WO2009082551A2 - Imagerie élémentaire azimuthale - Google Patents

Imagerie élémentaire azimuthale Download PDF

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Publication number
WO2009082551A2
WO2009082551A2 PCT/US2008/082780 US2008082780W WO2009082551A2 WO 2009082551 A2 WO2009082551 A2 WO 2009082551A2 US 2008082780 W US2008082780 W US 2008082780W WO 2009082551 A2 WO2009082551 A2 WO 2009082551A2
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WO
WIPO (PCT)
Prior art keywords
gamma rays
measurements
formation
earth formation
processor
Prior art date
Application number
PCT/US2008/082780
Other languages
English (en)
Other versions
WO2009082551A9 (fr
WO2009082551A3 (fr
Inventor
Andrew D. Kirkwood
Philip L. Kurkoski
Richard Pemper
Original Assignee
Baker Hughes Incorporated
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
Priority claimed from US11/936,203 external-priority patent/US7880134B2/en
Priority claimed from US12/264,829 external-priority patent/US8269162B2/en
Priority claimed from US12/264,821 external-priority patent/US8049164B2/en
Application filed by Baker Hughes Incorporated filed Critical Baker Hughes Incorporated
Priority to GB1007636.2A priority Critical patent/GB2467071B/en
Priority to BRPI0820294-0A priority patent/BRPI0820294A2/pt
Publication of WO2009082551A2 publication Critical patent/WO2009082551A2/fr
Publication of WO2009082551A9 publication Critical patent/WO2009082551A9/fr
Publication of WO2009082551A3 publication Critical patent/WO2009082551A3/fr
Priority to NO20100680A priority patent/NO20100680L/no

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/06—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging for detecting naturally radioactive minerals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of ionising 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 ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
    • G01V5/08—Prospecting or detecting by the use of ionising 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 ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
    • G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
    • G01V5/102—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole the neutron source being of the pulsed type

