a slowness value of transverse waves; in respective processing frequency bands, calculating the error sum of squares of the theoretical frequency dispersion curves relative to the actually measured frequency dispersion data by weighting the power spectra and weighting the result; repeating the steps till all assumed values are calculated, and searching for the anisotropic value corresponding to the minimum value in a target function; and repeating the steps till the whole depthinterval is processed to obtain the anisotropic curve of the stratum in the processed depth interval. As a result of instantaneity of measurement while drilling, the processing result is truer and more accurate. The method suppresses the nonuniqueness problem in an inversion process effectively, and the inversion precision is relatively high.

Description

technical field [0001] The invention belongs to the field of applied geophysical acoustic logging, in particular to a method for quantitatively evaluating formation anisotropy by using logging data of monopole Stoneley waves and quadrupole waves while drilling. Background technique [0002] Anisotropy evaluation is an important topic in the exploration and development of unconventional shale oil and gas. As one of the key technologies in oil and gas exploration and development, acoustic logging while drilling has the advantages of time saving, real-time measurement, and risk avoidance, and can provide first-hand The stratigraphic anisotropy data. Using acoustic logging while drilling to evaluate formation anisotropy can obtain relatively real formation information, and then guide oil and gas exploration and development. But for a long time, the formation anisotropy information is mainly obtained from the wireline acoustic logging data, but there is no effective inversion me...

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Application Information

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IPC IPC(8): E21B47/14E21B47/013G06Q50/02
CPCE21B47/14E21B47/01G06Q50/02
Inventor 苏远大李杨虎唐晓明许松江灿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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