WO2009142779A1 - Methods for magnetic imaging of geological structures - Google Patents
Methods for magnetic imaging of geological structures Download PDFInfo
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- WO2009142779A1 WO2009142779A1 PCT/US2009/030526 US2009030526W WO2009142779A1 WO 2009142779 A1 WO2009142779 A1 WO 2009142779A1 US 2009030526 W US2009030526 W US 2009030526W WO 2009142779 A1 WO2009142779 A1 WO 2009142779A1
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- magnetic
- geological structure
- magnetic material
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- geological
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
Definitions
- Hydraulic fracturing is often used to increase reservoir contact and increase production rates.
- proppants are typically added to a fracturing fluid pumped into the geological structure in order to keep the fractures from closing in upon themselves when pressure is released.
- Another technique commonly used in secondary production is displacement flooding, of which water-flooding is the most common.
- displacement flooding a displacing fluid is introduced from an injection well, and oil and/or gas are extracted from a nearby production well. The displacing fluid frees oil or gas not released during primary production and pushes the oil or gas toward the production well.
- Displacing fluids include, for example, air, carbon dioxide, foams, surfactants, and water. Hydraulic fracturing is often applied to injection and production wells in conjunction with displacement flooding operations.
- flooding operations can be measured periodically to monitor flooding progression.
- Neither of the above techniques have the capability to accurately determine the size, structure and location of injected materials such as, for example, injected proppants and water- flood. Improved knowledge concerning the location of injected proppants and water-flood in fractures and natural geological pores would aid production engineers in tailoring production conditions to meet local geological settings. Further, knowledge about the location of injected proppants and fractures would significantly improve safety in production processes by identifying potentially catastrophic events before their occurrence. For example, vertical fractures can rupture the strata sealing geological structures and potentially intersect fresh water aquifers. Detecting a vertical fracture situation would allow production wells to be sealed, thereby preventing petroleum loss and aquifer damage.
- methods for assaying a geological structure include providing a dispersion of magnetic material in a fluid; injecting the dispersion of magnetic material into the geological structure; placing at least one magnetic probe in a proximity to the geological structure; generating a magnetic field in the geological structure with the at least one magnetic probe; and detecting a magnetic signal.
- the methods include: a) providing a dispersion of magnetic material in a fluid; b) injecting the dispersion of magnetic material into the geological structure; c) placing at least one magnetic detector into the geological structure; and d) measuring a resonant frequency in the at least one magnetic detector.
- the resonant frequency is at least partially determined by an amount of the magnetic material injected into geological structure and a location of the magnetic material relative to the at least one magnetic detector.
- transmitter-receive antenna configurations such as dipole-dipole, dipole-loop and loop-loop configurations.
- An illustrative method utilizing such transmitter-receiver antenna configurations includes, for example, travel-time tomography.
- FIGURE 1 presents finite-element modeling of the radiofrequency amplitude response of a 1 Hz dipole placed over a brine-filled rock source (FIGURE IA) and a brine-filled rock source loaded with 50 ⁇ 0 of magnetic material (FIGURE IB);
- FIGURE 2 presents finite-element modeling of the extent of y-axis magnetization in the presence of a simulated 1 mG field generated by a 1 Hz current loop, wherein the magnetic permeability is 1 ⁇ 0 (FIGURE 2A), 5 ⁇ 0 (FIGURE 2B), 50 ⁇ 0 (FIGURE 2C) and 500 ⁇ 0 (FIGURE 2D);
- FIGURE 3 presents a 1:30 scale schematic model of the simulated magnetic flux generated in a geological structure through a magnetic well-bore in the absence of injected magnetic material
- FIGURE 4 presents a 1:30 scale schematic model of the simulated magnetic flux generated in a geological structure through a magnetic well-bore in the presence of 50 ⁇ 0 injected magnetic material
- FIGURE 5 presents finite-element modeling of simulated total magnetization in a horizontal well-bore in the presence of 50 ⁇ 0 injected magnetic material as determined by a resonant frequency magnetic detector with offset (FIGURE 5A) and non-offset (FIGURE 5B) detector configurations.
