WO2009023437A2 - Ruggedized neutron shields - Google Patents
Ruggedized neutron shields Download PDFInfo
- Publication number
- WO2009023437A2 WO2009023437A2 PCT/US2008/071552 US2008071552W WO2009023437A2 WO 2009023437 A2 WO2009023437 A2 WO 2009023437A2 US 2008071552 W US2008071552 W US 2008071552W WO 2009023437 A2 WO2009023437 A2 WO 2009023437A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shield
- tool
- disposed
- fiber
- matrix
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
-
- 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
Definitions
- This invention relates generally to apparatus for shielding against radiation and in particular to radiation shields for subsurface applications.
- the characteristics of subsurface geological formations are of significant interest in the exploration for, production and monitoring of subsurface water, oil and gas.
- a variety of techniques have been developed to measure subsurface formation characteristics and evaluate the characteristics to determine petrophysical properties of interest such as fractional volume of pore space ("porosity"), the mineral composition of the subsurface formations and the fractional amount of such pore spaces that is occupied by particular connate fluids, such as oil, gas and water.
- These techniques typically include the subsurface deployment of tools or instruments equipped with sources adapted to emit energy into the formations (such deployment usually being through a borehole traversing the formations). The emitted energy interacts with the surrounding formations to produce various phenomena that are detected and measured by one or more sensors on the instrument. By processing the detected signal data, a profile or "log" of the subsurface formation characteristics is obtained.
- a variety of measurement (“well logging") techniques have been developed to evaluate subsurface formations some of which include emitting neutrons into the formations and evaluating the results of neutron interactions with formation nuclei.
- Neutrons have no electric charge and their mass is similar to that of a proton. Their mass in particular makes neutrons suitable for subsurface logging applications in which hydrogen-bearing fluids are present in the subsurface formations.
- neutrons interact with hydrogen nuclei in the formations by losing energy and they react with other matter in the formations in a variety of ways. The characteristics of some of these interactions can be used to determine the formation properties.
- Various types of radiation sources have been used in subsurface logging systems.
- neutrons or gamma rays may be generated simply through the use of radioactive isotopes (which naturally decay over time), an x-ray source may be used or neutrons may be generated in a device utilizing a nuclear reaction to generate neutrons on demand.
- U.S. Pat. Nos. 3,255,353, 4,596,926, 4,698,501, 4,705,944, 4,810,459, 4,829,176, 4,879,463, 4,904,865, and 5,012,091 describe logging instruments equipped with active radiation sources and appropriate sensors. For neutron logging, isotope sources have the advantage of being virtually indestructible.
- Isotope sources have no electronic parts, and so can be relied upon to always produce neutrons (zero downtime). However, this is also a disadvantage of the isotopic source. Because the emission of neutrons cannot be controlled, strict radioactive safety procedures must be followed when handling such sources, and the logging instrument containing the source after the source is installed therein. This disadvantage prompted the development of electronic neutron sources.
- High-energy neutrons may be generated through the controlled collision of energized particles by using a nuclear fusion reaction in the above described sources.
- a nuclear fusion reaction in the above described sources.
- Such a system is commonly referred to as a neutron generator.
- the generation of neutrons on demand by the use of energetic particle beams allows the construction of a neutron source which emits neutrons in bursts of well-determined duration and time sequences.
- One such pulsed neutron generator is described in U.S. Pat. No. 3,461,291.
- the neutron generator described in the '291 patent uses an accelerator tube in which charged particles, such as deuterium ions, are accelerated through an electric-static potential and collide with a target element such as tritium.
- the borehole and surrounding formation are irradiated with neutrons, and the various interactions of the neutrons with constituent nuclei are measured.
- the logging instruments are equipped with one or more sensors or detectors that record numbers of neutrons, particularly epithermal energy and thermal energy, as well as gamma rays which are emitted as a result of the interaction of the neutrons with the subsurface formations and the fluids in the borehole itself.
- the gamma rays may include inelastic gamma rays which are a consequence of high-energy collisions of the neutrons with atomic nuclei in the earth formations, as well as capture gamma rays emitted when low energy (thermal) neutrons are captured by susceptible atomic nuclei in the formations.
- Various gamma ray logging techniques and tools are described, for example, in U.S. Patent Nos. 4,390,783, 4,507,554, 5,021,653, 5,081,351, 5,097,123, 5,237,594 and 5,521,378.
- Properties of the formations which may be determined as a result of measuring neutron and gamma ray phenomena include formation density, fractional volume of void or pore space in the formation (porosity), carbon/oxygen (C/O) ratios, formation lithology, and neutron capture cross section (Sigma), among other measurements.
