WO2013162400A1 - Détermination des propriétés physiques de matériaux solides suspendus dans un fluide de forage - Google Patents

Détermination des propriétés physiques de matériaux solides suspendus dans un fluide de forage Download PDF

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Publication number
WO2013162400A1
WO2013162400A1 PCT/RU2012/000320 RU2012000320W WO2013162400A1 WO 2013162400 A1 WO2013162400 A1 WO 2013162400A1 RU 2012000320 W RU2012000320 W RU 2012000320W WO 2013162400 A1 WO2013162400 A1 WO 2013162400A1
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WIPO (PCT)
Prior art keywords
samples
drilling
drilling fluid
sample
borehole
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PCT/RU2012/000320
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English (en)
Inventor
Ivan Vladimirovich Nikolin
Original Assignee
Siemens Aktiengesellschaft
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Priority to PCT/RU2012/000320 priority Critical patent/WO2013162400A1/fr
Publication of WO2013162400A1 publication Critical patent/WO2013162400A1/fr

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Classifications

    • 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
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/065—Separating solids from drilling fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2823—Raw oil, drilling fluid or polyphasic mixtures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material

Definitions

  • the invention generally refers to the field of mining and exploration. More particularly, the invention relates to an automated method and an apparatus for determining physical properties of samples suspended in a drilling fluid, wherein the physical properties of the samples are determined while a borehole for extraction of a natural resource, particular oil or gas, contained in a subterranean reservoir is drilled.
  • MWD Measurement While Drilling
  • Detailed records, i.e. well logs, of the geologic formations penetrated by boreholes are typically based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements performed by instruments lowered into the borehole or well (geophysical logs) .
  • Well logging is practised nowadays during all phases of the devel- opment of an extraction site, i.e. during drilling, completing, producing and abandoning of the borehole or the well.
  • the operator of the extraction site usually has to stop the production of the borehole or well when well logging procedures are performed. Hence, the development of alternative procedures that may avoid a delay of production are desired.
  • M D devices are capable of performing various meas- urements such as measuring naturally occurring gamma radiation to characterise the rock or sediment in the borehole. Furthermore, MWD device are capable of measuring borehole pressure, temperature, vibration, torque and the like. Advanced MWD devices of the prior art are adapted to measure formation pressure and take information samples. MWD devices additional provide means of communication for operating rotary steering tools.
  • MWD devices may be provided with means of digi- tal storage so that measurement results may be digitally stored. Additionally, measurements results may be transmitted digitally to the surface via mud pulse telemetry.
  • Mud pulse telemetry describes a method of data transmission, wherein pressure fluctuations are generated in the drilling fluid and used as signals.
  • a downhole valve may be operated to restrict the flow of the drilling fluid or slurry according to the digital information to be transmitted. Accordingly, pressure fluctuations propagating within the drilling fluid are received by pressure sensors. The pressure fluctuations may al- so be used as signals for controlling the MWD device.
  • special core analysis provides supplementary information on the subterranean rock formations abundant at the extraction site.
  • Special core analysis includes laboratory experiments performed on core plugs or core samples taken from the natural reservoir.
  • core analysis requires expensive procedures for acquisition of the core samples.
  • procedures of mud logging and sample logging are well established in the state of art.
  • a standard mud log usually includes real-time drilling parameters such as a rate of penetration, lithology, flow line temperature, mud weight and/or estimated pore pressure. Chemical parameters may include the determination of concentration's of hydrocarbons and/or chlorides. Sample logs are usually made by examining samples or cuttings circulated to the surface by the drilling fluid, sometimes also called drilling mud, in rotary drill- ing.
  • the samples are suspended in the drilling fluid that enters the borehole via a drill pipe, sometimes also called drill sting. Accordingly, samples originating from a drilling depth return to the surface via an annulus of the borehole.
  • the samples are then transported to separation devices, in particular shale shakers, for separation from the drilling fluid.
  • Shale shakers typically comprise flat sheets of wire mesh screens or sheats that shake or vibrate so as to separate the samples from the fluid as drilling mud flows through them. Samples are collected at regular time intervals and an- alysed and described by a geologist or a mud logger. Although sand and shale make up the majority of the samples encountered while drilling boreholes, depending on the location, any number of formations can actually be encountered. It is an object of the present invention to provide an automated method for determining physical properties of the samples suspended in the drilling fluid that is capable of providing a comprehensive survey of the extraction site while minimising production delay.
  • the object is achieved by an automated method for determining physical properties of samples suspended in a drilling fluid while drilling a borehole for extraction of a natural resource, in particular oil or gas, contained in a subterranean reservoir, that comprises the steps of