- COMSOL® refers to a finite-element modeling (FEM) software package available for various physics and engineering applications (http://www.comsol.com). COMSOL® modeling presented herein includes static and time- varying three-dimensional electromagnetic modeling.
- Ferite refers to a ferromagnetic compound formed from iron (III) oxide and another oxide.
- Illustrative ferrites include materials with a general formula AM 2 O 4 , wherein A and M are metal atoms and at least one of A and M is Fe.
- Ferrofluid refers to a liquid that becomes polarized in the presence of a magnetic field.
- a ferrofluid typically includes a paramagnetic, superparamagnetic, ferromagnetic or ferrimagnetic material disposed as a colloidal suspension in a carrier fluid such as, for example, an organic solvent or water.
- the magnetic material disposed in the carrier fluid can be a magnetic nanoparticle.
- Hematite refers to a common mineral form of iron (III) oxide.
- Magneticite refers to a ferrimagnetic mineral having a chemical formula Fe 3 O 4 .
- RLC circuit refers to an electrical circuit including a resistor (R), an inductor (L), and a capacitor (C), connected in series or in parallel.
- Most economically interesting geological structures such as, for example, petroleum reservoirs, have low magnetic permeabilities, essentially equal to that of vacuum, ⁇ 0 .
- the present disclosure describes injecting magnetic materials into geological structures and then detecting the magnetic materials within the geological structures. Detecting the magnetic materials provides a means for imaging the locations of fractures and injected materials within the geological structures. Since the magnetic permeabilities of geological structures are typically very low, any injected magnetic materials will substantially modify detected magnetic flux response compared to that typically seen for native rocks, natural gas, oil, water, and brine of most geological structures. Such magnetic imaging techniques are advantageous over methods currently in use for monitoring petroleum production by allowing high-resolution and repeatable imaging during production processes.
- methods for assaying a geological structure include providing a dispersion of magnetic material in a fluid; injecting the dispersion of magnetic material into the geological structure; placing at least one magnetic probe in a proximity to the geological structure; generating a magnetic field in the geological structure with the at least one magnetic probe; and detecting a magnetic signal.
- the geological structure is penetrated by at least one vertical well. In some embodiments, the geological structure is penetrated by at least one horizontal well.
- the geological structure includes a deposit such as, for example, oil, gas, or combinations thereof.
- Geological structures have been characterized over geologically-relevant dimensions using electromagnetic methods, but these methods have not heretofore utilized injected magnetic materials.
- Electromagnetic methods for characterizing geological structures have typically relied upon the low conductivity and permittivity of petroleum compared to brine, which is usually found concurrently with petroleum in geological structures.
- An illustrative electromagnetic method for characterizing geological structures is controlled-source electromagnetic (CSEM) surveying. In this method, variations in geological structure conductivity are detected via the electrical component of an applied electromagnetic field. Spatial variation in conductivity results in changes in received signal amplitude, thus indicating a possible petroleum-containing geological structure.
- CSEM surveying has typically been used for mapping non-conductive deposits in deep marine environments using electric dipole transmitter and receiver antennas. The thick layer of highly conductive seawater screens the electric dipole receiver antennas from air-path interference.
- FIGURES IA and IB Illustrative finite-element modeling depicting the influence of injected magnetic materials on radiofrequency amplitude response in the presence of a 1 Hz dipole in proximity to a simulated geological structure are shown in FIGURES IA and IB.
- FIGURE IA presents finite-element modeling of radiofrequency amplitude response of a 1 Hz dipole over a brine-filled rock source.
- FIGURE IB presents finite-element modeling of radiofrequency amplitude response of a 1 Hz dipole over the same brine-filled rock source loaded with 50 ⁇ 0 of magnetic material.
- the target measurement zone is located on-shore with dimensions of 4 kilometers long by 200 meters wide and positioned 1000 meters below a rock/air interface within a sphere having a radius of 5 kilometers.
- ⁇ 1.5 S
- FIGURE IB magnetic material in the target measurement zone significantly spreads radiofrequency amplitude response at the air/rock interface.