- Properties which may be determined by spectral analysis of the gamma rays include concentrations of various chemical elements, for example.
- Properties of fluids in the wellbore may also be determined from various neutron and gamma ray measurements.
- Nuclear measurements are also applied in nuclear spectroscopy techniques to obtain qualitative and quantitative information related to subsurface fluid movement.
- U.S. Patent No. 5,219,518 describes an instrument equipped with a neutron source and sensors adapted to measure water flow through nuclear oxygen activation.
- Alternative techniques for subsurface fluid measurements include the use of radioactive markers or tracers to identify flow path between formations or wells.
- U.S. Patent Nos. 5,049,743, 5,182,051, 5,243,190, and 5,929,437 describe the use of elements that can be made radioactive by bombardment with neutrons so their location can be determined by nuclear logging.
- Logging tools equipped with gamma ray detectors are particularly suited to distinguish and determine the location of trace materials.
- the nuclear phenomena detected with these instruments are representative of interactions not only with the formation nuclei, but also with the instrument and the borehole.
- the fast neutrons In order to penetrate the formation, the fast neutrons must pass through the tool housing, the fluid in the borehole and casing in some applications before entering the formation.
- the resulting non-formation contributions to the measured radiations significantly complicate the analysis of the formation characteristics.
- the problem is all the more complex since the sensitivity of the detector(s) to the radiations coming from the borehole, instrument and the formation, is a function of many parameters, such as, to name a few, lithology, porosity, tool position in the borehole, borehole size, casing size/weight/eccentricity, cement quality, detector housings, or borehole fluid composition.
- neutron shielding provides a means to moderate interactions of neutrons and components of both the tool itself and the immediately surrounding environment.
- detecting gamma rays emitted from neutron interactions is particularly difficult due to the presence of the housing used to protect the gamma ray detector inside from pressure and abrasion.
- Neutrons interact with these housings to emit gamma rays which can be in the energy range of interest of neutrons interacting with the formations.
- Conventional techniques to shield against such neutron interaction include the use of shields disposed on the instrument.
- U.S. Pat. Nos. 3,947,683, 4,492,864, 4,220,851, 4,020,342, 4,390,783, 4,661,701, 5,081,351 and 7,148,471 describe the use of radiation shielding in well logging tools.
- Neutron shielding known in the art typically includes homogeneous materials consisting of a rubber matrix with neutron absorbing (e.g., boron- 10 containing) particle fillers.
- the filler particles are selected so as to absorb neutrons and emit capture gamma rays that are outside the energy range of gamma rays of interest resulting from neutron interaction with the formations.
- the rubber matrix holds the boron- 10 containing particles together providing structural support.
- the amount (volume or mass) of such particle fillers in a homogenous shielding material is limited by the structural requirements of the shield to resist the borehole environment and to resist abrasion and mechanical damage. A need remains for improved radiation shielding structures for well logging tools.
- a shield for a well logging instrument includes an outer layer including a reinforcing fiber disposed in a matrix and an inner layer including a thermal neutron absorbing material disposed in a matrix.
- the thermal neutron absorbing material is selected to emit capture gamma rays having energy outside a selected energy range.
- a well logging tool includes a tool mandrel configured to be moved along an interior of a wellbore drilled through subsurface formations. At least one radiation detector is disposed in an interior chamber defined by the tool mandrel. A radiation shield is disposed on an exterior surface of the tool mandrel proximate a position therein of the radiation detector. The shield includes an outer layer including a reinforcing fiber disposed in a matrix and an inner layer including a thermal neutron absorbing material disposed in a matrix. The thermal neutron absorbing material is selected to emit capture gamma rays having energy outside a selected energy range.
- FIG. 1 is a schematic of an example shield mounted on a tool mandrel in accordance with the invention
- FIG. 2 is an expanded cross-section of a shield matrix in accordance with the invention
- FIG. 3 is a cut-away perspective of an example shield in accordance with the invention
- FIG. 4 is an end view of shield segments disposed on a tool mandrel in accordance with aspects of the invention.
- FIG. 5 is a schematic of a downhole tool equipped with shields in accordance with various aspects of the invention.
- the present invention includes improved radiation shield configurations providing desired radiation shielding and/or absorption properties while maintaining physical integrity in borehole environments.
- a shield according to the invention may include layered shield material structures. With layered structures, a shield according to the invention can address the problems of proper shielding and maintaining mechanical integrity in downhole environments by including one or more outer layers for exposure to the borehole environment and one or more inner layers providing the desired shielding. The outer layers may be designed to withstand the borehole environment while protecting the one or more inner layers designed to shield neutrons from entering the tool. Some examples are also implemented with one or more structural layers in between the inner and outer layers, which can help to maintain integrity of the shield structure as a whole.
