• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    apparatus for measuring stress on a downhole component and method of monitoring a drilling operation. The present invention relates to an apparatus for measuring stress on a downhole component including: at least one stress sensing device (38) disposed proximate a surface of a component of a drilling assembly or disposed within. of a material that forms the component; and a processor (49) in operative communication with the at least one voltage sensitive device (38), the processor (49) configured to detect changes in the at least one voltage sensitive device (38) and detect at least one of erosion, crack formation and crack propagation on the component surface. an apparatus for measuring strain on a downhole component includes: at least one strain gauge deposited on a surface of a drive shaft (32) or disposed within a material that forms the drive shaft (32); and a processor (49) in operative communication with the at least one strain gauge, the processor (49) configured to detect changes in the at least one strain gauge and detect conditions affecting the operation of the drive shaft (32).
    公开号:BR112014020230B1
    申请号:R112014020230-3
    申请日:2013-02-20
    公开日:2021-07-13
    发明作者:Sunil Kumar；Harald Grimmer；Hendrik John；Thomas Kruspe；Andreas Peter；Michael Koppe
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    Cross reference to related orders
    [0001] This application claims the benefit of US Application No. 13/401158, filed February 21, 2012, which is incorporated herein by reference in its entirety. Background
    [0002] During drilling operations, sensors are often used to measure various forces exerted on the drill string. Example forces include bending and weight forces per bit on various parts of the drill string. These forces can affect the dynamic behavior of the drill string, and if not monitored, can result in damage to downhole components or compromised operation.
    [0003] For example, during drilling operations using a downhole or mud motor, the drive shaft connecting the motor to a drill undergoes very high bending and torque loads during rotation, and also experiences loads of high vibration. Due to these high load conditions, the drive shaft material fatigues, which can lead to crack initiation and propagation, and ultimately drive shaft failure. SUMMARY
    [0004] An apparatus for measuring stress on a downhole component includes: at least one stress-sensitive device disposed close to a surface of a component of a downhole drilling assembly or disposed within a material that form the component; and a processor in operative communication with the at least one voltage sensitive device, the processor configured to detect changes in the at least one voltage sensitive device and detect at least one erosion, crack formation and crack propagation on the surface of the component.
    [0005] An apparatus for measuring strain on a downhole component includes: at least one strain gauge deposited on a surface of a drive shaft of a downhole drilling assembly or disposed within a material that forms the drive shaft; and a processor in operative communication with the at least one strain gauge, the processor configured to detect changes in the at least one strain gauge and detect conditions affecting the operation of the drive shaft.
    [0006] A method for monitoring a drilling operation includes: placing a drilling assembly of a well, the drilling assembly including at least one strain gauge disposed on or near a surface of a component of the drilling assembly. downhole, or disposed within a component-forming material; perform a drilling operation; and detecting changes in the strain gauge during the drilling operation and analyzing the changes to monitor one or more loads on the component, and determine at least one of a magnitude of one or more loads and a number of load cycles experienced during the operation. drilling; and detecting conditions that affect the drilling operation based on at least one of the value and number of load cycles. BRIEF DESCRIPTION OF THE DRAWINGS
    [0007] The object, which is considered to be the invention, is particularly stressed and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features and advantages of the invention are evident from the following detailed description taken in conjunction with the accompanying drawings, in which like elements are numbered in the same way, in which:
    [0008] FIGURE 1 is an exemplary embodiment of a drilling system that includes a drill string disposed in a well in a soil formation;
    [0009] FIGURE 2 is a perspective view of an exemplary drive shaft assembly;
    [0010] FIGURE 3 is a perspective view of an embodiment of a component condition sensing device (e.g. stress, crack formation/propagation, erosion and/or abrasion) or mechanisms of the system of FIGURE 1;
    [0011] FIGURE 4 is a top view of one embodiment of a strain gauge of the system of FIGURE 1;
    [0012] FIGURE 5 is a top view of the exemplary strain gauge configurations of the system of FIGURE 1;
    [0013] FIGURE 6 is a side view of a stress sensing configuration for a multilayer component coating; and
    [0014] FIGURE 7 is a flowchart illustrating an exemplary method of fabricating downhole component stress monitoring and/or stress monitoring systems. DETAILED DESCRIPTION
    [0015] Referring to FIGURE 1, an exemplary embodiment of a downhole drilling system 10 disposed in a well 12 is shown. Drill string 14 is disposed in hole 12, which penetrates at least one soil formation 16. Although well 12 is shown in FIGURE 1 to be of constant diameter, the well is not so limited. For example, well 12 can be of variable diameters and/or directions (eg slope and azimuth). The drill string 14 is made from, for example, a tube, multiple tube sections or spiral tubes. System 10 and/or drill string 14 includes a drill assembly 18, which can be configured as a downhole assembly (BHA). Various measurement instruments can also be incorporated into the system 10 to affect measurement regimes, such as wired measurement applications or log during drilling (LWD) applications.