- FIGURES 2A, 2B, 2C and 2D illustrate finite-element modeling depicting the extent of y-axis magnetization in the presence of a simulated 1 mG field strength generated by a 1 Hz current loop.
- the plane of the current loop is oriented vertically.
- the current loop is 2 meters in diameter and embedded in a target plane of 30% porosity rock filled with brine.
- the target plane is 1000 meters below the surface of a geological formation, above which is air.
- the target plane magnetic permeability is varied through 1, 5, 50 and 500 ⁇ 0 to illustrate the change in observed y-axis magnetization.
- the extent of y-axis magnetization is highly influenced by the amount of magnetic material present. Similar changes in magnetization can be visualized along other axes..
- Magnetic materials of the present disclosure typically are characterized by high magnetic permeabilities at low applied magnetic fields. Low applied magnetic fields typically include, for example, magnetic field strengths less than about 0.1 Tesla. One skilled in the art will recognize, however, that higher magnetic fields may be applied in the methods described herein.
- Magnetic materials include, for example, paramagnetic, superparamagnetic, ferromagnetic and ferrimagnetic materials.
- the magnetic materials are dispersed in a fluid such as, for example, water, brine, drilling mud, fracturing fluid and combinations thereof.
- the fluid includes a proppant such as, for example, sand.
- Magnetic materials can be added to injected proppants and used during fracturing to monitor the extent of the fracturing process. Likewise, magnetic materials can also be used during flooding operations to monitor flood front progression through the geological structure.
- the dispersion of magnetic material comprises a ferrofluid.
- the ferrofluid may include a dispersion of magnetic nanoparticles, which forms the ferrofluid. Ferrofluids may be injected directly into the geological structures or diluted in another fluid for injection in the geological structures.
- the magnetic material comprises magnetic nanoparticles.
- the magnetic material includes, for example, iron, cobalt, iron (III) oxide, magnetite, hematite, ferrites, and combinations thereof.
- an illustrative ferrite has a general chemical formula AM 2 O 4 , where A and M are metal atoms and at least one of A and M is Fe.
- the ferrites are doped with at least one element that is not A or M.
- Ferrofluids generally include magnetic metal or metal oxide particles such as, for example, iron, cobalt, iron (III) oxide, and magnetite.
- ferrofluids are commercially available or are easily synthesized. Most commercially-available ferrofluids are based on magnetite, which provides a low-field permeability of about 100 ⁇ 0 . Higher permeabilities are advantageous for increased detection sensitivities in the embodiments described herein.
- An illustrative high- permeability ferrofluid is formed from a manganese- and zinc-doped ferrite, which provides a low-field permeability of about 25,000 ⁇ 0 . Doping a barrel of brine to about 50 ⁇ 0 would require about 160 grams of this doped ferrite. Based on current prices of iron, manganese and zinc, brine doping could be accomplished for at most a few dollars per barrel, making the methods described herein economically viable for geological structure assays. Iron nanoparticle suspensions and simple slurries of iron powders having grain sizes similar to those of sand are also commercially available and are suitable for use in the methods described herein.
- the magnetic materials are modified prior to their injection into the geological structures. Modifications are used, for example, to prevent particle aggregation in the injection fluid, to reduce adhesion to the geological structures, and to maximize transport through the geological structures.
- the magnetic materials are covered with a coating such as, for example, surfactants, polymers and combinations thereof.
- Surfactants are selected from neutral, anionic, or cationic surfactants.
- the sizes of the injected magnetic materials are chosen to be most compatible with the selected magnetic imaging application.
- Typical proppants used in hydraulic fracturing operations nominally resemble sand grains having diameters between about 300 ⁇ m to about 1 mm. Hydraulic fractures, in comparison, can be about one centimeter wide or greater.
- Naturally-occurring pores in geological structures encompass a wide range of dimensions depending on local rock types and degrees of cementation. Pores in typical sandstones are in the range of about 10 ⁇ m to about 50 ⁇ m.
- Carbonates typically have a wide pore size distribution ranging between about 100 nm and about 10 mm.
- the bulk of the pore volume in common petroleum-producing rocks includes pores typically greater than about 100 nm in diameter.
