WO2007127053A2 - Non-intrusive pressure gage - Google Patents
Non-intrusive pressure gage Download PDFInfo
- Publication number
- WO2007127053A2 WO2007127053A2 PCT/US2007/008890 US2007008890W WO2007127053A2 WO 2007127053 A2 WO2007127053 A2 WO 2007127053A2 US 2007008890 W US2007008890 W US 2007008890W WO 2007127053 A2 WO2007127053 A2 WO 2007127053A2
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- WIPO (PCT)
- Prior art keywords
- change
- radiation
- recited
- condition
- sensor system
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
- E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/08—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion
- F16H25/12—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for interconverting rotary motion and reciprocating motion with reciprocation along the axis of rotation, e.g. gearings with helical grooves and automatic reversal or cams
- F16H25/122—Gearings with helical grooves and automatic reversal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/04—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
Definitions
- the present invention relates to methods and apparatus for communicating information through a physical barrier, and, as a specific example, to a non-intrusive annulus pressure monitoring system.
- nested tubular members e.g., casing strings
- casing strings may extend for thousands of feet below the surface.
- These casing strings thus cooperate to define annular spaces; and it is often desirable to have information regarding the condition, such as the temperature or pressure, of these annular spaces.
- knowledge of a change in condition, such as a change in pressure or temperature, in such an annular space can indicate a loss of sealing integrity between the casing strings or the presence of unfavorable environmental conditions, provoking remedial responses by the operator, for instance.
- annulus monitoring techniques generally require a penetration (i.e., an intrusion) through the wall of one or more of the casing strings to, for example, communicate pressure by means of a hydraulic conduit to pressure monitoring equipment located outside of the annular region or to communicate information obtained by the monitoring equipment disposed in the annular region.
- a penetration i.e., an intrusion
- conventional techniques often require a port in the casing through which a communication cable from the monitoring equipment in the annular region extends.
- such monitoring equipment may require power from a cable that penetrates the casing string. Penetrations weaken the overall integrity of the given casing string, by providing potential points of leakage and structural weakness.
- the present invention provides methods and apparatus for communicating information through a physical barrier.
- a radioactive source may be placed on one side of the physical barrier, while a radiation detector is placed on the other side; Changes in detected radiation levels can be correlated to changes in condition of the side the source is on, the change being communicated to the detector on the opposite side non-intrusively.
- the present invention provides a sensor system for detecting a change in condition of an annular region, for instance.
- This exemplary system includes a radioactive source as well as at least one radiation detector configured to detect radiation from the source. Additionally, this system includes a displacement assembly that is configured to physically displace in response to the change in condition, such that the radiation levels detected are correspondingly changed as well.
- the radioactive source can be housed on a carrier that changes the position of the source relative to the detector in response to the change in condition.
- the displacement mechanism may displace the radioactive source in response to a change in the pressure of the annular region.
- this displacement is represented to a set of detectors — which are disposed on an opposite side of the given casing string from the source — as an increase or decrease in radiation levels.
- the detected radiation level can be correlated with a pressure level, providing a mechanism to quantify the change in pressure in the annular region, for instance.
- the relatively long half-life of the radioactive source allows for the continuous and non-intrusive communication of information for relatively long periods of time without the need for replacement or an external power source.
- the radioactive source can be of a lesser radioactivity, to accord with various environmental concerns.
- FIG. 1 is a isometric, section view of a non-intrusive monitoring system, in accordance with an exemplary embodiment of the present invention
- FIG. 2 is a section view of a non-intrusive monitoring device, in accordance with another exemplary embodiment of the present invention.
- FIG. 3 is a section view of a non-intrusive monitoring device, in accordance with another exemplary embodiment of the present invention.
- FIG. 4 is a section view of a non-intrusive monitoring device, in accordance with yet another exemplary embodiment of the present invention.