    [0016] The drill assembly 18 includes a drill bit 20, which is attached to the lower end of the drill string 14 and is configured to be transported into hole 12 from a drill rig 22. In the embodiment shown in FIGURE 1 , the drill 20 is operatively connected to a positive displacement motor 24, also described as a mud motor 24, to rotate the drill 20. While the embodiments described herein include a positive displacement motor, such embodiments can include any type of downhole engine, such as a turbine engine, and are not limited to drilling engines.
    [0017] The slurry motor 24 includes a feed section having a rotor 26 and a stator 28 disposed therein, and an optional steering mechanism 30 (eg an adjustable folded casing). A drive shaft 32 is connected to at least the feed section to rotate the drill 20. A bearing assembly 34 may also be included to support the drive shaft 32. Additional bearing assemblies may also be included as part of , for example, the feed section, steering mechanism and the connections between the various components of the perforation assembly 18.
    [0018] An example of a drive shaft 32 is shown in FIGURE 2, which illustrates a bit coupling assembly that includes a bearing assembly 34 and a drive shaft 32, which is connected to the motor 24 and couples the motor 24 to drill 20. In one example, drive shaft 32 is coupled to drill 20 via a flexible shaft 36.
    Referring again to FIGURE 1, various components of drill string 14 and/or drill assembly 18 include one or more strain gauges 38 disposed on their respective surfaces. For example, strain gauge 38 may be disposed on one or more surfaces of the feed section, drive shaft 32, flexible shaft 36, bearing assembly 34, or all areas that experience high loads or stress concentrations, such as pockets or recesses in the drill string (eg a pocket 40 for housing electronic components). Other exemplary components on which the strain gauge 38 may be disposed include housing-pin connectors (e.g., pin strain relief structures), bearing assemblies and/or drill rollers, thrust bearings, thrust bearings, and radial bearings higher and lower.
    [0020] In one embodiment, each strain gauge 38 is directly deposited onto the surface through, for example, spraying or deposition forms. FIGURE 3 shows an example of a strain gauge 38 sprayed or otherwise deposited directly onto a surface 42 of the drive shaft 32. The strain gauge 38 in this example is a thin film plated on the strain gauge. As shown in FIGURE 3, in embodiment, the strain gauge 38 is a thin film or spray strain gauge. As shown in FIGURE 3, strain gauge 38 includes conductors 44, which are deposited directly onto drive shaft 32 (or other component) to measure the strain/strain the shaft 32 is subjected to during operation. The gauge probes 46 can be attached to the ends of the conductors 44. The strain gauge 38 can be deposited directly onto the shaft 32 such that it is in direct contact with the shaft material and flush with the top surface. Any of various deposition techniques can be used to deposit the strain gauge, such as spraying, evaporation, chemical vapor deposition, laser deposition, injection printing, screen printing, inkjet printing, lithographic patterning, electroplating, and others. Although strain gauge 38 is described herein as deposited on a surface, such strain gauge 38 can also be applied to the surface through other techniques or mechanisms, such as gluing the strain gauge to the surface.
    [0021] As shown in FIGURE 3, the strain gauge 38 can be used to measure strain, and also to detect and/or monitor crack formation. For example, one or more strain gauges 38 can be used to detect the formation and/or growth of a crack or other discontinuity that may form on surface 42. For example, as a crack 50 develops under the strain gauge 38, the meter itself is configured to break as well (or otherwise deform), which causes a signal produced by strain meter 38 to indicate a change in resistance or to be cut off completely, which indicates that a fissure was formed. Other conditions that can be monitored include surface abrasion and/or erosion of the outer layers of a component or protective coatings, which can put pressure on the meter 38 and/or eliminate the meter circuitry.
    [0022] In one example, the strain gauge 38 includes one or more resistive traces configured to change resistance due to the cracking of a trace. In another example, the strain gauge includes an ultrasonic transducer, including an ultrasonic wave source and one or more ultrasonic detection traces (eg, piezoelectric traces) configured to detect changes in wave propagation that may occur due to a modified surface (eg through erosion, abrasion, crack formation and/or crack propagation). Residuals can be configured as one or more elongated lines or a matrix that spans a selected area of the surface.