- FIG. 1 shows a cross-sectional view of an example radiation shield 30 according to the invention.
- the radiation shield 30 is disposed on the exterior of an instrument housing or mandrel 45 near the position of a radiation detector 44 (e.g., a gamma ray detector).
- the mandrel may be made from stainless steel, titanium or other material known in the art for defining a pressure sealed, enclosed space therein.
- the detector 44 may be mounted within a sealed housing 46 to exclude air therefrom, and can be disposed in an interior space inside the mandrel 45. Wiring and electronic components coupled to the detector 44 also disposed inside the mandrel 45 are omitted for clarity of the illustration.
- the radiation shield 30 may be configured substantially as an annular cylinder having an inner layer 42 and an outer layer 40 for layering/interspersion of certain materials, as will be further explained below.
- the radiation shield 30 is configured to absorb or capture thermal neutrons impinging thereon, thus substantially preventing thermal neutrons from reaching the mandrel 45.
- the thermal neutrons are prevented from interacting with the mandrel 45 thereby to emit gamma rays.
- the detector 44 is not exposed to gamma rays resulting from interaction of such neutrons with the materials used to make the mandrel 45 and the detector housing 46, as well as other materials inside the mandrel 45.
- FIG. 2 shows a cross-sectional expanded view of one side of the shield 30.
- An outer layering 48 may be formed of any suitable material that provides abrasion/wear resistance, does not produce gamma-rays from neutron interaction therewith in the energy range of interest with respect to formations outside a borehole, and can withstand the ambient environment in a typical borehole. Such environment can include temperatures in excess of 200 degrees C, hydrostatic pressure in excess of 1,500 bar and corrosive and/or reactive agents in a fluid typically disposed in the borehole.
- Suitable materials for the outer layer may include, but are not limited to, decompression-explosion resistant rubber such as nitrile rubber, polyether ketone (PEK) glass fiber, carbon fiber, a fiber sold under the trademark KEVLAR which is a registered trademark of E.I. DuPont de Nemours & Co., fglass fiber-reinforced epoxy resin, graphite or carbon fiber, thermal plastics such as PEKTM, polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and a plastic sold under the trademark ULTRAPEK which is a trademark of BASF, AG, Ludwigshafen, Germany, and composites of such materials.
- decompression-explosion resistant rubber such as nitrile rubber, polyether ketone (PEK) glass fiber, carbon fiber, a fiber sold under the trademark KEVLAR which is a registered trademark of E.I. DuPont de Nemours & Co.
- fglass fiber-reinforced epoxy resin graphite or carbon fiber
- the top or outer layering 48 is formed of a "pre-preg" (a previously manufactured fiber disposed in a plastic resin) consisting of carbon fiber embedded in PEEK.
- the outer layer 48 may be formed as a layered sheet or sheets and may include fiber fillers.
- the outer layer 48 includes glass fiber or carbon fiber, or combinations thereof disposed in a resin matrix such as PEEK.
- a purpose for such structure is to provide sufficient mechanical strength and abrasion resistance to the outer layer, while minimizing the amount of hydrogen-containing material in the matrix.
- Such structure may minimize the thermalization of neutrons entering the outer layer from a source (see FIG. 5) and from the surrounding formations.
- An inner or bottom layer 50 includes materials that provide the radiation shield 30 with substantial thermal neuron capture cross-section, and do not emit capture gamma rays that have energy in an energy range of interest intended to be detected from the formations by the radiation detector (44 in FIG. 1).
- the inner layer 50 can be implemented for example, by depositing crystalline boron- 10 can be onto a filament, such as carbon or glass fiber, and embedding the boron- 10 covered filament in an epoxy matrix, for example, PEEK.
- the combined structure of filament embedded in resin matrix can be premanufactured in sheets creating what is known as "pre-preg.” Such pre- preg can be wound around the exterior of the mandrel (45 as shown in FIG.
- the outer layer 48 can then be applied over the inner layer 50 to produce the completed shield 30.
- the outer layer 48 may also include a selected amount of neutron-absorbing materials (e.g., boron- 10 containing particles) dispersed in the resin matrix for additional shielding. Such particles are shown at 39 in FIG. 2.
- Some examples may include a structural layer 53 disposed between the inner layer 50 and the outer layer 48.
- a purpose for the structural layer is to provide mechanical integrity to the overall shield structure, particularly to the inner layer 50.
- the structural layer 53 may be made from PEEK or similar resin, for example.