- magnetic materials used in the methods described herein may be varied through a wide range of sizes to be compatible with natural pore sizes and fractures.
- the magnetic materials have diameters between about 10 nm and about 1 ⁇ m.
- the magnetic materials have diameters between about 10 nm and about 100 nm.
- the magnetic materials have diameters between about 10 nm and about 50 nm.
- particle size of the magnetic material is chosen while bearing factors other than geological structure pore size and fracture size in mind. For example, magnetic material particle size can influence the particle's observed magnetic properties, hydrodynamic radius, aggregation tendency, and extractability.
- Magnetic fields may be generated within geological structures through various means by using a magnetic probe.
- the magnetic fields can be supplied by permanent magnets, electromagnets, solenoids, antennas and combinations thereof.
- the magnetic probe produces a magnetic field that may be a DC field, an AC field, a pulsed field, or a field that varies in both time and amplitude.
- the magnetic probe field may be modulated in a manner to enable frequency-domain, time-domain or phase-shift detection methods to maximize signal-to- noise ratio, and to maximize rejection of natural background noise and 1/f noise.
- Magnetic fields are projected in the geological structures in a number of ways by using a magnetic probe.
- An illustrative means for generating a magnetic field in the geological structures involves well-bores penetrating the geological structures.
- the geological structures are penetrated by at least one well comprising a ferromagnetic material, and the ferromagnetic material is used to channel a magnetic field into the geological structures.
- Steels commonly used in drill stems and well-bore casings are typically strongly ferromagnetic with a low-field permeability up to about 5,000 ⁇ 0 .
- a magnetic probe magnetization source such as, for example, a permanent magnet or solenoid at the surface end of such well-bore casings allows a magnetic field component, B, to be transmitted along the well-bore casing into the geological structures.
- the well-bore casing therefore provides a magnetic flux distal to the magnetization source.
- the well-bore casings function analogously to an antenna for transmitting a magnetic probe signal into the geological structures.
- FIGURE 3 presents a 1:30 scale schematic model of the simulated magnetic flux generated in a pristine geological structure 300 (no native or injected magnetic material) using a magnetic well-bore 302.
- the logarithm of the magnetic field intensity is indicated by color contour in the figure.
- a magnetic probe magnetization source (not shown) is applied to surface end 301 of well-bore 302.
- the model includes empty injection zone 303 to be used for introducing magnetic material.
- well-bore 302 was chosen to be 100 meters in depth, and injection zone 303 was chosen to be 5 meters in thickness.
- Magnetic flux lines 304 are measured using movable detector 305, which is transported along surface 306 of pristine geological structure 300.
- Magnetic flux lines 304 are illustrative of those obtained in the absence of injected magnetic material.
- FIGURE 4 presents the same 1 :30 scale schematic model of the simulated magnetic flux generated in infiltrated geological structure 400 after injecting sufficient magnetic material into flooded injection zone 401 to produce a permeability of about 50 ⁇ 0 .
- magnetic flux lines 404 are measured using movable detector 405, which is transported along surface 406 of infiltrated geological structure 400.
- Comparison of the magnetic flux lines 404 in FIGURE 4 to the magnetic flux lines 304 in FIGURE 3 demonstrates that substantial changes in simulated magnetic flux can be realized by injecting magnetic materials into the geological structures.
- the models presented in FIGURES 3 and 4 are equally valid for use in operations involving magnetic material-doped water-flood or magnetic material-loaded proppant.
- the methods illustrated by the models presented in FIGURES 3 and 4 are advantageous in being applicable to both fracturing and water-flood stages of the petroleum production process. Further, the methods are readily repeatable to monitor production in near real-time, factoring into account integration time length for data acquisition and processing.
- the detected magnetic signal is correlated with an internal structure of the geological structure. For example, changes in the magnetic flux lines are indicative of internal structure alterations of the geological structure. Monitoring of changes to the internal structures of the geological structure allows production monitoring.
- the methods include detecting a magnetic signal in the geological structure before injecting the dispersion of magnetic material.