    [0023] Referring to FIGURE 4, the strain gauge 38 can be deposited on a thin insulating or passivation layer 48 to prevent short circuiting across the surface 42, if the surface is made of an electrically conductive material. If the surface is non-metallic or non-conductive (eg, includes a pre-existing insulation coating), then passivation layer 48 may not be needed. In one embodiment, if an insulating layer 48 is included between strain gauge 38 and the surface, layer 48 is made from a material that is configured to break or otherwise deform with the surface. For example, the layer material is chosen or configured to be sufficiently brittle (that is, at least as brittle as the surface material in the operating environment) so that the layer breaks, along with the cracks that form in the surface. Examples of such materials include ceramic materials and oxide materials (eg, silicon oxide, aluminum oxide and zirconium oxide). In one embodiment, one or more protective layers 60 (illustrated in FIGURE 6) are disposed over the strain gauge. The protective layer can be, for example, a polymer or epoxy material, a metallic material, or any other suitable material configured to withstand the temperatures encountered in a downhole environment.
    [0024] As shown in FIGURES 3 and 4, the strain gauge 38 may include a deposited conductor made from a conductive material such as a metallic material (eg aluminum or nickel-chromium) or graphite. For example, the conductor is formed on the surface by directly depositing voltage sensitive materials such as NiCr or CuNi. Other examples of suitable stress sensitive materials also include diamond-containing nickel such as carbon films and Ag-ITO compounds. The strain gauge 38 is not so limited, and may be made from any suitable material or include any mechanism sufficient to generate a signal indicative of pressure on a surface or within a material or layer of the component. In one embodiment, strain gauge 38 includes a piezoelectric material that is deposited directly onto a drive shaft or other surface of the component using, for example, screen printing or spraying techniques. For example, piezoelectric materials formed as part of, for example, ultrasonic transducers, can be modeled directly on the surface and used to detect crack propagation. If the surface is non-conductive (eg a composite drive shaft), the piezoelectric material can be integrated into the surface material, eg in the form of fibers. This can allow load control along most of the driveshaft. The same technique can be used on other components such as pump turbine blades, areas of concentration of effort (eg pockets).
    [0025] The configuration or pattern of deposited sensors is not limited to the configurations described in FIGURES 3 and 4. For example, conductors 44 can have any suitable length, which is to be monitored, for example, can extend along the entire length of the drive shaft 32 (or other components). In one embodiment, strain gauge 38 is configured as elongated single-layer or multi-layer conductors, piezoelectric and/or ultrasonic detectors that extend along the length to be monitored. A continuous or grid-style layer can be deposited, which can be used to monitor crack propagation over a large area, and/or can also be used to monitor stress over a larger area.
    [0026] The strain gauge 38 also includes, or is connected to, means for communicating signals to receivers, such as a user and/or a processing unit 49 located at the surface location or disposed at the downhole. For example, strain gauge 38 can be designed with an antenna to power and/or interrogate strain gauge 38 or with wires running along the shaft and connecting to electronics via bearings (eg via slip rings, brush contacts). Other exemplary means of communication include a radio frequency identification (RFID) tag connected to each strain gauge 38. Other mechanisms for wireless communication from strain and crack sensors may be based on capacitive, acoustic, optical or inductive coupling. The strain gauge 38 transmits signals to a processor in the form of, for example, voltage variations, to a desired location. Signals and data can be transmitted through any suitable transmission device or system, such as various wireless configurations as described above and wired communications. Other techniques used to transmit signals and data include wire tube, electrical and/or fiber optic links, mud pulse, electromagnetic and acoustic telemetry.
    [0027] FIGURE 5 illustrates an example of various configurations that can be used to measure voltage. For example, strain gauge 38 can be deposited in configurations that allow for axial or longitudinal loads or lateral (bending) loads and/or torsional loads. The orientations and numbers of each strain gauge 38 are merely exemplary and not limited to those described herein.
