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Electromagnetic wave propagation measuring instrument-based mud cake correction method

A correction method, electromagnetic wave technology, applied in buildings and other directions, can solve problems such as unsatisfactory correction, and achieve the effect of realizing mud cake response and eliminating the influence of electromagnetic wave dielectric phase and amplitude

Active Publication Date: 2020-04-28
中国电波传播研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The function of mud cake correction can be realized by using digital plate technology, but due to the different properties of mud cake, the plate can only solve the problem of mud cake in some cases, and cannot satisfy the correction under all mud cakes

Method used

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  • Electromagnetic wave propagation measuring instrument-based mud cake correction method
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  • Electromagnetic wave propagation measuring instrument-based mud cake correction method

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Embodiment 1

[0025] Embodiment 1, this embodiment discloses a mud cake correction method based on an electromagnetic wave propagation measuring instrument, including the following steps:

[0026] (1) Establish a dielectric mudcake correction model:

[0027] In the measurement of electromagnetic wave propagation, 1 transmitter and 4 receivers are used, and the antenna adopts dual polarization mode, and 4 phase Pha and amplitude Amp curves can be obtained. The electromagnetic wave dielectric instrument is attached to the mud cake, and the mud cake is attached to the formation. superior;

[0028] Oil layer: The dielectric constant of the mud cake is 60, the electrical conductivity is 0.25s / m, the dielectric constant of the undisturbed formation is 12, and the electrical conductivity is 0.033s / m;

[0029] Water-flooded layer: The dielectric constant of the mud cake is 60, the electrical conductivity is 0.25s / m, the dielectric constant of the undisturbed formation is 15, and the electrical con...

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Abstract

The invention discloses an electromagnetic wave propagation measuring instrument-based mud cake correction method. The method comprises the following steps of (1) establishing a dielectric mud cake correction model, and (2) carrying out an inverse algorithm process. The electromagnetic wave propagation measuring instrument-based mud cake correction method can effectively eliminate influences of mud cake parameters on the dielectric phase and amplitude of an electromagnetic wave in different polarization directions, and can eliminate a mud cake response under the condition that mud cakes are present (mud cake thickness does not exceed 5 cm).

Description

technical field [0001] The invention belongs to the field of petroleum logging, in particular to a mud cake correction method based on an electromagnetic wave propagation measuring instrument in the field. Background technique [0002] In the electromagnetic wave propagation logging system, the measured dielectric constant needs to be obtained in real time through phase information and attenuation information to evaluate fluid saturation (water saturation, oil saturation). However, in the process of oil and gas development, in order to effectively protect the wellbore, prevent wellbore collapse and prevent blowout, it is necessary to add different proportions of mud during drilling. Since the pressure in the wellbore is greater than the pressure of the formation, a certain wall will be formed around the wellbore. Thick mud cake. In the early 1980s, foreign companies proposed the method of using mudcake correction charts for mud cake correction, that is, when the mud cake an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/092
CPCY02A90/30
Inventor 杨志强李智强张静静
Owner 中国电波传播研究所