Definitions

  • the present disclosure relates generally to devices, systems, and methods of geological exploration in wellbores. More particularly, the present disclosure describes a device, a system, and a method useful for producing a lithology image of an earth formation in a borehole during drilling.
  • a variety of techniques are currently utilized in determining the presence and estimation of quantities of hydrocarbons (oil and gas) in earth formations. These methods are designed to determine formation parameters, including, among other things, the resistivity, porosity, and permeability of the rock formation surrounding the wellbore drilled for recovering the hydrocarbons.
  • the tools designed to provide the desired information are used to log the wellbore. Much of the logging is done after the wellbores have been drilled. More recently, wellbores have been logged while drilling, which is referred to as measurement-while-drilling (MWD) or logging-while-drilling (LWD).
  • MWD measurement-while-drilling
  • LWD logging-while-drilling
  • MWD techniques are that the information about the rock formation is available at an earlier time when the formation is not yet damaged by an invasion of the drilling mud.
  • MWD logging may often deliver better formation evaluation (FE) data quality.
  • FE formation evaluation
  • having the formation evaluation (FE) data available already during drilling may enable the use of the FE data to influence decisions related to the ongoing drilling (such as geo-steering, for example).
  • Yet another advantage is the time saving and, hence, cost saving if a separate wireline logging run can be avoided.
  • a drawback of these imaging methods is that while they reveal structural information about the earth formation, they provide little or no information about the formation mineral composition.
  • the present disclosure addresses this deficiency and enables a more complete lithologic characterization of earth formations using MWD techniques.
  • One embodiment of the disclosure is an apparatus configured to estimate an elemental composition of an earth formation.
  • the apparatus includes at least one radiation detector configured to be conveyed in a borehole and make a plurality of measurements of gamma rays; and at least one processor configured to associate an azimuth with each of the plurality of measurements of gamma rays; and estimate, from the plurality of measurements, an elemental composition of the earth formation for the plurality of azimuths.
  • Another embodiment of the disclosure is a method of estimating an elemental composition of an earth formation.
  • the method includes making a plurality of measurements of gamma rays in a borehole; associating an azimuth with each of the plurality of measurements of gamma rays; and processing the plurality of measurements of gamma rays for estimating an elemental composition of the earth formation for the plurality of azimuths.
  • Another embodiment is a computer readable medium accessible to at least one processor.
  • the computer-readable medium includes instructions that enable the a least one processor to associate an azimuth with each of a plurality of measurements of gamma rays made by a radiation detector in a borehole in an earth formation; and estimate an elemental composition of the earth formation for each of the plurality of azimuths.
  • the medium may include a ROM, an EPROM, an EEPROM, a flash memory and/or an optical disk.
  • FIG. 1 schematically illustrates a drilling system suitable for use with the present disclosure
  • FIG, 2 is a cross section elevation view of a tool portion used in the system of
  • FIG. 1; FIGS. 3A and 3B are cross section top views of the tool portion of FIG. 3 to show two arrangement of the detector;
  • FIG. 4 shows the basic timing of the pulsed neutron source and the produced gamma rays
  • FIG. 5 shows the timing of the background gate
  • FIG. 6 shows capture and inelastic spectra from limestone formation with oil-filled borehole
  • FIG. 7 shows the spatial distribution of data bins generated by the example tool OfFlG. 2;
  • FIG. 1 is an elevation view of a simultaneous drilling and logging system that incorporates an embodiment of the present disclosure.
  • a borehole 102 is drilled into the earth under control of surface equipment including a rotary drilling rig 104.
  • rig 104 includes a derrick 106, derrick floor 108, draw works 110, hook 112, kelly joint 114, rotary table 116, and drill string 118.
  • the drill string 118 includes drill pipe 120 secured to the lower end of the kelly joint 114 and to the upper end of a section comprising a plurality of drill collars.
  • the drill collars include not separately shown drill collars such as an upper drill collar, an intermediate sub drill collar, and a lower drill collar bottomhole assembly (BHA) 121 immediately below the intermediate sub.
  • the lower end of the BHA 121 carries a downhole tool 122 of the present disclosure and a drill bit 124.
  • Drilling fluid 126 is circulated from a mud pit 128 through a mud pump 130, past a desurger 132, through a mud supply line 134, and into a swivel 136.
  • the drilling fluid 126 flows down through the kelly joint 114 and a longitudinal central bore in the drill string, and through jets (not shown) in the lower face of the drill bit.
  • Return fluid 138 containing drilling mud, cuttings and formation fluid flows back up through the annular space between the outer surface of the drill string and the inner surface of the borehole to be circulated to the surface where it is returned to the mud pit through a mud return line 142.
