CA2424514A1 - Method and apparatus for measuring mud and formation properties downhole - Google Patents
Method and apparatus for measuring mud and formation properties downhole Download PDFInfo
- Publication number
- CA2424514A1 CA2424514A1 CA002424514A CA2424514A CA2424514A1 CA 2424514 A1 CA2424514 A1 CA 2424514A1 CA 002424514 A CA002424514 A CA 002424514A CA 2424514 A CA2424514 A CA 2424514A CA 2424514 A1 CA2424514 A1 CA 2424514A1
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- CA
- Canada
- Prior art keywords
- borehole
- mud mixture
- energy
- sector
- tool
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims abstract 51
- 230000015572 biosynthetic process Effects 0.000 title claims abstract 5
- 239000000203 mixture Substances 0.000 claims abstract 49
- 230000003993 interaction Effects 0.000 claims abstract 22
- 238000005259 measurement Methods 0.000 claims abstract 17
- 238000005553 drilling Methods 0.000 claims abstract 10
- 230000005251 gamma ray Effects 0.000 claims 22
- 230000005855 radiation Effects 0.000 claims 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 5
- 229910052739 hydrogen Inorganic materials 0.000 claims 5
- 239000001257 hydrogen Substances 0.000 claims 5
- 230000005484 gravity Effects 0.000 claims 4
- 238000001730 gamma-ray spectroscopy Methods 0.000 claims 2
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
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- 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
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/12—Prospecting or detecting by the use of nuclear radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using gamma or X-ray sources
Abstract
A method is disclosed for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received. The method includes turning the tool in the borehole. Energy is applied into the borehole from an energy source disposed in the tool. Measurement signals are received at a sensor disposed in the tool from a location around the borehole. The cross-section of the borehole is separated into at least a first sector and a second sector. A first measurement signal from the first sector is substantially in response to returning energy which results from the interaction of the applied energy with the mud mixture. A second measurement signal from the second sector is substantially in respons e to returning energy which results from the interaction of the applied energy with the formation. An indication of an intrinsic characteristic of the mud mixture is derived from the first measurement signals associated with the first sector of the borehole.
Claims
WHAT IS CLAIMED IS:
[c1] A method for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received, comprising:
turning said tool in said borehole;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a sensor disposed in said tool from a location around said borehole;
separating a cross-section of the borehole substantially perpendicular to a longitudinal axis of the borehole into at least a first sector and a second sector, wherein a first measurement signal from said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation; and deriving an indication of an intrinsic characteristic of said mud mixture from said first measurement signal associated with the first sector of said borehole.
[c2] The method of claim 1, wherein an indication of a characteristic of said mud mixture is derived for at least two of said sectors.
[c3] The method of claim 1, wherein said intrinsic characteristic is selected from the group consisting of density, hydrogen index, salinity, sigma, neutron slowing down length, neutron slowing down time, compositional information from neutron induced gamma ray spectroscopy, and photoelectric effect.
[c4] The method of claim 1 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c5] The method of claim 1 wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c6] The method of claim 1 wherein at least one neutron gamma process is used to derive the indication of the intrinsic characteristic of said mud mixture.
[c7] The method of claim 1 wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c8] The method of claim 1 wherein the first sector includes a point opposite in the wellbore to a point defined by intersection of earth's gravity vector with said cross section.
[c9] The method of claim 1 wherein said energy applied into said borehole comprises ultrasonic pulses, and said returning energy comprises ultrasonic pulses which interact with said mud mixture.
[c10] The method of claim 1 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording the identity of each one of the sectors that said sensor is in while said tool is turning in said borehole, and recording the number of gamma ray counts in a plurality of energy windows of said sensor occurring in each one of the sectors.
[c11] The method of claim 10 wherein said sensor comprises short and long spaced gamma ray detectors spaced from an energy source which emits gamma rays, and further comprising, recording the number of gamma ray counts of said short spaced gamma ray detector per sector, and recording the number of gamma ray counts of said long spaced gamma ray detector per sector.
