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Array coil system of azimuthal electromagnetic wave resistivity logging instrument while drilling

A technology of resistivity logging and array coils, applied in the field of array coil systems

Active Publication Date: 2013-01-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, large international companies such as Schlumberger, Baker Hughes, and Halliburton all have azimuth resistivity logging tools while drilling, which have been widely used in actual production and have achieved good application results. blank

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  • Array coil system of azimuthal electromagnetic wave resistivity logging instrument while drilling
  • Array coil system of azimuthal electromagnetic wave resistivity logging instrument while drilling

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Embodiment Construction

[0015] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other arbitrarily if there is no conflict.

[0016] See figure 1 , Which shows the layout diagram of the array coil system according to the present invention. Such as figure 1 As shown, the main structure includes a coil carrier 1 and an array coil system 2, wherein the array coil system 2 is wound in a corresponding hole or slot on the coil carrier 1. If the carrier is a non-magnetic drill collar, a groove is carved directly under the coil and along the direction perpendicular to the coil. The groove is an insulating medium. The space formed is conducive to the passage of magnetic force lines and facilitates signal detection.

[0017]...

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Abstract

The invention relates to an array coil system of an azimuthal electromagnetic wave resistivity logging instrument while drilling, wherein the array coil system (2) is wound in a corresponding hole or groove in a coil carrier (1) and comprises a plurality of groups of transmitting coils and a plurality of groups of receiving coils; the transmitting coils are symmetrically distributed longitudinal coils of different spacing; and the receiving coils are symmetrically distributed on the two sides of the center of the array coil system (2) and comprise longitudinal coils with coil system magnetic dipole direction coaxial with the instrument and transverse coils with coil system magnetic dipole direction vertical with the instrument. According to the array coil system, the characteristics of stratum azimuth, dip, resistivity and anisotropy can be achieved, and information such as stratum structure change and distance from a wellbore to the boundary of a reservoir stratum can also be achieved; and the array coil system has an important effect on accurate geological guidance and reservoir stratum evaluation in a well drilling process. The array coil system is suitable for the technical field of logging in oil and gas exploration.

Description

Technical field [0001] The invention relates to an array coil system of a while-drilling azimuth electromagnetic wave resistivity logging tool, which belongs to the technical field of logging in oil and gas exploration. Background technique [0002] The conventional electromagnetic wave resistivity logging tool uses a longitudinal coil system arranged along the axis of the tool (that is, the magnetic dipole direction of the coil is coaxial with the tool) to measure the formation resistivity. The measurement result is basically the overall effect of the formation resistivity around the well, but it is not sensitive to changes in the azimuth of the formation resistivity. Although it is also affected by the anisotropy of resistivity, it is impossible to solve the anisotropy value of resistivity without constraints. More importantly, the conventional electromagnetic wave resistivity is difficult to determine the distance from the boundary of the upper and lower surrounding rock to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/13E21B49/00E21B47/02G01V3/12
Inventor 马明学李国玉秦才会岳喜洲王仡仡季新标丰扬罗曦李爱勇
Owner CHINA NAT OFFSHORE OIL CORP
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