- a thickness of the structural layer 53 should be limited to avoid excessive thermalization of neutrons.
- FIG. 3 shows another example of a shield 30 according to of the invention.
- a cylindrical body 40 is shown in a cut-away perspective to illustrate the shield matrix 42. Though shown in partial view for clarity of explanation, the body 40 is formed as a single annular cylinder with elongated walls and an inner bore.
- the body 40 is formed using suitable materials as described above.
- a shield 30 can be formed with a body consisting entirely of a composite material having a matrix 42 distribution as disclosed herein.
- the matrix 42 is configured with neutron-absorbing material or particles 51 interspersed therein and an outer layering 48 to provide abrasion resistance and wear resistance.
- FIG. 4 shows an end view of another example shield 30 according to the invention.
- Two arcuate shaped members 35 are shown disposed in juxtaposition on the outer surface of the mandrel 45.
- the arcuate shaped members 35 are shown in end view to illustrate how the members are "arcuate shaped.”.
- arcuate shaped as used herein is intended to mean any subset of a closed cylinder and could also comprise, for example, a sector, quadrant, or semi-cylindrical device or a half cylinder..
- the term “arcuate shaped member” is thus intended to comprise any number of circumferential sections which, when juxtaposed together, would comprise or constitute an annular cylinder.
- a shield according to this example may be formed with multiple arcuate shaped members configured to form a closed cylinder (i.e., a sleeve) having an inner bore and open ends, as shown in FIG. 4.
- Various implementations of the invention can be configured with a matrix 42 having neutron-absorbing material or particles 51 interspersed in a graduated manner such that a greater concentration of the material/particles are encountered deeper (i.e., in a direction away from an outer surface of the shield) in the shield body.
- This example is shown in FIG. 4 with the arcuate shaped member 35 labeled A.
- Various examples of the invention can also be configured with the neutron-absorbing material/particles 51 interspersed to form a more clearly defined layer. This example is shown in FIG. 4 with the arcuate shaped member 35 having a layer labeled B.
- examples can be configured with multiple or alternating distributions of neutron-absorbing material/particles 51 and abrasion resistant layers (as shown by the right-hand arcuate shaped member 35 in FIG. 4).
- Yet other examples can be configured with a distribution of neutron-absorbing material/particles 51 forming a plurality of graduated layers. This aspect is shown in the right-hand arcuate shaped member 35 of FIG. 4.
- FIG. 5 shows a well logging system 70 to acquire subsurface measurement data including a plurality of shields 30 according to the invention.
- the well logging system 70 includes a downhole tool 72 shown disposed in a borehole 74 traversing a subterranean formation.
- the tool 72 might be, for example, of the type described in U.S. Patent Nos. 7,073,378, 5,884,234, 5,067,090 and 5,608,215 (all of which are assigned to the assignee of the present invention).
- the tool 72 includes a radiation source 31 (e.g., a pulsed neutron generator).
- the shields 30 are disposed on the tool 72 body, surrounding radiation detectors 34 (e.g., gamma ray detectors) mounted within housing structures 33 disposed inside the tool body.
- the shields 30 may be disposed on the tool 72 by wrapping layered shielding pre-preg material under tension, by sliding a shield onto the tool body as a pre-formed sleeve structure as shown in FIG. 3, by applying cirdumferetial segments made as shown in FIG. 4 and explained with reference thereto, or by other means known in the art.
- the shields 30 may be held in place using any suitable means known in the art.
- the tool 72 body may include a recessed area or voids to accept the shield(s) 30 (not shown).
- the tool 72 mandrel (45 in FIG. 1) may be formed of metal or non-conductive composites as known in the art. Various examples can also be implemented with the shields 30 forming an integral part of a composite (non-metallic) tool body (not shown). In addition to the radiation source 31 and detectors 34, the tool 72 may be equipped with additional energy sources and sensors to perform a variety of subsurface measurements as known in the art.
- the tool 72 typically includes electronics/hardware 76 with appropriate circuitry for making and communicating or storing measurements made by the various sensors in the tool 72.
- the tool 72 is shown suspended in the borehole 74 by a conveyance device 78, which can be a wireline system (e.g., slickline, armored electrical cable, and/or coiled tubing having electrical cable therein, etc.) or a pipe string in the case of a logging while-drilling system.
- a conveyance device 78 With a wireline conveyance device, the tool 72 is raised and lowered in the borehole 74 by a winch 80, which is controlled by the surface equipment 82.
- the conveyance 78 includes insulated electrical conductors 84 that connect the downhole electronics 76 with the surface equipment 82 for signal/data/power and control communication.