  • a shaker screen (not shown) separates formation cuttings from the drilling mud before the mud is returned to the mud pit.
  • the system in FIG. 1 may use any conventional telemetry methods and devices for communication between the surface and downhole components.
  • mud pulse telemetry techniques are used to communicate data from down hole to the surface during drilling operations.
  • To receive data at the surface there is a transducer 144 in mud supply line 132. This transducer generates electrical signals in response to drilling mud pressure variations, and a surface conductor 146 transmits the electrical signals to a surface controller 148.
  • the drill string 118 can have a downhole drill motor 150 for rotating the drill bit 124.
  • the downhole tool 122 of the present disclosure is the downhole tool 122 of the present disclosure.
  • a telemetry system 152 is located in a suitable location on the drill string 118 such as above the tool 122. The telemetry system 152 is used to receive commands from, and send data to, the surface via the mud-pulse telemetry described above.
  • the surface controller 148 may contain a computer, memory for storing data, data recorder and other peripherals.
  • the surface controller 148 also responds to user commands entered through a suitable device, such as a keyboard.
  • the BHA 121 contains various sensors and LWD devices to provide information about the formation, downhole drilling parameters and the mud motor.
  • the downhole assembly 121 may be modular in construction, in that the various devices are interconnected sections so that the individual sections may be replaced when desired.
  • the BHA 121 also may contain sensors and devices in addition to the above-described sensors. Such devices include a device for measuring the formation resistivity near and/or in front of the drill bit, a gamma ray device for measuring the formation gamma ray intensity and devices for determining the inclination and azimuth of the drill string.
  • the BHA 121 of the present disclosure includes a tool 122, which contains a nuclear device for providing information usefiil for evaluating and testing subsurface formations along the borehole 122.
  • the nuclear device includes a pulsed neutron source and two detectors for measuring resulting gamma rays. In use, high energy neutrons are emitted into the surrounding formation. This is discussed further below,
  • FIG.2 illustrates an embodiment of the present disclosure for logging while drilling (LWD). Shown in cross section is a tool portion 200.
  • the tool portion 200 is, for example, a drill collar or a bottom-hole assembly (BHA) 121 described above and shown in FIG. 1.
  • the tool portion 200 may include a cylindrical body 202 having a central bore 204 for allowing drilling fluid to flow through the tool.
  • a pulsed neutron source 210 is disposed in the tool body 202, and one or more detectors 206 and 208 are disposed in the tool body 202 for detecting gamma rays resulting from scattering by nuclei in the earth formation of neutrons from the neutron source 210.
  • a first (SS) detector (short-spaced detector) 206 is disposed in the tool body 202 axially displaced from the neutron source 210.
  • a second detector (LS or far detector) 208 is disposed in the wall axially displaced from the first detector 206 and from the neutron source 310.
  • the tool portion 200 might include a non-rotating sleeve 156 to house the detectors 206 and 208.
  • the tool portion can likewise include one or more extendable elements 154 such as extendable probes or extendable steering blades for housing the detectors 206 and 208 and to enable moving the detectors toward the borehole wall.
  • extendable elements 154 such as extendable probes or extendable steering blades for housing the detectors 206 and 208 and to enable moving the detectors toward the borehole wall.
  • the detectors might also be in a fixed stabilizer 158.
  • FIG. 3A is a top view in cross section to show one embodiment of the detector.
  • the detector 208 is shown with a substantially planar detection surface 302 oriented outwardly with respect to the tool center and a substrate 304 oriented inwardly toward the central bore 204.
  • FIG.3B shows an embodiment of the present disclosure having multiple planar detection surfaces 302", 302", and 302'". The detection surfaces are arranged to provide multiple planes angularly displaced to provide more capture surface area.
  • the LS and SS detectors 202 and 208 are comprised of bismuth-germanate (BGO) crystals coupled to photomultiplier tubes.
  • Brilliance 380TM crystals of LaB ⁇ iCe provided by Saint- Gobain Crystals is used.
  • the detector system may be mounted in a Dewar-type flask.
  • the source comprises a pulsed neutron source using a D-T reaction wherein deuterium ions are accelerated into a tritium target, thereby generating neutrons having an energy of approximately 14 MeV.
  • An important feature of the present disclosure is the use of collimated sources and detectors.
  • the collimation may be achieved by the eccentric positioning of the source and detectors, use of shielding, or combination of these approaches.
  • a Boron-coated Tungsten shield is used. Using these or other approaches known in the art, the azimuthal sensitivity of the tool may be increased.
