Pulse neutron dynamic saturation element monitor

Abstract

The invention relates to the technical field of oil reservoir monitoring, and discloses a pulsed neutron dynamic saturation element monitor which comprises a detection rod, the detection rod is sleeved with a centralizer, the centralizer comprises a first lantern ring, a second lantern ring and an elastic piece, the outer wall of the detection rod is sleeved with the first lantern ring and the second lantern ring, the first lantern ring is connected to the upper end of the elastic piece, and the second lantern ring is connected to the lower end of the elastic piece. The lower end is slidably connected to the second lantern ring; when the elastic piece makes contact with a protruding block protruding on the well wall in the descending process, the whole elastic piece is bent towards the side away from the protruding block under the abutting action of the protruding block, the lower end of the elastic piece slides on the second lantern ring, the elastic piece crosses the protruding block after contracting, and the elastic piece is fixed to the well wall through deformation of the elastic piece and sliding of the lower end. The centralizer can smoothly cross the protruding block on the well wall, the situation that the centralizer and the detection rod are clamped in a well due to the protruding block on the well wall is avoided, and the detection rod can smoothly conduct subsequent detection.

Description

Technical Field

[0001] This invention relates to the field of reservoir monitoring technology, specifically to a pulsed neutron dynamic saturation element monitor. Background Technology

[0002] Existing pulsed neutron dynamic saturation element monitoring instruments are equipped with neutron generators, gamma-ray detectors, and multiple other detectors. When the instrument extends downhole, it emits pulsed high-energy neutrons into the formation. The neutrons undergo inelastic scattering and thermal neutron capture with the formation atomic nuclei. The detectors use time-gated technology to separate and collect the inelastic scattering gamma spectrum and the captured gamma spectrum. The spectrum is analyzed to extract the count rate or ratio of key element characteristic peaks. The element ratio is then converted into oil saturation (So) and water saturation (Sw) to determine water salinity and distinguish fluid types. Furthermore, by performing time-lapse measurements at fixed locations and comparing the saturation calculation results at different times, the dynamic changes in reservoir fluid saturation are monitored.

[0003] For example, patent CN211422629U, published on September 4, 2020, discloses a downhole reservoir monitoring instrument, relating to the technical field of stratification monitoring and control devices in oilfield production. It includes an upper connector, a circuit board, a pressure sensor, a lower connector, a resistivity tomography device, a power supply unit, a data acquisition and control unit, a conduit, threads, a well casing, and a production pipe. The upper connector is located at the upper end of the production pipe, and the lower connector is located at the lower end of the production pipe. The production pipe is connected to the upper and lower connectors via threads. A conduit is located on one edge of the production pipe, and a circuit board is located on the other edge. The pressure sensor is fixed to the bottom of the upper connector and electrically connected to the circuit board via the conduit. The well casing is fitted over the production pipe and spaced apart from it. A resistivity tomography device is located on the side of the upper connector. The resistivity tomography device is connected to the power supply unit and the data acquisition and control unit located on the surface via data lines and cables, used to transmit the data collected by the resistivity tomography device to the data acquisition and control unit on the surface for analysis.

[0004] In existing downhole monitoring instruments, the instrument is suspended by a cable and descends at a constant speed by controlling the cable. Since the instrument monitors reservoir saturation by utilizing the interaction between neutrons and formation atomic nuclei (such as neutron capture and inelastic scattering) and receiving formation response signals through a gamma-ray detector, eccentricity can lead to neutron flux distortion and gamma-ray detection inaccuracies. Therefore, current technology incorporates a centralizer to keep the instrument centered within the well. However, most existing centralizers are fixed designs, such as casing-type elastic centralizers and rigid spiral centralizers. These centralizers remain flush with the wellbore wall during downhole movement. When they encounter protrusions on the wellbore, they are prone to jamming, preventing further descent and impacting subsequent downhole monitoring. Summary of the Invention

[0005] The purpose of this invention is to provide a pulsed neutron dynamic saturation element monitor to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pulsed neutron dynamic saturation element monitor, comprising a detection rod, a centralizer sleeved on the detection rod, the centralizer comprising a first collar, a second collar, and an elastic plate, the first collar and the second collar both being sleeved on the outer wall of the detection rod, the upper end of the elastic plate being connected to the first collar, and the lower end being slidably connected to the second collar.