- FIG. 4a is a detail view of the device of FIG- 4 taken along arc 4a-4a of FIG. 4;
- FIG. 5 is a detail view of the non-intrusive monitoring device of FIG. 4, the device being illustrated in a first operating position;
- FIG. 6 is a detail view of the non-intrusive device of FIG. 4, the device being illustrated in a second operating position;
- FIG. 7 is an alternate section view of the device of FIG.4 in the operating position of FIG. 6;
- FIG. 8 is a section view of the device of FIG. 7 taken along line 8-8 of FIG. 7;
- FIG. 9 is a section view of a non-intrusive monitoring device, in accordance with yet another exemplary embodiment of the present invention.
- FIG. 10 is a schematic representation of a non-intrusive monitoring system, in accordance with an exemplary embodiment of the present invention.
- FIG. 11 is a schematic representation of a non-intrusive monitoring system, in accordance with an alternate, exemplary embodiment of the present invention.
- FIG. 12 is a cross-section of non-intrusive monitoring system disposed in an annular region between casing segments, in accordance with an exemplary embodiment of the present invention
- FIG. 13 is a cross-section and schematic view of a non-intrusive monitoring system disposed in a sealed fluid storage tank, in accordance with an exemplary embodiment of the present invention
- FIG. 14 is a cross-section and schematic view of a non-intrusive monitoring system disposed in a blow-out preventer (BOP) 5 in accordance with an exemplary embodiment of the present invention.
- BOP blow-out preventer
- FIG. 15 is a schematic illustration of a pipeline and pipeline pig, in accordance with an exemplary embodiment of the present invention.
- the present invention provides methods and apparatus for communicating information through a physical barrier in a non- intrusive manner.
- the present invention provides a non-intrusive monitoring system for an annular region between downhole casing strings, for instance.
- this monitoring can be effectuated by changing the position of a radioactive source disposed on one side of the casing string relative to detectors disposed on the other side, the change in position being the result of a change in pressure of the annular region, for instance.
- the change in pressure can be quantified.
- the change in detected radiation can be effectuated by positioning a radioactive shield that has varying levels of radioactive absorption at different portions, the shield's changing position in response to the change in pressure resultantly changing the detected radiation levels, for instance.
- FIG. 1 illustrates one exemplary embodiment of a non- intrusive monitoring system 10.
- the system 10 includes a radioactive source device 12 disposed inside an annular region 14 defined by a casing string 16 (illustrated in dash line).
- the system also includes at least one radiation detector 18, such as a Geiger-Mueller (GM) detector, scintillation crystals, or solid-state semiconductors, disposed on an opposite side of the casing string 16 from the source device 12.
- GM Geiger-Mueller
- the annular region 14 maybe, for example, the "A” or “B” annulus of a downhole casing string system, as will be appreciated by those of ordinary skill in the art in view of the present discussion.)
- Li operation radioactive particles emitted by the source device 12 pass through the casing string 16.
- information regarding the annular region 14 can be communicated non- intrusively.
- the illustrated shielding assembly 20 includes a shielding assembly 20 at least partially surrounding a radioactive source 22.
- the illustrated shielding assembly 20, in this embodiment, is a hollow piston defined by a base portion 24 and a skirt 26 extending from the base portion 24.
- the piston surrounds the source 22 on its top and sides.
- a radioactively absorbent material such as boron or cadmium or the like, limits the radioactive particles that reach the detector 18.
- the shielding assembly may be formed of any number of suitable materials.
- the source device 12 has a base ring 28 that receives the skirt 26 of the shielding assembly 20.
- the base ring 28 includes a recessed region 30 that is sized to receive the skirt 26.
- close dimensioning between the skirt 26 and the walls of the surrounding recessed region 30 prevents unwanted lateral movement of the shielding assembly 20, restricting it to axial movement only.
- the recessed region 30 also partially defines a raised floor 32 of the base ring 28.
- This raised floor 32 supports the radioactive source 22 on a mount 34, which may be integral with or mounted to the raised floor 32.
- the source 22 in turn, is secured to the top surface of the mount 34.