- Measuring a magnetic signal in the geological structure before production begins provides a baseline for evaluating internal structure changes resulting from fracturing or water-flood operations. For example, comparison via subtraction can be utilized to analyze the geological structure before and after production begins.
- production engineers will compare field magnetization data with mathematical models such as, for example, those presented hereinabove and related inversion techniques to infer the size, shape, and extent of magnetic material incursion in the geological structure.
- a magnetic signal may be induced at the surface or below the surface of the geological structure.
- the proximity of the at least one magnetic probe is above the geological structure.
- a magnetic field can be projected into the geological structure through a magnetic well-bore.
- the proximity of the at least one magnetic probe is within the geological structure.
- a magnetic field can be generated within the geological structure with a solenoid located within the geological structure. Magnetic fields generated within the geological structure are particularly useful for practicing the methods described herein when there is no magnetic well-bore penetrating the geological structure.
- Detection of magnetic flux lines may be conducted at one or more detection points away from the magnetic probe providing the applied magnetic field. Detection may occur on the surface of the geological structure or within the geological structure. Detection may be accomplished with a single detector or an array of detectors. Detectors may be stationary or movable to record magnetic flux data at more than one point, hi various embodiments, the detecting step is conducted with at least one detector that is movable. In various embodiments, the detecting step includes detecting a magnetic signal, moving the at least one detector, and repeating the detecting step to collect magnetic flux data at more than one point. Detector arrays are used to record magnetic signals at a number of points simultaneously.
- a single detector may be, for example, a SQUID detector or a conventional solenoid, each of which may be fixed or movable over the surface of the geological structure.
- the detecting step is conducted with at least one SQUID detector. SQUID detectors are advantageous for maximizing sensitivity in the methods described herein.
- the detecting step is conducted with at least one solenoid. For detector arrays, low cost conventional solenoids or other known magnetic sensors are more advantageous, hi still other various embodiments, the detecting step includes measuring a resonant frequency in the at least one magnetic probe. Measurement of a resonant frequency in the at least one magnetic probe provides a particularly sensitive means of magnetic permeability detection and is considered in more detail hereinbelow.
- FIGURES 3 and 4 Not all drilling applications involve a vertical well-bore as depicted in FIGURES 3 and 4.
- horizontal drilling techniques provide 'lateral' well-bores.
- Such lateral well-bores are typically used to maximize contact with a geological structure.
- Lateral well-bores may be optionally fractured prior to or during production or used in conjunction with water-flood.
- the orientation of lateral well-bores may not allow sufficient channeling of an external magnetic field into the geological structure, even when the lateral well-bore includes a ferromagnetic well casing.
- at least one magnetic detector may be placed into the well-bore to measure the magnetic flux lines.
- At least one magnetic detector may also be placed in a vertical well-bore when an external magnetic field is not sufficiently channeled into the geological structure from above using a magnetic probe, hi other various embodiments of methods for assaying a geological structure, the methods include: a) providing a dispersion of magnetic material in a fluid; b) injecting the dispersion of magnetic material into the geological structure; c) placing at least one magnetic detector into the geological structure; and d) measuring a resonant frequency in the at least one magnetic detector.
- the resonant frequency is at least partially determined by an amount of the magnetic material injected into geological structure and a location of the magnetic material relative to the at least one magnetic detector.
- the at least one magnetic detector is connected to an RLC circuit
- the methods include measuring a resonant frequency, moving the at least one magnetic detector, and repeating the measuring step.
- a resonant frequency magnetic detector may include, for example, a solenoid or a directional-loop antenna placed within a well-bore.
- a resonant frequency of a solenoid is determined by the capacitance and inductance of the C and L circuits, respectively.
- Positioning of the solenoid coil within the geological structure provides an inductance that is at least partially determined by the amount of magnetic material that is injected into the geological structure and the location of the magnetic material relative to the solenoid coil.
- FIGURE 5 presents finite-element modeling of the simulated total magnetization in a lateral well-bore as determined by a resonant frequency magnetic detector with an offset (FIGURE 5A) and non-offset (FIGURE 5B) detector configuration relative to a high-flow rate path or natural fracture channel (herein referred to as a 'runner') away from the main well-bore.
