Sector cement bond logging instrument

Abstract

The invention discloses a sector cement cementation logging instrument, which comprises an acoustic wave emitting source on the acoustic system, a 3ft acoustic wave receiving source and a 5ft acoustic wave receiving source on the acoustic system, and the acoustic wave emitting source adopts a monopole transmitter and is arranged at a position of 1ft A single-pole receiving transducer for detecting the fast bottom layer. When logging, the single-pole receiving transducer transmits the amplitude of the first wave at the position and the arrival time to the surface numerical control system, which is used to monitor whether the fast formation is encountered; at 2ft At the source distance position, arrange a 10-sector receiving transducer. This application firstly solves the problem of fast formation encountered during well logging. When the propagation velocity of the sound wave in the formation is greater than the propagation velocity in the casing, the conventional 2ft sector reception and 3ft sound amplitude reception, the obtained waveform may be It is a formation wave, and this application can identify it to avoid the occurrence of errors in logging interpretation. The downhole instrument is more detailed and can more accurately reflect the cementation of the first interface.

Description

technology Technical field: [0001] The invention relates to a well logging instrument in the field of petroleum exploitation, in particular to a sector cemented well logging instrument with an optimized structure. Background technique: [0002] When performing cased hole acoustic logging, the common variable density acoustic logging tool is commonly used, which generally includes two detection functions, that is, acoustic amplitude logging with a source distance of 3 ft (displaying the cementation of the first interface) and a source distance of 5 ft. The full wave train log of (showing the cementation of the first interface). Since the 3ft source distance is non-directional reception, when affected by factors such as micro-annulus and mud performance changes, it is impossible to identify trenches of a certain size and their orientation. At present, some sectoral cement bonded logging tools have appeared in the domestic and foreign markets, but these tools usually have a ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of this application is to solve the problem that ordinary variable density logging tools and conventional sector logging tools cannot accurately display the cementation of the first interface, and when encountering fast formation , the problem of mismeasurement occurs, and a sector cement bonded logging tool is provided

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