CA2522259A1 - Apparatus and method for formation evaluation - Google Patents

Apparatus and method for formation evaluation Download PDF

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Publication number
CA2522259A1
CA2522259A1 CA002522259A CA2522259A CA2522259A1 CA 2522259 A1 CA2522259 A1 CA 2522259A1 CA 002522259 A CA002522259 A CA 002522259A CA 2522259 A CA2522259 A CA 2522259A CA 2522259 A1 CA2522259 A1 CA 2522259A1
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CA
Canada
Prior art keywords
packer
probe assembly
sampling tube
wellbore
probe
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA002522259A
Other languages
French (fr)
Other versions
CA2522259C (en
Inventor
Raymond V. Nold Iii
Alexander F. Zazovsky
Steven Ervin
Christopher S. Del Campo
Stephane Briquet
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Schlumberger Canada Ltd
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Schlumberger Canada Ltd
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 Schlumberger Canada Ltd filed Critical Schlumberger Canada Ltd
Publication of CA2522259A1 publication Critical patent/CA2522259A1/en
Application granted granted Critical
Publication of CA2522259C publication Critical patent/CA2522259C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/10—Obtaining fluid samples or testing fluids, in boreholes or wells using side-wall fluid samplers or testers

Abstract

A probe assembly samples fluid from a wellbore penetrating a subsurface formation having a virgin fluid therein beyond a layer of contaminated fluid surrounding the wellbore.
The probe assembly includes a probe body extendable from a downhole tool, and a packer carried by the probe body and having a distal surface adapted for sealingly engaging the wellbore. The packer has an outer and inner periphery, with the inner periphery being defined by a bore through the packer. The packer is further equipped with channel(s) formed in the distal surface and arranged to define an annular cleanup intake intermediate the inner and outer peripheries. The passageway(s) extend(s) through the packer for conducting virgin fluid and/or contaminated fluid between the channel(s). A sampling tube is sealingly disposed in the bore of the packer for conducting virgin fluid to a second inlet in the probe body and the downhole tool.

Claims (26)

1. A probe assembly for employment by a downhole tool disposed in a wellbore surrounded by a layer of contaminated fluid, the wellbore penetrating a subsurface formation having a virgin fluid therein beyond the layer of contaminated fluid, the probe assembly comprising:
a probe body extendable from the downhole tool;
a packer carried by the probe body and having a distal surface adapted for sealingly engaging a portion of the wellbore, the packer having an outer diameter and an inner diameter, the inner diameter being defined by a bore through the packer, the packer being further equipped with:
one or more channels formed in the distal surface and arranged to define an annular cleanup intake intermediate the inner and outer diameters;
a plurality of braces disposed in the one or more channels and operatively connected to define a flexible bracing ring; and at least one passageway extending through the packer for conducting one of virgin fluid, contaminated fluid and combinations thereof between the one or more channels and a first inlet in the probe body, the first inlet in the probe body fluidly communicating with the downhole tool;
a sampling tube sealingly disposed in the bore of the packer for conducting virgin fluid to a second inlet in the probe body, the second inlet in the probe body fluidly communicating with the downhole tool.
2. The probe assembly of claim 1, wherein the probe body is extendable under hydraulic pressure delivered from the downhole tool.
3. The probe assembly of claim 1, wherein the sampling tube is extendable from the probe body under hydraulic pressure delivered from the downhole tool.
4. The probe assembly of claim 1, wherein the sampling tube is equipped with a filter for filtering particles from the virgin fluid admitted to the sampling tube.
5. The probe assembly of claim 1, further comprising a piston disposed within the sampling tube and being extendable from the probe body for ejecting particles from the sampling tube upon extension of the piston relative to the sampling tube.
6. The probe assembly of claim 5, wherein the piston comprises an axial passageway therein and one or more perforations in a sidewall thereof for conducting virgin fluid admitted to the sampling tube to the axial passageway, the axial passageway fluidly communicating with the second inlet in the probe body.
7. The probe assembly of claim 1, wherein the braces are integrally formed with the packer.
8. The probe assembly of claim 1, wherein the braces are flexible and are press-fitted into the one or more channels.
9. The probe assembly of claim 1, wherein the packer is equipped with one continuous annular channel formed in the distal surface intermediate the inner and outer diameters thereof.
10. The probe assembly of claim 1, wherein the packer is equipped with a plurality of channels formed in the distal surface and arranged in an annular cleanup intake intermediate the inner and outer diameters thereof.
11. The probe assembly of claim 10, wherein the packer is equipped with a plurality of passageways each extending therethrough for conducting one of virgin fluid, contaminated fluid and combinations thereof between one of the channels and the first inlet in the probe body.
12. The probe assembly of claim 1, wherein each passageway in the packer is lined with a tube.
13. The probe assembly of claim 12, wherein each passageway tube is integrally formed with the packer.
14. A probe assembly for employment by a downhole tool disposed in a wellbore surrounded by a layer of contaminated fluid, the wellbore penetrating a subsurface formation having a virgin fluid therein beyond the layer of contaminated fluid, the probe assembly comprising:
a probe body extendable from the downhole tool;
an outer packer carried by the probe body for sealingly engaging a first annular portion of the wellbore, the outer packer having a bore therethrough;
a sampling tube disposed in the bore of the outer packer and forming an annulus therebetween, the sampling tube being extendable from the probe body and carrying an inner packer on a distal end thereof for sealingly engaging a second annular portion of the wellbore within the first annular portion;
a first inlet in the probe body fluidly communicating with the annulus for admitting one of virgin fluid, contaminated fluid and combinations thereof into the downhole tool; and a second inlet in the probe body fluidly communicating with the sampling tube for admitting virgin fluid into the downhole tool.
15. The probe assembly of claim 14, wherein the probe body is extendable under hydraulic pressure delivered from the downhole tool.
16. The probe assembly of claim 14, wherein the sampling tube is equipped with a filter for filtering particles from the virgin fluid admitted to the sampling tube.
17. The probe assembly of claim 14, wherein the distal end of the sampling tube comprises an annular channel.
18. The probe assembly of claim 17, wherein the inner packer is toroidally-shaped and is carried in the annular channel of the distal end of the sampling tube.
19. The probe assembly of claim 14, further comprising a tubular brace disposed in the annulus for supporting the outer packer.
20. The probe assembly of claim 19, wherein the tubular brace is equipped with a filter for filtering particles from the virgin fluid, contaminated fluid, or combinations thereof admitted to the annulus.
21. The probe assembly of claim 20, wherein the sampling tube is equipped with an outer flange for ejecting particles from the annulus upon extension of the sampling tube relative to the tubular brace.
22. The probe assembly of claim 14, further comprising a piston disposed within the sampling tube and being extendable from the probe body for ejecting particles from the sampling tube upon extension of the piston relative to the sampling tube.
23. The probe assembly of claim 22, wherein the piston comprises an axial passageway therein and one or more perforations in a sidewall thereof for conducting virgin fluid admitted to the sampling tube to the axial passageway, the axial passageway fluidly communicating with the second inlet in the probe body.
24. A method for acquiring a sample of a virgin fluid from a subsurface formation penetrated by a wellbore surrounded by a layer of contaminated fluid, comprising the steps of:
effecting a seal against a first annular portion of the wellbore;
effecting a seal against a second annular portion of the wellbore within the first annular portion, thereby isolating an annular portion of the wellbore between the first and second annular portions as well as a circular portion of the wellbore within the first annular portion;