- Effects of runners in petroleum production include, for example, early water breakthrough, which impedes efficient petroleum production. Therefore, timely detection of runners is clearly desirable.
- the geological structure is injected with 50 ⁇ 0 of magnetic material, and the magnetization is determined at a detector offset of 25 meters from the runner in FIGURE 5A and zero meters from the runner in FIGURE 5B.
- the magnetic flux line changes produced with centered and offset detector configurations are illustrative of the changes observable in physical geological structures penetrated with magnetic materials during fracturing or water-flood operations. Filling of the runner with magnetic material changes the total magnetization, thereby changing L by about one part in 10 4 , as the magnetic probe position is moved away from the runner.
- Such frequency changes are typically measurable to within about one part in 10 9 or greater using electronic detectors such as, for example, frequency counters.
- electronic detectors such as, for example, frequency counters.
- the location of a flood front including progression into runners and filled fractures, may be detected using a moveable resonant frequency magnetic detector.
- the movable resonant frequency magnetic detector may be placed in the injection well-bore, production well-bore, or both well-bores.
- the movable resonant frequency magnetic detector may be located on the surface of the geological structure.
- Dipole-dipole, dipole-loop and loop-loop configurations for cross-well and borehole-to- surface electromagnetic imaging techniques have been under development for some time for detecting and imaging conductive subsurface features.
- frequency (phase) domain detection and inversion have been employed in such systems, despite their high computational intensity.
- Forward-propagation and inversion algorithms for cross-well electromagnetic propagation in diffusive media have also been under development.
- travel-time tomography potentially provides simpler electronics and reduced computational burden relative to other techniques in this field.
- Magnetic imaging techniques have not yet been applied in these more advanced geological imaging surveys.
- methods are disclosed for using magnetic materials in electromagnetic imaging techniques utilizing transmitter-receiver antenna configurations such as, for example, dipole-dipole, dipole-loop, and loop-loop configurations.
- transmitter-receiver antenna configurations such as, for example, dipole-dipole, dipole-loop, and loop-loop configurations.
- More sensitive detectors including, for example, flux-gates and SQUID detectors may also be coupled to the electromagnetic imaging techniques.
- the methods disclosed herein for using magnetic materials in dipole-dipole, dipole-loop and loop-loop configurations include development of approaches for inverting time and amplitude signals in the presence of magnetic materials and an estimation of computational intensity needed for each.
- An additional frequency domain detection technique relevant to these approaches is referred to as higher-order spectral analysis.
- the higher-order spectral analysis techniques include the use of the coherence of multiple frequency components to detect weaker signals in the presence of Gaussian and non-Gaussian noise.
- a multi-frequency coherent source or a scattering mechanism that is either nonlinear or parametric-linear is used in application of the techniques.
- Magnetic materials in these techniques is advantageous in providing signal detection (with sufficient averaging) in the presence higher noise levels than is possible with more traditional frequency domain detection techniques. Further, application of magnetic materials in the techniques allows sensor arrays to be used to determine time of arrival for inversion processing at lower signal to noise ratios.
- a consideration concerning the use of magnetic materials in imaging geological structures is a modulation of electromagnetic signal transport.
- electromagnetic signal speed decreases in accordance with the formula (1), where c is the speed
- ⁇ is the relative dielectric constant
- ⁇ is the relative magnetic permeability.
- Velocity changes in electromagnetic signals have been used extensively in the art of well logging, where the dielectric constant difference between petroleum and water shifts observed signal velocity from 5 ns/m to 29 ns/m. Electromagnetic signal velocity in an aqueous ferrofluid at 50 ⁇ o is calculated to be about 200 ns/m. Therefore, a significant electromagnetic signal velocity shift is possible for magnetically-loaded water-floods when applied to travel-time tomography imaging. Higher-order harmonics generated upon saturation of the magnetic materials would facilitate frequency domain discrimination such as, for example, through higher-order spectral analysis.
- any of the methods described hereinabove are potentially applicable for tracking pollutants within a geological structure.
