EP1605281B1 - Instrument de diagraphie de puits avec blindage de protection contre les rayonnements et procédé de mesure - Google Patents

Instrument de diagraphie de puits avec blindage de protection contre les rayonnements et procédé de mesure Download PDF

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Publication number
EP1605281B1
EP1605281B1 EP04291261A EP04291261A EP1605281B1 EP 1605281 B1 EP1605281 B1 EP 1605281B1 EP 04291261 A EP04291261 A EP 04291261A EP 04291261 A EP04291261 A EP 04291261A EP 1605281 B1 EP1605281 B1 EP 1605281B1
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EP
European Patent Office
Prior art keywords
radiation
tool
source
detector
collar
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.)
Expired - Lifetime
Application number
EP04291261A
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German (de)
English (en)
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EP1605281A1 (fr
Inventor
Laurent Labous
Christian Stoller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Services Petroliers Schlumberger SA
Gemalto Terminals Ltd
Schlumberger Technology BV
Schlumberger Holdings Ltd
Original Assignee
Services Petroliers Schlumberger SA
Gemalto Terminals Ltd
Schlumberger Technology BV
Schlumberger Holdings 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 Services Petroliers Schlumberger SA, Gemalto Terminals Ltd, Schlumberger Technology BV, Schlumberger Holdings Ltd filed Critical Services Petroliers Schlumberger SA
Priority to DE602004001045T priority Critical patent/DE602004001045T2/de
Priority to EP04291261A priority patent/EP1605281B1/fr
Priority to AT04291261T priority patent/ATE328294T1/de
Priority to CA2506133A priority patent/CA2506133C/fr
Priority to GB0509221A priority patent/GB2414296A/en
Priority to US11/127,570 priority patent/US7285772B2/en
Publication of EP1605281A1 publication Critical patent/EP1605281A1/fr
Application granted granted Critical
Publication of EP1605281B1 publication Critical patent/EP1605281B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00—Survey of boreholes or wells
    • E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
    • E21B47/017—Protecting measuring instruments