  • FIG. 4 illustrates the basic timing of the pulsed neutron source and the produced gamma rays. Time is displayed along the x-axis in microseconds. The gamma ray counts per second (cps) is displayed along the y-axis. The neutron burst defines a first-detector-gate interval, referred to as the "burst gate" or inelastic gate. Typically a total spectrum of gamma rays resulting from both inelastic neutron scattering and capture gamma ray scattering are produced during the active duration of the neutron source, and the timing of the inelastic gate enables obtaining the total spectrum. In the example of FIG.4, the number of counts rises significantly
  • the deactivation of the neutron source causes the inelastic gamma rays to disappear from the count almost immediately.
  • This interval 402-403 is shown at a point substantially coincident with deactivation of the neutron source, and extends approximately from 40 ⁇ s to 50 ⁇ s.
  • the counts obtained during this interval are attributable to both inelastic and capture gamma rays, and is followed by a "capture gate" 401.
  • the capture gate contains gamma rays substantially due to captured neutrons of the surrounding formation.
  • a background gate discussed next, is used to correct the spectra of the capture gate and the inelastic gates.
  • energized neutrons are injected from a pulsed neutron source 209 into a surrounding formation.
  • the scintillation detector records the spectrum over a predetermined time interval.
  • a total spectrum of gamma rays is obtained from the formation layer.
  • a capture spectrum of gamma rays is obtained from the formation layer.
  • a determinable factor of the capture spectrum can be subtracted from the obtained total spectrum to derive a spectrum substantially representative of an inelastic spectrum only.
  • the elemental contribution to the inelastic spectrum and the capture spectrum can then be determined by determining a first constituent spectrum from the inelastic spectrum and a second constituent spectrum from the capture spectrum. An operator versed in the arts can then use the determined elemental contributions to determine a parameter of the surrounding formation.
  • the derived gamma ray energy spectra for data analysis comprise both the capture spectrum and the inelastic spectrum.
  • An inelastic gamma ray is generated from the nucleus of the atom from which there is a scattering of initial highly energetic neutrons.
  • a capture gamma ray is emitted by the nucleus of an atom through absorption of a neutron after its energy has diminished.
  • FIG.6 shows exemplary capture and inelastic spectra from limestone formation with oil-filled borehole. The three spectra are the inelastic spectrum 601, the capture spectra 602, and the background spectrum 603.
  • a feature of the present disclosure is the analysis of separate inelastic and capture spectra in terms of their constituent spectra.
  • Prior art discusses methods for removing the effects of a capture spectrum from a total spectrum obtained during a burst gate, consequently obtaining an improved inelastic spectrum.
  • a corrected fraction of the capture spectrum is subtracted from the total spectrum in order to generate a representative inelastic spectrum.
  • the corrected fraction is referred to as the capture subtraction factor.
  • the method for calculating this value comprises using a capture gamma ray response function to estimate the capture and inelastic components within a recorded time spectrum. Analysis of the spectra can be performed uphole or downhole and may be done using a processor or expert system.
  • a library of elemental basis functions can be used to enable a decomposition of at least one of capture and inelastic spectra into their respective constituent spectra.
  • a partial list of elements includes Ca, Cl, Fe, Mg and Si.
  • constituent spectra representing 20 elements are usable in the present disclosure. When the fraction of a particular element obtained from both the capture and inelastic spectrum are reasonably close, then their average value may be used for the elemental analysis. Large differences between estimates for a particular element obtained by capture and inelastic spectral decomposition should serve as a cautionary flag.
  • the elements that can be readily measured from the capture gamma ray energy spectrum comprise Ca, Cl, H, Fe, Mg, Si, and S.
  • the elements that can be readily measured from the inelastic gamma ray energy spectrum comprise C, Ca, Fe, Mg, O, Si, and S.
  • United States Patent 7,402,797 to Pemper et al. having the same assignee as the present disclosure and the contents of which are incorporated herein by reference, teaches the determination of Aluminum concentration in the earth formation. The list is not intended to be complete and other elements could also be identified.
  • Table 1 summarizes the appearance of several elements readily identifiable in both capture and inelastic spectra. In some cases, the same element can be found in both the capture and inelastic spectra. Those elements found in both the capture and inelastic spectra further aid a log analyst in the final scientific interpretation of the data.
  • a gamma ray spectrum is extracted for an individual element, it can be used as an elemental standard. These standards are determinable, for example, using a combination of empirical data from known formations in the Nuclear Instrument Characterization Center, and using computer simulations employing detailed physical modeling techniques. The combination of these standards that results in the best fit to the measured spectra determines the elemental yields.
