Detection equipment for electromagnetic flaw detection of inner wall of oil casing

Abstract

The invention discloses detection equipment for electromagnetic flaw detection of the inner wall of an oil casing, which belongs to the technical field of electromagnetic flaw detection and comprises a base, a probe, a plurality of moving components and a plurality of scraping strips, in the oil and gas exploitation process, oil and gas can pass through the gap between the base and the inner wall of the oil casing, a wellhead does not need to be shut down, and it is ensured that flaw detection operation of the oil casing can be conducted in the normal use process of the oil casing. The base is driven by the moving assembly to move along the inner wall of the oil casing, the multiple scraping strips are matched with one another in the moving process, adhesion layers such as scales, wax and corrosion products adhering to the inner wall of the oil casing are scraped off, then the probe conducts flaw detection, the working process of scraping off the adhesion layers first and then conducting flaw detection is achieved, and therefore the situation that due to the adhesion layers, the damage to the inner wall of the oil casing is caused can be avoided. And the signal transmission and reception of the probe are blocked.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic flaw detection, and particularly relates to a detection device for electromagnetic flaw detection of the inner wall of oil casing pipes. Background Art

[0002] During the process of oil and gas extraction, as a key component connecting the ground and the oil layer, the integrity and sealing performance of the oil casing pipe directly affect the safety and continuity of oil and gas extraction. In order to ensure the working state of the oil casing pipe, it is necessary to conduct regular non-destructive testing to identify possible cracks, corrosion or other structural defects. Currently, the widely used electromagnetic flaw detection technology is used for defect detection of oil casing pipes due to its advantages of non-contact and high sensitivity.

[0003] However, after long-term use of the oil casing pipe, a fouling, wax and corrosion product adhesion layer will be formed, which blocks the effective electromagnetic coupling between the probe and the metal body; secondly, the high-speed flowing multiphase fluid (oil, gas, water, solid) inside the pipe will distort the electromagnetic field distribution and submerge the defect signal; this results in a significant limitation commonly existing in the flaw detection equipment in the prior art, that is, the flaw detection operation can only be carried out before the oil casing pipe is put into use or after the extraction stops. Summary of the Invention

[0004] The purpose of the present invention is to provide a detection device for electromagnetic flaw detection of the inner wall of oil casing pipes, so as to solve the problem that the detection equipment in the prior art can only carry out the flaw detection operation before the oil casing pipe is put into use or after the extraction stops.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A detection device for electromagnetic flaw detection of the inner wall of oil casing pipes, comprising: A base, with a gap for oil and gas to flow between it and the inner wall of the oil casing pipe; A probe, arranged at one end of the base for electromagnetic flaw detection; A plurality of moving components, evenly distributed along the circumferential side of the base and driving the base to move; A plurality of scraping strips, evenly arranged along the circumferential side of the base and in sliding contact with the inner wall of the oil casing pipe.

[0006] A further technical solution is that the plurality of moving components are arranged in a circular array centered on the axis of the oil casing pipe; A plurality of fixing grooves are formed on the circumferential side of the base; Each moving component is arranged in a fixing groove and includes: An outer pressing member; A moving member, pushed by the outer pressing member to contact the inner wall of the oil casing pipe.

[0007] A further technical solution is that the moving member includes: A moving bar, one end of which is rotatably connected to a fixed groove with the axis perpendicular to the axis of the oil casing; A first roller, provided at the other end of the moving bar; A power component, driving the first roller to rotate.

[0008] A further technical solution is that the outer abutting member has: A telescopic outer abutting shaft, the free end of which is hinged to the moving bar; One end of the outer abutting member away from the outer abutting shaft is hinged in the fixed groove; when the outer abutting shaft extends, it pushes the moving bar to rotate so that the first roller contacts the inner wall of the oil casing.

[0009] A further technical solution is that balance members are uniformly arranged along the radial direction on the circumferential side of the base, and they include: A telescopic balance shaft; A second roller, provided at the free end of the balance shaft and contacting the inner wall of the oil casing.

[0010] A further technical solution is that a diversion block is provided at one end of the base away from the probe.

[0011] A further technical solution is that a toothed ring is rotatably arranged between the diversion block and the base, and it is coaxial with the oil casing; A semi-gear is rotatably arranged at one end of the base close to the diversion block, which is located inside the toothed ring and is in meshing transmission with the toothed ring through gears; A plurality of the scraping strips are uniformly distributed along the circumferential side of the toothed ring.