    [0028] In this example, the drill string 14 defines a central longitudinal axis 52, referred to as the "drilling string axis" or "string axis". Each strain gauge 38 also defines a "strain gauge axis" or "meter axis" 54, which corresponds to the sensing direction of the conductors for which resistance changes are measured. For strain gauges of the type illustrated here, the axis of the strain gauge 54 corresponds to the direction of the elongated conductors and also to the direction of greatest sensitivity. For example, one or more gauges 38 are configured so that axis indicator 54 is at least substantially parallel to the axis of column 46, to measure axial forces that can be used to estimate parameters, such as weight in bits (WOB). In another example, one or more gauges 38 are oriented such that the axis of gauge 54 is at least substantially parallel to allow estimation of, for example, bending forces. In yet another example, one or more gauges 38 can be oriented about 45 degrees relative to the axis of column 52 to measure torsional stress, which can be used to estimate torque in parts of the column (eg, TOB) . An exemplary configuration includes four strain gauges that are axially oriented and positioned 90° apart around the drive axis for measuring axial loads, and two strain gauges are oriented 45° to the column axis. for torque measurement. It should be noted that multiple assemblies and strain gauges or with different orientations can be operably linked, for example as part of a single assembly or bridge circuit. In one embodiment, one or more strain gauges are electrically wired as part of a bridge circuit, such as a Wheatstone bridge.
    [0029] Referring to FIGURE 6, in one embodiment, multiple strain gauges 38 are installed with respective layers of a multi-level casing on a downhole component. For example, drive shaft 32 includes a multi-layer protective coating on an outer surface, wherein alternating layers of a metallic coating (56) and layers of a hard coating such as a ceramic or polymer coating (58) ) are disposed or deposited. At least one thin film tension gauge 38 is sprayed or otherwise deposited onto a surface of (or incorporated into) each layer to monitor the tension in each layer. Various conditions such as erosion, abrasion or breakage of each layer 56, 58 can be monitored. For example, when a specific layer 56, 58 is cracked or eroded, a signal from the respective meter 38 is altered or lost completely. This setting can be used to, for example, determine when a part of a protective coating is fully eroded (thus exposing the drive shaft surface to the environment) through detection, when the innermost strain gauge signal is lost.
    [0030] The embodiments of FIGURE 6 can be used in conjunction with a component such as a pulse generator that has parts that are exposed to intense erosion through impacting sand particles. The component can be coated with various levels of hard protective coatings with a voltage sensitive resistive layer and/or cracks formed as a grid enter such that, when a protective layer is breached, an electrical signal is generated, which alerts a user or processor that a protective coating has been violated. Multi-level resistive elements will allow quantification of protective coating(s), which remain inviolate.
    [0031] With reference to FIGURE 7, an exemplary method 60 of fabrication of downhole component strain monitoring systems and/or downhole component strain monitoring systems is shown. Method 60 includes one or more steps 61 to 64. In one embodiment, method 60 includes performing all steps 61 to 64 in the order described. However, certain steps can be omitted, phases can be added, or the order of phases changed.
    [0032] In the first stage 61, the strain gauge 38 is deposited on or on the surface of the drive shaft 32 or other components. An exemplary process is a sprayed thin-film deposition technique, which includes optionally depositing an insulating layer onto the surface, depositing and/or etching a thin-film conductor onto the insulating layer, and optionally depositing or de another way covering the conductor with a protective layer.
    [0033] For example, the insulation layer is sprayed onto the surface, and the conductor is formed by deposition of a thin film of a resistant alloy or metal and engraving (eg laser engraving) of the film in balanced resistors . Exemplary techniques for thin-film conductor and/or insulating layer deposition include spraying, evaporation, pulsed laser deposition, chemical vapor deposition, and others.
    [0034] In this example, at least the insulating layer and the conductor are deposited as thin-film layers. The insulating layer can be of any suitable material, including dielectric materials such as plastic or ceramic. Exemplary insulation materials include polyamide and epoxies. Conductive materials can be any suitable conductive materials, including metals such as copper and copper alloys (eg Copel), platinum and platinum alloys, nickel, isoelastic alloys and others.
    [0035] In the second step 62, the column 14 and/or the drilling assembly 18 are disposed at the bottom of the well, for example, during a drilling operation or recording during drilling (LWD). Column 14 can be configured as any desired type, such as a measurement column or a completion column.
    [0036] In the third step 63, the voltage on various components of the chain 14 is measured during a drilling or LWD operation (or other desired operation) by transmitting an electrical signal to the voltage meter 38 and measuring the change in conductor resistance 44. The transmission and detection can be carried out by, for example, the processing unit 49.
    [0037] In the fourth stage 64, the change in resistance (for example, indicated by the change in voltage received in a strain gauge 38) is analyzed by, for example, the processing unit 49 to determine the pressure on the surface of the component respective. This stress information is further analyzed to measure various forces or downhole parameters such as WOB, compressive forces, bending forces, torsional forces, crack formation, erosion and abrasion.