  • Madigan In the context of wireline logging, Madigan teaches the process of going from Table 1 (the elemental analysis) to Table 2 (the mineralogical makeup of the rock) by a Linear Programming (LP) programming approach.
  • LP Linear Programming
  • a set of possible mineral constituents of the formation is defined.
  • a constrained LP approach is used to find the fraction of each of the possible mineral constituents that has the determined elemental analysis.
  • using the tool with azimutha! sensitivity discussed above it is possible to get high resolution estimates of the formation mineralogy during drilling as a function of depth and azimuth.
  • the BHA is provided with a suitable orientation sensor such as a magnetometer. The measurements are made with sufficient resolution in azimuth and depth.
  • the signal-to-noise ratio (SNR) using the azimuthally sensitive tool discussed above is likely to be poor.
  • SNR signal-to-noise ratio
  • An advantage of MWD measurements is the ability to stack measurements into azimuthal bins over successive rotations of the tool and thus improve the SNR. This is discussed below with reference to FIG. 7.
  • the binning is not to be construed as a limitation: all that is really needed is the ability to associate an azimuth with each measurement.
  • the measurements may also be used to estimate the photoelectric factor (Pe).
  • Pe is commonly derived from the ratio of detected gamma counts in a high-energy (hard) window and low energy (soft) window of a spectrum recorded at a detector.
  • the Pe may be computed from either detector. However, the near detector is generally used due to its better collimation and better statistics.
  • the resulting value is a direct function of the aggregate atomic number (Z) of the elements in the formation, and so is a sensitive indicator of mineralogy.
  • the photoelectric factor is commonly scaled on a range between 0 and 10 b/e. Common reservoir mineral reference values are: quartz 1.81; dolomite 3.14; and calcite 5.08 b/e.
  • standoff corrections may be made in the determination of Pe by using a suitable caliper measurement.
  • FIG. 7 illustrates how the data is spatially divided into azimuthal sectors. Details of borehole surveying methods would be known to those versed in the art and are not discussed here. The accumulation of data into azimuthal sectors is discussed, for example, in US 7,000,700 to Cairns et al, having the same assignee as the present disclosure and the contents of which are incorporated herein by reference. In the example shown in FIG. 7, the measurements (and the estimated mineralogy and/or estimated elemental composition) are partitioned into sixteen azimuthal sectors. This is not to be construed as a limitation.
  • measurements are made with two detectors.
  • An auxiliary detector is provided that is responsive primarily to gamma rays from the borehole fluid. This is relatively easy to do in wireline applications: the standoff is determined from caliper measurements, and FE measurements made with a large standoff that are responsive primarily to borehole fluid signals are used. For MWD applications, this is more problematic. Two approaches may be taken. In one, gamma ray measurements are made in the central bore of the drillstring: an auxiliary pulsed neutron source on the central bore may be used. This has the disadvantage that properties of drilling fluid in the annulus between the drill collar and the borehole wall would not be measured.
  • the auxiliary gamma ray detector may be collimated and/or shielded to be responsive to gamma rays arriving in a generally axial direction from the pulsed neutron source. Since the pulsed neutron source is configured for azimuthal sensitivity, an auxiliary pulsed neutron source may be used. The spectrum measured in this fashion can then be subtracted from the measurements made by the main detector to provide a borehole corrected spectral measurement (and elemental composition, mineralogical composition, etc.).
  • Another embodiment of the disclosure uses natural gamma ray measurements measured by a detector of the type discussed above, so that measurements of natural gamma rays may be used, either by themselves or in combination with the capture and I S inelastic spectra discussed above.
  • the elemental composition of Th, U and K for a plurality of different azimuths can be estimated from the method described above.
  • the natural gamma ray measurements by themselves are not sufficient to proceed to the next step, viz, 5 mineralogy.
  • K is not listed in Table I as being readily identifiable using capture spectra and inelastic spectra. The reason is that K has a capture spectrum that is very hard to distinguish from the spectrum of Gadolinium (Gd). On the other hand, Gd does not contribute to the natural gamma ray spectrum.
  • the method described above may also be carried out using a logging string conveyed on a wireline provided the logging tool is provided with a motor drive for providing a 360° scan of the formation.
  • the BHA and the logging string may be referred to as a downhole assembly.
  • the processing of the data may be done by a downhole processor to give corrected measurements substantially in real time. Implicit in the control and processing of the data is the use of a computer program on a suitable machine readable medium that enables the processor to perform the control and processing.
  • the machine readable medium may include ROMs, EPROMs, EEPROMs, Flash Memories and Optical disks. Such media may also be used to store results of the processing discussed above.

