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Antenna coupler coupled with logging-while-drilling resistivity apparatus

A technology of resistivity logging and antenna coupler, which is applied in the field of antenna coupler and can solve problems such as difficult antenna performance detection

Active Publication Date: 2015-04-15
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiency that it is currently difficult to detect the working performance of the transmitting and receiving antennas of the resistivity logging tool while drilling

Method used

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  • Antenna coupler coupled with logging-while-drilling resistivity apparatus
  • Antenna coupler coupled with logging-while-drilling resistivity apparatus
  • Antenna coupler coupled with logging-while-drilling resistivity apparatus

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Embodiment Construction

[0021] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. The embodiments of the present application and the combinations of the various features in the embodiments without conflict are within the protection scope of the present invention.

[0022] Such as figure 1 The antenna coupler coupled with the LWD resistivity logging tool in the illustrated embodiment of the present application mainly includes a coupling coil 3 , a coil support, and a cable joint 4 .

[0023] In the embodiment of the present application, the coupling coil 3 coupled to the transmitting antenna and the receiving antenna of the resistivity logging tool while drilling mainly includes a magnetic core coil 6 and a magnetic core 7 with an opening (shown by a ...

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Abstract

The invention discloses an antenna coupler coupled with a logging-while-drilling resistivity apparatus, which overcomes the defect that an operation of carrying out working performance test on transmitting and receiving antennas of the logging-while-drilling resistivity apparatus is difficult to perform currently. The antenna coupler comprises a coupling coil, a coil bracket and a cable joint, wherein the coupling coil coupling transmitting and receiving antennas of the logging-while-drilling resistivity apparatus is fixed on a drill collar of the logging-while-drilling resistivity apparatus through the coil bracket; and the cable joint for connecting a transmission cable is connected with the coupling coil. According to the implementation of the invention, the conversion of signals between a simulation testing device and the apparatus is realized by using the electromagnetic coupling between coils and antennas according to the principle of electromagnetic wave propagation.

Description

technical field [0001] The invention relates to an antenna coupler, in particular to an antenna coupler coupled with a resistivity logging tool while drilling. Background technique [0002] The resistivity logging tool while drilling can measure the original resistivity value of the formation immediately after the formation is drilled, so as to guide the drilling engineer to deal with the drilling program in time. This performance is very important for multi-directional drilling. [0003] Since the LWD resistivity logging tool is generally installed in a metal drill collar weighing several tons, the current method of testing and calibrating the tool is generally to use "air zero" and "water pool calibration" (in a large area of ​​known resistivity Measuring instrument in the pool) to carry out. These two detection methods are complex and inaccurate, and because there is only one scale, it is almost impossible to complete two or more scales. [0004] The high-frequency (1, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
Inventor 张江涛张国辉赵曦张尧
Owner CHINA NAT OFFSHORE OIL CORP