Definitions

  • This invention relates to logging of oil, water or gas well in underground formations surrounding a borehole and more particularly to a logging tool with a parasitic radiation shield such as a logging-while-drilling gamma ray density measurement tool.
  • Formation properties while drilling or in a freshly drilled hole are measured to predict the presence of oil, gas and water in the formation.
  • These formation properties may be logged with wireline tools, logging while drilling (LWD) tools, or measurement while drilling (MWD) tools.
  • LWD logging while drilling
  • MWD measurement while drilling
  • One method to predict formation properties is to measure the density of material in earth formation using a source of nuclear radiation and a radiation detector. The density of a material can be determined either by a transmission or by a scattering measurement. In a transmission measurement the material, the density of which needs to be determined, is put between the radiation source and the detector.
  • Gamma-ray scattering systems have been used for many years to measure the density of a material penetrated by a borehole. Typically density is measured as a function of position along the borehole thereby yielding a "log" as a function of depth within the borehole.
  • the measuring tool typically comprises a source of radiation and one or more radiation detectors, which are in the same plane as the source and typically, mounted within a pressure tight container. Radiation impinges on and interacts with the material, and a fraction of the impinging radiation is scattered by the material and a fraction thereof will return to the detector. After appropriate system calibration, the intensity of the detected scattered radiation can be related to the bulk density of the material.
  • the radial sensitivity of the density measuring system is affected by several factors such as the energy of the gamma radiation emitted by the source, the axial spacing between the source and the one or more gamma ray detectors, and the properties of the borehole and the formation.
  • the formation in the immediate vicinity of the borehole is usually perturbed by the drilling process, and more specifically by drilling fluid that invades the formation in the near borehole region.
  • particulates from the drilling fluid tend to buildup on the borehole wall. This buildup is commonly referred to as mudcake, and adversely affects the response of the system. In this way, intervening material between the tool and the borehole wall will adversely affect the tool response.
  • Intervening material in the tool itself between the active elements of the tool and the outer radial surface of the tool will again adversely affect the tool response by producing a background of scattered radiation which is independent of the presence of the borehole fluid, the mudcake or the formation.
  • Typical sources are isotropic in that radiation is emitted with essentially radial symmetry. Flux per unit area decreases as the inverse square of the distance to the source. Radiation per unit area scattered by the formation and back into detectors within the tool also decreases with increasing distance, but not necessarily as the inverse square of the distance. In order to maximize the statistical precision of the measurement, it is desirable to dispose the source and the detector as near as practical to the borehole environs, while still maintaining adequate shielding and collimation.
  • Prior art logging-while-drilling systems use a variety of source and detector geometries to minimize standoff, such as placing a gamma ray source and one or more gamma ray detectors outside the tool body within a drill collar with a stabilizer disposed between source and detectors and the borehole and formation; or within stabilizer fins that radiate outward from a drill collar.
  • This tends to minimize intervening material within the tool, and positions source and detectors near the borehole environs, but often at the expense of decreasing the efficiency of shielding and collimation.
  • the signal-to-noise ratio is often degraded by the detection of particles that have not probed the earth formation but instead have traveled trough low-density regions or voids existing in the tool between source and detectors, and especially through collar and stabilizer.
  • the present invention discloses a logging tool like in claim 1.
  • the tool further comprises a stabilizer located at the periphery around the outer collar surface, wherein this stabilizer comprises a stabilizer wall defined by an inner stabilizer surface and an outer stabilizer surface, and wherein the radiation shield is located between this inner collar surface and this outer stabilizer surface.
  • the stabilizer enhances the contact between the tool and the formation by reducing the space available for mud between the tool and the formation.
  • the tool is designed so that the source and the detector are as near as practical to the borehole environs.
  • the radiation shields increase the signal to noise ratio.
  • the invention below proposes a robust, secure and functional configuration.
  • the radiation shield has a thickness in the cross section perpendicular to the major axis, which is preferably less than 40% of the width of the tool at the position of the radiation source. This makes it possible to eliminate a significant fraction of the radiation that are coming from source and that have not passed through the borehole fluid and the formation, but whose path was entirely inside the collar and the stabilizer.
  • the radiation shield has an annular shape surrounding the detector window and has a length along the axis, which is less than 40% of the distance between the source and the detector. In a preferred embodiment, the radiation shield has a thickness in the cross section perpendicular to the major axis, which is less than 40% of the width of the tool at the position of emitting radiation source. This enables eliminating a part of the radiations passing through the collar to the detecting window and not through the window in the collar to the detector window.