[0007] In a preferred embodiment of the present invention, the outer wall of the second ring is provided with a first sliding groove, a first slider is provided in the first sliding groove, the first slider and the first sliding groove form a sliding guide fit, and the lower end of the elastic sheet is connected to the first slider.

[0008] In a preferred embodiment of the present invention, a one-way mechanism is provided in the first slide groove. The one-way mechanism cooperates with the first slider to limit its reset and rise after the first slider descends.

[0009] In a preferred embodiment of the present invention, the one-way mechanism includes a wedge and a spring. A receiving groove is radially opened in the first sliding groove. The wedge is inside the receiving groove and forms a sliding guide engagement with the receiving groove. The wedge is dynamically sealed to the groove wall of the receiving groove. One end of the spring is connected to the wedge and the other end is connected to the groove wall of the receiving groove.

[0010] In an embodiment of the present invention, preferably, a groove is provided on the side of the first slider near the central axis of the second ring, and the first slider is initially located above the wedge and is spaced apart from the wedge.

[0011] In a preferred embodiment of the present invention, the second ring is slidably connected to the detection rod, and a driving assembly is installed inside the detection rod. The driving assembly is used to drive the second ring to move vertically up and down on the detection rod. A limiting groove is formed on the inner wall of the second ring, and one end of the second slider is located in the limiting groove and forms a limiting abutment cooperation with the limiting groove.

[0012] In a preferred embodiment of the present invention, the outer wall of the detection rod is provided with a second sliding groove, a second slider is installed in the second sliding groove, the second slider and the second sliding groove form a sliding guide fit, a sealing plate is provided inside the detection rod, one end of the second slider is connected to the sealing plate, the sealing plate is dynamically sealed to the inner wall of the detection rod, the drive assembly is connected to the sealing plate, and the drive assembly is fixedly installed on the inner wall of the detection rod.

[0013] In a preferred embodiment of the invention, the second ring includes an inner ring and an outer ring, wherein the inner ring is used to lock the one-way mechanism during the ascent.

[0014] In a preferred embodiment of the present invention, a limiting groove is formed on the outer wall of the inner ring, the inner ring is slidably connected to the outer ring, the first slider and the first sliding groove are located on the outer ring, a through hole is formed inside the inner ring, the through hole corresponds to the receiving groove, and the wedge block is dynamically sealed to the groove wall of the receiving groove.

[0015] In a preferred embodiment of the present invention, the inner wall of the outer ring is provided with a guide groove, and the side wall of the inner ring near the outer ring is provided with a guide block. One end of the guide block is located in the guide groove and forms a sliding guide engagement with the guide groove.

[0016] The beneficial effects of the present invention are as follows: In the above technical solution, when the elastic sheet of the present invention contacts the protrusion on the well wall during the descent process, due to the sliding arrangement of the lower end of the elastic sheet, the elastic sheet bends as a whole away from the protrusion under the contact of the protrusion, and the lower end of the elastic sheet slides on the second ring, so that the arc-shaped elastic sheet is radially bent and contracted. At this time, the distance between the two ends of the elastic sheet is lengthened, and the distance between the middle part and the central axis of the detection rod is shortened. After the elastic sheet contracts, it passes over the protrusion. Through the deformation of the elastic sheet and the sliding of the lower end, the stabilizer can smoothly pass over the protrusion on the well wall, avoiding the protrusion on the well wall from causing the stabilizer and the detection rod to be stuck in the well, so that the detection rod can smoothly carry out subsequent detection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1This is a schematic diagram of the structure provided for an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the centralizer structure provided in an embodiment of the present invention;

[0020] Figure 3 Provided for embodiments of the present invention Figure 2 Enlarged view of point A in the image;

[0021] Figure 4 This is a front sectional view of the detection rod provided in an embodiment of the present invention;

[0022] Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged view of point B in the image;