[c12] The method of claim 11 wherein said intrinsic characteristic is selected from the group consisting of density and photoelectric effect.
[c13] A method for determining density of a mud mixture within a borehole in which a drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying gamma rays into said mud mixture from a radiation source;
recording, with respect an angular position of said tool with respect to the borehole a count rate of gamma rays which return to the tool which result from interaction with said mud mixture;
determining at least a density of the mud mixture from the count rate of gamma rays for the at least one more of the sectors.
[c14] The method of claim 13 further comprising, defining other angular sectors of said tool about said borehole, and determining the density of the mud mixture for a plurality of said angular-sectors from the gamma ray count rates which occur solely within each of said angular sectors about said borehole.
[c15] The method of claim 13 further comprising, determining the density of the mud mixture for each of said at least more of the sectors from the gamma ray count rates which occur solely within said angular sectors about said borehole.
[c16] The method of claim 13 wherein the gamma ray counts are recorded with respect to the energy levels thereof, the energy levels segregated into at least one hard window range wherein gamma rays detected are related to density; and at least one soft window range wherein gamma rays detected are related to photoelectric effect.
[c17] A method for determining a photoelectric effect (PEF) of a mud mixture within a borehole in which a tool is received, said tool including a source of radiation and a gamma ray detector, the method comprising:
turning said tool in said borehole;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a sensor disposed in said tool from locations azimuthally distributed around said borehole;
separating a cross-section of the borehole substantially perpendicular to a longitudinal axis of the borehole into at least a first sector and a second sector, wherein a first measurement signal from said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation;
determining a density (.rho.), of the mud mixture, calculated from said first measurement signal;
determining a macroscopic cross section (U), of the mud mixture from said first measurement signal, and determining the PEF of said mud mixture as a ratio of said macroscopic cross section to said density, that is, PEF = U / .rho..
[c18] The method of claim 17, wherein an indication of the PEF of said mud mixture is derived for at least two of said sectors.
[c19] The method of claim 17, wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c20] The method of claim 17, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c21] The method of claim 17, wherein at least one neutron gamma process is used to derive the indication of the PEF of said mud mixture.
[c22] The method of claim 17, wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c23] The method of claim 17, wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording the identity of each one of the sectors that said sensor is in while said tool is turning in said borehole, and recording the number of gamma ray counts in a plurality of energy windows of said sensor occurring in each one of the sectors.
[c24] The method of claim 23 wherein said sensor comprises short and long spaced gamma ray detectors spaced from an energy source which emits gamma rays, and further comprising, recording the number of gamma ray counts of said short spaced gamma ray detector per sector, and recording the number of gamma ray counts of said long spaced gamma ray detector per sector [c25] A method for determining hydrogen index of a mud mixture surrounding a drilling tool within a borehole in which said drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying neutrons into said mud mixture from a radiation source;
recording, with respect to angular position of said tool with respect to the borehole a count rate of neutrons which return to the tool which result from interaction with said mud mixture; and determining at least a hydrogen index of the mud mixture from the count rate of neutrons for the at least one more of the angular sectors of said borehole.
[c26] The method of claim 25, further comprising defining a plurality of additional angular sectors around the borehole, and wherein an indication of the hydrogen index of said mud mixture is derived for at least one of said plurality of additional sectors.
[c27] The method of claim 25, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises gamma radiation which results from interaction of said neutrons with said mud mixture.
[c28] A method for determining salinity of a mud mixture within a borehole in which a drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying neutrons into said mud mixture from a radiation source;
recording, with respect to angular position of said tool with respect to the borehole a count rate of neutrons which return to the tool which result from interaction with said mud mixture;
determining at least a salinity of the mud mixture from the count rate of neutrons for the at least one more of the sectors of said borehole.
[c29] The method of claim 28, further comprising defining a plurality of additional angular sectors around the borehole and wherein an indication of the salinity of said mud mixture is derived for at least one of said additional sectors.