drawing one of virgin fluid, contaminated fluid and combinations thereof through the isolated annular portion of the wellbore; and drawing virgin fluid through the isolated circular portion of the wellbore.
25. The method of claim 24, further comprising the step of collecting the virgin fluid drawn through the isolated circular portion of the wellbore.
26. The method of claim 24, wherein:
the seal is effected against the first annular portion using an extendable outer packer; and the seal is effected against the second annular portion using an extendable inner packer, the inner packer being extendable beyond the outer packer;
the outer and inner packers being components of a probe assembly conveyed on a downhole tool disposed in the wellbore.
CA2522259A 2004-10-07 2005-10-04 Apparatus and method for formation evaluation Expired - Fee Related CA2522259C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/960,403 US7458419B2 (en) 2004-10-07 2004-10-07 Apparatus and method for formation evaluation
US10/960,403 2004-10-07

Publications (2)

Publication Number Publication Date
CA2522259A1 true CA2522259A1 (en) 2006-04-07
CA2522259C CA2522259C (en) 2010-05-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2522259A Expired - Fee Related CA2522259C (en) 2004-10-07 2005-10-04 Apparatus and method for formation evaluation

Country Status (13)

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US (4) US7458419B2 (en)
CN (2) CN1757881B (en)
AU (1) AU2005218568B2 (en)
BR (1) BRPI0504579B1 (en)
CA (1) CA2522259C (en)
DE (1) DE102005048332A1 (en)
FR (1) FR2876409B1 (en)
GB (2) GB2418938B (en)
MX (1) MXPA05010723A (en)
MY (1) MY140303A (en)
NO (1) NO20054600L (en)
RU (1) RU2379506C2 (en)
SA (1) SA05260313B1 (en)

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AU2005218568B8 (en) 2006-04-27
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US20100218943A1 (en) 2010-09-02
RU2005131002A (en) 2007-04-20
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US7584786B2 (en) 2009-09-08
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US20070209793A1 (en) 2007-09-13
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US20060076132A1 (en) 2006-04-13
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CN1757881B (en) 2010-11-17
AU2005218568A1 (en) 2006-04-27
US7458419B2 (en) 2008-12-02
US7793713B2 (en) 2010-09-14
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BRPI0504579A (en) 2006-05-23
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AU2005218568B2 (en) 2007-12-13
CN101892839A (en) 2010-11-24

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