  • this invention is directed toward a radiation density measurement system in underground formations surrounding a borehole with a chemical radioactive source or an electronic radiation source emitting x-ray; or a chemical or electronic neutron source.
  • this invention is directed toward a gamma-ray logging-while-drilling density tool.
  • the system comprises a source of gamma radiation and one or more gamma ray detectors. Multiple detectors (2 or more) provide better efficiency and allow compensation for the effect of mud and mudcake intervening between the tool and the formation. It is clear, however, that the basic concepts of the invention could be employed in other types and classes of logging, logging-while-drilling or measurement-while-drilling systems.
  • the invention can be used in a neutron porosity system for measuring formation porosity, wherein the sensor comprises a neutron source and one or more neutron detectors.
  • the gamma-ray radiation shield is fabricated from a high atomic number material, commonly referred to as "high Z" material.
  • High Z material is an efficient attenuator of gamma-ray radiation, and permits the efficient shielding, collimation and optimum disposition of the source and detectors with respect to the borehole environs.
  • the present invention also discloses a method for logging a well utilizing a tool as mentioned above.
  • Figure 1 illustrates a logging-while-drilling tool, identified as a whole by the numeral 20, disposed by means of a drill string within a well borehole 18 defined by a borehole wall 14 and penetrating an earth formation 16.
  • the upper end of the collar element 22 of the tool 20 is operationally attached to the lower end of a string of drill pipe 28.
  • the stabilizer element of the tool 20 is identified by the numeral 24.
  • a drill bit 26 terminates the lower end of logging tool 20. It should be understood, however, that other elements can be disposed on either end of the tool 20 between the drill pipe 28 and the drill bit 26.
  • the upper end of the drill pipe 28 terminates at a rotary drilling rig 10 at the surface of the earth 12.
  • Drilling mud is circulated down the drill pipe 28, through the axial passage in the collar 22, and exits at the drill bit 26 for return to the surface 12 via the annulus defined by the outer surface of the drill string and the borehole wall 14.
  • Figures 2a, 2b and 2c illustrate conceptually radiation shields on the tool 20 of figure 1 shown in side view on the major axis of the tool.
  • the tool is a logging-while-drilling gamma-ray scattering tool with a chemical radioactive source.
  • the tool 20 is made of an elongated tool body 21 and a drill collar 22 disposed peripherally around the tool body 21.
  • a stabilizer 24 is disposed peripherally around the drill collar 22; the stabilizer is optional and reduces the amount of mud between the tool and the formation wall and therefore the influence of the borehole fluid on the measurement.
  • the tool 20 receives one source collimation window 202 through which the earth formation 16 is illuminated by the radiation emitted from the radioactive source, and two detector collimation windows 212 and 222 through which the radiation coming from the outside of the tool 20 is detected.
  • a source of gamma radiation 201 illuminating the earth formation 16 and affixed to a source holder 200, is mounted in the collar wall 22. Though this is the preferred way, other locations for the source 201 are in the tool body 21 or in the stabilizer 24.
  • the source 201 is preferably cesium-137 ( 137 Cs) which emits gamma radiation with an energy of 0.66 million electron volts (MeV).
  • cobalt-60 60 Co
  • the tool 20 receives a first or "short spaced" gamma ray detector 211 disposed at a first axial distance from the source 201, and a second or “long spaced” gamma ray detector 212 disposed at a second axial distance from the source, where the second spacing is greater than the first spacing.
  • the detectors are mounted in the tool body 21 in holders: 210 for the first detector and 220 for the second detector. Though this is the preferred way, other locations for the detectors 211, 221 are in the collar wall 22 or in the stabilizer 24.
  • the detectors are preferably scintillation type such as sodium iodide (NaI) or Gadolinium-oxy-ortho-silicate (GSO) to maximize detector efficiency for a given detector size.
  • FIG. 2a a side view of the tool illustrates a radiation shield 30 located in the collar 22 whose shape is optimized to reduce leakage through the collar without affecting its mechanical strength.
  • the trajectories of gamma rays traveling from the source to the detector are like broken lines, on which each break corresponds to a collision with an electron within the surrounding material.
  • Gamma radiations lose energy by means of the most pertinent reaction here: Compton scatter reaction. After undergoing one or more Compton scattering events, a small fraction of the emitted with reduced gamma-ray energy returns to the tool and is detected by the gamma radiation detector.
  • the function of the radiation shield 30 is to intercept and attenuate by photoelectric absorption or by Compton scattering and subsequent photoelectric absorption, a significant fraction of those gamma rays that travel through the collar or/and stabilizer and that might otherwise go back to the detector after being scattered in the collar or/and stabilizer.
  • Figure 2b illustrates a side view of the tool with a radiation shield 31 located on the inner collar surface in the collimation window 212 of the first detector 211.
  • the function of the radiation shield 31 is to intercept and attenuate gamma rays traversing the collar to the detecting window.
  • Figure 2c illustrates a side view of the tool with both radiation shields 30 and 31.
  • a Monte-Carlo N-Particle model is built based on the tool plan of figures 2. A compromise is found between the effective shielding and the mechanical strength of the tool.
  • the model of source used is a mono-energetic 0.662 million electron volts (MeV) cesium-137 radiation. Pulse-height spectra for energies between 0.1 and 0.5 MeV for the first NaI detector are computed for three different configurations: (1) tool without extra radiation shield, (2) tool with radiation shield 30 as in figure 2a, (3) tool with radiation shields 30 and 31 as in figure 2c.