- a source retainer 36 which includes a chamber 38 contoured to match the shape of the mount 34, cooperates with the raised floor 32 to surround the mount 34 and secure it in place.
- the chamber 38 also cooperates with the mount 34 to define a cavity 40 within which the source 22 resides.
- the top 24, the skirt 26 and the source retainer 36 cooperate to define a cylindrical void 41, which contains a spring 42.
- This void 36 can be a vacuum or can be filled with a compressible fluid, for example.
- the inner peripheral surface of the skirt 26 abuts the outer peripheral surface of the source retainer 36, thus preventing lateral movement of the source retainer 36 and, through the interaction between the chamber 38 and the mount 34, preventing lateral movement of the source 22 as well.
- the source retainer 36 may be formed of a radioactively absorbent material, to prevent emission of undesired levels of radiation.
- the source device 12 includes a compression spring 42 that is confined by the inner surface of the skirt 26 and that acts against the top of the source retainer 36 and the base 24 of the shielding assembly 20.
- This compression spring 42 biases against axial movement of the shielding assembly 20 toward the base ring 28.
- the compression spring 42 may be secured to the base portion 24 and the top of the source retainer 36, to prevent axial separation of the open-bottom shielding assembly 20 from the remainder of the device 12.
- the source device 12 is designed to provide the radioactive particles from the source 22 a pathway of generally egress through aligned bores 44 in the base ring 28 and the source retainer 36 that are in or can be in communication with the cavity 40.
- the shielding assembly 20 also includes an aperture 46 in the skirt 26 that is configured to align with these bores 44; however, when the shielding assembly 20 is in its neutral state, due to the spring 42, the aperture 46 fails to align with the bores 44, thus substantially preventing the egress of radioactive particles from the cavity 40, into the bore 44 of the base ring 28, and, ultimately, into the annular region 14.
- the volume of compressible fluid in the cylindrical void 41 that houses the spring 42 begins to compress, better aligning the aperture 46 with the bores 44 and facilitating the egress of radioactive particles from the cavity 40 to the annular region 14.
- an increase of pressure within the annular region 14 exerts an axially compressive force on the volume of compressible fluid in the cylindrical void 39 that houses the spring 42 in the shielding assembly 20, overcoming the biasing force of the spring 42 and driving the shielding assembly 20 toward the base ring 28.
- the aperture 46 begins to align with the bores 44, it provides an enlarging pathway that places the annular region 14 in fluid communication with the cavity 40.
- the progressing alignment of the aperture 46 with the bores 44 places more and more of the cross-sectional area of the bores 44 in fluid communication with the cavity 40, with full alignment between the bores 44 and the aperture 46 occurring at maximum compression of the spring 42.
- the source device non-intrusively communicates information regarding a change in condition (i.e., a change in pressure) of the annular region 14 to the detector 18 outside the annular region 14 in a non-intrusive manner.
- this change in radiation levels detected by the detector 18 can be communicated to one or more processing devices, as discussed further below in relation to FIGS. 10 and 11, to calculate and quantify the change in condition of the annular environment 14.
- a low-strength radiation source such as a 10 ⁇ Currie Cs ⁇ ? source.
- Cesium ⁇ has a half-life of over 30 years.
- stronger radioactive sources such as Californium, a neutron source, could be employed.
- the present invention provides benefits not only to downhole applications but to any number of situations in which it is desired to communicate information through a physical barrier in a non-intrusive manner.
- the present device can be configured to detect changes in condition other than pressure.
- the spring 42 can be replaced with a thermally reactive (e.g., good thermal expansion) material that defines the position of the shielding assembly 20.
- the change in condition may be a change indicated by an electronic input signal or a mechanical switch.
- the change in condition may be a physical change in condition of an environment or a triggering event that is man-made, for example. It is envisaged that the change of condition described and claimed herein encompasses a wide variety of situations in a wide variety of applications.
- FIG. 2 illustrates an alternate, exemplary embodiment of the present invention.
- FIG. 2 illustrates an alternative embodiment of the source device 12.