[0023] Figure 6 This is a side cross-sectional view of the detection rod provided in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Detection rod; 11. Remote transmission section; 12. Acquisition generator section; 13. Lifting lug; 14. Second slider; 15. Second slide groove; 16. Sealing plate; 17. Drive assembly; 2. Centralizer; 21. First collar; 22. Second collar; 221. First slide groove; 222. First slider; 223. Groove; 224. Inner ring; 225. Outer ring; 226. Perforation; 227. Limiting groove; 228. Guide groove; 229. Guide block; 23. Elastic sheet; 3. One-way mechanism; 31. Wedge block; 32. Receiving groove; 33. Spring. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figure 1-6 As shown, this embodiment of the invention provides a pulsed neutron dynamic saturation element monitor, including a detection rod 1, a centralizer 2 sleeved on the detection rod 1, the centralizer 2 including a first collar 21, a second collar 22 and an elastic sheet 23, the first collar 21 and the second collar 22 are both sleeved on the outer wall of the detection rod 1, the upper end of the elastic sheet 23 is connected to the first collar 21, and the lower end is slidably connected to the second collar 22.

[0029] Specifically, the detection rod 1 includes a remote transmission section 11 and a data acquisition generator section 12 connected to each other. The upper end of the data acquisition generator section 12 is fixedly connected to the lower end of the remote transmission section 11. The upper end of the remote transmission section 11 is mounted on a lifting lug 13, and the cable is secured to the lifting lug 13. The cable suspending the detection rod 1 extends into the remote transmission section 11 and connects to it. The remote transmission section 11 encodes and transmits the data acquired by the data acquisition generator to the ground via the cable. The data acquisition generator includes a detection mechanism, which can be a gamma detector, a neutron detector, or a temperature or pressure detector. The sensor and detection mechanism are used to acquire formation physical response signals in real time. The remote transmission short circuit and the acquisition generator short circuit are common components in pulsed neutron dynamic saturation element monitors and are existing technologies, so they will not be elaborated upon. Two sets of centralizers 2 are installed at the upper and lower ends of the detection rod 1, respectively, on the remote transmission short section 11 and the acquisition generator short section 12. The centralizers 2 are detachably connected to the detection rod 1. Each set of centralizers 2 has four sets of elastic plates 23, which have an arc-shaped structure. The first ring 21 and the second ring 22 are composed of two sets of U-shaped connecting plates, such as... Figure 2As shown, the connecting pieces have screw holes at both ends. In actual use, before the detection rod 1 is inserted into the well, the centralizer 2 needs to be installed on the detection rod 1. This involves attaching the two sets of connecting pieces that make up the first and second casings to the outer wall of the detection rod 1. Then, the two sets of opposing connecting pieces are connected by bolts, forming the first and second rings 21 and fitting onto the detection rod 1. At this point, the centralizer 2 is successfully installed on the detection rod 1. When the detection rod 1 is inserted into the well, the centralizer 2 extends into the well synchronously. The elastic plates 23 in the centralizer 2 contact the well wall. The multiple sets of elastic plates 23 correct the detection rod 1 to the center position of the well, improving the accuracy of data acquisition from the data acquisition generator section 12 in the detection rod 1. Secondly, during the descent of the detection rod 1 and the stabilizer 2, when the elastic plate 23 contacts the protrusion on the well wall during descent, due to the sliding setting of the lower end of the elastic plate 23, the elastic plate 23 bends towards the side away from the protrusion under the contact of the protrusion. The lower end of the elastic plate 23 slides on the second ring 22, so that the arc-shaped elastic plate 23 is radially bent and contracted. At this time, the distance between the two ends of the elastic plate 23 is lengthened, and the distance between the middle part and the central axis of the detection rod 1 is shortened. After contraction, the elastic plate 23 passes over the protrusion. Through the deformation of the elastic plate 23 and the sliding of the lower end, the stabilizer 2 can smoothly pass over the protrusion on the well wall, avoiding the protrusion on the well wall from causing the stabilizer 2 and the detection rod 1 to be stuck in the well, so that the detection rod 1 can smoothly carry out subsequent detection.