  • separating the samples from the drilling fluid analysing the separated samples by means of electron microscopy, magnetic resonance imaging and/or computer tomography, the step of analysing including the generation of at least one image of at least one of the samples and the deter- mination of at least one physical property of the at least one sample ;
  • the drilling fluid suspending the samples originating from one of the drilling depths is automatically extracted from the borehole via the annulus and transported to a separation device.
  • the samples are separated from the drilling fluid, in particular by means of sieving.
  • the separated samples are then transported to an analysis device capable of analysing the separated samples by means of electron microscopy, magnetic resonance imaging and/or computer tomography.
  • the samples are analysed in a manner such that at least one image of the at least one of the sample is generat- ed and at least one physical property of the least one sample is automatically determined.
  • the steps of extracting, separating and analysing is repeated for different drilling depths, i.e. different samples are automatically extracted, separated and analysed at regular time intervals during the drilling procedure of the borehole.
  • the method for determining the physical properties of the samples may be fully automated so that the determination of the physical properties occurs in real time during the drilling procedure. Additionally, comprehensive information on the various rock for- mations may be collected by the sophisticated methods of electron microscopy, magnetic resonance imaging and/or computer tomography. A comprehensive survey including the data of determined physical properties of samples originating from different rock formation may be used as the basis for both operational decisions while drilling and for reservoir development strategy.
  • the at least one property is determined by means of image processing.
  • Image processing is a means suitable for express analysis as algorithms are available that are capable of determining parameters relating to physical properties of the samples from image data in real time. Consequently, the procedure of drilling the borehole does not have to be inter- rupted for determination of the at least one physical property and production delay is minimised.
  • the at least one physical property is a size, porosity or crystal structure of the at least one sample or an average size, in particular average size of pores, of the samples originating from one of the rock formations of the subterranean reservoir.
  • the at least one physical property is determined from the image data of the at least one image.
  • the at least one physical property may be determined from the series of images with increased accuracy.
  • the physical property is preferably automatically determined by the means of image processing, whereby the surface of the at least one sample is automatically recognised and evaluated by a suitable computerised method, in particular an image processing algorithm.
  • the at least one image is generated from back-scattered electrons.
  • Electron microscopy is a powerful technique to image the mi- crostructure in particular of porous samples that has already found application in digital rock physics including thin- section imaging to build three dimensional porous media mod- els using process-based geostatistical modelling, multiple- scale imaging for shale and carbonate analysis, nano- resolution three dimensional image reconstruction, sample mineral content and special distribution study, and qualita- tive core structure analysis for engineering and research and development purposes .
  • Electron microscopy, computer tomography and/or magnetic res- onance imaging is now suggested to be performed directly on the extraction site for analysing the contents of the drilling mud emerging from the annulus of the borehole during the process of drilling.
  • the method may be automated so as to provide key information about the various rock formations of the natural reservoir in minimal time.
  • the drilling of additional boreholes for surveillance purposes only is thus obsolete.
  • images generated from back-scattered electrons are provided with sufficient resolution so that the at least one physical property may be determined with improved accuracy.
  • the analysis of the samples originating from one of drilling depths is preferably supplemented by means of x-ray spectros- copy.
  • the step of analysing includes analysing the at least one sample by means of x-ray spectroscopy and determining at least one additional physical property from data provided by the x-ray spectroscopy.
  • a region of the at least one sample is analysed by means of x-ray spectroscopy. Recording of spectra provides additional information, in particular about chemical constituents included in the at least one sample.
  • Energy-dispersive x-ray spectroscopy provides an analytical tool for the elemental and/or chemical characterisation of the at least one sample. It includes the step of focussing a beam of electrons or x-rays on the at least one sample or the region of the at least one sample so as to stimulate the emission of characteristic x-rays.
  • the additional physical property is determined from the observed characteristic x-ray spectra. Accordingly, the at least one additional physical property determined by means of x-ray spectroscopy is a concentration of chemical constituents included in the at least one sample.
  • a concentration of a chemical element such as oxygen, sodium, magnesium, aluminium, silicon, chloride, potassium, calcium, titan, iron, carbon, phosphorus, and/or sulphur may be obtained.
  • chemical compounds contained in the at least one sample are identified by analysing the data of concentrations of different chemical elements.
  • the at least one sample may be identified as containing Si0 2 or quartz when the concentrations for silicon and oxygen substantially corresponds to a relation 1 : 2.