- This source device 12 includes a base 28 from which extends a stem core 50.
- the stem core 50 extends through and supports a surrounding moveable bulkhead 52.
- the stem core 50 restricts movement of the bulkhead 52 to an axial direction generally parallel with the longitudinal axis of the stem core 50.
- the stem core 50 also supports an upper bulkhead 54; however, this upper bulkhead 54 is fixed in place with respect to the stem core 50.
- the exemplary source device 12 also includes flexible bellows 55 and 56, the upper bellows 56 extending from the upper bulkhead 54 to the moveable bulkhead 52 and the lower bellow 55 extending from the moveable bulkhead 52 to the base ring 28.
- Each of these bellows 55 and 56 surrounds the stem core 50 and, in cooperation with the appropriate bulkhead or base, defines a volume.
- the upper bellows 56 define a smaller volume 60 than the larger volume 62 of the lower bellows 55.
- this arrangement could be reversed in other embodiments.
- the bellows 55 and 56 maintain a compressible fluid within the volumes 60 and 62, respectively.
- the compressible fluid is introduced through inlets 68 and 70, which are in fluid communication with volumes 60 and 62, respectively. After the fluid is introduced, the volumes 60 and 62 are isolated from the external environment by sealing inlets 68 and 70. .
- the movable bulkhead 52 When placed into an annular region 14 of a casing string 16 assembly (see FIG. 1), the movable bulkhead 52 reacts to changes in the condition of this environment " .
- an increase in the pressure of the annular region 14 causes the moveable bulkhead 52, when taken with respect to the orientation of FIG. 2, to move to the left, as represented by directional arrow 63.
- increased pressure in the annular region 14 acts against the bellows and causes the fluid within volumes 60 and 62 to gravitate toward an equilibrium condition with the external pressure.
- the source device 12 takes advantage of the pressure-reactive displacement of the moveable bulkhead 52 to non-intrusively communicate the change in pressure.
- the moveable bulkhead 52 carries a shielding assembly 20 that surrounds that stem core 50 and that has a tapered profile.
- the tapered shielding assembly 20 interacts with a radioactive source 22 disposed in a cavity 65 within the stem core 50 to alter the level of radiation detected by the detector 18.
- the source device 12 communicates information indicative of the position of the shielding assembly 20 with respect to the radioactive source 22. And this information, which is collected by the radiation detector 18 disposed outside the annular region, is translated into quantifiable information regarding the annular region 14.
- the tapered profile of the shielding assembly 20 increases the thickness of radiation absorbing material in a path between the source 22 and the detector 18.
- the radioactively absorbent material that comprises the shielding assembly 20 generally does not prevent the passage of all radioactive particles. Rather, the number of radioactive particles that pass beyond the shielding assembly 20 is proportional to the thickness of the shielding assembly surrounding the source 22 at a given distance in a path between the source 22 and the detector 18. The thicker the shielding assembly 20 is with respect to this path, the fewer the radioactive particles that pass through, and, in turn, the lesser the radiation levels detected by the detector 18.
- the detected radiation levels are proportionally related to the displacement of the shielding assembly 20, and this displacement, in turn, is proportionally related to the change of condition within the annular region 14, i.e., the change in pressure of the annular region 14. Accordingly, in the embodiment of FIG. 2, an increase in pressure in the annular region 14 causes a decrease in the radiation levels detected by the detector 18, because of the tapered profile of the shielding assembly 20.
- FIG. 3 illustrates another exemplary embodiment of a source device 12; but in this device 12 the orientation of the shielding assembly 20 is reversed, thus increasing the radiation levels detected by the detector 18 in response to increased pressure in the annular region 14.
- the source device 12 of FIG. 3 also includes a placement pin 76 that facilitates insertion and setting of the radioactive source 22.
- the source device 12 of FIG. 3 has an extended portion 78 that extends from the base 28. Similar to the device 12 of FIG. 2, the extended portion includes inlet 70 that is in fluid communication with the interior region 62 of lower bellows 55. However, unlike the inlet of the FIG. 2 device, the inlet 70 of the FIG. 3 source device extends well into the stem core 50.
