Method for calibrating coil system in three-dimensional array induction logging instrument

A technology of induction logging and three-dimensional array, which is applied in the direction of instrumentation and geophysical measurement, etc., can solve the problems that the coils are not coaxial, not parallel, and affect the evaluation of oil and gas resources in thin sand-mudstone thin interactive formations

Inactive Publication Date: 2014-10-29
CNPC GREATWALL DRILLING ENG
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Problems solved by technology

For example, if the transmitting and receiving coils in different directions are not orthogonal, or if the coils in the same direction are not coaxial or parallel or non-coplanar, it will have a great influence on the measurement results of the instrument, thus affecting the measurement of thin sand layers. —Evaluation of oil and gas resources in mudstone thin interactive bed formations

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  • Method for calibrating coil system in three-dimensional array induction logging instrument
  • Method for calibrating coil system in three-dimensional array induction logging instrument
  • Method for calibrating coil system in three-dimensional array induction logging instrument

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[0032]The following detailed description refers to the accompanying drawings that show, by way of illustration, specific details and embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the present invention. The various embodiments are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.

[0033] In the following detailed description, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terms such as "top", "bottom", "front", "rear", "front", "tail" and the like are used with reference to the orientation...

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Abstract

The invention relates to a method for calibrating a coil system in a three-dimensional array induction logging instrument. The coil system at least includes a transmitting coil and a receiving coil. The method comprises the following steps: placing a calibration platform including an insulating horizontal support and a metal ring arranged at the an insulating horizontal support below the three-dimensional array induction logging instrument; electrifying the transmitting coil to generate an alternating electromagnetic field with a predetermined frequency; in response to the alternating electromagnetic field, generating a signal with the predetermined frequency by the receiving coil through the calibration platform; and according to the amplitude of the signal and an inclination angle and / or an azimuth angle of at least one of the transmitting coil and the receiving coil, executing calibration of the coil system.

Description

technical field [0001] The invention relates to the field of manufacturing and calibration of three-dimensional array induction logging tools, and more particularly relates to a method for calibrating coil systems in three-dimensional array induction logging tools. Background technique [0002] About 30% of the world's oil and gas resources are stored in thin sand-shale interbedded formations. Moreover, the oil and gas resources in thin sand-shale interbedded layers account for more than 30% in my country. Sand-mudstone thin alternating layers are characterized by transverse isotropy and longitudinal anisotropy. In the formation coordinate system, the transversely isotropic (TI) formation conductivity can be expressed as a diagonal matrix: [0003] (1) [0004] in, Indicates the horizontal conductivity of the formation; Indicates the vertical conductivity. Such formations are also known as transversely isotropic (TI) formations whose...

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Application Information

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IPC IPC(8): G01V13/00
Inventor 肖加奇俞燕明王林谢昱北
Owner CNPC GREATWALL DRILLING ENG
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