[0030] Furthermore, the outer wall of the second ring 22 is provided with a first groove 221, and a first slider 222 is provided in the first groove 221. The first slider 222 and the first groove 221 form a sliding guide fit. The lower end of the elastic piece 23 is connected to the first slider 222. Both the first slider 222 and the first slider 222 are T-shaped. The length direction of the first slider 222 and the groove direction of the first groove 221 are consistent with the axial direction of the second ring 22. In actual use, when the middle part of the elastic piece 23 is abutted by a protrusion on the well wall, the lower end of the elastic piece 23 pushes the first slider 222 to slide in the first groove 221. 2. The lower end of the sliding adaptation elastic sheet 23 slides within the first slide groove 221. Then, after the elastic sheet 23 passes the protrusion, the elastic sheet 23 itself begins to reset and drives the first slider 222 to reset and slide within the first slide groove 221. Furthermore, in another embodiment of the present invention, the lower end of the elastic sheet 23 is rotatably connected to the first slider 222. That is, when the first slider 222 slides within the first slide groove 221, the lower end of the elastic sheet 23 will rotate adaptively on the first slider 222, thus avoiding the first slider 222 being stuck in the first slide groove 221 due to the stretching and descent of the lower end of the elastic sheet 23 when the elastic sheet 23 is fixedly connected to the first slider 222.

[0031] In the prior art, due to the combined influence of geological conditions, engineering design, and operation process, oil wells may have varying diameters. That is, when the detection rod 1 and the stabilizer 2 descend vertically in the oil well, they may move from a wider part of the oil well to a narrower part. Although in the above embodiment, the diameter of the stabilizer 2 can be reduced by the deformation of the elastic sheet 23, allowing the stabilizer 2 to enter the narrower oil well, the elastic force of the elastic sheet 23 itself, i.e., the reset of the elastic sheet 23 after deformation, will increase the friction between the stabilizer 2 and the oil well wall. As the friction increases, the stabilizer 2 and the detection rod 1 may get stuck in the narrower part of the oil well, thus preventing the detection rod 1 from continuing to descend for detection. Therefore, in another embodiment of the present invention, a one-way mechanism 3 is further provided in the first slide groove 221. The one-way mechanism 3 cooperates with the first slider 222 to restrict its reset and rise after the first slider 222 descends.

[0032] Specifically, based on the above embodiments, the descent of the lower end of the elastic plate 23 will cause the first slider 222 to descend synchronously within the first groove 221. Similarly, when the elastic plate 23 resets under its own elastic force, the reset and rise of the lower end of the elastic plate 23 will also cause the first slider 222 to rise within the first groove 221. In actual use, when the centralizer 2 and the detection rod 1 descend from the wider part to the narrower part of the oil well, the elastic plate 23 will be forced to contract radially with the radial direction of the oil well. At this time, the first slider 222 slides within the first groove 221. At this time, due to the setting of the one-way mechanism 3, after the first slider 222 descends within the first groove 221, the first slider 222 is restricted by the one-way mechanism 3 and cannot reset and rise. That is, the elastic plate 23 cannot be radially stretched, that is, the elastic plate 23 cannot reset. The elastic plate 23 cannot use its own elastic force to increase the friction between itself and the oil well wall during radial contraction, thereby reducing the situation where the centralizer 2 and the detection rod 1 are stuck in the narrower part of the oil well after the elastic plate 23 is deformed.

[0033] In an optional embodiment, preferably, the one-way mechanism 3 includes a wedge 31 and a spring 33. A receiving groove 32 is radially opened in the first sliding groove 221. The wedge 31 is inside the receiving groove 32 and forms a sliding guide fit with the receiving groove 32. The wedge 31 is dynamically sealed to the groove wall of the receiving groove 32. One end of the spring 33 is connected to the wedge 31 and the other end is connected to the groove wall of the receiving groove 32.