[0012] A further technical solution is that radially arranged protruding members are uniformly arranged on the circumferential side of the toothed ring, and they include: A telescopic protruding shaft; The scraping strip is connected to the free end of the protruding shaft; A detection groove is formed on the side of the scraping strip close to the probe, and pressure sensors are uniformly arranged in the detection groove.

[0013] A further technical solution is that the diversion block is a hemispherical structure facing away from the probe; A chute coaxial with the oil casing is formed at the vertex of the diversion block; A sliding rod is slidably arranged in the chute through a spring; a diversion ball is arranged at the outer end of the sliding rod.

[0014] A further technical solution is that a scraping ring is slidably arranged on the outer side wall of the probe; A retaining ring groove is formed on one side of the base close to the scraping ring for the scraping ring to be slidably connected; A telescopic member arranged along the axis of the oil casing is arranged in the retaining ring groove, and the free end of its telescopic shaft is connected to the scraping ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: During the oil and gas extraction process, the oil and gas can pass through the gap between the base and the inner wall of the oil casing without shutting down the wellhead, ensuring that flaw detection of the oil casing can be carried out during the normal use of the oil casing. The moving component drives the base to move along the inner wall of the oil casing. During the movement, multiple scraping strips cooperate with each other to scrape off the adhering layers such as scale, wax, and corrosion products on the inner wall of the oil casing. Then, the probe performs flaw detection, realizing the working process of scraping off the adhering layer first and then performing flaw detection. This can avoid blocking the signal transmission and reception of the probe due to the adhering layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a longitudinal sectional view of the application state of the detection device of the present invention.

[0017] Figure 2 It is a top view of the application state of the detection device of the present invention.

[0018] Figure 3 It is a three-dimensional view of the detection device of the present invention.

[0019] Figure 4 It is a three-dimensional view of the moving component of the present invention.

[0020] Figure 5 It is a three-dimensional view of the partial structure of the detection device of the present invention.

[0021] Figure 6 It is a three-dimensional view of the base of the present invention.

[0022] Figure 7 It is a three-dimensional view of the structure on the scraping strip of the present invention.

[0023] Figure 8 It is a three-dimensional view of the scraping ring of the present invention.

[0024] Reference numerals: 1 - base, 2 - oil casing, 3 - gap, 4 - probe, 5 - moving component, 6 - fixing groove, 7 - moving bar, 8 - rotating shaft, 9 - first roller, 10 - power component, 11 - outer abutting shaft, 12 - balancing component, 13 - second roller, 14 - guiding block, 15 - toothed ring, 16 - limiting ring, 17 - limiting groove, 18 - rotating motor, 19 - semi-gear, 20 - extending component, 21 - detection groove, 22 - pressure sensor, 23 - sliding rod, 24 - scraping ring, 25 - retaining ring groove, 26 - telescopic component, 27 - scraping strip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Embodiment: As Figures 1 to 8 shown, the present invention provides a detection device for electromagnetic flaw detection of the inner wall of oil casing pipes, including a cylindrical base 1; there is a gap 3 between the base 1 and the inner wall of the oil casing pipe 2, which allows oil and gas to pass through during oil and gas exploitation to ensure normal exploitation; one end of the base 1 is provided with a probe 4 for flaw detection of the oil casing pipe 2; the probe 4 cooperates with a multi-frequency eddy current detector to perform flaw detection on the oil pipe sleeve; a plurality of moving components 5 (four are taken as examples in this embodiment) are evenly arranged on the periphery of the base 1; the base 1 moves along the inner wall of the oil casing pipe 2 through the moving components 5; a plurality of scraping strips 27 (four are taken as examples in this embodiment) are evenly arranged on the periphery of the base 1; the plurality of scraping strips 27 are arranged in a circular array around the axis of the oil casing pipe 2 on the periphery of the base 1; the scraping strips 27 are in sliding contact with the inner wall of the oil casing pipe 2.

[0027] Principle and beneficial effects of the above technical solution: During oil and gas exploitation, oil and gas can pass through the gap 3 between the base 1 and the inner wall of the oil casing pipe 2, without shutting down the wellhead, ensuring that flaw detection operations of the oil casing pipe 2 can be carried out during the normal use of the oil casing pipe 2. The moving components 5 drive the base 1 to move along the inner wall of the oil casing pipe 2. During the movement, the plurality of scraping strips 27 cooperate with each other to scrape off the adherent layers such as scale, wax and corrosion products adhering to the inner wall of the oil casing pipe 2. Then the probe 4 performs flaw detection, realizing the working process of first scraping off the adherent layer and then performing flaw detection. This can avoid blocking the signal transmission and reception of the probe 4 due to the adherent layer.