- This extended inlet 70 is thus configured to receive the placement pin 76, which supports the radioactive source 22 at one end.
- the placement pin 76 facilitates variable axial placement and mounting of the source 22 with respect to the shielding assembly 20 and the source device 12 as a whole.
- the inlet 70 may include threads that engage with corresponding threads on the placement pin 76, to secure and for adjustment of the placement pin 76.
- FIG. 4 illustrates yet another exemplary embodiment of a source device 12 in accordance with the present invention.
- this source device 12 translates rotational motion into linear displacement of the shielding assembly 20 with respect to the source 22.
- the inlet 70 in the base 28 feeds into the lower bellows 55 that define the lower interior region 62.
- the lower interior region 62 is filled with an incompressible fluid through inlet 70, which is subsequently plugged to isolate the lower interior region 62 from the annular region 14.
- the lower bellows 55 are secured to the base ring 28 and to a central portion 80 of the source device 12. Similar to the stem core 50, the central portion 80 includes a cavity 81 within which the radioactive source 22 resides. This central portion 80 also includes a channel 82 that is in fluid communication with the lower interior region 62 of the lower bellows 55. Through an inlet 84 in the central portion 80, this channel 82 is in fluid communication with the hollow interior 86 of a helical Bourdon tube 88 ⁇ see FIG. 4a). The Bourdon tube 88, which surrounds the central portion 80, is secured in place at one end to the central portion 80.
- the Bourdon tube 88 is secured to a camming assembly 90, which, as discussed further below, is free to rotate about the central portion 80 and effectuates axial displacement of the shielding assembly 20.
- the source device 12 may include a housing 92 that secures to the central portion 80 and that surrounds various components of the source device 12, to protect such components from the environment of the annular region 14.
- FIGS. 5 and 6 illustrate the mechanism for linear displacement of the shielding assembly 20.
- a compressive force is exerted on the flexible lower bellows 55 ⁇ see FIG. 4).
- the incompressible fluid therein energizes the Bourbon tube 88, causing rotation of the camming assembly 90 and advancing the shielding assembly 20 from the position of FIG. 5 to the position of FIG. 6.
- the camming assembly 90 surrounds an extended arm 96 of central portion 80 and is free to rotate about this arm 96. (As illustrated in dash line, the arm 96 includes a cavity 97 within which the source 22 resides.)
- the camming assembly 90 includes a helical channel 98 that cooperates with captured ball bearings 100 to effectuate the desired linear motion.
- the ball bearings 100 are confined by the helical channel 98, the extended arm 96, and arcuate notches 102 on the internal peripheral surface of the shielding assembly 20. This confinement is best illustrated in FIG. 8.
- the exemplary shielding assembly 20 has a tapered profile, thus altering the thickness of radiation absorbing material in a pathway from the source 22 to the detector 18 (see FIG. 4).
- a thinner part of the shielding assembly 20 is in the path between the source 22 and the detector 18 (see FIG. 4).
- a thicker part of the shielding assembly 20 rests in the path between the source 22 and the detector 18.
- the thickness of the radioactively absorbent material in such pathway is proportional to the radiation levels detected by the detector 18. Again, the greater the thickness of the material in the path between the detector 18 and the source 22, the lesser the radiation levels detected.
- the position of the shielding assembly 20 determines the level of radiation detected at detector 18. Any changes in the detected radiation level can be extrapolated to determine and quantify the change in the condition of the annular environment.
- the direction of the taper in the shielding assembly 20 can be reversed, such that an increase of pressure correlates to an increase in the detected radiation levels.
- the taper in the shielding assembly 20 need not be continuous, as is illustrated.
- the present invention is just as effective when the shielding assembly 20 presents a construction by which a first portion of the shielding assembly facilitates a greater transmission of radiation from the radioactive source at a given distance from the source than a second portion of the shield assembly at the given distance.