- the power may be supplied downhole, the signals/data may be processed and/or recorded in the tool 72 and the recorded and/or processed data transmitted by various telemetry means to the surface equipment 82.
- the precise forms and details of the signals produced and/or detected with the sources and detectors vary according to the desired measurements and applications as known in the art and are not limitations on the scope of the present invention.
- a shield made as explained herein may be disposed on practically any device where the described radiation shielding properties are desired. Such shields are particularly suitable for subsurface applications.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2010001461A MX2010001461A (en) | 2007-08-10 | 2008-07-30 | Ruggedized neutron shields. |
RU2010108533/28A RU2473100C2 (en) | 2007-08-10 | 2008-07-30 | High-strength neutron shield |
BRPI0814872-4A BRPI0814872A2 (en) | 2007-08-10 | 2008-07-30 | Shielding for a well profiling instrument, and well profiling tool |
US12/672,445 US8895914B2 (en) | 2007-08-10 | 2008-07-30 | Ruggedized neutron shields |
EP08827551A EP2176687A2 (en) | 2007-08-10 | 2008-07-30 | Ruggedized neutron shields |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US95507707P | 2007-08-10 | 2007-08-10 | |
US60/955,077 | 2007-08-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2009023437A2 true WO2009023437A2 (en) | 2009-02-19 |
WO2009023437A3 WO2009023437A3 (en) | 2009-07-09 |
WO2009023437A4 WO2009023437A4 (en) | 2009-08-27 |
Family
ID=40351406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/071552 WO2009023437A2 (en) | 2007-08-10 | 2008-07-30 | Ruggedized neutron shields |
Country Status (6)
Country | Link |
---|---|
US (1) | US8895914B2 (en) |
EP (1) | EP2176687A2 (en) |
BR (1) | BRPI0814872A2 (en) |
MX (1) | MX2010001461A (en) |
RU (1) | RU2473100C2 (en) |
WO (1) | WO2009023437A2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010118120A2 (en) * | 2009-04-07 | 2010-10-14 | Baker Hughes Incorporated | Method for taking gamma-gamma density measurements |
US8440961B2 (en) | 2009-04-07 | 2013-05-14 | Baker Hughes Incorporated | Gamma ray generator |
WO2013096267A1 (en) * | 2011-12-19 | 2013-06-27 | Schlumberger Canada Limited | Neutron detection using a shielded gamma detector |
US9417355B2 (en) | 2013-12-31 | 2016-08-16 | Schlumberger Technology Corporation | Composition-matched inelastic or capture spectroscopy tool |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010088439A2 (en) | 2009-01-30 | 2010-08-05 | Schlumberger Canada Limited | System and method for matching lithology responses of downhole tools having different source energies |
WO2011146734A2 (en) * | 2010-05-19 | 2011-11-24 | Schlumberger Canada Limited | Pulse neutron formation gas identification with lwd measurements |
US20130161564A1 (en) * | 2011-12-22 | 2013-06-27 | International Scientific Technologies, Inc. | NanoStructured Additives to High-Performance Polymers for Use in Radiation Shielding, Protection Against Atomic Oxygen and in Structural Applications |
US8946663B2 (en) * | 2012-05-15 | 2015-02-03 | Spansion Llc | Soft error resistant circuitry |
US20140312906A1 (en) * | 2013-04-23 | 2014-10-23 | Baker Hughes Incorporated | Fractal shaped antenna for downhole logging |
US10537350B2 (en) * | 2017-03-28 | 2020-01-21 | Biosense Webster (Israel) Ltd. | Medical device having a reusable position sensor |
US11456147B2 (en) * | 2017-06-23 | 2022-09-27 | Chrysos Corporation Limited | Shielded X-ray radiation apparatus |
US10948624B1 (en) * | 2019-11-25 | 2021-03-16 | Halliburton Energy Services, Inc. | LWD mineralogy/spectroscopy thermal neutron shielding |
CN113279743B (en) * | 2021-05-25 | 2022-05-31 | 电子科技大学 | Downhole auxiliary measuring device based on flexible composite material |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1131406A (en) * | 1966-04-22 | 1968-10-23 | Texaco Development Corp | Epithermal neutron well logging |
GB1500899A (en) * | 1970-10-22 | 1978-02-15 | Hopp Ing Buero | Neutron shielding for an armoured vehicle |
EP0942147A1 (en) * | 1998-02-19 | 1999-09-15 | Schlumberger Limited | Use of polyaryletherketone-type thermoplastics in downhole tools |