  • the concentrations of chemical elements are determined by the observed intensities of the characteristic x-ray spectra.
  • the beam of x-rays is automati- cally focussed on a region that is of particular interest and includes a pre-determined structure that is recognised by image processing.
  • Parameters used for the selection of the region may include a crystal structure, porosity, pore size or the like previously determined by said means of image pro- cessing. Accordingly, a fully automated method capable of determining various physical properties including chemical characteristics is provided.
  • the drilling fluid suspending the samples from the borehole and to continuously separate the samples from the drilling fluid and to continuously analyse the samples while the borehole is drilled.
  • the physical properties of the samples originating from different drilling depths are determined in real time during the process of borehole drilling.
  • the images characterising the samples and/or the spectra recorded by means of x-ray spectroscopy are stored in a suitable digital storage means for later analysis.
  • Alternative embodiments utilising three dimensional computer tomography or magnetic resonance imaging include, during the step of analysis, the rotation of the at least one sample or the rotation of a computer tomograph or a magnetic resonance tomograph so as to provide three dimensional image data suitable for generating three dimensional images of the at least one sample.
  • the samples are cleaned thoroughly so that accurate images may be acquired by means of a three dimensional tomography.
  • the physical properties and/or the additional physical properties of the samples originating from different drilling depths are recorded in a well log.
  • all physical properties and additional physical properties determined for each sample and for each drilling depth are recorded in the well log along with the values for the drilling depth or other drilling parameters.
  • the well log provides information that may be used for operational decisions when drilling the borehole or for considerations on further development of the extraction site. It is suggested to preferably record physical properties and/or additional physical properties characterising various subterranean rock formations of the natural reservoir such as porosities, crystal structures, chemical constituents, concentration of existing chemical compounds, gamma ray emission and others with respect to the depth in which the corresponding rock formation may be found.
  • the invention relates to an apparatus for determining physical properties of samples suspended in the drilling fluid while drilling the borehole for extraction of a natural resource, in particular oil or gas, contained in the subterranean reservoir that is adapted to execute the method as described herein before.
  • the apparatus comprises a first means of transport for transporting extracted drilling fluid suspending samples originating from a drilling depth of the borehole to a separation device, the separation device for separating the samples from the drilling fluid, a second means of transport for transporting samples separated from the drilling fluid to an analysis device and the analysis device for analysing the separated samples by means of electron microscopy, magnetic resonance imaging or computer tomography.
  • the analysis devices is adapted to generate at least one image of the samples and the determination of at least one physical property of the at least one sample.
  • the first and second means of transport may be configured as suitable pip- ing, conveyor belt or the like.
  • the separation device is a shale shaker adapted to separate the samples from the drilling fluid by means of sieving or filtering.
  • the analysis device comprises at least one of an elec- tron microscope, magnetic resonance tomograph and/or computer tomograph.
  • the apparatus allows for an analysis of samples collected at different drilling depths of the borehole. Moreover the analysis may be performed at the extraction site and in real time so as to supply the operator drilling the bore- hole with information allowing for, in particular, adoption of at least one drilling parameter to the at least one determined physical property. Drilling parameters include, amongst others, a rate of penetration and/or a torque exerted on the drill bit.
  • the analysis device is capable of image processing.
  • the analysis device thus includes suitable analysis electronics such as computers running suitable algorithms and/or software, in particular software capable of imaging processing.
  • the analysis device comprises an electron spectrometer, in particular an energy dispersive electron spectrometer, so that spectra of samples may be determined. Determination of energy spectra by means of recording characteristic x-rays emitted from the samples allows for evaluation of chemical constituents, in particular concentrations of chemical elements existing in the samples. Accordingly, the additional physical property determined by means of x-ray spectroscopy may provide key information for the exploration of the natural resource.
  • the apparatus is ca- pable of continuously extracting the samples from the borehole, continuously separating the samples from the drilling fluid and continuously analysing the samples. Accordingly, the well log is automatically recorded during the drilling process of the borehole.
  • Fig. 1 schematically illustrates an apparatus 1 capable of determining physical properties of samples S contained in subterranean rock formations 2 located at an extraction site 3 of a natural reservoir.
  • the apparatus 1 comprises a first means of transport 4 configured as a pipe adapted to collect drilling fluid F suspending samples S from an annulus 5 of the borehole 6.
  • the drilling fluid F suspending the samples S originating from a drilling depth D of the borehole 6 is transported to a separation device 7 arranged as a shale shaker.
  • the separation device 7 comprises an arrangement of wire grids, sieves or the like suitable for extracting samples S of suitable size from the drilling fluid F.