[0034] Specifically, a groove 223 is provided on the side of the first slider 222 near the central axis of the second ring 22. The first slider 222 is initially positioned above the wedge 31 and is spaced apart from the wedge 31. This spacing ensures that the elastic plate 23 will not contact the wedge 31 when it undergoes small deformation in the face of the protrusion. When the stabilizer 2 and the detection rod 1 move to a narrower part of the oil well, the stabilizer 2 is compressed radially by the well wall, i.e., the elastic plate 23 contracts radially. The lower end of the elastic plate 23 drives the first slider 222 to slide in the first groove 221. When the first slider 222 descends to a certain extent, it contacts the inclined surface of the wedge and forms a wedge-shaped fit with the wedge 31. The descent of the first slider 222 squeezes the wedge 31 into the receiving groove 32. After the lower end of the first slider 222 passes the wedge 31, the groove 223 on the back of the first slider 222... 3. Move to the opening of the receiving groove 32. At this time, the wedge 31 loses the resistance of the first slider 222. The spring 33 begins to reset and pushes the wedge 31 out of the receiving groove 32. At this time, one end of the wedge 31 enters the groove 223. At this time, the lower groove wall of the groove 223 and the vertical surface of the wedge 31 form abutment. Under this abutment, the first slider 222 cannot slide in the first slide groove 221. That is, the lower end of the elastic plate 23 cannot reset and rise. The elastic plate 23 as a whole cannot reset after deformation. That is, the elastic plate 23 will not give the well wall additional squeezing force, thereby reducing the friction between the elastic plate 23 and the well wall, reducing the situation where the centralizer 2 and the detection rod 1 are stuck in the well. In this embodiment, multiple sets of wedges 31 are provided. Multiple sets of wedges 31 are equidistantly distributed along the groove direction of the first slide groove 221. Multiple sets of wedges 31 correspond to different heights of the descent of the first slider 222, that is, corresponding to the centralizer 2 entering oil wells of different diameters.

[0035] In another embodiment of the present invention, in the first slide groove 221, the second collar 22 is slidably connected to the detection rod 1, and the detection rod 1 is equipped with a drive assembly 17, which is used to drive the second collar 22 to move vertically up and down on the detection rod 1.

[0036] Specifically, a second groove 15 is formed on the outer wall of the detection rod 1, and a second slider 14 is installed in the second groove 15. The second slider 14 and the second groove 15 form a sliding guide fit. A sealing plate 16 is provided inside the detection rod 1. One end of the second slider 14 is connected to the sealing plate 16. The sealing plate 16 is dynamically sealed to the inner wall of the detection rod 1. The drive assembly 17 is connected to the sealing plate 16. The length and width of the sealing plate 16 are both greater than the width and length of the second groove 15. The sealing plate 16 can be positioned within the second groove 15 of the second slider 14. During the sliding process, the opening on the side of the second slide groove 15 closest to the central axis of the detection rod 1 is always blocked to prevent liquids, particles, etc. from entering the detection rod 1 through the second slide groove 15, thus avoiding damage to the various components inside the detection rod 1. The drive assembly 17 is fixedly installed on the inner wall of the detection rod 1. The drive assembly 17 can be a linear drive mechanism such as an electric push rod or a cylinder. A limit groove 227 is opened on the inner wall of the second collar 22. One end of the second slider 14 is located in the limit groove 227 and forms a limit abutment cooperation with the limit groove 227.

[0037] In actual use, during the installation of the second collar 22, the two connecting pieces that make up the second collar 22 are respectively installed on the two second sliders 14 on the detection rod 1, so that one end of the second slider 14 enters the limiting groove 227. After the two connecting pieces are connected by bolts to form the second collar 22, the second collar 22 is installed on the detection rod 1 through the second slider 14. The inner wall of the second collar 22 does not directly contact the outer wall of the detection rod 1, but there is a certain distance between them. Therefore, when the drive mechanism drives the second slider 14 to slide and rise in the second slide groove 15 through the sealing plate 16, the sliding of the second slider 14 can smoothly drive the lower end of the elastic plate 23 to rise synchronously. As the lower end of the elastic plate 23 actively rises, the elastic plate 23 opens... Initially, the elastic sheet 23 is stretched radially, gradually bending, with its middle part moving towards the well wall. At this time, the deformation of the four sets of elastic sheets 23 simultaneously applies pressure to the well wall, providing friction between the elastic sheet 23 and the well wall. The deformation of the elastic sheet 23 limits and supports the detection rod 1 in the well. When the detection rod 1 detects an abnormality in a certain section of the well, such as a sudden change in saturation or a sudden increase in water content during the monitoring process, the detection rod 1 can be temporarily fixed in the well by the deformation of the elastic sheet 23. After monitoring, the drive component 17 drives the second slider 14 to reset and move, and drives the elastic sheet 23 to reset and move. At this time, after the elastic sheet 23 resets, it loses the pressure on the well wall, and the entire centralizer 2 and the detection rod 1 can continue to descend in the well.