EP1081509A2 (en) * | 1999-08-20 | 2001-03-07 | Saint-Gobain Industrial Ceramics, Inc. | Thermal neutron scintillation detector with background gamma-ray shielding |
Family Cites Families (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3255353A (en) | 1962-12-21 | 1966-06-07 | Serge A Scherbatskoy | Apparatus for nuclear well logging while drilling |
US3461291A (en) | 1967-06-22 | 1969-08-12 | Schlumberger Technology Corp | Well logging device using a pulsed source of monoenergetic neutrons |
US3947683A (en) | 1973-06-05 | 1976-03-30 | Texaco Inc. | Combination of epithermal and inelastic neutron scattering methods to locate coal and oil shale zones |
CA1051125A (en) * | 1975-02-13 | 1979-03-20 | Schlumberger Canada Limited | Neutron borehole logging correction technique |
US4020342A (en) | 1975-12-22 | 1977-04-26 | Texaco Inc. | Earth formation salinity by comparison of inelastic and capture gamma ray spectra |
EP0001879B2 (en) | 1977-09-07 | 1989-11-23 | Imperial Chemical Industries Plc | Thermoplastic aromatic polyetherketones, a method for their preparation and their application as electrical insulants |
US4220851A (en) | 1978-07-03 | 1980-09-02 | Texaco Inc. | Gain stabilization for radioactivity well logging apparatus |
US4522868A (en) * | 1980-02-01 | 1985-06-11 | Toray Industries, Inc. | Neutron-shielding fabric and composite fiber and method of manufacture thereof |
US4390783A (en) | 1980-08-04 | 1983-06-28 | Schlumberger Technology Corporation | Spectroscopic analysis with background compensation |
US4492864A (en) | 1981-07-31 | 1985-01-08 | Texaco Inc. | Neutron well logging |
US4501964A (en) | 1981-08-03 | 1985-02-26 | Texaco Inc. | Borehole compensated oxygen activation nuclear well logging |
US4507554A (en) | 1983-02-07 | 1985-03-26 | Schlumberger Technology Corporation | Method and apparatus for determining borehole and formation constituents |
US4596926A (en) | 1983-03-11 | 1986-06-24 | Nl Industries, Inc. | Formation density logging using multiple detectors and sources |
US4930783A (en) | 1983-10-21 | 1990-06-05 | Antonious A J | Golf club |
US4873488A (en) | 1985-04-03 | 1989-10-10 | Schlumberger Technology Corporation | Induction logging sonde with metallic support having a coaxial insulating sleeve member |
US4698501A (en) | 1985-05-16 | 1987-10-06 | Nl Industries, Inc. | System for simultaneous gamma-gamma formation density logging while drilling |
US4661701A (en) | 1985-07-17 | 1987-04-28 | Schlumberger Technology Corporation | Methods and apparatus for borehole-corrected spectral analysis of earth formations |
US4810459A (en) | 1985-12-10 | 1989-03-07 | Nl Industries, Inc. | Method and apparatus for determining true formation porosity from measurement-while-drilling neutron porosity measurement devices |
US4883956A (en) | 1985-12-23 | 1989-11-28 | Schlumberger Technology Corporation | Methods and apparatus for gamma-ray spectroscopy and like measurements |
US4926044A (en) | 1986-01-31 | 1990-05-15 | Schlumberger Technology Corporation | Thermal decay time logging method and apparatus |
US4829176A (en) | 1986-06-11 | 1989-05-09 | Nl Industries, Inc. | Logging apparatus and method |
US4879463A (en) | 1987-12-14 | 1989-11-07 | Schlumberger Technology Corporation | Method and apparatus for subsurface formation evaluation |
US4904865A (en) | 1988-04-01 | 1990-02-27 | Exploration Logging, Inc. | Externally mounted radioactivity detector for MWD |
US4937446A (en) | 1988-06-07 | 1990-06-26 | Schlumberger Technology Corporation | Carbon/oxygen well logging method and apparatus |
US4972082A (en) | 1989-03-16 | 1990-11-20 | Schlumberger Technology Corporation | Methods and apparatus for epithermal neutron logging |
US5067090A (en) | 1989-05-01 | 1991-11-19 | Schlumberger Technology Corporation | Nuclear spectroscopy method and apparatus for digital pulse height analysis |
US5219518A (en) | 1989-10-02 | 1993-06-15 | Schlumberger Technology Corporation | Nuclear oxygen activation method and apparatus for detecting and quantifying water flow |
US5243190A (en) | 1990-01-17 | 1993-09-07 | Protechnics International, Inc. | Radioactive tracing with particles |
US5182051A (en) | 1990-01-17 | 1993-01-26 | Protechnics International, Inc. | Raioactive tracing with particles |
US5049743A (en) | 1990-01-17 | 1991-09-17 | Protechnics International, Inc. | Surface located isotope tracer injection apparatus |