- the changes in transmission of radiation particles can be produced by altering thicknesses between the first and second portions, by altering the material of composition between the first and second portions, by providing apertures of varying size or shape between the first and second portions, as well as many other construction techniques that will be appreciated by those of ordinary skill in the art in view of the present discussion.
- the above-described source device 20 can be configured to react in response to any number of changes in condition — not just changes in pressure.
- rotation of the camming assembly 90 can be controlled by a thermally reactive coil ⁇ e.g., a bi-metallic strip), thus displacing the shielding assembly 20 in response to a change in temperature of the annular region 14.
- the position of the shielding assembly can be electrically controlled by a motor that responds to commands from a controller that receives a change in condition as an electronic input signal.
- the change in condition also can be a mechanical movement, whether automatically or manually trigged.
- FIG. 9 this figure illustrates an alternate, exemplary embodiment of the present invention in which a shielding assembly 20 is not employed. Rather, as is discussed in detail below in relation to FIG. 11, this system employs a positionable source 22 and a plurality of detectors 18, whereby displacement of source 22, as well as the underlying change in condition, is determined through differential comparison of the radiation levels detected by the plurality of detectors 18.
- the internal components are generally isolated from the environment of the annular region 14 by the housing 112. However, in the base of the housing 112, an inlet 114 that extends through housing and that is in fluid communication with a Bourdon tube 88 is provided. Thus, in this source device 12, the Bourdon tube 88 is exposed to the annular region 14 and, resultantly, energizes directly in response to a change in pressure of the annular region 14, for example. When energized, the Bourdon tube 88 effectuates rotation of a carriage 116 that is mechanically coupled to a shaft 118 via a pin assembly 120, for example. The shaft 118 is supported by roller bearings 122 that facilitate rotation of the shaft 118. Thus, rotation of the Bourdon tube 88 results in rotation of the shaft 118.
- the carriage 116 may include appropriate gears that amplify the rotation of the tube 88 to the shaft 118.
- the upper portion of the shaft 118 is surrounded by a stationary tube 124 that is supported by the housing 112.
- This tube 124 includes a helical channel 126 that, in cooperation with captured ball bearings 100, effectuate axial displacement of a carrier assembly 127.
- captured ball bearings 100 reside within axial recesses 125 in the shaft, and are confined by cooperation between an arcuate notch 129 in the carrier assembly 127 and the helical channel 126.
- the ball bearing rotates with the axial recess 125 and, in turn, reacts with the helical channel 126 to move the ball bearings 100 axially.
- this axial displacement of the ball bearings 100 also causes an axial displacement of the carrier assembly 127.
- the carrier assembly 127 maintains the radioactive source 22.
- displacement of carrier assembly 127 results in a displacement of the source 22 as well.
- displacement of the source 22 indicates a change in the condition of the annular region, e.g., a change in the pressure of the annular region. This differential comparison is further discussed in relation to Fig. 11.
- FIG. 10 illustrates in schematic form an exemplary system that has a source device 12 that effectuates changes in the detected radiation levels through the shielding assembly, like the source devices of FIGS. 1-8. These devices 12 facilitate detection of the change in pressure through the use of a single detector 18, although a plurality of detectors may be employed.
- the detector of FIG. 10 is a GM detector that has a measurement window 140 and anode and cathode components, 142 and 144, respectively.
- the anode 142 receives its operating power for the detector 18 from a high-voltage power source 146; and the cathode 144 is coupled to an operational amplifier 148 that is, in turn, electrically coupled to a Schmitt trigger 150.
- a processing device 152 such as a microprocessor, a logic circuit, or a state device, among other devices, receives input from the Schmitt trigger 150.
- the processing device 152 is in communication with a controller 154, which may include user input and output devices and may be located downhole or at the surface.
- the processing device 152 and/or the controller 154 may include memory components that quantify the change in condition of the annular region 14 via stored correlative data or formulaic relationships, for instance.
- FIG. 11 illustrates a differential sensor system that employs two or detectors.