[c30] The method of claim 28, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c31] A method for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received, comprising:
defining a cross-section of said borehole which is orthogonal to a longitudinal axis of said tool;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a plurality of azimuthally distributed sensors disposed in said tool from a plurality of locations around said borehole;
separating said cross-section into at least a first sector and a second sector, wherein a first measurement signal from ones of said sensors disposed in said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from ones of said sensors disposed in said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation; and deriving an indication of an intrinsic characteristic of said mud mixture from said first measurement signals associated with the first sector of said borehole.
[c32] The method of claim 31 further comprising defining a plurality of additional angular sectors around the borehole and wherein an indication of a characteristic of said mud mixture is derived for at least one of said additional sectors.
[c33] The method of claim 31, wherein said intrinsic characteristic is selected from the group consisting of density, hydrogen index, salinity, sigma, neutron slowing down length, neutron slowing down time, compositional information from neutron induced gamma ray spectroscopy, and photoelectric effect.
[c34] The method of claim 31 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c35] The method of claim 31, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c36] The method of claim 31 wherein at least one neutron gamma process is used to derive the indication of the intrinsic characteristic of said mud mixture.
[c37] The method of claim 31 wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c38] The method of claim 31 wherein said energy applied into said borehole comprises ultrasonic pulses, and said returning energy comprises ultrasonic pulses which interact with said mud mixture.
[c39] The method of claim 31 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording an identity of each one of the sectors that ones of said sensors are in while said tool is turning in said borehole, and recording a number of gamma ray counts in a plurality of energy windows for gamma rays detected by each of said sensors occurring in each one of the sectors.
[c40] The method of claim 39 wherein said sensors comprise short and long spaced gamma ray detectors axially spaced from an energy source which emits gamma rays, and further comprising, recording a number of gamma ray counts of said short spaced gamma ray detector per sector, and recording a number of gamma ray counts of said long spaced gamma ray detector per sector.
[c41] The method of claim 40 wherein said intrinsic characteristic is selected from the group consisting of density and photoelectric effect.
[c1] A method for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received, comprising:
turning said tool in said borehole;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a sensor disposed in said tool from a location around said borehole;
separating a cross-section of the borehole substantially perpendicular to a longitudinal axis of the borehole into at least a first sector and a second sector, wherein a first measurement signal from said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation; and deriving an indication of an intrinsic characteristic of said mud mixture from said first measurement signal associated with the first sector of said borehole.
[c2] The method of claim 1, wherein an indication of a characteristic of said mud mixture is derived for at least two of said sectors.
[c3] The method of claim 1, wherein said intrinsic characteristic is selected from the group consisting of density, hydrogen index, salinity, sigma, neutron slowing down length, neutron slowing down time, compositional information from neutron induced gamma ray spectroscopy, and photoelectric effect.
[c4] The method of claim 1 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c5] The method of claim 1 wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c6] The method of claim 1 wherein at least one neutron gamma process is used to derive the indication of the intrinsic characteristic of said mud mixture.
[c7] The method of claim 1 wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c8] The method of claim 1 wherein the first sector includes a point opposite in the wellbore to a point defined by intersection of earth's gravity vector with said cross section.
[c9] The method of claim 1 wherein said energy applied into said borehole comprises ultrasonic pulses, and said returning energy comprises ultrasonic pulses which interact with said mud mixture.
[c10] The method of claim 1 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording the identity of each one of the sectors that said sensor is in while said tool is turning in said borehole, and recording the number of gamma ray counts in a plurality of energy windows of said sensor occurring in each one of the sectors.
[c11] The method of claim 10 wherein said sensor comprises short and long spaced gamma ray detectors spaced from an energy source which emits gamma rays, and further comprising, recording the number of gamma ray counts of said short spaced gamma ray detector per sector, and recording the number of gamma ray counts of said long spaced gamma ray detector per sector.
[c12] The method of claim 11 wherein said intrinsic characteristic is selected from the group consisting of density and photoelectric effect.