US5021653A (en) | 1990-02-07 | 1991-06-04 | Schlumberger Technology Corporation | Geochemical logging apparatus and method for determining concentrations of formation elements next to a borehole |
US5097123A (en) | 1990-02-07 | 1992-03-17 | Schlumberger Technology Corporation | Broad energy spectra neutron source for logging and method |
US5012091A (en) | 1990-02-27 | 1991-04-30 | Halliburton Logging Services, Inc. | Production logging tool for measuring fluid densities |
US5237594A (en) | 1990-03-22 | 1993-08-17 | Schlumberger Technology Corporation | Nuclear activation method and apparatus for detecting and quantifying earth elements |
US5081351A (en) | 1990-10-31 | 1992-01-14 | Schlumberger Technology Corporation | Method and apparatus for borehole correction in capture gamma ray spectroscopy measurements |
US5105080A (en) | 1991-04-02 | 1992-04-14 | Schlumberger Technology Corporation | Method and apparatus for determining the respective contributions of borehole and earth formation in gamma ray spectroscopy |
US5235185A (en) | 1992-01-09 | 1993-08-10 | Schlumberger Technology Corporation | Formation sigma measurement from thermal neutron detection |
US5434408A (en) | 1992-05-28 | 1995-07-18 | Halliburton Logging Services, Inc. | Induced gamma ray spectroscopy well logging system |
US5348096A (en) * | 1993-04-29 | 1994-09-20 | Conoco Inc. | Anisotropic composite tubular emplacement |
US6710600B1 (en) * | 1994-08-01 | 2004-03-23 | Baker Hughes Incorporated | Drillpipe structures to accommodate downhole testing |
US5539225A (en) | 1994-09-16 | 1996-07-23 | Schlumberger Technology Corporation | Accelerator-based methods and apparatus for measurement-while-drilling |
US5608215A (en) | 1994-09-16 | 1997-03-04 | Schlumberger Technology Corporation | Method and apparatus for determining density of earth formations |
US5521378A (en) | 1995-02-01 | 1996-05-28 | Schlumberger Technology Corporation | Method and apparatus for gamma ray logging of underground formations |
US5929437A (en) | 1995-08-18 | 1999-07-27 | Protechnics International, Inc. | Encapsulated radioactive tracer |
US5705944A (en) | 1996-06-13 | 1998-01-06 | United Microelectronics Corp. | Method and device for detecting internal resistance voltage drop on a chip |
US5884234A (en) | 1996-08-30 | 1999-03-16 | Schlumberger Technology Corporation | Method for pulse shape regulation and discrimination in a nuclear spectroscopy system |
US6300762B1 (en) | 1998-02-19 | 2001-10-09 | Schlumberger Technology Corporation | Use of polyaryletherketone-type thermoplastics in a production well |
US6577244B1 (en) | 2000-05-22 | 2003-06-10 | Schlumberger Technology Corporation | Method and apparatus for downhole signal communication and measurement through a metal tubular |
US6862970B2 (en) * | 2000-11-21 | 2005-03-08 | M Cubed Technologies, Inc. | Boron carbide composite bodies, and methods for making same |
US7148471B2 (en) | 2001-05-18 | 2006-12-12 | Schlumberger Technology Corporation | Well logging apparatus and method for measuring formation properties |
US7073378B2 (en) | 2003-08-07 | 2006-07-11 | Schlumberger Technology Corporation | Integrated logging tool for borehole |
US7026813B2 (en) | 2003-09-25 | 2006-04-11 | Schlumberger Technology Corporation | Semi-conductive shell for sources and sensors |
US7514930B2 (en) | 2003-12-02 | 2009-04-07 | Schlumberger Technology Corporation | Apparatus and method for addressing borehole eccentricity effects |
RU2258944C1 (en) * | 2004-08-12 | 2005-08-20 | Иванов Александр Викторович | Density gamma-gamma logging device |
US7671597B2 (en) | 2005-06-14 | 2010-03-02 | Schlumberger Technology Corporation | Composite encased tool for subsurface measurements |
-
2008
- 2008-07-30 RU RU2010108533/28A patent/RU2473100C2/en not_active IP Right Cessation
- 2008-07-30 BR BRPI0814872-4A patent/BRPI0814872A2/en not_active IP Right Cessation
- 2008-07-30 WO PCT/US2008/071552 patent/WO2009023437A2/en active Application Filing
- 2008-07-30 MX MX2010001461A patent/MX2010001461A/en active IP Right Grant
- 2008-07-30 US US12/672,445 patent/US8895914B2/en active Active
- 2008-07-30 EP EP08827551A patent/EP2176687A2/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1131406A (en) * | 1966-04-22 | 1968-10-23 | Texaco Development Corp | Epithermal neutron well logging |