- the source 22 is configured to displace in response to a change in condition of the annular region 14.
- the exemplary system 10 a plurality of detector 18.
- the detectors 18 are electrically arranged like the detector 18 of FIG. 10.
- the processing device 152 has two inputs, one from each of the detectors 18.
- the processing device 152 is configured to compare the detected levels of radiation from the individual detectors to determine the position of the source and, in turn, to quantify the change in condition in the annular region.
- the source 22 With respect to the orientation of FIG. 11, if the source 22 is displaced downwardly, it moves closer to the lower detector 18 and further from the upper detector 18. This movement increases the levels of radiation detected by the lower detector 18 while decreasing the levels of radiation detected by the upper detector. Moreover, the greater the increase of radiation detected lower detector (and the greater the decrease of radiation detected by the upper detector), the greater the displacement of the source 22. Because displacement of the source is proportional to the change in condition, a comparison of the changes in detected radiation levels provides a quantifiable representation of the change in the condition. And if the source 22 were to move upwardly, the upper detector 18 would see an increase in radiation levels whilst the lower detector would see a decrease, the increase and decrease being proportional to the amount of displacement of the source.
- the system 10 is not a susceptible to background radiation or changes in such background radiation. For instance, if the production fluid produced by the downhole well bore were to have radioactive particle, these particles would increase the background radiation in the annular environment 14. However, this increase would, it is believed, affect equally the detectors, causing in equal rise in detected radiation levels. Thus, displacement of the source still produces a relative increase in one detector 18 and a relative decrease in the other detector, providing a mechanism for determining the direction and magnitude of the source's 22 displacement.
- FIG. 12 this figure illustrates and exemplary system 10 disposed in a downhole casing string assembly.
- the detector 18 is disposed in the "A" annulus 162 of the string assembly, while the source device 12 is disposed in the "B" annulus 160.
- the source device 12 and the detector obviously, are on opposite sides of the casing string 16.
- This string 16 may serve as a support structure for the source device 12 and/or the detector 18.
- the exemplary system 10 includes an EMF (Electric Magnetic Field) power source.
- This EMF power source comprises a wound coil 164 that circumscribes the production tubular 166.
- This wound coil 164 acts as the primary coil of an air-core transformer.
- the system also includes a secondary coil (not shown) disposed in the power source 146 of the detector 18 (see FIGS. 10 and 11).
- a secondary coil (not shown) disposed in the power source 146 of the detector 18 (see FIGS. 10 and 11).
- an induced high-voltage current sufficient to operate the detectors, can be provided through the secondary coil.
- the primary coil can receive EMF feedback from the secondary coil, to communicate to the coil the detected levels of radiation, for instance.
- the present invention can provide benefits for determining the liquid level within a sealed container.
- the source device 12 of FIG. 13 includes a floatation assembly 170 that carries source 22, the positions of which are defined by the level of fluid 172 in the sealed container 174.
- the flotation assembly 170 which is coupled in a sliding manner to channel 176, correspondingly displaces.
- this displacement is communicated to the plurality of detectors 18 (a single detector can be employed as well) disposed outside the container 172 in the form of changed radiation levels. Again, these changes in radiation levels provide a mechanism through which the displacement and corresponding change in fluid level can be quantified.
- FIG. 14 illustrates yet another exemplary embodiment of the present invention.
- the radioactive source 22 elements are located on the rams 180 of a blow-out preventer 182 (BOP).
- BOP blow-out preventer
- BOP's are employed to seal a downhole bore in the event of excess wellbore pressure, for instance. This sealing is effectuated by driving the rams 180 into engagement with one another.
- the sealing ability of the rams 180 can deteriorate.
- the level of deterioration and, thus, sealing ability is believe to correlate with the required ram stroke (i.e., displacement of the rams 180) to achieve wellbore closure.
- an accurate shear ram stroke measurement is believed to provide information regarding the remaining BOP life and the confidence in the BOP's future operations.
- the source 22 is placed on or inside each of the rams 180.