[c13] A method for determining density of a mud mixture within a borehole in which a drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying gamma rays into said mud mixture from a radiation source;
recording, with respect an angular position of said tool with respect to the borehole a count rate of gamma rays which return to the tool which result from interaction with said mud mixture;
determining at least a density of the mud mixture from the count rate of gamma rays for the at least one more of the sectors.
[c14] The method of claim 13 further comprising, defining other angular sectors of said tool about said borehole, and determining the density of the mud mixture for a plurality of said angular-sectors from the gamma ray count rates which occur solely within each of said angular sectors about said borehole.
[c15] The method of claim 13 further comprising, determining the density of the mud mixture for each of said at least more of the sectors from the gamma ray count rates which occur solely within said angular sectors about said borehole.
[c16] The method of claim 13 wherein the gamma ray counts are recorded with respect to the energy levels thereof, the energy levels segregated into at least one hard window range wherein gamma rays detected are related to density; and at least one soft window range wherein gamma rays detected are related to photoelectric effect.
[c17] A method for determining a photoelectric effect (PEF) of a mud mixture within a borehole in which a tool is received, said tool including a source of radiation and a gamma ray detector, the method comprising:
turning said tool in said borehole;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a sensor disposed in said tool from locations azimuthally distributed around said borehole;
separating a cross-section of the borehole substantially perpendicular to a longitudinal axis of the borehole into at least a first sector and a second sector, wherein a first measurement signal from said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation;
determining a density (.rho.), of the mud mixture, calculated from said first measurement signal;
determining a macroscopic cross section (U), of the mud mixture from said first measurement signal, and determining the PEF of said mud mixture as a ratio of said macroscopic cross section to said density, that is, PEF = U / .rho..
[c18] The method of claim 17, wherein an indication of the PEF of said mud mixture is derived for at least two of said sectors.
[c19] The method of claim 17, wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c20] The method of claim 17, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c21] The method of claim 17, wherein at least one neutron gamma process is used to derive the indication of the PEF of said mud mixture.
[c22] The method of claim 17, wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c23] The method of claim 17, wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording the identity of each one of the sectors that said sensor is in while said tool is turning in said borehole, and recording the number of gamma ray counts in a plurality of energy windows of said sensor occurring in each one of the sectors.
[c24] The method of claim 23 wherein said sensor comprises short and long spaced gamma ray detectors spaced from an energy source which emits gamma rays, and further comprising, recording the number of gamma ray counts of said short spaced gamma ray detector per sector, and recording the number of gamma ray counts of said long spaced gamma ray detector per sector [c25] A method for determining hydrogen index of a mud mixture surrounding a drilling tool within a borehole in which said drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying neutrons into said mud mixture from a radiation source;
recording, with respect to angular position of said tool with respect to the borehole a count rate of neutrons which return to the tool which result from interaction with said mud mixture; and determining at least a hydrogen index of the mud mixture from the count rate of neutrons for the at least one more of the angular sectors of said borehole.
[c26] The method of claim 25, further comprising defining a plurality of additional angular sectors around the borehole, and wherein an indication of the hydrogen index of said mud mixture is derived for at least one of said plurality of additional sectors.
[c27] The method of claim 25, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises gamma radiation which results from interaction of said neutrons with said mud mixture.
[c28] A method for determining salinity of a mud mixture within a borehole in which a drilling tool is received, comprising:
defining a bottom angular sector of said borehole;
defining at least one more angular sector of said borehole;
applying neutrons into said mud mixture from a radiation source;
recording, with respect to angular position of said tool with respect to the borehole a count rate of neutrons which return to the tool which result from interaction with said mud mixture;
determining at least a salinity of the mud mixture from the count rate of neutrons for the at least one more of the sectors of said borehole.
[c29] The method of claim 28, further comprising defining a plurality of additional angular sectors around the borehole and wherein an indication of the salinity of said mud mixture is derived for at least one of said additional sectors.