    [0038] In one embodiment, the signals from the strain gauge 38 are monitored to detect the presence or formation of cracks or erosion of the surface of the drive shaft 32 (or other components). Crack initiation and propagation can be monitored using strain gauges 38, which show an altered response when a crack is in close proximity. For example, in the case of a strain gauge including a resistive element sprayed onto a drive shaft, when the surface crack breaks through the resistive element, a resistance measuring circuit can detect the location and severity of the crack. When a crack crosses a few lines of the resistive element, the crack severity can be given by the number of open resistive legs (ie, an increase in overall resistance). The location of the crack can be given by the specific strength element, showing the strength variation.
    [0039] In one modality, the stress on the drive shaft or other component is monitored to monitor load, component fatigue and/or monitor component condition in relation to effective life components.
    [0040] For example, the load on the 32 drive shaft or other component is monitored and compared with pre-existing data, in relation to expected loads, conditions and service life. The drive shaft must undergo a certain amount of stress due to loading. Stress is measured and analyzed to monitor the number of load cycles experienced by a drive shaft and the effort/stress experienced during each load cycle. As operation proceeds in wells, processing unit 49 counts the number of load cycles through which tension is applied to the shaft. The number of load cycles is compared to a maximum or "safe" number of load cycles the drive shaft can safely support (which can be estimated based on the applied torque level). If the number of charge cycles exceeds the safety number or reaches a number related to the safety number, an alert can be sent to a user, or the processing unit 49 can automatically take a corrective action (eg stopping operation by reducing torque).
    [0041] Likewise, a maximum or safe level of voltage and/or torque applied to the drive shaft 32 during each load can be set, and the voltage is monitored during operation. If the voltage and/or torque exceeds the safe level or falls within a selected range around the safety level, an alert can be sent to a user and/or corrective action can be taken, for example, the torque applied to the drive shaft can be shortened.
    [0042] In one modality, the measured stress on a component (eg, axial stress, bending stress) is monitored and compared to the load stress or conditions that indicate an impending failure. These conditions can be predetermined based on previous operations or experimental observations. Such conditions include the number of load cycles and/or an amount of bending and twisting.
    [0043] In the fifth stage 65, various corrective or preventive measures are taken, in response to monitoring, for example, if the load conditions are determined to be detrimental to the proper functioning of the axle. For example, if crack propagation is detected, the downhole tool is pulled and the shaft or other component on which the crack has developed is replaced to prevent unmanaged well intervention. Other actions include sending an alert to a user or other controller, reducing torque or otherwise modifying operating parameters to compensate for monitoring conditions, and stopping downhole operation. The monitoring system can also activate self-healing systems to reduce/cure cracks through mechanical, chemical or electrical processes.
    [0044] The systems and methods described herein offer several advantages over prior art techniques. For example, the stress monitoring systems and methods described here provide the ability to perform real-time monitoring of stress loads on drive shafts and other components during downhole operation. Such monitoring provides the ability to detect and locate harmful conditions and quickly react to conditions such as behavior indicative of impending failure, component lifetime, as well as component erosion and crack development.
    [0045] In support of the precepts here, various analysis components can be used, including digital and/or analog systems. Digital and/or analog systems can be included, for example, in processing unit 49. Such systems can include components such as a processor, analog to digital converter, digital to analog converter, storage media, memory, input, output, communications link (wired, wireless, pulsed mud, optical or others), user interfaces, software programs, signal processors (digital or analog) and other such components (such as resistors, capacitors, inductors and others) to to provide for the operation and analysis of the apparatus and methods described herein in any of several ways well understood in the art. It is considered that these teachings can be, but need not be, implemented in conjunction with a set of computer-executable instructions stored on a computer-readable medium, including memory (ROM, RAM, USB flash drives, removable storage devices), optical (CD-ROM), or magnetic (floppy disks, hard disks), or any other type that, when executed, causes a computer to implement the method of the present invention. These instructions may provide for equipment operation, control, data collection and analysis, and other functions deemed relevant by a system designer, owner, user or others, in addition to the functions described in this invention.
    [0046] It will be recognized that the various components or technologies may provide some necessary or beneficial functionality or functionality. Accordingly, these functions and features, which may be necessary in support of the appended claims and variations thereof, are recognized as being inherently included as part of the teachings set forth herein and a part of the described invention.