  • a second means of transport 8 configured as a conveyor belt transports the separated samples S to an analysis device 9 that includes an electron microscope capable of generating multi-scale images of the samples S.
  • the analysis device 9 comprises a computer tomograph.
  • the analysis device 9 is provided with a magnetic resonance tomograph.
  • the analysis device 9 comprises an x-ray spectrometer capable of analysing the samples S by irradiating regions of the samples S with a focussed x-ray beam. Characteristic x-rays emitting from the irradiated regions of the samples are recorded as spectra containing information about chemical constituents.
  • the drilling fluid F carries the samples S excavated by a drill bit (not illustrated) up to the surface.
  • the drilling fluid F is thixotropic and becomes a gel under static condi- tions. This keeps the cuttings or samples S suspended when a drilling process is interrupted, for example for maintenance purposes .
  • a drill string 10 carrying the drill bit is lowered by a rate of penetration.
  • the drilling fluid F enters the borehole 6 via the drill string 10 and carries samples S from the bottom of the borehole 6 located at depth D back to the surface.
  • the annulus 5 defined as the space between the boundaries of the borehole 6 and the drill string 10 conducts the drilling fluid F suspending the samples S up to the surface.
  • the drilling fluid F containing samples S is transported to the separation device 4. After separation of the samples S, the drilling fluid F is reintroduced into the drill string 10, whereas the separated samples S are transported by the second means of transport 8 to the analysis device 9 for direct investigation at the ex- traction site 3.
  • At least one image of each of the collected samples S is generated.
  • the images are generated by means of electron microscopy, computer tomography or magnetic resonance imaging. Additionally, a selected region of each of the samples S is in- vestigated by means of x-ray spectroscopy.
  • Fig. 2 shows an exemplary image generated by means of electron microscopy of one of the samples S as collected at different drilling depths D.
  • Tomography and microstructure of the collected sample S is analysed by using secondary and back-scattered electron regimes.
  • the composition of the samples is investigated by means of energy dispersive x-ray spectroscopy.
  • the image of fig. 2 illustrates schematically surfaces of the samples S.
  • Images of the samples S are acquired using back scattered electrons regime with Z-contrast.
  • the gray scale level of a pixel depends on the composition: the higher the atomic number of an element located on the surface region being scanned, the brighter the pixel.
  • the images recorded at different drilling depths D are analysed by means of digital image processing.
  • the sample S contains a solid phase SI and a porous phase S2.
  • the solid and porous phases SI, S2 were determined by means of image processing. Surface po- rousity was found to be 13,7 %.
  • Fig. 4 shows another image of another exemplary sample S extracted from the borehole 6.
  • a region R selected by means of image processing is investigated by means of x-ray spectroscopy.
  • the region R is investigated by means of energy-dispersive x-ray spectroscopy.
  • the region R is irradiated with a high-energy beam of x-rays so as to excite electrons bound to the nuclei from a ground state into an excited state. When the excited electrons return to the ground state, characteristic x-rays are emitted.
  • the chemical constituents, in particular chemical elements are identified by observing the spectra of the characteristic x-rays. Furthermore, concentrations of chemical constituents are evaluated from relative intensities of characteristic peaks observed in the x- ray spectra.
  • Fig. 5 shows an exemplary spectrum recorded by means of x-ray spectroscopy. The spectrum originates from a barium and boron rich inclusion found in the sample S. The intensity I of the observed characteristic x-rays versus energy E is shown.
  • the physical properties of the samples S extracted from the borehole 6 at different time intervals correspond to different rock formations 2 located below the surface at various drilling depths D. All determined physical properties are recorded in well or electron microscopy log.
  • the recorded log includes a plurality of graphs that show the acquired sample properties with respect to the drilling depth D.
  • the EM- log (electron microscopy log) is a new type of well log that contains comprehensive information about the rock formations 2 of the extraction site 3. This reduces the necessity to acquire addi- tional information by means of well logging subsequent to the drilling process as most of the reservoir properties are already included in the EM- logs.
  • the at least one image of the at least one sample S collected at one of the drilling depths D is recorded by means of computer tomography or magnetic resonance imaging. Accordingly, the determined physical properties of the different samples S collected at different drilling depths D are recorded in a well log called computer to- mography log (CT-log) or magnetic resonance imaging log (MRI- log) . Essentially the CT-log and the MRI-log contain the information of the EM- log and is recorded in a similar way.
  • Main difference of utilising means of computer tomography or magnetic resonance imaging is that the sample S is rotating during generation of the at least one image so as to create three dimensional images data.
  • the computer tomograph or the magnetic resonance tomograph is rotated around the sample S when the image is recorded.
  • Direct proportionality of the sample S acquisition time and drilling depth D allows for generating graphs and logs similar to those produced by well logging procedures.
  • the EM- , CT-, or MRI-log contains more comprehensive data and are already recorded during the drilling procedure so as to avoid unnecessary delays.