[0028] In this embodiment, a plurality of moving components 5 are arranged in a circular array around the axis of the oil casing pipe 2 on the periphery of the base 1; a number of fixing grooves 6 are opened on the periphery of the base 1; each moving component 5 is arranged in a corresponding fixing groove 6; each moving component 5 includes an outer pressing member and a moving member; the outer pressing member is located in the fixing groove 6 and is used to push the moving member into contact with the inner wall of the oil casing pipe 2.

[0029] Principle and beneficial effects of the above technical solution: By the outer pressing member pushing the moving member outwards, it can ensure that the moving member moves stably in close contact with the inner wall of the oil casing pipe 2, effectively avoiding poor contact or fitting deviation.

[0030] In this embodiment, the moving part includes a moving bar 7; one end of the moving bar 7 is rotatably arranged in the fixed groove 6 with the axis perpendicular to the axis of the oil casing 2; a rotating shaft 8 is rotatably arranged in the fixed groove 6; the rotating shaft 8 is arranged along the direction perpendicular to the axis of the oil casing 2; the moving bar 7 is rotatably sleeved on the rotating shaft 8 through a rotating hole opened; the other end of the moving bar 7 is provided with a first roller 9 and a power member 10 for driving the first roller 9 to rotate; the power member 10 is a servo motor.

[0031] Principle and beneficial effects of the above technical solution: The first roller 9 is driven by a servo motor to achieve active rotation, which not only enhances the fitting and relative sliding control between the roller and the inner wall of the oil casing 2, but also can accurately adjust the rolling speed and pressure, improving the sensitivity and stability of the equipment during operation.

[0032] In this embodiment, the outer pressing member has a telescopic outer pressing shaft 11; the free end of the outer pressing shaft 11 is hinged to the moving bar 7; one end of the outer pressing member away from the outer pressing shaft 11 is hinged in the fixed groove 6; the outer pressing shaft 11 extends, thereby driving the moving bar 7 to rotate, so that the first roller 9 contacts the inner wall of the oil casing 2; the outer pressing member is an electric cylinder.

[0033] Principle and beneficial effects of the above technical solution: By controlling the extension or retraction of the outer pressing shaft 11, the moving bar 7 can be driven to rotate around the rotating shaft 8, so that the first roller 9 at the end of the moving bar 7 expands and retracts in the radial direction, ensuring that the first roller 9 always stably contacts the inner wall.

[0034] In this embodiment, a balance member 12 is evenly arranged along the radial direction on the circumference of the base 1 in a circular array; the balance member 12 is an electric cylinder; the balance member 12 has a telescopic balance shaft; a second roller 13 is provided at the free end of the balance shaft; the second roller 13 contacts the inner wall of the tubing sleeve.

[0035] Principle and beneficial effects of the above technical solution: By controlling the extension or retraction of the balance shaft of the balance member 12, the second roller 13 can be made to contact the inner wall of the oil casing 2. The cooperation of multiple balance members 12 can play a role in supporting and limiting, effectively suppressing the radial shaking or deviation of the flaw detection equipment during operation, and can also dynamically adjust the contact pressure to adapt to the local tolerance fluctuation of the inner wall of the oil casing 2, thereby improving the balance and stability of the equipment operation. Through the coordinated action of multiple balance members 12, the reliability of the equipment during long-term operation in a harsh downhole environment and the consistency of flaw detection signals are further enhanced.

[0036] In this embodiment, a diversion block 14 is provided at one end of the base 1 away from the probe 4.

[0037] Principle and beneficial effects of the above technical solution: The flow guiding block 14 can reduce resistance, guide downhole fluids (such as crude oil, mud or well fluid) to flow in a set direction, reduce the fluid resistance and disturbance suffered by the equipment when operating in the wellbore, thereby improving the running-in efficiency and operation stability of the equipment; in addition, the flow guiding block 14 can also prevent impurities and sediment from impacting the probe 4 area to a certain extent, effectively extending the service life of the probe 4 and ensuring the stability and accuracy of the flaw detection signal.