  • High Z materials are efficient attenuators of gamma radiation, and permit the efficient shielding, collimation and optimum disposition of the source and detectors with respect to the borehole environs.
  • the radiation shield 30 of figure 2a is in a preferred embodiment, placed into a cavity in the outer surface of the collar, wrapped in a rubber envelope and then compressed underneath a cover plate screwed onto the collar between the source and the detector.
  • better efficiency is obtained when length along the axis of this radiation shield is less than 80% of the first axial distance between source and detector; and when thickness of this radiation shield in the cross section perpendicular to the major axis is less than 40% of the width of the tool at the position of the source.
  • best efficiency is obtained when length along the axis of this radiation shield is less than 60% of the first axial distance between source and detector; and when thickness of this radiation shield in the cross section perpendicular to the major axis is less than 20% of the width of the tool at the position of the source.
  • the radiation shield is disposed circumferentially around the collar outer surface, and preferably covering less than 180° of this surface.
  • the effectiveness of the radiation shield 30 is maximized when its edge is brought closer to that of the collimation window of the first detector. The effectiveness is also increased when the thickness of the radiation shield is increased or an extension towards the source is made, but at the expense of a lower mechanical strength.
  • the length along the axis is 58 mm whereas the first axial distance is 170 mm, and the thickness is 7 mm, and for the circular part, the internal radius is 78 mm and the opening angle is 90°.
  • the radiation shield 30 of figure 2a can be associated with another radiation shield 31 of figure 2b, located at the base and very close to the collimator window of the first detector, this radiation shield 31 has an annular shape surrounding this collimator window and with a trapezoidal section. Both radiation shields in this embodiment are illustrated on figure 2c. The efficiency is maximized with specific angular aperture of the trapezoidal section just as the dimension of the annular shield. Nevertheless, these dimensions of the annular shield are dictated by the requirements for mechanical strength.
  • better efficiency for the radiation shield 31 is obtained when this radiation shield is located between the first detector and the outer stabilizer surface facing the first detector, and when this radiation shield has an annular shape with a length along the axis or a diameter, which is less than 40% of the distance between source and first detector.
  • best efficiency for the radiation shield 31 is obtained when this radiation shield has an annular shape with a length along the axis or a diameter, which is less than 20% of the distance between source and first detector.
  • this radiation shield has a thickness in the cross section perpendicular to the major axis, which is less than 40% of the width of the logging-while-drilling tool at the position of emitting radiation source.
  • this radiation shield has a thickness in the cross section perpendicular to the major axis, which is less than 20% of the width of the logging-while-drilling tool at the position of emitting radiation source.
  • Figure 3 shows the pulse-height spectra obtained by numerical modeling of the tool with optimized radiation shields 30 and 31 for the three configurations already described above.
  • the earth formation is assumed to be very dense like tungsten (17.4 g/cm 3 ) so that practically no gamma-rays will return from the formation and the signal is entirely due to gamma-rays traveling through the collar and the stabilizer.
  • the percentage of total gamma-ray leakage removed from the total signal by the radiation shields is evaluated. For a stabilizer diameter of 81 ⁇ 4 inches, the percentage of gamma-ray leakage removed is of 45% with the radiation shield 30 alone and of 54% with both radiation shields 30 and 31; for a stabilizer diameter of 9 3/8 inches, this percentage is 43% and 51% respectively.
  • the earth formation is assumed to be made of an aluminum alloy (2.805 g/cm 3 ) so gamma-rays will return in this model also from the formation.
  • the percentage of gamma-ray leakage removed from the signal by the radiation shields is evaluated in this model as well and the results are comparable to those obtained with the first model.
  • the percentage of gamma-ray leakage removed is 43% with the radiation shield 30 alone and of 57% with both radiation shields 30 and 31; for a stabilizer diameter of 9 3/8 inches, this percentage is 38% and 46% respectively.
  • the radiation shield 30 removes almost 50% of gamma-ray leakage and the radiation shield 31 removes an additional 10% of gamma-ray leakage.
  • the tool 20 is a logging-while-drilling density tool with an electronic radiation source.
  • the source 201 is an x-rays generator.
  • the shielding materials need to be inserted into the structural materials of the tool body, collar or stabilizer with the intent to optimize shielding with a minimal impact on the structural strength of the tool. Shielding materials for lower energy gamma-rays or x-rays could be lighter materials.
  • the tool 20 is a logging-while-drilling neutron scattering tool with a chemical or electronic neutron source.
  • the source 201 is a chemical source, as Radium-Beryllium source or an electronic source like pulsed neutron generator.
  • the shielding materials need to be inserted into the structural materials of the tool body, collar or stabilizer with the intent to optimize shielding with a minimal impact on the structural strength of the tool. Shielding materials for neutrons will typically be hydrogenous materials and/or neutron absorbing materials, like boron or cadmium for slow neutrons; and will typically be high atomic number materials like tungsten and/or hydrogenous materials for fast neutrons.

