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Sonic logging tool including receiver and spacer structure

A technology of logging tools and receivers, applied to the reradiation of sound waves, radio wave measurement systems, seismology for logging records, etc.

Inactive Publication Date: 2003-12-03
SCHLUMBERGER OVERSEAS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Currently, no method is entirely successful in eliminating or preventing flexible "tool reach"

Method used

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  • Sonic logging tool including receiver and spacer structure
  • Sonic logging tool including receiver and spacer structure
  • Sonic logging tool including receiver and spacer structure

Examples

Experimental program
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Embodiment Construction

[0033] see now figure 2 It can be seen that a drilling and logging tool according to an embodiment of the present invention includes a receiver portion and a spacer portion. figure 2 The illustrated tool includes an acoustic transmitter assembly 110 which in turn includes a centering device 112 and a standoff 114 . image 3Transmitter assembly 110 is shown in more detail and includes electronics section 120 with corresponding electronics and driver circuitry for the acoustic source, oil volume compensator section 122, first dipole source 124 (nominal "Y " direction), a second dipole source 126 (perpendicular to the first dipole source 124, nominally "X" direction) and a monopole source 128. Dipole sources 124, 126 are substantially identical to applicants' copending U.S. patent application Serial No. 09 / 537,836, filed March 2, 2000, entitled "Dipole Logging Tool," incorporated herein for reference); and the unipolar source 128 is substantially as described in US5036945 (he...

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PUM

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Abstract

A formation logging tool having a substantially continuous central mandrel with regularly spaced mass blocks disposed thereon, at least some of the mass blocks carrying sensors such as receivers. By adopting this structure, the tool can be made to behave as a mass-spring structure and its flexural and extensional behaviour controlled such that its dispersion curve does not extend into the dispersion curve of the formation to be logged. The structure can be applied to the whole of the logging tool or just to the receiver section and / or any spacer section between the receiver and the transmitter section.

Description

technical field [0001] This invention relates to the construction of receiver packs and spacers for use in sonic logging tools. More particularly, the present invention relates to a structure having exceptionally flexible properties that reduce the effects of interference with sonic logging measurements. Background technique [0002] The field of acoustic drilling and logging in the oil and gas industry includes acoustic measurements of wells generally in the frequency range of 500 Hz to 20 KHz. Generally, below this range is considered to be in the field of seismic survey, and above this range is considered to be in the field of ultrasonic waves. A general technical introduction to acoustic logging for well drilling can be found in "Geophysical Prospecting Using Acoustics and Ultrasonics" Wiley Encyclopedia of Electrical and Electronic Engineering, (1999) pp. 340-365. [0003] An example of a sonic logging tool used by Schlumberger is figure 1 The Dipole Sonic Imaging To...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/52
CPCG01V1/52Y10S367/911G01V1/523
Inventor 戴维·霍伊尔田代齐大塚朗贾西尔·帕布恩杉山均
Owner SCHLUMBERGER OVERSEAS SA