Title:
A TOOL, SYSTEM AND A METHOD FOR DETERMINING BARRIER AND MATERIAL QUALITY BEHIND MULTIPLE TUBULARS IN A HYDROCARBON WELLBORE
Document Type and Number:
WIPO Patent Application WO/2019/147139
Kind Code:
A3
Abstract:
A cement evaluation tool (100) comprises a body (2); a plurality of moveable assemblies (labc) having multiple arms (4) configured to move between a retracted position where the arms (4) are within a housing (3) and an extended position where the arms (4) are protruding from the housing (3) and are in contact with the inner wall of the downhole tubular element, wherein the assembly (la) comprises an acoustic broad band source array that operates in the frequency range of 0- 100 kHz and at assemblies (1b, 1c) comprise an acoustic broad band receiver array comprising one or more radially spaced acoustic broad band receivers (6). A method of determining cement bond quality behindmultiple tubulars comprises the steps of: conveying the tool into the well, activating the acoustic sources in order to trigger wave modes on the inner wall of the downhole tubular, recording wave modes excited on the inner wall of the downhole tubular, determining the eigenfrequencies of the excited wave modes, constructing a characteristic pattern of the eigenfrequencies of the excited wave modes, comparing the constructed characteristic pattern with pre-stored models in a computer to determine the material quality.
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Inventors:
ESPE EIRIK (NO)
NYHAVN FRIDTJOF (NO)
JOHANSEN TONNI FRANKE (NO)
NYHAVN FRIDTJOF (NO)
JOHANSEN TONNI FRANKE (NO)
Application Number:
PCT/NO2019/050019
Publication Date:
September 06, 2019
Filing Date:
January 25, 2019
Export Citation:
Assignee:
WELLGUARD AS (NO)
International Classes:
E21B47/00; G01V1/50
Foreign References:
| US4800537A | 1989-01-24 |
Attorney, Agent or Firm:
ZACCO NORWAY AS (NO)
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