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  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Geophysics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Measurement Of Radiation (AREA)

Claims (11)

  1. Instrument de diagraphie (20) pour formations souterraines entourant un trou de forage (14), comprenant :
    - un corps allongé (21) le long d'un axe principal ;
    - une bague (22) disposée à la périphérie dudit corps (21), comportant une paroi de bague définie par une surface intérieure et une surface extérieure ;
    - une source d'émission de rayonnement (201) agencée pour illuminer une formation terrestre (16) entourant le trou de forage ;
    - au moins un détecteur de rayonnement (211) agencé pour détecter le rayonnement réfléchi par la formation terrestre résultant de l'illumination par la source (201) ;
    - au moins une fenêtre de collimation de source (202) et une fenêtre de collimation de détecteur (212) à travers lesquelles la formation terrestre est illuminée et le rayonnement est détecté ; et
    - au moins un blindage de protection contre le rayonnement entre ladite surface de bague intérieure et la surface extérieure de l'instrument, ledit blindage de protection contre le rayonnement étant positionné de façon à supprimer le rayonnement parasite qui n'a pas traversé la surface extérieure, caractérisé en ce qu'un blindage de protection contre le rayonnement (30) est situé entre ladite source d'émission de rayonnement (201) et ledit détecteur de rayonnement (211) et ledit blindage de protection contre le rayonnement présente une longueur le long de l'axe principal qui représente moins de 80% de la distance entre ladite source d'émission de rayonnement (201) et ledit détecteur de rayonnement (211).
  2. Instrument selon la revendication 1, comprenant en outre un stabilisateur (24) situé à la périphérie de la surface de bague extérieure, ledit stabilisateur comprenant une paroi de stabilisateur définie par une surface de stabilisateur intérieure et une surface de stabilisateur extérieure, et le blindage de protection contre le rayonnement étant situé entre ladite surface de bague intérieure et ladite surface de stabilisateur extérieure.
  3. Instrument selon la revendication 1 ou 2, un autre blindage de protection contre le rayonnement (31) présentant une forme annulaire entourant la fenêtre de collimation de détecteur (212) et présentant de préférence une longueur le long de l'axe principal qui représente moins de 40 % de la distance entre ladite source et ledit détecteur.
  4. Instrument selon la revendication 3, ledit blindage de protection contre le rayonnement présentant une épaisseur en section transversale perpendiculaire à l'axe principal qui représente moins de 40 % de la largeur dudit instrument de diagraphie à la position de ladite source d'émission de rayonnement (201).
  5. Instrument selon l'une quelconque des revendications précédentes, la source d'émission de rayonnement étant choisie dans le groupe comprenant : une source radioactive chimique, une source de rayonnement électronique émettant des rayons X, une source de neutrons chimique et une source de neutrons électronique.
  6. Instrument selon la revendication 1, sous la forme d'un instrument de mesure de la densité de diffusion des rayons gamma :
    - ladite source d'émission de rayonnement (201) étant une source de rayons gamma ou une source de rayons X ;
    - un premier détecteur de rayonnement (211) étant un détecteur de rayons gamma à faible espacement, espacé axialement d'une première distance de ladite source d'émission de rayonnement ; et
    - un deuxième détecteur de rayonnement (221) étant un détecteur de rayons gamma à grand espacement, espacé axialement d'une deuxième distance, supérieure à ladite première distance, de ladite source d'émission de rayonnement.
  7. Instrument selon la revendication 1, sous la forme d'un instrument de mesure de la porosité neutron :
    - ladite source d'émission de rayonnement étant une source de neutrons ;
    - ledit détecteur de rayonnement étant un détecteur de neutrons espacé axialement d'une première distance de ladite source de neutrons.
  8. Instrument selon l'une quelconque des revendications précédentes, ledit blindage de protection contre le rayonnement étant constitué d'un matériau à numéro atomique élevé.
  9. Instrument selon la revendication 7, le matériau à numéro atomique élevé comportant du tungstène, de l'uranium appauvri, de l'or ou un alliage de ceux-ci.
  10. Instrument selon l'une quelconque des revendications 1 à 7, ledit blindage de protection contre le rayonnement étant constitué de composants choisis dans le groupe comprenant : des matériaux hydrogénés, des matériaux absorbant les neutrons, du bore et du cadmium.
  11. Procédé de diagraphie d'un puits utilisant l'instrument (20) selon la revendication 1.
EP04291261A 2000-04-07 2004-05-17 Instrument de diagraphie de puits avec blindage de protection contre les rayonnements et procédé de mesure Expired - Lifetime EP1605281B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE602004001045T DE602004001045T2 (de) 2004-05-17 2004-05-17 Bohrlochmessgerät mit Strahlenschutzabschirmung und Messverfahren
EP04291261A EP1605281B1 (fr) 2004-05-17 2004-05-17 Instrument de diagraphie de puits avec blindage de protection contre les rayonnements et procédé de mesure
AT04291261T ATE328294T1 (de) 2004-05-17 2004-05-17 Bohrlochmessgerät mit strahlenschutzabschirmung und messverfahren
CA2506133A CA2506133C (fr) 2004-05-17 2005-05-02 Outil et methode de diagraphie avec ecran de protection radiologique
GB0509221A GB2414296A (en) 2004-05-17 2005-05-06 A well logging tool which has a radiation shield located between its body outer surface and its collar inner surface
US11/127,570 US7285772B2 (en) 2000-04-07 2005-05-12 Logging tool with a parasitic radiation shield and method of logging with such a tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04291261A EP1605281B1 (fr) 2004-05-17 2004-05-17 Instrument de diagraphie de puits avec blindage de protection contre les rayonnements et procédé de mesure