- leakage from a chemical storage facility could potentially be monitored by adding a magnetic material at the chemical storage facility source and then analyzing for the presence of magnetic material in a nearby geological structure. An abrupt or gradual change in magnetic signal would indicate a leaking condition.
- the methods could potentially be used to monitor pollutant migration through a geological structure such as, for example, from agricultural runoff.
- the methods described herein could potentially be used to monitor the transport and chemical conversion of zero-valent iron particles that are used in ground water contamination remediation.
Abstract
Description
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Priority Applications (5)
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MX2010012634A MX2010012634A (en) | 2008-05-19 | 2009-01-09 | Methods for magnetic imaging of geological structures. |
EP09751010A EP2294459A1 (en) | 2008-05-19 | 2009-01-09 | Methods for magnetic imaging of geological structures |
AU2009249560A AU2009249560A1 (en) | 2008-05-19 | 2009-01-09 | Methods for magnetic imaging of geological structures |
CA2724989A CA2724989A1 (en) | 2008-05-19 | 2009-01-09 | Methods for magnetic imaging of geological structures |
BRPI0912819A BRPI0912819A2 (en) | 2008-05-19 | 2009-01-09 | methods for magnetic imaging of geological structures |
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US12/350,914 | 2009-01-08 | ||
US12/350,914 US8269501B2 (en) | 2008-01-08 | 2009-01-08 | Methods for magnetic imaging of geological structures |
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WO2009142779A1 true WO2009142779A1 (en) | 2009-11-26 |
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WO2011153339A1 (en) * | 2010-06-02 | 2011-12-08 | William Marsh Rice University | Magnetic particles for determining reservoir parameters |
WO2013012967A1 (en) * | 2011-07-19 | 2013-01-24 | Schlumberger Canada Limited | Using low frequency for detecting formation structures filled with magnetic fluid |
WO2013043075A1 (en) * | 2011-09-21 | 2013-03-28 | Baker Hughes Incorporated | Method of measuring parameters of a porous medium using nanoparticle injection |
US9512698B2 (en) | 2013-12-30 | 2016-12-06 | Halliburton Energy Services, Inc. | Ferrofluid tool for providing modifiable structures in boreholes |
US9797222B2 (en) | 2013-12-30 | 2017-10-24 | Halliburton Energy Services, Inc. | Ferrofluid tool for enhancing magnetic fields in a wellbore |
US9850733B2 (en) | 2013-12-19 | 2017-12-26 | Halliburton Energy Services, Inc. | Self-assembling packer |
US9896910B2 (en) | 2013-12-30 | 2018-02-20 | Halliburton Energy Services, Inc. | Ferrofluid tool for isolation of objects in a wellbore |
US9982508B2 (en) | 2013-12-19 | 2018-05-29 | Halliburton Energy Services, Inc. | Intervention tool for delivering self-assembling repair fluid |
US10047590B2 (en) | 2013-12-30 | 2018-08-14 | Halliburton Energy Services, Inc. | Ferrofluid tool for influencing electrically conductive paths in a wellbore |
US10876378B2 (en) | 2015-06-30 | 2020-12-29 | Halliburton Energy Services, Inc. | Outflow control device for creating a packer |
RU2757386C1 (en) * | 2020-11-16 | 2021-10-14 | Публичное акционерное общество "Газпром нефть" (ПАО "Газпром нефть") | Method for conducting electromagnetic monitoring of hydraulic fracturing |
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- 2009-01-09 WO PCT/US2009/030526 patent/WO2009142779A1/en active Application Filing
- 2009-01-09 AU AU2009249560A patent/AU2009249560A1/en not_active Abandoned
- 2009-01-09 BR BRPI0912819A patent/BRPI0912819A2/en not_active IP Right Cessation
- 2009-01-09 EP EP09751010A patent/EP2294459A1/en not_active Withdrawn
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Also Published As
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AU2009249560A1 (en) | 2009-11-26 |
CA2724989A1 (en) | 2009-11-26 |
BRPI0912819A2 (en) | 2016-09-27 |
MX2010012634A (en) | 2011-02-25 |
EP2294459A1 (en) | 2011-03-16 |
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