WO2002031538B1 - Method for borehole measurement of formation properties - Google Patents

Method for borehole measurement of formation properties

Info

Publication number
WO2002031538B1
WO2002031538B1 PCT/US2001/031668 US0131668W WO0231538B1 WO 2002031538 B1 WO2002031538 B1 WO 2002031538B1 US 0131668 W US0131668 W US 0131668W WO 0231538 B1 WO0231538 B1 WO 0231538B1
Authority
WO
WIPO (PCT)
Prior art keywords
bottom hole
hole assembly
signal
formation
receiver signal
Prior art date
Application number
PCT/US2001/031668
Other languages
French (fr)
Other versions
WO2002031538A1 (en
Inventor
Hans Thomann
Charles Frederick Pepper
Stuart Ronald Keller
Original Assignee
Exxonmobil Upstream Res Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exxonmobil Upstream Res Co filed Critical Exxonmobil Upstream Res Co
Priority to AU2001296776A priority Critical patent/AU2001296776A1/en
Priority to EP01977676A priority patent/EP1410072A4/en
Publication of WO2002031538A1 publication Critical patent/WO2002031538A1/en
Publication of WO2002031538B1 publication Critical patent/WO2002031538B1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
    • G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
    • G01V1/48—Processing data
    • G01V1/50—Analysing data

Abstract

The present invention is a method for estimating formation properties (4), by analyzing acoustic waves (20) that are emitted from and received by a bottom hole assembly (14).

Claims

AMENDED CLAIMS[received by the International Bureau on 20 February 2002 (20.02.02); original claims 1 , 2, 5, 6, 8, and 12-22 replaced by amended claims 1 , 2, 5, 6, 8 and 12-18; remaining claims unchanged (5 pages)]
1. A method of continuously specifying the mudweight to be used in a drilling operation, comprising the steps of:
(a) generating a source signal from a bottom hole assembly;
(b) detecting at least one receiver signal using said bottom hole assembly;
(c) computing a frequency dependent characteristic of said at least one receiver signal;
(d) using said frequency dependent characteristic to estimate a property of a formation in the region of said bottom hole assembly; and
(e) using said frequency dependent characteristic to specify said mudweight.
2. The method of claim 2 wherein said bottom hole assembly comprises a drilling apparatus.
3. The method of claim 2 wherein said source signal is a noise spectrum generated by a drill bit of said drilling apparatus.
4. The method of claim 3 wherein said step of determining frequency dependence is carried out by cross-correlation analysis. - 27 -
5. The method of claim 4 wherein said receiver signal comprises a direct formation signal, and wherein said formation surrounds said borehole.
6. The method of claim 4 wherein said receiver signal comprises a reflected signal, and wherein said formation is ahead of said borehole.
7. The method of claim 1 wherein said frequency dependent characteristic is amplitude attenuation.
8. The method of claim 7 wherein said formation property is pore pressure.
9. The method of claim 8 wherein said pore pressure is estimated from a frequency dependent attenuation relationship.
10. The method of claim 1 wherein said frequency dependent characteristic is wave propagation velocity.
11. The method of claim 10 wherein said formation property is pore pressure.
12. The method of claim 1 wherein said source signal is generated by an active source located on said bottom hole assembly.
13. The method of claim 12 wherein said step of determining frequency dependence is carried out by a frequency component analysis.
14. The method of claim 1 wherein said receiver signal comprises a direct borehole signal. - 28 -
15. The method of claim 14 wherein said formation property is permeability.
16. A method of continuously estimating the pore pressures of formations ahead of a bottom hole assembly, comprising the steps of
a) generating a source signal from said bottom hole assembly;
b) detecting at least one receiver signal using said bottom hole assembly;
c) using said source signal and said at least one receiver signal to estimate a pore pressure of at least one said formation; and
d) repeating steps a), b), and c) as said bottom hole assembly moves sequentially downward through said formations.
17. A method of continuously monitoring the wellbore pressure safety margin corresponding to formations ahead of a bottom hole assembly, comprising the steps of
a) generating a source signal from said bottom hole assembly;
b) detecting at least one receiver signal using said bottom hole assembly;
c) using said source signal and said receiver signal to determine a pore pressure of said formation; - -
d) using said pore pressure to monitor said wellbore pressure safety margin; and
e) repeating steps a), b), c) and d) as said bottom hole assembly moves sequentially downward through said formations.
18. A method of continuously optimizing the weight of drilling mud used in a drilling operation, comprising the steps of
a) generating a source signal from a bottom hole assembly;
b) detecting at least one receiver signal using said bottom hole assembly;
c) using said source signal and said at least one receiver signal to determine a pore pressure of a formation ahead of said bottom hole assembly; and
d) using said pore pressure to specify a weight of said drilling mud which corresponds to a target wellbore pressure safety margin.
- -
This page intentionally left blank.
PCT/US2001/031668 2000-10-10 2001-10-09 Method for borehole measurement of formation properties WO2002031538A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001296776A AU2001296776A1 (en) 2000-10-10 2001-10-09 Method for borehole measurement of formation properties
EP01977676A EP1410072A4 (en) 2000-10-10 2001-10-09 Method for borehole measurement of formation properties

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US68673500A 2000-10-10 2000-10-10
US09/686,735 2000-10-10
US09/973,529 2001-10-09
US09/973,529 US20020159332A1 (en) 2000-10-10 2001-10-09 Method for borehole measurement of formation properties

Publications (2)

Publication Number Publication Date
WO2002031538A1 WO2002031538A1 (en) 2002-04-18
WO2002031538B1 true WO2002031538B1 (en) 2002-06-13

Family

ID=27103858

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/031668 WO2002031538A1 (en) 2000-10-10 2001-10-09 Method for borehole measurement of formation properties

Country Status (4)

Country Link
US (5) US20020159332A1 (en)
EP (1) EP1410072A4 (en)
AU (1) AU2001296776A1 (en)
WO (1) WO2002031538A1 (en)

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US20040059512A1 (en) 2004-03-25
EP1410072A4 (en) 2005-08-31
US20040059511A1 (en) 2004-03-25
WO2002031538A1 (en) 2002-04-18
US20040162676A1 (en) 2004-08-19
US7310580B2 (en) 2007-12-18
AU2001296776A1 (en) 2002-04-22
US20030151975A1 (en) 2003-08-14
EP1410072A1 (en) 2004-04-21
US7289909B2 (en) 2007-10-30
US20020159332A1 (en) 2002-10-31

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