- the change of position of the rams 180 can be determined.
- Knowledge of the displacement needed for metal-to- metal contact of the rams 180 is believed to indicate BOP integrity, with a greater ram stroke correlating with decreased BOP integrity.
- packer material of the BOP is abraded, extruded, or otherwise degraded during well operation or by repeated BOP function testing, the remaining packer life, it is believed, can be estimated.
- This approach is superior to one in which testing only provides evidence that there was adequate packer life to effectuate a seal the last time the BOP was operated or tested.
- the above technique provides a forward-looking estistame of BOP integrity, rather than the present tests which only determine that integrity of the BOP was adequate at, and only at, the time of the test.
- FIG. 15 illustrates data communication through a steel barrier utilizing modulated nuclear flux.
- a pipeline pig 190 could be equipped with a radiation 22 source held in a source 12, which are discussed above.
- radiation escapes the shielded container or, alternatively, be blocked from escaping.
- the pig 190 is briefly captured and held stationary in the proximity of a detector 18 that may be in the pipeline 192 or external to the pipeline 192.
- the pig 190 may then relay its status or other information pertinent to its specific purpose to the detector by operating the aperture on the source device 12 in a coded sequence manner.
- the aperture 46 (see FIG. 1) could be operated in an alternating ⁇ i.e., open/close pattern) to, in essence, transmit bits of information.
- An open aperture 46 might, for example, represent a logic one, while a closed aperture would represent a logic zero.
- an arbitrary length digital message could be conveyed through the wall of the pipeline 192 without need to penetrate the pipeline wall.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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GB0820706A GB2451383B (en) | 2006-04-28 | 2007-04-10 | Non-intrusive pressure gage |
NO20084585A NO342843B1 (en) | 2006-04-28 | 2008-11-03 | Sensor system and method for detecting a change in state in an annulus in a well |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/414,037 US7599469B2 (en) | 2006-04-28 | 2006-04-28 | Non-intrusive pressure gage |
US11/414,037 | 2006-04-28 |
Publications (2)
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WO2007127053A2 true WO2007127053A2 (en) | 2007-11-08 |
WO2007127053A3 WO2007127053A3 (en) | 2008-12-24 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/008890 WO2007127053A2 (en) | 2006-04-28 | 2007-04-10 | Non-intrusive pressure gage |
Country Status (4)
Country | Link |
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US (1) | US7599469B2 (en) |
GB (2) | GB2478216B (en) |
NO (1) | NO342843B1 (en) |
WO (1) | WO2007127053A2 (en) |
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CN105081749A (en) * | 2015-08-10 | 2015-11-25 | 成都亨通兆业精密机械有限公司 | External perforating method for sensor |
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CN104548370B (en) * | 2014-12-16 | 2017-04-26 | 中国人民解放军第三军医大学第一附属医院 | Safe radioactive box and multi-source concentric radiotherapy machine |
CN104548369B (en) * | 2014-12-16 | 2017-02-22 | 重庆市九龙坡区中医院 | Servo motor driven safe radiation box |
CN104548389B (en) * | 2014-12-16 | 2017-11-10 | 重庆市九龙坡区中医院 | A kind of electromagnetic drive radiates safely box |
CN106482691B (en) * | 2016-11-23 | 2018-09-14 | 华南理工大学 | A kind of real-time apparatus and method for measuring shaft spatial pose |
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Also Published As
Publication number | Publication date |
---|---|
GB201107942D0 (en) | 2011-06-22 |
GB2451383B (en) | 2011-11-09 |
GB2451383A (en) | 2009-01-28 |
GB2478216A (en) | 2011-08-31 |
US20070251688A1 (en) | 2007-11-01 |
NO342843B1 (en) | 2018-08-13 |
GB0820706D0 (en) | 2008-12-17 |
GB2478216B (en) | 2011-10-19 |
US7599469B2 (en) | 2009-10-06 |
NO20084585L (en) | 2008-11-27 |
WO2007127053A3 (en) | 2008-12-24 |
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