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Publication Number Publication Date
EP1605281A1 EP1605281A1 (fr) 2005-12-14
EP1605281B1 true EP1605281B1 (fr) 2006-05-31

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EP (1) EP1605281B1 (fr)
AT (1) ATE328294T1 (fr)
CA (1) CA2506133C (fr)
DE (1) DE602004001045T2 (fr)
GB (1) GB2414296A (fr)

Cited By (6)

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US8211247B2 (en) 2006-02-09 2012-07-03 Schlumberger Technology Corporation Degradable compositions, apparatus comprising same, and method of use
US8220554B2 (en) 2006-02-09 2012-07-17 Schlumberger Technology Corporation Degradable whipstock apparatus and method of use
US8231947B2 (en) 2005-11-16 2012-07-31 Schlumberger Technology Corporation Oilfield elements having controlled solubility and methods of use
US8567494B2 (en) 2005-08-31 2013-10-29 Schlumberger Technology Corporation Well operating elements comprising a soluble component and methods of use
US9789544B2 (en) 2006-02-09 2017-10-17 Schlumberger Technology Corporation Methods of manufacturing oilfield degradable alloys and related products
US10316616B2 (en) 2004-05-28 2019-06-11 Schlumberger Technology Corporation Dissolvable bridge plug

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US8211248B2 (en) 2009-02-16 2012-07-03 Schlumberger Technology Corporation Aged-hardenable aluminum alloy with environmental degradability, methods of use and making
CN101598017B (zh) * 2008-06-04 2012-10-31 中国石油集团钻井工程技术研究院 方位中子孔隙度随钻测量装置

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10316616B2 (en) 2004-05-28 2019-06-11 Schlumberger Technology Corporation Dissolvable bridge plug
US8567494B2 (en) 2005-08-31 2013-10-29 Schlumberger Technology Corporation Well operating elements comprising a soluble component and methods of use
US8231947B2 (en) 2005-11-16 2012-07-31 Schlumberger Technology Corporation Oilfield elements having controlled solubility and methods of use
US8211247B2 (en) 2006-02-09 2012-07-03 Schlumberger Technology Corporation Degradable compositions, apparatus comprising same, and method of use
US8220554B2 (en) 2006-02-09 2012-07-17 Schlumberger Technology Corporation Degradable whipstock apparatus and method of use
US8663401B2 (en) 2006-02-09 2014-03-04 Schlumberger Technology Corporation Degradable compositions, apparatus comprising same, and methods of use
US9789544B2 (en) 2006-02-09 2017-10-17 Schlumberger Technology Corporation Methods of manufacturing oilfield degradable alloys and related products

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ATE328294T1 (de) 2006-06-15
CA2506133A1 (fr) 2005-11-17
GB2414296A (en) 2005-11-23
EP1605281A1 (fr) 2005-12-14
CA2506133C (fr) 2013-11-26
DE602004001045T2 (de) 2006-12-28
GB0509221D0 (en) 2005-06-15
DE602004001045D1 (de) 2006-07-06

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