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  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

Selon l'invention, des mesures effectuées par un outil à rayons gamma naturels sont utilisées pour obtenir une composition élémentaire d'une formation géologique. Des mesures supplémentaires, effectuées au moyen d'un outil à neutrons pulsés doté d'au moins deux détecteurs de rayons gamma, sont utilisées pour obtenir une image minéralogique et/ou élémentaire d'une formation géologique, laquelle image pouvant être utilisée pour naviguer dans un réservoir et pour mieux comprendre la géologie d'une zone de prospection.
PCT/US2008/082780 2007-11-07 2008-11-07 Imagerie élémentaire azimuthale WO2009082551A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1007636.2A GB2467071B (en) 2007-11-07 2008-11-07 Azimuthal elemental imaging
BRPI0820294-0A BRPI0820294A2 (pt) 2007-11-07 2008-11-07 Geração de imagem elementar azimutal
NO20100680A NO20100680L (no) 2007-11-07 2010-05-11 Asimutisk grunnstoffavbilding

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US11/936,203 US7880134B2 (en) 2007-11-07 2007-11-07 Azimuthal elemental imaging
US11/936,203 2007-11-07
US12/264,829 US8269162B2 (en) 2007-11-07 2008-11-04 Azimuthal elemental imaging
US12/264,821 2008-11-04
US12/264,821 US8049164B2 (en) 2007-11-07 2008-11-04 Azimuthal elemental imaging
US12/264,829 2008-11-04

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WO2009082551A2 true WO2009082551A2 (fr) 2009-07-02
WO2009082551A9 WO2009082551A9 (fr) 2009-08-20
WO2009082551A3 WO2009082551A3 (fr) 2010-04-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012244198A1 (en) * 2011-10-27 2013-05-16 Weatherford Technology Holdings, Llc Neutron logging tool with multiple detectors
US8803076B1 (en) 2013-06-14 2014-08-12 Leam Drilling Systems, Llc Multiple gamma controller assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107505661B (zh) * 2017-07-25 2019-06-04 中国石油大学(华东) 一种可控中子三探测器元素测井装置及方法

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Publication number Priority date Publication date Assignee Title
US5539225A (en) * 1994-09-16 1996-07-23 Schlumberger Technology Corporation Accelerator-based methods and apparatus for measurement-while-drilling
US20050199794A1 (en) * 2004-03-15 2005-09-15 Medhat Mickael Spectral gamma ray logging-while-drilling system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5539225A (en) * 1994-09-16 1996-07-23 Schlumberger Technology Corporation Accelerator-based methods and apparatus for measurement-while-drilling
US20050199794A1 (en) * 2004-03-15 2005-09-15 Medhat Mickael Spectral gamma ray logging-while-drilling system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2012244198A1 (en) * 2011-10-27 2013-05-16 Weatherford Technology Holdings, Llc Neutron logging tool with multiple detectors
AU2012244198B2 (en) * 2011-10-27 2014-06-05 Weatherford Technology Holdings, Llc Neutron logging tool with multiple detectors
US9012836B2 (en) 2011-10-27 2015-04-21 Weatherford Technology Holdings, Llc Neutron logging tool with multiple detectors
US8803076B1 (en) 2013-06-14 2014-08-12 Leam Drilling Systems, Llc Multiple gamma controller assembly

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GB2466901B (en) 2012-10-24
NO20100681L (no) 2010-08-06
GB201007546D0 (en) 2010-06-23
GB201007636D0 (en) 2010-06-23
GB2466901A (en) 2010-07-14
WO2009082551A9 (fr) 2009-08-20
WO2009082552A2 (fr) 2009-07-02
GB2467071B (en) 2012-05-30
BRPI0820294A2 (pt) 2015-05-26
BRPI0820292A2 (pt) 2015-05-26
WO2009082551A3 (fr) 2010-04-08
GB2467071A (en) 2010-07-21
WO2009082552A3 (fr) 2010-06-17
NO20100680L (no) 2010-08-06
WO2009082552A9 (fr) 2009-08-20

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