[c30] The method of claim 28, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c31] A method for determining a characteristic of a mud mixture surrounding a drilling tool within a borehole in which a drilling tool is received, comprising:
defining a cross-section of said borehole which is orthogonal to a longitudinal axis of said tool;
applying energy into said borehole from an energy source disposed in said tool;
recording measurement signals received at a plurality of azimuthally distributed sensors disposed in said tool from a plurality of locations around said borehole;
separating said cross-section into at least a first sector and a second sector, wherein a first measurement signal from ones of said sensors disposed in said first sector is substantially in response to returning energy which results from the interaction of the applied energy with said mud mixture; and a second measurement signal from ones of said sensors disposed in said second sector is substantially in response to returning energy which results from the interaction of the applied energy with said formation; and deriving an indication of an intrinsic characteristic of said mud mixture from said first measurement signals associated with the first sector of said borehole.
[c32] The method of claim 31 further comprising defining a plurality of additional angular sectors around the borehole and wherein an indication of a characteristic of said mud mixture is derived for at least one of said additional sectors.
[c33] The method of claim 31, wherein said intrinsic characteristic is selected from the group consisting of density, hydrogen index, salinity, sigma, neutron slowing down length, neutron slowing down time, compositional information from neutron induced gamma ray spectroscopy, and photoelectric effect.
[c34] The method of claim 31 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture.
[c35] The method of claim 31, wherein said energy applied into said borehole comprises neutrons, and said returning energy comprises radiation which results from interaction of said neutrons with said mud mixture.
[c36] The method of claim 31 wherein at least one neutron gamma process is used to derive the indication of the intrinsic characteristic of said mud mixture.
[c37] The method of claim 31 wherein said second sector includes a point defined by intersection of earth's gravity vector with said cross section.
[c38] The method of claim 31 wherein said energy applied into said borehole comprises ultrasonic pulses, and said returning energy comprises ultrasonic pulses which interact with said mud mixture.
[c39] The method of claim 31 wherein said energy applied into said borehole comprises gamma rays, and said returning energy comprises gamma rays which result from interaction with said mud mixture, the method further comprising, recording an identity of each one of the sectors that ones of said sensors are in while said tool is turning in said borehole, and recording a number of gamma ray counts in a plurality of energy windows for gamma rays detected by each of said sensors occurring in each one of the sectors.
[c40] The method of claim 39 wherein said sensors comprise short and long spaced gamma ray detectors axially spaced from an energy source which emits gamma rays, and further comprising, recording a number of gamma ray counts of said short spaced gamma ray detector per sector, and recording a number of gamma ray counts of said long spaced gamma ray detector per sector.
[c41] The method of claim 40 wherein said intrinsic characteristic is selected from the group consisting of density and photoelectric effect.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24533500P | 2000-11-02 | 2000-11-02 | |
| US60/245,335 | 2000-11-02 | ||
| US10/040,701 | 2001-10-26 | ||
| US10/040,701 US6648083B2 (en) | 2000-11-02 | 2001-10-26 | Method and apparatus for measuring mud and formation properties downhole |
| PCT/IB2001/002847 WO2002048499A2 (en) | 2000-11-02 | 2001-11-02 | Method and apparatus for measuring mud and formation properties downhole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2424514A1 true CA2424514A1 (en) | 2002-06-20 |
| CA2424514C CA2424514C (en) | 2011-01-04 |
Family
ID=26717307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2424514A Expired - Fee Related CA2424514C (en) | 2000-11-02 | 2001-11-02 | Method and apparatus for measuring mud and formation properties downhole |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6648083B2 (en) |
| CA (1) | CA2424514C (en) |
| GB (1) | GB2391308B (en) |
| NO (2) | NO324295B1 (en) |
| WO (1) | WO2002048499A2 (en) |
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| US7284605B2 (en) * | 2004-09-28 | 2007-10-23 | Schlumberger Technology Corporation | Apparatus and methods for reducing stand-off effects of a downhole tool |
| US7619007B2 (en) | 2004-11-23 | 2009-11-17 | Adamas Pharmaceuticals, Inc. | Method and composition for administering an NMDA receptor antagonist to a subject |
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| NO20031975D0 (en) | 2003-04-30 |
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