[0038] In order to prevent the one-way mechanism 3 from affecting the rise of the lower end of the elastic plate 23 driven by the second ring 22, in this embodiment, the second ring 22 further includes an inner ring 224 and an outer ring 225. The inner ring 224 is used to lock the one-way mechanism 3 during the rising process.

[0039] Specifically, a limiting groove 227 is formed on the outer wall of the inner ring 224, which is slidably connected to the outer ring 225. The first slider 222 and the first sliding groove 221 are located on the outer ring 225. A through hole 226 is formed inside the inner ring 224, which corresponds to the receiving groove 32. The wedge 31 is dynamically sealed to the groove wall of the receiving groove 32, that is, the outer wall of the wedge 31 is provided with a sealing ring. The wedge 31 forms a dynamic seal connection with the receiving groove 32 through the sealing ring. By setting the dynamic seal, liquid and particles in the well can be prevented from entering the receiving groove 32, thereby affecting the movement of the wedge 31 in the receiving groove 32.

[0040] In the initial state, that is, when the second slider 14 has not yet slid in the second slide groove 15, the through hole 226 is connected to the receiving groove 32. At this time, when the first slider 222 slides in the first slide groove 221, the contact between the first slider 222 and the wedge 31 will force the wedge 31 to retract into the receiving groove 32. The inner wall of the outer ring 225 is provided with a guide groove 228, and the inner ring 224 is provided with a guide block 229 on the side wall near the outer ring 225. One end of the guide block 229 is located in the guide groove 228 and forms a sliding guide engagement with the guide groove 228. The guide block 229 is initially located at the lower end of the guide groove 228.

[0041] When the drive assembly 17 drives the second slider 14 to slide within the second slide groove 15, the rise of the second slider 14 causes the inner ring 224 to rise, while the outer ring 225 remains stationary under the support of the elastic sheet 23. At this time, the inner ring 224 and the outer ring 225 move relative to each other. The inner ring 224 slides on the outer ring 225, and the guide block 229 on the inner ring 224 slides and rises within the guide groove 228 of the outer ring 225 until the guide block 229 moves from the lower end of the guide groove 228 to the upper end of the guide groove 228. The block cannot continue to slide within the guide groove 228. Simultaneously, the perforation 226 and the receiving groove 32 are misaligned. The plate portion of the inner ring 224 moves to the end of the receiving groove 32 away from the wedge block 31. That is, the moved inner ring 224 blocks the end of the receiving groove 32 away from the wedge block 31. As the wedge block 31 moves into the receiving groove 32 and compresses the space within it, the dynamic seal between the wedge block 31 and the receiving groove 32 prevents air from flowing out of the blocked receiving groove 32 as the wedge block 31 moves. With one end open for discharge, the wedge 31 cannot slide within itself at this time, meaning the one-way mechanism 3 is locked. During the subsequent continuous rise of the second slider 14, the inner ring 224 drives the outer ring 225 to rise synchronously. During the rise, the inclined surface of the wedge 31 contacts the lower end of the first slider 222. Because the one-way mechanism 3 is locked, the wedge 31 cannot retract into the receiving groove 32. Therefore, although the inclined surface of the wedge 31 contacts the lower end of the first slider 222, the inclined surface of the wedge 31 will also push the first slider 222 to rise synchronously, instead of retracting into the inner wall of the receiving groove 32. Thus, in this embodiment, the one-way mechanism 3 not only restricts the one-way movement of the first slider 222, but also overcomes the wedge-shaped fit with the first slider 222 during its own rise and drives the first slider 222 to rise synchronously. As the first slider 222 rises, the lower end of the elastic sheet 23 rises synchronously with the first slider 222, thereby achieving the effect of temporarily fixing the detection rod 1 in the well by the stabilizer 2.