    [0047] Although the invention has been described with reference to exemplary embodiments, it is to be understood that various modifications can be made and equivalents can be replaced by elements thereof without departing from the scope of the invention. In addition, many modifications will be appreciated in adapting a particular instrument, situation or material to the teachings of the invention without departing from the essential scope of the same. Therefore, it is intended that the invention is not to be limited to the particular embodiment described as the best-conceived mode of carrying out this invention, but that the invention includes all embodiments that fall within the scope of the appended claims.
    权利要求:
    Claims (11)
    [0001]
    1. Apparatus for measuring stress on a downhole component, characterized in that it comprises: at least one stress-sensitive device (38) disposed on a surface of a component of a downhole drilling assembly or disposed within a a material forming the component, at least one voltage sensitive device including a plurality of traces connected in parallel; and a processor (49) in operative communication with the at least one voltage sensitive device (38) in response to a component surface condition, the component surface condition including the formation of a surface crack or discontinuity, the processor configured to estimate crack formation and extent or surface discontinuity based on various conductive traces interrupted by the crack or surface discontinuity.
    [0002]
    2. Apparatus according to claim 1, characterized in that the component includes a drive shaft (32) configured to operatively connect a downhole motor to a drill.
    [0003]
    3. Apparatus according to claim 1, characterized in that the component includes at least one of a downhole motor, a drive shaft (32), a bearing assembly, a connector, and an area of the component that undergoes a concentration of stresses.
    [0004]
    4. Apparatus according to claim 1, characterized in that the at least one voltage-sensitive device (38) includes a material deposited on at least one surface of the component or within a layer of the surface.
    [0005]
    5. Apparatus according to claim 4, characterized in that the material includes at least one of an electrical conductor and a piezoelectric material.
    [0006]
    6. Apparatus according to claim 4, characterized in that the processor (49) is configured to detect at least one of erosion, crack formation and crack propagation, based on at least one of: a change in strength due to alteration or rupture of the material; and a change in acoustic wave transmission due to component surface modifications caused by at least one of erosion, crack formation and crack propagation.
    [0007]
    7. Apparatus according to claim 4, characterized in that the at least one voltage-sensitive device (38) includes an insulating layer disposed between the material and the component, the insulating layer made of a material that is at least as fragile as the component when in an operating environment.
    [0008]
    8. Method of monitoring a drilling operation, characterized in that it comprises: placing a drilling assembly in a well, the drilling assembly including at least one voltage-sensitive device disposed on or near a surface of a component of the downhole drilling assembly, or disposed within a material forming the component; perform a drilling operation; and detecting changes in the strain gauge during the drilling operation and analyzing the changes to monitor one or more loads on the component, and determine at least one magnitude of one or more loads and a series of load cycles experienced during the drilling operation ; and detect conditions that affect the drilling operation based on at least one magnitude and number of load cycles.
    [0009]
    9. Method according to claim 8, characterized in that the at least one tension-sensitive device includes a material deposited on at least one surface of the component or within a layer of the surface.
    [0010]
    10. Method according to claim 8, characterized in that the detection of conditions includes the detection of at least one of crack formation and crack propagation in the component close to the voltage-sensitive device by detecting a change in a signal from at least one voltage-sensitive device.
    [0011]
    11. Method for measuring stress in a downhole component, characterized in that it comprises: arranging a drilling assembly in a well, the drilling assembly including at least one stress-sensitive device deposited on the surface of a component of the piercing assembly or disposed within a material forming the component, the at least one voltage sensitive device including a plurality of trace conductors connected in parallel; detecting changes in at least one sensitive voltage in response to a component surface condition by a processor in operative communication with the at least one voltage sensitive device, the component surface condition including the formation of a surface crack or discontinuity; e estimate the crack formation and extent or surface discontinuity based on various conductive traces interrupted by the crack or surface discontinuity.
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    同族专利:
    公开号 | 公开日
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    BR112014020230A2|2017-06-20|
    NO20140916A1|2014-08-13|
    BR112014020230A8|2021-02-17|
    WO2013126396A1|2013-08-29|
    NO345168B1|2020-10-26|
    GB201416566D0|2014-11-05|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-02-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-13| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/02/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/401,158|US9057247B2|2012-02-21|2012-02-21|Measurement of downhole component stress and surface conditions|
    US13/401,158|2012-02-21|
    PCT/US2013/026845|WO2013126396A1|2012-02-21|2013-02-20|Measurement of downhole component stress and surface conditions|
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