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Abstract

L'invention concerne la détermination des propriétés physiques d'échantillons suspendus dans un fluide de forage. L'invention concerne un procédé automatisé pour la détermination des propriétés physiques de matériaux solides (S), tels que des déblais de forage, suspendus dans un fluide de forage (F) pendant le forage d'un trou de forage (6) pour l'extraction d'une ressource naturelle, notamment du pétrole ou du gaz, contenue dans un réservoir souterrain, comprenant les étapes suivantes : - l'extraction du fluide de forage (F) dans lequel sont suspendus des échantillons (S) issus d'une profondeur de forage (D) du trou de forage (6); - la séparation des échantillons (S) du fluide de forage (F); - l'analyse des échantillons séparés (S) par microscopie électronique, spectroscopie de rayons X, imagerie à résonance magnétique et/ou tomographie par ordinateur, l'étape d'analyse comprenant la génération d'au moins une image d'au moins un des échantillons (S) et la détermination d'au moins une propriété physique du ou des échantillons (S); - la répétition des étapes d'extraction, de séparation et d'analyse pour différents échantillons issus de différentes profondeurs de forage (D).
PCT/RU2012/000320 2012-04-25 2012-04-25 Détermination des propriétés physiques de matériaux solides suspendus dans un fluide de forage WO2013162400A1 (fr)

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WO2016077869A1 (fr) * 2014-11-19 2016-05-26 Deep Exploration Technologies Crc Limited Système et procédé d'échantillonnage et d'analyse destinés à être utilisés dans les forages d'exploration
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US10598581B2 (en) 2013-11-06 2020-03-24 Aspect Imaging Ltd. Inline rheology/viscosity, density, and flow rate measurement
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US10809338B2 (en) 2015-04-12 2020-10-20 Aspect Ai Ltd. System and method for NMR imaging of fluids in non-circular cross-sectional conduits
US10989646B1 (en) 2020-05-21 2021-04-27 Halliburton Energy Services, Inc. Real time magnetic properties of drill cuttings, drilling fluids, and soils
US11480053B2 (en) 2019-02-12 2022-10-25 Halliburton Energy Services, Inc. Bias correction for a gas extractor and fluid sampling system

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