[0042] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pulsed neutron dynamic saturation elemental monitor, comprising a detection rod (1), wherein a centralizer (2) is sleeved on the detection rod (1), characterized in that, The stabilizer (2) includes a first ring (21), a second ring (22) and an elastic plate (23). The first ring (21) and the second ring (22) are both sleeved on the outer wall of the detection rod (1). The upper end of the elastic plate (23) is connected to the first ring (21), and the lower end is slidably connected to the second ring (22).

2. The pulsed neutron dynamic saturation element monitor according to claim 1, characterized in that, The outer wall of the second ring (22) is provided with a first sliding groove (221), and a first slider (222) is provided in the first sliding groove (221). The first slider (222) and the first sliding groove (221) form a sliding guide fit, and the lower end of the elastic sheet (23) is connected to the first slider (222).

3. The pulsed neutron dynamic saturation element monitor according to claim 2, characterized in that, The first slide (221) is provided with a one-way mechanism (3), which cooperates with the first slider (222) to limit its reset and rise after the first slider (222) descends.

4. The pulsed neutron dynamic saturation element monitor according to claim 3, characterized in that, The one-way mechanism (3) includes a wedge (31) and a spring (33). A receiving groove (32) is radially opened in the first sliding groove (221). The wedge (31) is inside the receiving groove (32) and forms a sliding guide fit with the receiving groove (32). The wedge (31) is dynamically sealed to the groove wall of the receiving groove (32). One end of the spring (33) is connected to the wedge (31), and the other end is connected to the groove wall of the receiving groove (32).

5. The pulsed neutron dynamic saturation element monitor according to claim 2, characterized in that, The first slider (222) has a groove (223) on one side near the central axis of the second ring (22). The first slider (222) is initially located above the wedge (31) and is spaced apart from the wedge (31).

6. The pulsed neutron dynamic saturation element monitor according to claim 4, characterized in that, The second ring (22) is slidably connected to the detection rod (1). The detection rod (1) is equipped with a drive assembly (17). The drive assembly (17) is used to drive the second ring (22) to move vertically up and down on the detection rod (1). A limiting groove (227) is opened on the inner wall of the second ring (22). One end of the second slider 14 is located in the limiting groove (227) and forms a limiting abutment with the limiting groove (227).

7. The pulsed neutron dynamic saturation element monitor according to claim 6, characterized in that, The outer wall of the detection rod (1) is provided with a second sliding groove (15), and a second slider (14) is installed in the second sliding groove (15). The second slider (14) and the second sliding groove (15) form a sliding guide fit. The inside of the detection rod (1) is provided with a sealing plate (16). One end of the second slider (14) is connected to the sealing plate (16). The sealing plate (16) is dynamically sealed to the inner wall of the detection rod (1). The drive assembly (17) is connected to the sealing plate (16) and is fixedly installed on the inner wall of the detection rod (1).

8. The pulsed neutron dynamic saturation element monitor according to claim 6, characterized in that, The second ring (22) includes an inner ring (224) and an outer ring (225), with the inner ring (224) used to lock the one-way mechanism (3) during the ascent.

9. The pulsed neutron dynamic saturation element monitor according to claim 8, characterized in that, A limiting groove (227) is formed on the outer wall of the inner ring (224). The inner ring (224) is slidably connected to the outer ring (225). The first slider (222) and the first sliding groove (221) are located on the outer ring (225). A through hole (226) is formed inside the inner ring (224). The through hole (226) corresponds to the receiving groove (32). The wedge (31) is dynamically sealed to the groove wall of the receiving groove (32).

10. The pulsed neutron dynamic saturation element monitor according to claim 8, characterized in that, The inner wall of the outer ring (225) is provided with a guide groove (228), and the inner ring (224) is provided with a guide block (229) on one side wall near the outer ring (225). One end of the guide block (229) is located in the guide groove (228) and forms a sliding guide fit with the guide groove (228).

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