[0038] In this embodiment, a tooth ring 15 coaxial with the oil casing 2 is rotatably arranged between the flow guiding block 14 and the base 1; limiting rings 16 coaxial are arranged on both sides of the tooth ring 15; annular limiting grooves 17 are formed in the corresponding side walls of the flow guiding block 14 and the base 1; the limiting rings 16 are rotatably arranged in the corresponding limiting grooves 17; a rotating groove is formed at one end of the base 1 close to the flow guiding block 14; a rotating motor 18 is arranged in the rotating groove; a half gear 19 located inside the tooth ring 15 is rotatably arranged at the power end of the rotating motor 18; the half gear 19 is connected with the tooth ring 15 through gears; a plurality of scraping strips 27 are uniformly arranged on the circumferential side of the tooth ring 15.

[0039] Principle and beneficial effects of the above technical solution: By driving the half gear 19 by the rotating motor 18, the tooth ring 15 can be intermittently rotated through gears, and then a plurality of scraping strips 27 uniformly distributed on the circumferential side of the tooth ring 15 are driven to rotate around the axis of the oil casing 2, so as to continuously scrape and clean the inner wall of the oil casing 2, increasing the working area of the scraping strips 27.

[0040] The gear connection between the half gear 19 and the tooth ring 15 is an intermittent meshing structure. When the gear completes one round of rotation and re-enters the meshing area, a short secondary contact impact will occur. This vibration is transmitted to the scraping strips 27 uniformly arranged on the circumferential side of the tooth ring 15 through the tooth ring 15, so that the scraping strips 27 generate micro-amplitude oscillation or bounce, effectively overcoming the adhesion force between the attached substances and the scraping strips 27, and shaking off foreign substances such as sediment and oil scale attached to the surface of the scraping strips 27, avoiding the decline of cleaning efficiency or the blockage of the scraping strips 27.

[0041] In this embodiment, extending members 20 arranged radially are uniformly arranged on the circumferential side of the tooth ring 15; the extending members 20 are electric cylinders; the extending members 20 have a telescopic extending shaft; the scraping strips 27 are connected with the corresponding extending shafts; a detection groove 21 is formed on the side of the scraping strip 27 close to the electromagnetic flaw detection member; pressure sensors 22 in contact with the inner wall of the oil casing 2 are uniformly arranged in the detection groove 21.

[0042] Principle and beneficial effects of the above technical solution: After the scraping strip 27 scrapes the attachments on the inner wall of the oil casing 2, the pressure sensor 22 can feedback the pressure on the inner wall of the oil casing 2. Since multiple scraping strips 27 are evenly distributed on the circumferential side of the tooth ring 15, the pressure sensors 22 on each scraping strip 27 form a distributed array, which can synchronously collect the contact pressure data at different positions of the oil casing 2, thereby establishing an inner wall stress distribution map to assist in judging local abnormal areas, and being able to judge whether the oil casing 2 has the possibility of cracking through the numerical change of stress. When microcracks or deformations occur locally in the oil casing 2, the stiffness and contact characteristics of this area will be different from those of the surrounding areas, and the pressure sensor 22 can be reflected as abnormal stress fluctuations. Through data fusion and analysis, the system can identify potential cracks or weakened areas to achieve early warning.

[0043] The contact information provided by the pressure sensor 22 can be used as an auxiliary judgment basis for the working state of the electromagnetic flaw detection probe 4. When the flaw detection signal is abnormal in a certain area and the pressure sensor 22 synchronously feedbacks the stress change, the accuracy of fault identification can be improved, and false alarms and missed alarms caused by poor contact or errors can be avoided.

[0044] In this embodiment, the diversion block 14 is a hemispherical structure arranged away from the electromagnetic detection part; a chute coaxial with the axis of the oil casing 2 is opened at the vertex of the diversion block 14; a sliding rod 23 is slidably arranged in the chute through a spring; a diversion ball is arranged at the outer end of the sliding rod 23.

[0045] The principle and beneficial effects of the above technical solution: The diversion ball can axially adjust its position in the chute as a sliding part, which can adapt to different flow rates and pressure conditions, and play a role in separating and redirecting the oil and gas flow. Combining the wrapping and curved surface guiding characteristics of the hemispherical diversion block 14, the oil and gas are effectively shunted and concentratedly guided to the area where the scraping strip 27 is located.

[0046] Through the flow field control of the diversion ball, a strong local scouring effect is formed when the oil and gas flow through the area of the scraping strip 27, which helps to wash and peel off impurities such as oil sludge and sand grains attached to the scraping strip 27, improve the cleaning ability of the scraping strip 27 and maintain its working efficiency.

