Well-logging instrument and well-logging base nose thereof

Abstract

The invention discloses a well-logging instrument and a well-logging base nose thereof. The well-logging instrument integrates the functions of a spontaneous potential well-logging instrument, a mud resistivity well-logging instrument and the well-logging base nose, so that the equipment integration level is improved, the well-logging instrument is structurally simplified, and the overall length of the well-logging instrument is decreased. The well-logging base nose comprises an upper joint and a shock absorption portion. The upper joint is used for connecting an upper component of the well-logging instrument. The shock absorption portion gradually contracting from top to bottom is connected on the lower portion of the well-logging instrument and comprises an emitting electrode, an integrated electrode, a first measuring electrode and a second measuring electrode which are insulated mutually, wherein the integrated electrode integrates a spontaneous potential electrode and a receiving electrode, the receiving electrode and the emitting electrode form a measuring electric field, the first measuring electrode and the second measuring electrode are positioned in the measuring electric field so as to obtain mud resistivity according to own resistance, and the spontaneous potential electrode is connected with a ground electrode so as to detect spontaneous potential.

Description

technical field [0001] The invention relates to the technical field of well logging equipment, in particular to a well logging instrument and a well logging bottom nose. Background technique [0002] Well logging equipment is an instrument for completing well logging operations, which is divided into surface instruments and downhole instruments. Well logging is an engineering operation to find out the characteristics of the formation interface in drilling and divide the geological section. It usually includes electrical logging, radioactive logging, acoustic logging, imaging logging and engineering logging (such as borehole diameter, borehole deviation, etc.) )Wait. [0003] Well logging includes methods such as spontaneous potential logging and mud resistivity logging. [0004] Among them, spontaneous potential logging is a part of electrical logging and is mainly used to divide sand-mudstone sections. Spontaneous potential logging measures the curve of the variation of ...

AI Technical Summary

Problems solved by technology

[0011] When using the above logging tools for well logging, it is necessary to assemble the spontaneous potential logging tool, mud resistivity logging tool and logging bottom nose respectively, and connect them with the upper and lower parts. That is to say, if you want to realize For the measurement of natural potential and mud resistivity, it also plays a role of shock absorption. The assembly of three parts must be completed. Due to the cumbersome assembly process, the timeliness of logging is poor

Furthermore, the above-mentioned components are sequentially connected in the axial direction of the logging tool, resulting in a large number of connection joints in the entire logging tool formed by assembly, and the length is too long, which increases the risk of use

In addition, the maintenance and replacement of the above-mentioned logging tools are relatively complicated.

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