GB1500899A (en) * | 1970-10-22 | 1978-02-15 | Hopp Ing Buero | Neutron shielding for an armoured vehicle |
EP0942147A1 (en) * | 1998-02-19 | 1999-09-15 | Schlumberger Limited | Use of polyaryletherketone-type thermoplastics in downhole tools |
EP1081509A2 (en) * | 1999-08-20 | 2001-03-07 | Saint-Gobain Industrial Ceramics, Inc. | Thermal neutron scintillation detector with background gamma-ray shielding |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010118120A2 (en) * | 2009-04-07 | 2010-10-14 | Baker Hughes Incorporated | Method for taking gamma-gamma density measurements |
WO2010118120A3 (en) * | 2009-04-07 | 2011-01-13 | Baker Hughes Incorporated | Method for taking gamma-gamma density measurements |
GB2481158A (en) * | 2009-04-07 | 2011-12-14 | Baker Hughes Inc | Method for taking gamma-gamma density measurements |
US8436294B2 (en) | 2009-04-07 | 2013-05-07 | Baker Hughes Incorporated | Method for taking gamma-gamma density measurements |
US8440961B2 (en) | 2009-04-07 | 2013-05-14 | Baker Hughes Incorporated | Gamma ray generator |
GB2481158B (en) * | 2009-04-07 | 2013-05-29 | Baker Hughes Inc | Method for taking gamma-gamma density measurements |
US9304214B2 (en) | 2010-06-30 | 2016-04-05 | Schlumberger Technology Corporation | Neutron detection using a shielded gamma detector |
WO2013096267A1 (en) * | 2011-12-19 | 2013-06-27 | Schlumberger Canada Limited | Neutron detection using a shielded gamma detector |
US9417355B2 (en) | 2013-12-31 | 2016-08-16 | Schlumberger Technology Corporation | Composition-matched inelastic or capture spectroscopy tool |
Also Published As
Publication number | Publication date |
---|---|
RU2010108533A (en) | 2011-09-20 |
RU2473100C2 (en) | 2013-01-20 |
BRPI0814872A2 (en) | 2015-08-11 |
US20110303836A1 (en) | 2011-12-15 |
US8895914B2 (en) | 2014-11-25 |
WO2009023437A4 (en) | 2009-08-27 |
MX2010001461A (en) | 2010-03-15 |
EP2176687A2 (en) | 2010-04-21 |
WO2009023437A3 (en) | 2009-07-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8895914B2 (en) | Ruggedized neutron shields | |
US10185053B2 (en) | Radiation generator and power supply configuration for well logging instruments | |
US10197701B2 (en) | Logging tool for determination of formation density and methods of use | |
CA2534304C (en) | Integrated logging tool for borehole | |
US8461520B2 (en) | Sourceless gamma ray production system and methods | |
CA2377123C (en) | Subsurface radiation phenomena detection with combined and azimuthally sensitive detectors | |
US6754586B1 (en) | Apparatus and methods for monitoring output from pulsed neutron sources | |
US20070241275A1 (en) | Neutron source for well logging | |
US20090045329A1 (en) | Downhole Tools Having Combined D-D and D-T Neutron Generators | |
US4342911A (en) | Focused nuclear interface survey instrument and method of determining density changes in mining and storage wells | |
WO2001022123A1 (en) | Formation evaluation combination system for petrophysical well log analysis | |
US8440961B2 (en) | Gamma ray generator | |
US8436294B2 (en) | Method for taking gamma-gamma density measurements | |
US20020014583A1 (en) | Dual compensated chlorine logging tool | |
WO2020113333A1 (en) | Density measurement devices and methods | |
US20110024613A1 (en) | Materials for use as structural neutron moderators in well logging tools | |
US4189638A (en) | Water injection profiling by nuclear logging | |
US20110186722A1 (en) | Apparatus and Method for Pulsed Neutron Generation Including a High Voltage Power Supply | |
Arnold | Water injection profiling by nuclear logging | |
Hwang et al. | Radioactive well logging in Korea |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08827551 Country of ref document: EP Kind code of ref document: A2 |
|
WWE | Wipo information: entry into national phase |
Ref document number: MX/A/2010/001461 Country of ref document: MX |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2008827551 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010108533 Country of ref document: RU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12672445 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: PI0814872 Country of ref document: BR Kind code of ref document: A2 Effective date: 20100205 |