[0047] The synergistic effect of the diversion ball and the hemispherical structure not only reduces the interference of fluid disturbance to the detection path of the probe 4, but also avoids signal interference by guiding the oil and gas around the electromagnetic flaw detection part, improves the stability of the electromagnetic wave propagation path, and enhances the accuracy of the flaw detection result.

[0048] In this embodiment, a scraping ring 24 is slidably arranged on the outer side wall of the probe 4; a retaining ring groove 25 for the scraping ring 24 to slidably connect is opened on one side of the base 1 close to the scraping ring 24; a telescopic member 26 arranged along the axis of the oil casing 2 is arranged in the retaining ring groove 25; the telescopic member 26 is an electric cylinder; the telescopic member 26 has a telescopic shaft; the scraping ring 24 is connected to the free end of the telescopic shaft.

[0049] Principle and beneficial effects of the above technical solution: The scraping ring 24 actively cleans the outer wall of the probe 4 under the drive of the electric cylinder, effectively removing oil stains, impurities or bubbles that may adhere to the surface of the probe 4 during the upward movement of oil and gas, preventing stray objects from interfering with the electromagnetic signal transmission and reception paths, and improving the flaw detection accuracy and data quality from the source.

[0050] Although the present invention has been described herein with reference to a number of illustrative embodiments of the invention, it should be understood that those skilled in the art can devise many other modifications and embodiments that will fall within the scope of the principles of this application disclosure and spirit. More specifically, within the scope of this application disclosure, the drawings and the claims, various variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A detection device for electromagnetic flaw detection of the inner wall of oil casing pipes, characterized in that, Comprising: A base, with a gap for oil and gas to flow between it and the inner wall of the oil casing; A probe, provided at one end of the base for electromagnetic flaw detection; A plurality of moving components, evenly distributed along the circumferential side of the base and driving the base to move; A plurality of scraping bars, evenly arranged along the circumferential side of the base and in sliding contact with the inner wall of the oil casing.

2. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 1, characterized in that: The plurality of moving components are arranged in a circular array centered on the axis of the oil casing; A number of fixing grooves are formed on the circumferential side of the base; Each moving component is arranged in a fixing groove and includes: An outer pressing member; A moving member, pushed by the outer pressing member to contact the inner wall of the oil casing.

3. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 2, characterized in that: The moving member includes: A moving bar, one end of which is rotatably connected to the fixing groove with the direction perpendicular to the axis of the oil casing as the axis; A first roller, provided at the other end of the moving bar; A power member, driving the first roller to rotate.

4. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 3, characterized in that: The outer pressing member has: A telescopic outer pressing shaft, the free end of which is hinged to the moving bar; One end of the outer pressing member away from the outer pressing shaft is hinged in the fixing groove; when the outer pressing shaft extends, it pushes the moving bar to rotate so that the first roller contacts the inner wall of the oil casing.

5. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 1, characterized in that: Balancing members are evenly arranged along the radial direction on the circumferential side of the base, and each balancing member includes: A telescopic balancing shaft; A second roller, provided at the free end of the balancing shaft and in contact with the inner wall of the oil casing.

6. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 1, characterized in that: A flow guiding block is provided at one end of the base away from the probe.

7. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 6, characterized in that: A toothed ring is rotatably arranged between the flow guiding block and the base, and it is coaxial with the oil casing; A semi-gear is rotatably arranged at one end of the base close to the flow guiding block, which is located inside the toothed ring and is in meshing transmission with the toothed ring through gears; The plurality of scraping bars are evenly distributed along the circumferential side of the toothed ring.

8. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 7, characterized in that: Radially arranged protruding members are evenly arranged on the circumferential side of the toothed ring, and each protruding member includes: A telescopic protruding shaft; The scraping bar is connected to the free end of the protruding shaft; A detection groove is formed on the side of the scraping bar close to the probe, and pressure sensors are evenly arranged in the detection groove.

9. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 6, characterized in that: The flow guiding block is a hemispherical structure facing away from the probe; A chute coaxial with the oil casing is formed at the vertex of the flow guiding block; A sliding rod is slidably arranged in the chute through a spring; a flow guiding ball is provided at the outer end of the sliding rod.

10. The detection device for electromagnetic flaw detection of the inner wall of an oil casing according to claim 1, characterized in that: A scraping ring is slidably arranged on the outer side wall of the probe; A retaining ring groove is formed on one side of the base close to the scraping ring for the scraping ring to be slidably connected thereto. A telescopic member arranged along the axis of the oil casing pipe is provided in the retaining ring groove, and the free end of its telescopic shaft is connected to the scraping ring.

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