Black box analyzing method and device for acquiring transmission characteristic of logging cable
A technology of cable transmission and analysis method is applied in the field of black box analysis methods and devices for obtaining transmission characteristics of logging cables, which can solve the problems of inconvenience and impracticality of estimation methods of transmission characteristics of logging cables, and achieve accurate prediction of transmission characteristics. Effect
Inactive Publication Date: 2015-05-20
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
However, the prior art methods for estimating transmission characteristics of well logging cables are not practical and inconvenient
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[0034]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0035] like figure 1 As shown, it is a flow chart of a black box analysis method for obtaining the transmission characteristics of the well logging cable according to an embodiment of the present invention. The black box analysis method for obtaining the transmission characteristics of the well logging cable includes:
[0036] 101. Obtain the open circuit impedance and short circuit impedance of the sample logging cable;
[0037] 102. According to the open cir...
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The embodiment of the invention provides a black box analyzing method and device for acquiring the transmission characteristic of a logging cable. The black box analyzing method for acquiring the transmission characteristic of the logging cable comprises the following steps of: acquiring the open-circuit impedance and short-circuit impedance of a sample logging cable; computing and acquiring the electric characteristic transfer parameter of the sample logging cable according to the open-circuit impedance and short-circuit impedance of the sample logging cable; acquiring an equivalent length relation between a long-distance logging cable and the sample logging cable; and computing and acquiring the electric characteristic transfer parameter of the long-distance logging cable according to the electric characteristic transfer parameter of the sample logging cable and the length relation between the long-distance logging cable and the sample logging cable. The embodiment of the invention has the technical effects that a relatively practical, convenient and accurate implementation scheme for estimating the transmission characteristic of the logging cable is provided.
Description
technical field [0001] The invention relates to the technical field of well logging, in particular to a black-box analysis method and device for obtaining transmission characteristics of a well logging cable. Background technique [0002] With the development of modern drilling technology, coiled tubing drilling (CTD) technology has been widely used in re-drilling and multilateral well drilling. During the drilling process of coiled tubing, it is necessary to monitor the directional parameters such as well inclination azimuth and tool face angle and geological parameters in real time, so as to know the current state of the bottom hole assembly and the bottom layer information in time, so as to ensure that the drill bit can travel through the target layer . With the development of modern while-drilling technology, the measurement parameters are constantly increasing, which requires that the measurement data while drilling with a large amount of data must be transmitted to th...
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IPC IPC(8): E21B47/12
Inventor 双凯刘涛
Owner CHINA UNIV OF PETROLEUM (BEIJING)